diff --git a/ci/test/06_script_b.sh b/ci/test/06_script_b.sh
index 1220b15d5a2..3c02909212d 100755
--- a/ci/test/06_script_b.sh
+++ b/ci/test/06_script_b.sh
@@ -45,6 +45,7 @@ if [ "${RUN_TIDY}" = "true" ]; then
           " src/init"\
           " src/kernel"\
           " src/node/chainstate.cpp"\
+          " src/node/mempool_args.cpp"\
           " src/policy/feerate.cpp"\
           " src/policy/packages.cpp"\
           " src/policy/settings.cpp"\
diff --git a/doc/policy/README.md b/doc/policy/README.md
index 6e8686365dc..27536407e7d 100644
--- a/doc/policy/README.md
+++ b/doc/policy/README.md
@@ -3,7 +3,7 @@
 **Policy** (Mempool or Transaction Relay Policy) is the node's set of validation rules, in addition
 to consensus, enforced for unconfirmed transactions before submitting them to the mempool. These
 rules are local to the node and configurable (e.g. `-minrelaytxfee`, `-limitancestorsize`,
-`-incrementalRelayFee`). Policy may include restrictions on the transaction itself, the transaction
+`-incrementalrelayfee`). Policy may include restrictions on the transaction itself, the transaction
 in relation to the current chain tip, and the transaction in relation to the node's mempool
 contents. Policy is *not* applied to transactions in blocks.
 
diff --git a/doc/policy/mempool-replacements.md b/doc/policy/mempool-replacements.md
index 430a96f228c..b3c4239b731 100644
--- a/doc/policy/mempool-replacements.md
+++ b/doc/policy/mempool-replacements.md
@@ -71,7 +71,7 @@ This set of rules is similar but distinct from BIP125.
   Bitcoin Core implementation.
 
 * The incremental relay feerate used to calculate the required additional fees is distinct from
-  `minRelayTxFee` and configurable using `-incrementalrelayfee`
+  `-minrelaytxfee` and configurable using `-incrementalrelayfee`
   ([PR #9380](https://github.com/bitcoin/bitcoin/pull/9380)).
 
 * RBF enabled by default in the wallet GUI as of **v0.18.1** ([PR
diff --git a/doc/policy/packages.md b/doc/policy/packages.md
index f2a3d6517ef..03c26da86be 100644
--- a/doc/policy/packages.md
+++ b/doc/policy/packages.md
@@ -81,7 +81,7 @@ If any transactions in the package are already in the mempool, they are not subm
 ("deduplicated") and are thus excluded from this calculation.
 
 To meet the two feerate requirements of a mempool, i.e., the pre-configured minimum relay feerate
-(`minRelayTxFee`) and the dynamic mempool minimum feerate, the total package feerate is used instead
+(`-minrelaytxfee`) and the dynamic mempool minimum feerate, the total package feerate is used instead
 of the individual feerate. The individual transactions are allowed to be below the feerate
 requirements if the package meets the feerate requirements. For example, the parent(s) in the
 package can pay no fees but be paid for by the child.
diff --git a/src/Makefile.am b/src/Makefile.am
index 23bc1800953..22390ef2bf5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -139,7 +139,6 @@ BITCOIN_CORE_H = \
   compat/cpuid.h \
   compat/endian.h \
   compressor.h \
-  node/connection_types.h \
   consensus/consensus.h \
   consensus/tx_check.h \
   consensus/tx_verify.h \
@@ -149,7 +148,6 @@ BITCOIN_CORE_H = \
   dbwrapper.h \
   deploymentinfo.h \
   deploymentstatus.h \
-  node/eviction.h \
   external_signer.h \
   flatfile.h \
   fs.h \
@@ -184,7 +182,6 @@ BITCOIN_CORE_H = \
   logging.h \
   logging/timer.h \
   mapport.h \
-  mempool_args.h \
   memusage.h \
   merkleblock.h \
   net.h \
@@ -199,13 +196,16 @@ BITCOIN_CORE_H = \
   node/caches.h \
   node/chainstate.h \
   node/coin.h \
+  node/connection_types.h \
   node/context.h \
+  node/eviction.h \
+  node/interface_ui.h \
+  node/mempool_args.h \
   node/mempool_persist_args.h \
   node/miner.h \
   node/minisketchwrapper.h \
   node/psbt.h \
   node/transaction.h \
-  node/interface_ui.h \
   node/utxo_snapshot.h \
   noui.h \
   outputtype.h \
@@ -372,10 +372,9 @@ libbitcoin_node_a_SOURCES = \
   kernel/context.cpp \
   kernel/mempool_persist.cpp \
   mapport.cpp \
-  mempool_args.cpp \
   net.cpp \
-  netgroup.cpp \
   net_processing.cpp \
+  netgroup.cpp \
   node/blockstorage.cpp \
   node/caches.cpp \
   node/chainstate.cpp \
@@ -383,13 +382,14 @@ libbitcoin_node_a_SOURCES = \
   node/connection_types.cpp \
   node/context.cpp \
   node/eviction.cpp \
+  node/interface_ui.cpp \
   node/interfaces.cpp \
+  node/mempool_args.cpp \
   node/mempool_persist_args.cpp \
   node/miner.cpp \
   node/minisketchwrapper.cpp \
   node/psbt.cpp \
   node/transaction.cpp \
-  node/interface_ui.cpp \
   noui.cpp \
   policy/fees.cpp \
   policy/fees_args.cpp \
@@ -402,8 +402,8 @@ libbitcoin_node_a_SOURCES = \
   rpc/fees.cpp \
   rpc/mempool.cpp \
   rpc/mining.cpp \
-  rpc/node.cpp \
   rpc/net.cpp \
+  rpc/node.cpp \
   rpc/output_script.cpp \
   rpc/rawtransaction.cpp \
   rpc/server.cpp \
diff --git a/src/init.cpp b/src/init.cpp
index a94bbe6460e..e3d13ad972a 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -31,7 +31,6 @@
 #include <interfaces/init.h>
 #include <interfaces/node.h>
 #include <mapport.h>
-#include <mempool_args.h>
 #include <net.h>
 #include <net_permissions.h>
 #include <net_processing.h>
@@ -42,6 +41,7 @@
 #include <node/chainstate.h>
 #include <node/context.h>
 #include <node/interface_ui.h>
+#include <node/mempool_args.h>
 #include <node/mempool_persist_args.h>
 #include <node/miner.h>
 #include <policy/feerate.h>
@@ -935,16 +935,6 @@ bool AppInitParameterInteraction(const ArgsManager& args, bool use_syscall_sandb
         LogPrintf("Warning: nMinimumChainWork set below default value of %s\n", chainparams.GetConsensus().nMinimumChainWork.GetHex());
     }
 
-    // incremental relay fee sets the minimum feerate increase necessary for BIP 125 replacement in the mempool
-    // and the amount the mempool min fee increases above the feerate of txs evicted due to mempool limiting.
-    if (args.IsArgSet("-incrementalrelayfee")) {
-        if (std::optional<CAmount> inc_relay_fee = ParseMoney(args.GetArg("-incrementalrelayfee", ""))) {
-            ::incrementalRelayFee = CFeeRate{inc_relay_fee.value()};
-        } else {
-            return InitError(AmountErrMsg("incrementalrelayfee", args.GetArg("-incrementalrelayfee", "")));
-        }
-    }
-
     // block pruning; get the amount of disk space (in MiB) to allot for block & undo files
     int64_t nPruneArg = args.GetIntArg("-prune", 0);
     if (nPruneArg < 0) {
@@ -973,19 +963,6 @@ bool AppInitParameterInteraction(const ArgsManager& args, bool use_syscall_sandb
         return InitError(Untranslated("peertimeout must be a positive integer."));
     }
 
-    if (args.IsArgSet("-minrelaytxfee")) {
-        if (std::optional<CAmount> min_relay_fee = ParseMoney(args.GetArg("-minrelaytxfee", ""))) {
-            // High fee check is done afterward in CWallet::Create()
-            ::minRelayTxFee = CFeeRate{min_relay_fee.value()};
-        } else {
-            return InitError(AmountErrMsg("minrelaytxfee", args.GetArg("-minrelaytxfee", "")));
-        }
-    } else if (incrementalRelayFee > ::minRelayTxFee) {
-        // Allow only setting incrementalRelayFee to control both
-        ::minRelayTxFee = incrementalRelayFee;
-        LogPrintf("Increasing minrelaytxfee to %s to match incrementalrelayfee\n",::minRelayTxFee.ToString());
-    }
-
     // Sanity check argument for min fee for including tx in block
     // TODO: Harmonize which arguments need sanity checking and where that happens
     if (args.IsArgSet("-blockmintxfee")) {
@@ -994,28 +971,10 @@ bool AppInitParameterInteraction(const ArgsManager& args, bool use_syscall_sandb
         }
     }
 
-    // Feerate used to define dust.  Shouldn't be changed lightly as old
-    // implementations may inadvertently create non-standard transactions
-    if (args.IsArgSet("-dustrelayfee")) {
-        if (std::optional<CAmount> parsed = ParseMoney(args.GetArg("-dustrelayfee", ""))) {
-            dustRelayFee = CFeeRate{parsed.value()};
-        } else {
-            return InitError(AmountErrMsg("dustrelayfee", args.GetArg("-dustrelayfee", "")));
-        }
-    }
-
-    fRequireStandard = !args.GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
-    if (!chainparams.IsTestChain() && !fRequireStandard) {
-        return InitError(strprintf(Untranslated("acceptnonstdtxn is not currently supported for %s chain"), chainparams.NetworkIDString()));
-    }
     nBytesPerSigOp = args.GetIntArg("-bytespersigop", nBytesPerSigOp);
 
     if (!g_wallet_init_interface.ParameterInteraction()) return false;
 
-    fIsBareMultisigStd = args.GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
-    fAcceptDatacarrier = args.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
-    nMaxDatacarrierBytes = args.GetIntArg("-datacarriersize", nMaxDatacarrierBytes);
-
     // Option to startup with mocktime set (used for regression testing):
     SetMockTime(args.GetIntArg("-mocktime", 0)); // SetMockTime(0) is a no-op
 
@@ -1418,7 +1377,9 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         .estimator = node.fee_estimator.get(),
         .check_ratio = chainparams.DefaultConsistencyChecks() ? 1 : 0,
     };
-    ApplyArgsManOptions(args, mempool_opts);
+    if (const auto err{ApplyArgsManOptions(args, chainparams, mempool_opts)}) {
+        return InitError(*err);
+    }
     mempool_opts.check_ratio = std::clamp<int>(mempool_opts.check_ratio, 0, 1'000'000);
 
     int64_t descendant_limit_bytes = mempool_opts.limits.descendant_size_vbytes * 40;
diff --git a/src/kernel/mempool_options.h b/src/kernel/mempool_options.h
index 07953b443bc..dad6f14c391 100644
--- a/src/kernel/mempool_options.h
+++ b/src/kernel/mempool_options.h
@@ -6,8 +6,13 @@
 
 #include <kernel/mempool_limits.h>
 
+#include <policy/feerate.h>
+#include <policy/policy.h>
+#include <script/standard.h>
+
 #include <chrono>
 #include <cstdint>
+#include <optional>
 
 class CBlockPolicyEstimator;
 
@@ -33,6 +38,20 @@ struct MemPoolOptions {
     int check_ratio{0};
     int64_t max_size_bytes{DEFAULT_MAX_MEMPOOL_SIZE_MB * 1'000'000};
     std::chrono::seconds expiry{std::chrono::hours{DEFAULT_MEMPOOL_EXPIRY_HOURS}};
+    CFeeRate incremental_relay_feerate{DEFAULT_INCREMENTAL_RELAY_FEE};
+    /** A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation) */
+    CFeeRate min_relay_feerate{DEFAULT_MIN_RELAY_TX_FEE};
+    CFeeRate dust_relay_feerate{DUST_RELAY_TX_FEE};
+    /**
+     * A data carrying output is an unspendable output containing data. The script
+     * type is designated as TxoutType::NULL_DATA.
+     *
+     * Maximum size of TxoutType::NULL_DATA scripts that this node considers standard.
+     * If nullopt, any size is nonstandard.
+     */
+    std::optional<unsigned> max_datacarrier_bytes{DEFAULT_ACCEPT_DATACARRIER ? std::optional{MAX_OP_RETURN_RELAY} : std::nullopt};
+    bool permit_bare_multisig{DEFAULT_PERMIT_BAREMULTISIG};
+    bool require_standard{true};
     bool full_rbf{DEFAULT_MEMPOOL_FULL_RBF};
     MemPoolLimits limits{};
 };
diff --git a/src/mempool_args.cpp b/src/mempool_args.cpp
deleted file mode 100644
index 77caa127e96..00000000000
--- a/src/mempool_args.cpp
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright (c) 2022 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#include <mempool_args.h>
-
-#include <kernel/mempool_limits.h>
-#include <kernel/mempool_options.h>
-
-#include <util/system.h>
-
-using kernel::MemPoolLimits;
-using kernel::MemPoolOptions;
-
-namespace {
-void ApplyArgsManOptions(const ArgsManager& argsman, MemPoolLimits& mempool_limits)
-{
-    mempool_limits.ancestor_count = argsman.GetIntArg("-limitancestorcount", mempool_limits.ancestor_count);
-
-    if (auto vkb = argsman.GetIntArg("-limitancestorsize")) mempool_limits.ancestor_size_vbytes = *vkb * 1'000;
-
-    mempool_limits.descendant_count = argsman.GetIntArg("-limitdescendantcount", mempool_limits.descendant_count);
-
-    if (auto vkb = argsman.GetIntArg("-limitdescendantsize")) mempool_limits.descendant_size_vbytes = *vkb * 1'000;
-}
-}
-
-void ApplyArgsManOptions(const ArgsManager& argsman, MemPoolOptions& mempool_opts)
-{
-    mempool_opts.check_ratio = argsman.GetIntArg("-checkmempool", mempool_opts.check_ratio);
-
-    if (auto mb = argsman.GetIntArg("-maxmempool")) mempool_opts.max_size_bytes = *mb * 1'000'000;
-
-    if (auto hours = argsman.GetIntArg("-mempoolexpiry")) mempool_opts.expiry = std::chrono::hours{*hours};
-
-    mempool_opts.full_rbf = argsman.GetBoolArg("-mempoolfullrbf", mempool_opts.full_rbf);
-
-    ApplyArgsManOptions(argsman, mempool_opts.limits);
-}
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 0e10fa5f9d5..2e113905416 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -4759,8 +4759,8 @@ void PeerManagerImpl::MaybeSendFeefilter(CNode& pto, Peer& peer, std::chrono::mi
     }
     if (current_time > peer.m_next_send_feefilter) {
         CAmount filterToSend = g_filter_rounder.round(currentFilter);
-        // We always have a fee filter of at least minRelayTxFee
-        filterToSend = std::max(filterToSend, ::minRelayTxFee.GetFeePerK());
+        // We always have a fee filter of at least the min relay fee
+        filterToSend = std::max(filterToSend, m_mempool.m_min_relay_feerate.GetFeePerK());
         if (filterToSend != peer.m_fee_filter_sent) {
             m_connman.PushMessage(&pto, CNetMsgMaker(pto.GetCommonVersion()).Make(NetMsgType::FEEFILTER, filterToSend));
             peer.m_fee_filter_sent = filterToSend;
diff --git a/src/node/interfaces.cpp b/src/node/interfaces.cpp
index 699dca0a731..2c845d01274 100644
--- a/src/node/interfaces.cpp
+++ b/src/node/interfaces.cpp
@@ -301,7 +301,11 @@ public:
         }
     }
     bool getNetworkActive() override { return m_context->connman && m_context->connman->GetNetworkActive(); }
-    CFeeRate getDustRelayFee() override { return ::dustRelayFee; }
+    CFeeRate getDustRelayFee() override
+    {
+        if (!m_context->mempool) return CFeeRate{DUST_RELAY_TX_FEE};
+        return m_context->mempool->m_dust_relay_feerate;
+    }
     UniValue executeRpc(const std::string& command, const UniValue& params, const std::string& uri) override
     {
         JSONRPCRequest req;
@@ -676,9 +680,21 @@ public:
         if (!m_node.mempool) return {};
         return m_node.mempool->GetMinFee();
     }
-    CFeeRate relayMinFee() override { return ::minRelayTxFee; }
-    CFeeRate relayIncrementalFee() override { return ::incrementalRelayFee; }
-    CFeeRate relayDustFee() override { return ::dustRelayFee; }
+    CFeeRate relayMinFee() override
+    {
+        if (!m_node.mempool) return CFeeRate{DEFAULT_MIN_RELAY_TX_FEE};
+        return m_node.mempool->m_min_relay_feerate;
+    }
+    CFeeRate relayIncrementalFee() override
+    {
+        if (!m_node.mempool) return CFeeRate{DEFAULT_INCREMENTAL_RELAY_FEE};
+        return m_node.mempool->m_incremental_relay_feerate;
+    }
+    CFeeRate relayDustFee() override
+    {
+        if (!m_node.mempool) return CFeeRate{DUST_RELAY_TX_FEE};
+        return m_node.mempool->m_dust_relay_feerate;
+    }
     bool havePruned() override
     {
         LOCK(::cs_main);
diff --git a/src/node/mempool_args.cpp b/src/node/mempool_args.cpp
new file mode 100644
index 00000000000..60993f1d8df
--- /dev/null
+++ b/src/node/mempool_args.cpp
@@ -0,0 +1,99 @@
+// Copyright (c) 2022 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <node/mempool_args.h>
+
+#include <kernel/mempool_limits.h>
+#include <kernel/mempool_options.h>
+
+#include <chainparams.h>
+#include <consensus/amount.h>
+#include <logging.h>
+#include <policy/feerate.h>
+#include <policy/policy.h>
+#include <tinyformat.h>
+#include <util/error.h>
+#include <util/moneystr.h>
+#include <util/system.h>
+#include <util/translation.h>
+
+#include <chrono>
+#include <memory>
+
+using kernel::MemPoolLimits;
+using kernel::MemPoolOptions;
+
+namespace {
+void ApplyArgsManOptions(const ArgsManager& argsman, MemPoolLimits& mempool_limits)
+{
+    mempool_limits.ancestor_count = argsman.GetIntArg("-limitancestorcount", mempool_limits.ancestor_count);
+
+    if (auto vkb = argsman.GetIntArg("-limitancestorsize")) mempool_limits.ancestor_size_vbytes = *vkb * 1'000;
+
+    mempool_limits.descendant_count = argsman.GetIntArg("-limitdescendantcount", mempool_limits.descendant_count);
+
+    if (auto vkb = argsman.GetIntArg("-limitdescendantsize")) mempool_limits.descendant_size_vbytes = *vkb * 1'000;
+}
+}
+
+std::optional<bilingual_str> ApplyArgsManOptions(const ArgsManager& argsman, const CChainParams& chainparams, MemPoolOptions& mempool_opts)
+{
+    mempool_opts.check_ratio = argsman.GetIntArg("-checkmempool", mempool_opts.check_ratio);
+
+    if (auto mb = argsman.GetIntArg("-maxmempool")) mempool_opts.max_size_bytes = *mb * 1'000'000;
+
+    if (auto hours = argsman.GetIntArg("-mempoolexpiry")) mempool_opts.expiry = std::chrono::hours{*hours};
+
+    // incremental relay fee sets the minimum feerate increase necessary for BIP 125 replacement in the mempool
+    // and the amount the mempool min fee increases above the feerate of txs evicted due to mempool limiting.
+    if (argsman.IsArgSet("-incrementalrelayfee")) {
+        if (std::optional<CAmount> inc_relay_fee = ParseMoney(argsman.GetArg("-incrementalrelayfee", ""))) {
+            mempool_opts.incremental_relay_feerate = CFeeRate{inc_relay_fee.value()};
+        } else {
+            return AmountErrMsg("incrementalrelayfee", argsman.GetArg("-incrementalrelayfee", ""));
+        }
+    }
+
+    if (argsman.IsArgSet("-minrelaytxfee")) {
+        if (std::optional<CAmount> min_relay_feerate = ParseMoney(argsman.GetArg("-minrelaytxfee", ""))) {
+            // High fee check is done afterward in CWallet::Create()
+            mempool_opts.min_relay_feerate = CFeeRate{min_relay_feerate.value()};
+        } else {
+            return AmountErrMsg("minrelaytxfee", argsman.GetArg("-minrelaytxfee", ""));
+        }
+    } else if (mempool_opts.incremental_relay_feerate > mempool_opts.min_relay_feerate) {
+        // Allow only setting incremental fee to control both
+        mempool_opts.min_relay_feerate = mempool_opts.incremental_relay_feerate;
+        LogPrintf("Increasing minrelaytxfee to %s to match incrementalrelayfee\n", mempool_opts.min_relay_feerate.ToString());
+    }
+
+    // Feerate used to define dust.  Shouldn't be changed lightly as old
+    // implementations may inadvertently create non-standard transactions
+    if (argsman.IsArgSet("-dustrelayfee")) {
+        if (std::optional<CAmount> parsed = ParseMoney(argsman.GetArg("-dustrelayfee", ""))) {
+            mempool_opts.dust_relay_feerate = CFeeRate{parsed.value()};
+        } else {
+            return AmountErrMsg("dustrelayfee", argsman.GetArg("-dustrelayfee", ""));
+        }
+    }
+
+    mempool_opts.permit_bare_multisig = argsman.GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
+
+    if (argsman.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER)) {
+        mempool_opts.max_datacarrier_bytes = argsman.GetIntArg("-datacarriersize", MAX_OP_RETURN_RELAY);
+    } else {
+        mempool_opts.max_datacarrier_bytes = std::nullopt;
+    }
+
+    mempool_opts.require_standard = !argsman.GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
+    if (!chainparams.IsTestChain() && !mempool_opts.require_standard) {
+        return strprintf(Untranslated("acceptnonstdtxn is not currently supported for %s chain"), chainparams.NetworkIDString());
+    }
+
+    mempool_opts.full_rbf = argsman.GetBoolArg("-mempoolfullrbf", mempool_opts.full_rbf);
+
+    ApplyArgsManOptions(argsman, mempool_opts.limits);
+
+    return std::nullopt;
+}
diff --git a/src/mempool_args.h b/src/node/mempool_args.h
similarity index 57%
rename from src/mempool_args.h
rename to src/node/mempool_args.h
index 9a4abe6618f..52d8b4f2655 100644
--- a/src/mempool_args.h
+++ b/src/node/mempool_args.h
@@ -2,21 +2,26 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_MEMPOOL_ARGS_H
-#define BITCOIN_MEMPOOL_ARGS_H
+#ifndef BITCOIN_NODE_MEMPOOL_ARGS_H
+#define BITCOIN_NODE_MEMPOOL_ARGS_H
+
+#include <optional>
 
 class ArgsManager;
+class CChainParams;
+struct bilingual_str;
 namespace kernel {
 struct MemPoolOptions;
 };
 
 /**
  * Overlay the options set in \p argsman on top of corresponding members in \p mempool_opts.
+ * Returns an error if one was encountered.
  *
  * @param[in]  argsman The ArgsManager in which to check set options.
  * @param[in,out] mempool_opts The MemPoolOptions to modify according to \p argsman.
  */
-void ApplyArgsManOptions(const ArgsManager& argsman, kernel::MemPoolOptions& mempool_opts);
+[[nodiscard]] std::optional<bilingual_str> ApplyArgsManOptions(const ArgsManager& argsman, const CChainParams& chainparams, kernel::MemPoolOptions& mempool_opts);
 
 
-#endif // BITCOIN_MEMPOOL_ARGS_H
+#endif // BITCOIN_NODE_MEMPOOL_ARGS_H
diff --git a/src/node/psbt.cpp b/src/node/psbt.cpp
index 5a932f435d4..57162cd679b 100644
--- a/src/node/psbt.cpp
+++ b/src/node/psbt.cpp
@@ -137,7 +137,7 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
 
         if (success) {
             CTransaction ctx = CTransaction(mtx);
-            size_t size = GetVirtualTransactionSize(ctx, GetTransactionSigOpCost(ctx, view, STANDARD_SCRIPT_VERIFY_FLAGS));
+            size_t size(GetVirtualTransactionSize(ctx, GetTransactionSigOpCost(ctx, view, STANDARD_SCRIPT_VERIFY_FLAGS), ::nBytesPerSigOp));
             result.estimated_vsize = size;
             // Estimate fee rate
             CFeeRate feerate(fee, size);
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp
index f6452266b7f..50865428657 100644
--- a/src/policy/policy.cpp
+++ b/src/policy/policy.cpp
@@ -67,7 +67,7 @@ bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFeeIn)
     return (txout.nValue < GetDustThreshold(txout, dustRelayFeeIn));
 }
 
-bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType)
+bool IsStandard(const CScript& scriptPubKey, const std::optional<unsigned>& max_datacarrier_bytes, TxoutType& whichType)
 {
     std::vector<std::vector<unsigned char> > vSolutions;
     whichType = Solver(scriptPubKey, vSolutions);
@@ -82,15 +82,16 @@ bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType)
             return false;
         if (m < 1 || m > n)
             return false;
-    } else if (whichType == TxoutType::NULL_DATA &&
-               (!fAcceptDatacarrier || scriptPubKey.size() > nMaxDatacarrierBytes)) {
-          return false;
+    } else if (whichType == TxoutType::NULL_DATA) {
+        if (!max_datacarrier_bytes || scriptPubKey.size() > *max_datacarrier_bytes) {
+            return false;
+        }
     }
 
     return true;
 }
 
-bool IsStandardTx(const CTransaction& tx, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason)
+bool IsStandardTx(const CTransaction& tx, const std::optional<unsigned>& max_datacarrier_bytes, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason)
 {
     if (tx.nVersion > TX_MAX_STANDARD_VERSION || tx.nVersion < 1) {
         reason = "version";
@@ -130,7 +131,7 @@ bool IsStandardTx(const CTransaction& tx, bool permit_bare_multisig, const CFeeR
     unsigned int nDataOut = 0;
     TxoutType whichType;
     for (const CTxOut& txout : tx.vout) {
-        if (!::IsStandard(txout.scriptPubKey, whichType)) {
+        if (!::IsStandard(txout.scriptPubKey, max_datacarrier_bytes, whichType)) {
             reason = "scriptpubkey";
             return false;
         }
diff --git a/src/policy/policy.h b/src/policy/policy.h
index cd98a601a31..3d2660b0812 100644
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -47,8 +47,8 @@ static constexpr unsigned int MAX_STANDARD_TAPSCRIPT_STACK_ITEM_SIZE{80};
 static constexpr unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE{3600};
 /** The maximum size of a standard ScriptSig */
 static constexpr unsigned int MAX_STANDARD_SCRIPTSIG_SIZE{1650};
-/** Min feerate for defining dust. Historically this has been based on the
- * minRelayTxFee, however changing the dust limit changes which transactions are
+/** Min feerate for defining dust.
+ * Changing the dust limit changes which transactions are
  * standard and should be done with care and ideally rarely. It makes sense to
  * only increase the dust limit after prior releases were already not creating
  * outputs below the new threshold */
@@ -105,7 +105,7 @@ CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee);
 
 bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFee);
 
-bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType);
+bool IsStandard(const CScript& scriptPubKey, const std::optional<unsigned>& max_datacarrier_bytes, TxoutType& whichType);
 
 
 // Changing the default transaction version requires a two step process: first
@@ -117,7 +117,7 @@ static constexpr decltype(CTransaction::nVersion) TX_MAX_STANDARD_VERSION{2};
 * Check for standard transaction types
 * @return True if all outputs (scriptPubKeys) use only standard transaction forms
 */
-bool IsStandardTx(const CTransaction& tx, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason);
+bool IsStandardTx(const CTransaction& tx, const std::optional<unsigned>& max_datacarrier_bytes, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason);
 /**
 * Check for standard transaction types
 * @param[in] mapInputs       Map of previous transactions that have outputs we're spending
diff --git a/src/policy/settings.cpp b/src/policy/settings.cpp
index 0b67d274ce8..39e00f1111a 100644
--- a/src/policy/settings.cpp
+++ b/src/policy/settings.cpp
@@ -5,11 +5,6 @@
 
 #include <policy/settings.h>
 
-#include <policy/feerate.h>
 #include <policy/policy.h>
 
-bool fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
-CFeeRate incrementalRelayFee = CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE);
-CFeeRate dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE);
-CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE);
 unsigned int nBytesPerSigOp = DEFAULT_BYTES_PER_SIGOP;
diff --git a/src/policy/settings.h b/src/policy/settings.h
index 2311d01fe8b..f0d6f779aea 100644
--- a/src/policy/settings.h
+++ b/src/policy/settings.h
@@ -6,35 +6,6 @@
 #ifndef BITCOIN_POLICY_SETTINGS_H
 #define BITCOIN_POLICY_SETTINGS_H
 
-#include <policy/feerate.h>
-#include <policy/policy.h>
-
-#include <cstdint>
-#include <string>
-
-class CTransaction;
-
-// Policy settings which are configurable at runtime.
-extern CFeeRate incrementalRelayFee;
-extern CFeeRate dustRelayFee;
-/** A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation) */
-extern CFeeRate minRelayTxFee;
 extern unsigned int nBytesPerSigOp;
-extern bool fIsBareMultisigStd;
-
-static inline bool IsStandardTx(const CTransaction& tx, std::string& reason)
-{
-    return IsStandardTx(tx, ::fIsBareMultisigStd, ::dustRelayFee, reason);
-}
-
-static inline int64_t GetVirtualTransactionSize(int64_t weight, int64_t sigop_cost)
-{
-    return GetVirtualTransactionSize(weight, sigop_cost, ::nBytesPerSigOp);
-}
-
-static inline int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t sigop_cost)
-{
-    return GetVirtualTransactionSize(tx, sigop_cost, ::nBytesPerSigOp);
-}
 
 #endif // BITCOIN_POLICY_SETTINGS_H
diff --git a/src/rpc/fees.cpp b/src/rpc/fees.cpp
index 41f386d4430..aa047bdea87 100644
--- a/src/rpc/fees.cpp
+++ b/src/rpc/fees.cpp
@@ -6,7 +6,6 @@
 #include <core_io.h>
 #include <policy/feerate.h>
 #include <policy/fees.h>
-#include <policy/settings.h>
 #include <rpc/protocol.h>
 #include <rpc/request.h>
 #include <rpc/server.h>
@@ -88,7 +87,7 @@ static RPCHelpMan estimatesmartfee()
             CFeeRate feeRate{fee_estimator.estimateSmartFee(conf_target, &feeCalc, conservative)};
             if (feeRate != CFeeRate(0)) {
                 CFeeRate min_mempool_feerate{mempool.GetMinFee()};
-                CFeeRate min_relay_feerate{::minRelayTxFee};
+                CFeeRate min_relay_feerate{mempool.m_min_relay_feerate};
                 feeRate = std::max({feeRate, min_mempool_feerate, min_relay_feerate});
                 result.pushKV("feerate", ValueFromAmount(feeRate.GetFeePerK()));
             } else {
diff --git a/src/rpc/mempool.cpp b/src/rpc/mempool.cpp
index 0ae10b6c39e..02b51ce0a04 100644
--- a/src/rpc/mempool.cpp
+++ b/src/rpc/mempool.cpp
@@ -666,9 +666,9 @@ UniValue MempoolInfoToJSON(const CTxMemPool& pool)
     ret.pushKV("usage", (int64_t)pool.DynamicMemoryUsage());
     ret.pushKV("total_fee", ValueFromAmount(pool.GetTotalFee()));
     ret.pushKV("maxmempool", pool.m_max_size_bytes);
-    ret.pushKV("mempoolminfee", ValueFromAmount(std::max(pool.GetMinFee(), ::minRelayTxFee).GetFeePerK()));
-    ret.pushKV("minrelaytxfee", ValueFromAmount(::minRelayTxFee.GetFeePerK()));
-    ret.pushKV("incrementalrelayfee", ValueFromAmount(::incrementalRelayFee.GetFeePerK()));
+    ret.pushKV("mempoolminfee", ValueFromAmount(std::max(pool.GetMinFee(), pool.m_min_relay_feerate).GetFeePerK()));
+    ret.pushKV("minrelaytxfee", ValueFromAmount(pool.m_min_relay_feerate.GetFeePerK()));
+    ret.pushKV("incrementalrelayfee", ValueFromAmount(pool.m_incremental_relay_feerate.GetFeePerK()));
     ret.pushKV("unbroadcastcount", uint64_t{pool.GetUnbroadcastTxs().size()});
     ret.pushKV("fullrbf", pool.m_full_rbf);
     return ret;
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index 059be61bb43..0ee905a77a9 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -645,8 +645,11 @@ static RPCHelpMan getnetworkinfo()
         obj.pushKV("connections_out", node.connman->GetNodeCount(ConnectionDirection::Out));
     }
     obj.pushKV("networks",      GetNetworksInfo());
-    obj.pushKV("relayfee",      ValueFromAmount(::minRelayTxFee.GetFeePerK()));
-    obj.pushKV("incrementalfee", ValueFromAmount(::incrementalRelayFee.GetFeePerK()));
+    if (node.mempool) {
+        // Those fields can be deprecated, to be replaced by the getmempoolinfo fields
+        obj.pushKV("relayfee", ValueFromAmount(node.mempool->m_min_relay_feerate.GetFeePerK()));
+        obj.pushKV("incrementalfee", ValueFromAmount(node.mempool->m_incremental_relay_feerate.GetFeePerK()));
+    }
     UniValue localAddresses(UniValue::VARR);
     {
         LOCK(g_maplocalhost_mutex);
diff --git a/src/script/standard.cpp b/src/script/standard.cpp
index b3f6a1b6698..61017380612 100644
--- a/src/script/standard.cpp
+++ b/src/script/standard.cpp
@@ -16,9 +16,6 @@
 
 typedef std::vector<unsigned char> valtype;
 
-bool fAcceptDatacarrier = DEFAULT_ACCEPT_DATACARRIER;
-unsigned nMaxDatacarrierBytes = MAX_OP_RETURN_RELAY;
-
 CScriptID::CScriptID(const CScript& in) : BaseHash(Hash160(in)) {}
 CScriptID::CScriptID(const ScriptHash& in) : BaseHash(static_cast<uint160>(in)) {}
 
diff --git a/src/script/standard.h b/src/script/standard.h
index 448fdff0109..1e6769782a3 100644
--- a/src/script/standard.h
+++ b/src/script/standard.h
@@ -33,20 +33,11 @@ public:
 };
 
 /**
- * Default setting for nMaxDatacarrierBytes. 80 bytes of data, +1 for OP_RETURN,
+ * Default setting for -datacarriersize. 80 bytes of data, +1 for OP_RETURN,
  * +2 for the pushdata opcodes.
  */
 static const unsigned int MAX_OP_RETURN_RELAY = 83;
 
-/**
- * A data carrying output is an unspendable output containing data. The script
- * type is designated as TxoutType::NULL_DATA.
- */
-extern bool fAcceptDatacarrier;
-
-/** Maximum size of TxoutType::NULL_DATA scripts that this node considers standard. */
-extern unsigned nMaxDatacarrierBytes;
-
 /**
  * Mandatory script verification flags that all new blocks must comply with for
  * them to be valid. (but old blocks may not comply with) Currently just P2SH,
diff --git a/src/test/fuzz/integer.cpp b/src/test/fuzz/integer.cpp
index 72574612a20..c52fca5fe85 100644
--- a/src/test/fuzz/integer.cpp
+++ b/src/test/fuzz/integer.cpp
@@ -87,9 +87,6 @@ FUZZ_TARGET_INIT(integer, initialize_integer)
     }
     (void)GetSizeOfCompactSize(u64);
     (void)GetSpecialScriptSize(u32);
-    if (!MultiplicationOverflow(i64, static_cast<int64_t>(::nBytesPerSigOp)) && !AdditionOverflow(i64 * ::nBytesPerSigOp, static_cast<int64_t>(4))) {
-        (void)GetVirtualTransactionSize(i64, i64);
-    }
     if (!MultiplicationOverflow(i64, static_cast<int64_t>(u32)) && !AdditionOverflow(i64, static_cast<int64_t>(4)) && !AdditionOverflow(i64 * u32, static_cast<int64_t>(4))) {
         (void)GetVirtualTransactionSize(i64, i64, u32);
     }
diff --git a/src/test/fuzz/key.cpp b/src/test/fuzz/key.cpp
index bfea9778f4d..6d2d2e2bc58 100644
--- a/src/test/fuzz/key.cpp
+++ b/src/test/fuzz/key.cpp
@@ -157,12 +157,12 @@ FUZZ_TARGET_INIT(key, initialize_key)
         assert(fillable_signing_provider_pub.HaveKey(pubkey.GetID()));
 
         TxoutType which_type_tx_pubkey;
-        const bool is_standard_tx_pubkey = IsStandard(tx_pubkey_script, which_type_tx_pubkey);
+        const bool is_standard_tx_pubkey = IsStandard(tx_pubkey_script, std::nullopt, which_type_tx_pubkey);
         assert(is_standard_tx_pubkey);
         assert(which_type_tx_pubkey == TxoutType::PUBKEY);
 
         TxoutType which_type_tx_multisig;
-        const bool is_standard_tx_multisig = IsStandard(tx_multisig_script, which_type_tx_multisig);
+        const bool is_standard_tx_multisig = IsStandard(tx_multisig_script, std::nullopt, which_type_tx_multisig);
         assert(is_standard_tx_multisig);
         assert(which_type_tx_multisig == TxoutType::MULTISIG);
 
diff --git a/src/test/fuzz/rbf.cpp b/src/test/fuzz/rbf.cpp
index 4801635791a..1a06ae886ee 100644
--- a/src/test/fuzz/rbf.cpp
+++ b/src/test/fuzz/rbf.cpp
@@ -2,7 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <mempool_args.h>
+#include <node/mempool_args.h>
 #include <policy/rbf.h>
 #include <primitives/transaction.h>
 #include <sync.h>
diff --git a/src/test/fuzz/script.cpp b/src/test/fuzz/script.cpp
index fdcd0da37de..69a4b782aaa 100644
--- a/src/test/fuzz/script.cpp
+++ b/src/test/fuzz/script.cpp
@@ -55,7 +55,7 @@ FUZZ_TARGET_INIT(script, initialize_script)
     }
 
     TxoutType which_type;
-    bool is_standard_ret = IsStandard(script, which_type);
+    bool is_standard_ret = IsStandard(script, std::nullopt, which_type);
     if (!is_standard_ret) {
         assert(which_type == TxoutType::NONSTANDARD ||
                which_type == TxoutType::NULL_DATA ||
diff --git a/src/test/fuzz/transaction.cpp b/src/test/fuzz/transaction.cpp
index 273aa0dc5c8..7fa45238001 100644
--- a/src/test/fuzz/transaction.cpp
+++ b/src/test/fuzz/transaction.cpp
@@ -69,8 +69,8 @@ FUZZ_TARGET_INIT(transaction, initialize_transaction)
 
     const CFeeRate dust_relay_fee{DUST_RELAY_TX_FEE};
     std::string reason;
-    const bool is_standard_with_permit_bare_multisig = IsStandardTx(tx, /* permit_bare_multisig= */ true, dust_relay_fee, reason);
-    const bool is_standard_without_permit_bare_multisig = IsStandardTx(tx, /* permit_bare_multisig= */ false, dust_relay_fee, reason);
+    const bool is_standard_with_permit_bare_multisig = IsStandardTx(tx, std::nullopt, /* permit_bare_multisig= */ true, dust_relay_fee, reason);
+    const bool is_standard_without_permit_bare_multisig = IsStandardTx(tx, std::nullopt, /* permit_bare_multisig= */ false, dust_relay_fee, reason);
     if (is_standard_without_permit_bare_multisig) {
         assert(is_standard_with_permit_bare_multisig);
     }
@@ -92,7 +92,6 @@ FUZZ_TARGET_INIT(transaction, initialize_transaction)
     (void)GetTransactionWeight(tx);
     (void)GetVirtualTransactionSize(tx);
     (void)IsFinalTx(tx, /* nBlockHeight= */ 1024, /* nBlockTime= */ 1024);
-    (void)IsStandardTx(tx, reason);
     (void)RecursiveDynamicUsage(tx);
     (void)SignalsOptInRBF(tx);
 
diff --git a/src/test/fuzz/tx_pool.cpp b/src/test/fuzz/tx_pool.cpp
index cfb112879af..3191367870a 100644
--- a/src/test/fuzz/tx_pool.cpp
+++ b/src/test/fuzz/tx_pool.cpp
@@ -3,8 +3,8 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <consensus/validation.h>
-#include <mempool_args.h>
 #include <node/context.h>
+#include <node/mempool_args.h>
 #include <node/miner.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
@@ -116,7 +116,7 @@ void MockTime(FuzzedDataProvider& fuzzed_data_provider, const CChainState& chain
     SetMockTime(time);
 }
 
-CTxMemPool MakeMempool(const NodeContext& node)
+CTxMemPool MakeMempool(FuzzedDataProvider& fuzzed_data_provider, const NodeContext& node)
 {
     // Take the default options for tests...
     CTxMemPool::Options mempool_opts{MemPoolOptionsForTest(node)};
@@ -124,6 +124,7 @@ CTxMemPool MakeMempool(const NodeContext& node)
     // ...override specific options for this specific fuzz suite
     mempool_opts.estimator = nullptr;
     mempool_opts.check_ratio = 1;
+    mempool_opts.require_standard = fuzzed_data_provider.ConsumeBool();
 
     // ...and construct a CTxMemPool from it
     return CTxMemPool{mempool_opts};
@@ -150,7 +151,7 @@ FUZZ_TARGET_INIT(tx_pool_standard, initialize_tx_pool)
     constexpr CAmount SUPPLY_TOTAL{COINBASE_MATURITY * 50 * COIN};
 
     SetMempoolConstraints(*node.args, fuzzed_data_provider);
-    CTxMemPool tx_pool_{MakeMempool(node)};
+    CTxMemPool tx_pool_{MakeMempool(fuzzed_data_provider, node)};
     MockedTxPool& tx_pool = *static_cast<MockedTxPool*>(&tx_pool_);
 
     chainstate.SetMempool(&tx_pool);
@@ -237,7 +238,6 @@ FUZZ_TARGET_INIT(tx_pool_standard, initialize_tx_pool)
         auto txr = std::make_shared<TransactionsDelta>(removed, added);
         RegisterSharedValidationInterface(txr);
         const bool bypass_limits = fuzzed_data_provider.ConsumeBool();
-        ::fRequireStandard = fuzzed_data_provider.ConsumeBool();
 
         // Make sure ProcessNewPackage on one transaction works.
         // The result is not guaranteed to be the same as what is returned by ATMP.
@@ -325,7 +325,7 @@ FUZZ_TARGET_INIT(tx_pool, initialize_tx_pool)
     }
 
     SetMempoolConstraints(*node.args, fuzzed_data_provider);
-    CTxMemPool tx_pool_{MakeMempool(node)};
+    CTxMemPool tx_pool_{MakeMempool(fuzzed_data_provider, node)};
     MockedTxPool& tx_pool = *static_cast<MockedTxPool*>(&tx_pool_);
 
     LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 300)
@@ -348,7 +348,6 @@ FUZZ_TARGET_INIT(tx_pool, initialize_tx_pool)
 
         const auto tx = MakeTransactionRef(mut_tx);
         const bool bypass_limits = fuzzed_data_provider.ConsumeBool();
-        ::fRequireStandard = fuzzed_data_provider.ConsumeBool();
         const auto res = WITH_LOCK(::cs_main, return AcceptToMemoryPool(chainstate, tx, GetTime(), bypass_limits, /*test_accept=*/false));
         const bool accepted = res.m_result_type == MempoolAcceptResult::ResultType::VALID;
         if (accepted) {
diff --git a/src/test/fuzz/validation_load_mempool.cpp b/src/test/fuzz/validation_load_mempool.cpp
index 90c1a71d9f5..8241dff1897 100644
--- a/src/test/fuzz/validation_load_mempool.cpp
+++ b/src/test/fuzz/validation_load_mempool.cpp
@@ -5,7 +5,7 @@
 #include <kernel/mempool_persist.h>
 
 #include <chainparamsbase.h>
-#include <mempool_args.h>
+#include <node/mempool_args.h>
 #include <node/mempool_persist_args.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
diff --git a/src/test/multisig_tests.cpp b/src/test/multisig_tests.cpp
index dccc7ce7956..ce23d6013d9 100644
--- a/src/test/multisig_tests.cpp
+++ b/src/test/multisig_tests.cpp
@@ -141,23 +141,30 @@ BOOST_AUTO_TEST_CASE(multisig_IsStandard)
     for (int i = 0; i < 4; i++)
         key[i].MakeNewKey(true);
 
-    TxoutType whichType;
+    const auto is_standard{[](const CScript& spk) {
+        TxoutType type;
+        bool res{::IsStandard(spk, std::nullopt, type)};
+        if (res) {
+            BOOST_CHECK_EQUAL(type, TxoutType::MULTISIG);
+        }
+        return res;
+    }};
 
     CScript a_and_b;
     a_and_b << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
-    BOOST_CHECK(::IsStandard(a_and_b, whichType));
+    BOOST_CHECK(is_standard(a_and_b));
 
     CScript a_or_b;
     a_or_b  << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
-    BOOST_CHECK(::IsStandard(a_or_b, whichType));
+    BOOST_CHECK(is_standard(a_or_b));
 
     CScript escrow;
     escrow << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << ToByteVector(key[2].GetPubKey()) << OP_3 << OP_CHECKMULTISIG;
-    BOOST_CHECK(::IsStandard(escrow, whichType));
+    BOOST_CHECK(is_standard(escrow));
 
     CScript one_of_four;
     one_of_four << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << ToByteVector(key[2].GetPubKey()) << ToByteVector(key[3].GetPubKey()) << OP_4 << OP_CHECKMULTISIG;
-    BOOST_CHECK(!::IsStandard(one_of_four, whichType));
+    BOOST_CHECK(!is_standard(one_of_four));
 
     CScript malformed[6];
     malformed[0] << OP_3 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
@@ -167,8 +174,9 @@ BOOST_AUTO_TEST_CASE(multisig_IsStandard)
     malformed[4] << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_CHECKMULTISIG;
     malformed[5] << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey());
 
-    for (int i = 0; i < 6; i++)
-        BOOST_CHECK(!::IsStandard(malformed[i], whichType));
+    for (int i = 0; i < 6; i++) {
+        BOOST_CHECK(!is_standard(malformed[i]));
+    }
 }
 
 BOOST_AUTO_TEST_CASE(multisig_Sign)
diff --git a/src/test/script_p2sh_tests.cpp b/src/test/script_p2sh_tests.cpp
index a221e02d2f9..6e810faa0a0 100644
--- a/src/test/script_p2sh_tests.cpp
+++ b/src/test/script_p2sh_tests.cpp
@@ -18,6 +18,11 @@
 #include <boost/test/unit_test.hpp>
 
 // Helpers:
+bool IsStandardTx(const CTransaction& tx, std::string& reason)
+{
+    return IsStandardTx(tx, std::nullopt, DEFAULT_PERMIT_BAREMULTISIG, CFeeRate{DUST_RELAY_TX_FEE}, reason);
+}
+
 static std::vector<unsigned char>
 Serialize(const CScript& s)
 {
@@ -49,7 +54,6 @@ BOOST_FIXTURE_TEST_SUITE(script_p2sh_tests, BasicTestingSetup)
 
 BOOST_AUTO_TEST_CASE(sign)
 {
-    LOCK(cs_main);
     // Pay-to-script-hash looks like this:
     // scriptSig:    <sig> <sig...> <serialized_script>
     // scriptPubKey: HASH160 <hash> EQUAL
@@ -149,7 +153,6 @@ BOOST_AUTO_TEST_CASE(norecurse)
 
 BOOST_AUTO_TEST_CASE(set)
 {
-    LOCK(cs_main);
     // Test the CScript::Set* methods
     FillableSigningProvider keystore;
     CKey key[4];
@@ -263,7 +266,6 @@ BOOST_AUTO_TEST_CASE(switchover)
 
 BOOST_AUTO_TEST_CASE(AreInputsStandard)
 {
-    LOCK(cs_main);
     CCoinsView coinsDummy;
     CCoinsViewCache coins(&coinsDummy);
     FillableSigningProvider keystore;
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
index 4e6c223ccc4..cd6bf113273 100644
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -40,6 +40,9 @@ typedef std::vector<unsigned char> valtype;
 // In script_tests.cpp
 UniValue read_json(const std::string& jsondata);
 
+static CFeeRate g_dust{DUST_RELAY_TX_FEE};
+static bool g_bare_multi{DEFAULT_PERMIT_BAREMULTISIG};
+
 static std::map<std::string, unsigned int> mapFlagNames = {
     {std::string("P2SH"), (unsigned int)SCRIPT_VERIFY_P2SH},
     {std::string("STRICTENC"), (unsigned int)SCRIPT_VERIFY_STRICTENC},
@@ -745,7 +748,6 @@ BOOST_AUTO_TEST_CASE(test_witness)
 
 BOOST_AUTO_TEST_CASE(test_IsStandard)
 {
-    LOCK(cs_main);
     FillableSigningProvider keystore;
     CCoinsView coinsDummy;
     CCoinsViewCache coins(&coinsDummy);
@@ -765,19 +767,19 @@ BOOST_AUTO_TEST_CASE(test_IsStandard)
 
     constexpr auto CheckIsStandard = [](const auto& t) {
         std::string reason;
-        BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
+        BOOST_CHECK(IsStandardTx(CTransaction{t}, MAX_OP_RETURN_RELAY, g_bare_multi, g_dust, reason));
         BOOST_CHECK(reason.empty());
     };
     constexpr auto CheckIsNotStandard = [](const auto& t, const std::string& reason_in) {
         std::string reason;
-        BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
+        BOOST_CHECK(!IsStandardTx(CTransaction{t}, MAX_OP_RETURN_RELAY, g_bare_multi, g_dust, reason));
         BOOST_CHECK_EQUAL(reason_in, reason);
     };
 
     CheckIsStandard(t);
 
     // Check dust with default relay fee:
-    CAmount nDustThreshold = 182 * dustRelayFee.GetFeePerK() / 1000;
+    CAmount nDustThreshold = 182 * g_dust.GetFeePerK() / 1000;
     BOOST_CHECK_EQUAL(nDustThreshold, 546);
     // dust:
     t.vout[0].nValue = nDustThreshold - 1;
@@ -805,14 +807,14 @@ BOOST_AUTO_TEST_CASE(test_IsStandard)
 
     // Check dust with odd relay fee to verify rounding:
     // nDustThreshold = 182 * 3702 / 1000
-    dustRelayFee = CFeeRate(3702);
+    g_dust = CFeeRate(3702);
     // dust:
     t.vout[0].nValue = 674 - 1;
     CheckIsNotStandard(t, "dust");
     // not dust:
     t.vout[0].nValue = 674;
     CheckIsStandard(t);
-    dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE);
+    g_dust = CFeeRate{DUST_RELAY_TX_FEE};
 
     t.vout[0].scriptPubKey = CScript() << OP_1;
     CheckIsNotStandard(t, "scriptpubkey");
@@ -924,16 +926,16 @@ BOOST_AUTO_TEST_CASE(test_IsStandard)
     BOOST_CHECK_EQUAL(GetTransactionWeight(CTransaction(t)), 400004);
     CheckIsNotStandard(t, "tx-size");
 
-    // Check bare multisig (standard if policy flag fIsBareMultisigStd is set)
-    fIsBareMultisigStd = true;
+    // Check bare multisig (standard if policy flag g_bare_multi is set)
+    g_bare_multi = true;
     t.vout[0].scriptPubKey = GetScriptForMultisig(1, {key.GetPubKey()}); // simple 1-of-1
     t.vin.resize(1);
     t.vin[0].scriptSig = CScript() << std::vector<unsigned char>(65, 0);
     CheckIsStandard(t);
 
-    fIsBareMultisigStd = false;
+    g_bare_multi = false;
     CheckIsNotStandard(t, "bare-multisig");
-    fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
+    g_bare_multi = DEFAULT_PERMIT_BAREMULTISIG;
 
     // Check P2WPKH outputs dust threshold
     t.vout[0].scriptPubKey = CScript() << OP_0 << ParseHex("ffffffffffffffffffffffffffffffffffffffff");
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
index 67984721a37..dc6e000c65a 100644
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -14,12 +14,12 @@
 #include <init.h>
 #include <init/common.h>
 #include <interfaces/chain.h>
-#include <mempool_args.h>
 #include <net.h>
 #include <net_processing.h>
 #include <node/blockstorage.h>
 #include <node/chainstate.h>
 #include <node/context.h>
+#include <node/mempool_args.h>
 #include <node/miner.h>
 #include <noui.h>
 #include <policy/fees.h>
@@ -160,7 +160,8 @@ CTxMemPool::Options MemPoolOptionsForTest(const NodeContext& node)
         // chainparams.DefaultConsistencyChecks for tests
         .check_ratio = 1,
     };
-    ApplyArgsManOptions(*node.args, mempool_opts);
+    const auto err{ApplyArgsManOptions(*node.args, ::Params(), mempool_opts)};
+    Assert(!err);
     return mempool_opts;
 }
 
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 7eff6bdbe32..b151953d0d6 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -106,7 +106,7 @@ void CTxMemPoolEntry::UpdateLockPoints(const LockPoints& lp)
 
 size_t CTxMemPoolEntry::GetTxSize() const
 {
-    return GetVirtualTransactionSize(nTxWeight, sigOpCost);
+    return GetVirtualTransactionSize(nTxWeight, sigOpCost, ::nBytesPerSigOp);
 }
 
 void CTxMemPool::UpdateForDescendants(txiter updateIt, cacheMap& cachedDescendants,
@@ -458,6 +458,12 @@ CTxMemPool::CTxMemPool(const Options& opts)
       minerPolicyEstimator{opts.estimator},
       m_max_size_bytes{opts.max_size_bytes},
       m_expiry{opts.expiry},
+      m_incremental_relay_feerate{opts.incremental_relay_feerate},
+      m_min_relay_feerate{opts.min_relay_feerate},
+      m_dust_relay_feerate{opts.dust_relay_feerate},
+      m_permit_bare_multisig{opts.permit_bare_multisig},
+      m_max_datacarrier_bytes{opts.max_datacarrier_bytes},
+      m_require_standard{opts.require_standard},
       m_full_rbf{opts.full_rbf},
       m_limits{opts.limits}
 {
@@ -1117,12 +1123,12 @@ CFeeRate CTxMemPool::GetMinFee(size_t sizelimit) const {
         rollingMinimumFeeRate = rollingMinimumFeeRate / pow(2.0, (time - lastRollingFeeUpdate) / halflife);
         lastRollingFeeUpdate = time;
 
-        if (rollingMinimumFeeRate < (double)incrementalRelayFee.GetFeePerK() / 2) {
+        if (rollingMinimumFeeRate < (double)m_incremental_relay_feerate.GetFeePerK() / 2) {
             rollingMinimumFeeRate = 0;
             return CFeeRate(0);
         }
     }
-    return std::max(CFeeRate(llround(rollingMinimumFeeRate)), incrementalRelayFee);
+    return std::max(CFeeRate(llround(rollingMinimumFeeRate)), m_incremental_relay_feerate);
 }
 
 void CTxMemPool::trackPackageRemoved(const CFeeRate& rate) {
@@ -1146,7 +1152,7 @@ void CTxMemPool::TrimToSize(size_t sizelimit, std::vector<COutPoint>* pvNoSpends
         // to have 0 fee). This way, we don't allow txn to enter mempool with feerate
         // equal to txn which were removed with no block in between.
         CFeeRate removed(it->GetModFeesWithDescendants(), it->GetSizeWithDescendants());
-        removed += incrementalRelayFee;
+        removed += m_incremental_relay_feerate;
         trackPackageRemoved(removed);
         maxFeeRateRemoved = std::max(maxFeeRateRemoved, removed);
 
diff --git a/src/txmempool.h b/src/txmempool.h
index d7d308038c2..73904cc3700 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -568,6 +568,12 @@ public:
 
     const int64_t m_max_size_bytes;
     const std::chrono::seconds m_expiry;
+    const CFeeRate m_incremental_relay_feerate;
+    const CFeeRate m_min_relay_feerate;
+    const CFeeRate m_dust_relay_feerate;
+    const bool m_permit_bare_multisig;
+    const std::optional<unsigned> m_max_datacarrier_bytes;
+    const bool m_require_standard;
     const bool m_full_rbf;
 
     using Limits = kernel::MemPoolLimits;
@@ -702,11 +708,11 @@ public:
     void CalculateDescendants(txiter it, setEntries& setDescendants) const EXCLUSIVE_LOCKS_REQUIRED(cs);
 
     /** The minimum fee to get into the mempool, which may itself not be enough
-      *  for larger-sized transactions.
-      *  The incrementalRelayFee policy variable is used to bound the time it
-      *  takes the fee rate to go back down all the way to 0. When the feerate
-      *  would otherwise be half of this, it is set to 0 instead.
-      */
+     *  for larger-sized transactions.
+     *  The m_incremental_relay_feerate policy variable is used to bound the time it
+     *  takes the fee rate to go back down all the way to 0. When the feerate
+     *  would otherwise be half of this, it is set to 0 instead.
+     */
     CFeeRate GetMinFee() const {
         return GetMinFee(m_max_size_bytes);
     }
diff --git a/src/validation.cpp b/src/validation.cpp
index 17211956f57..d018d185e91 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -124,7 +124,6 @@ GlobalMutex g_best_block_mutex;
 std::condition_variable g_best_block_cv;
 uint256 g_best_block;
 bool g_parallel_script_checks{false};
-bool fRequireStandard = true;
 bool fCheckBlockIndex = false;
 bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED;
 int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE;
@@ -647,8 +646,9 @@ private:
             return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "mempool min fee not met", strprintf("%d < %d", package_fee, mempoolRejectFee));
         }
 
-        if (package_fee < ::minRelayTxFee.GetFee(package_size)) {
-            return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "min relay fee not met", strprintf("%d < %d", package_fee, ::minRelayTxFee.GetFee(package_size)));
+        if (package_fee < m_pool.m_min_relay_feerate.GetFee(package_size)) {
+            return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "min relay fee not met",
+                                 strprintf("%d < %d", package_fee, m_pool.m_min_relay_feerate.GetFee(package_size)));
         }
         return true;
     }
@@ -700,8 +700,9 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
 
     // Rather not work on nonstandard transactions (unless -testnet/-regtest)
     std::string reason;
-    if (fRequireStandard && !IsStandardTx(tx, reason))
+    if (m_pool.m_require_standard && !IsStandardTx(tx, m_pool.m_max_datacarrier_bytes, m_pool.m_permit_bare_multisig, m_pool.m_dust_relay_feerate, reason)) {
         return state.Invalid(TxValidationResult::TX_NOT_STANDARD, reason);
+    }
 
     // Do not work on transactions that are too small.
     // A transaction with 1 segwit input and 1 P2WPHK output has non-witness size of 82 bytes.
@@ -807,13 +808,14 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
         return false; // state filled in by CheckTxInputs
     }
 
-    if (fRequireStandard && !AreInputsStandard(tx, m_view)) {
+    if (m_pool.m_require_standard && !AreInputsStandard(tx, m_view)) {
         return state.Invalid(TxValidationResult::TX_INPUTS_NOT_STANDARD, "bad-txns-nonstandard-inputs");
     }
 
     // Check for non-standard witnesses.
-    if (tx.HasWitness() && fRequireStandard && !IsWitnessStandard(tx, m_view))
+    if (tx.HasWitness() && m_pool.m_require_standard && !IsWitnessStandard(tx, m_view)) {
         return state.Invalid(TxValidationResult::TX_WITNESS_MUTATED, "bad-witness-nonstandard");
+    }
 
     int64_t nSigOpsCost = GetTransactionSigOpCost(tx, m_view, STANDARD_SCRIPT_VERIFY_FLAGS);
 
@@ -840,7 +842,7 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
         return state.Invalid(TxValidationResult::TX_NOT_STANDARD, "bad-txns-too-many-sigops",
                 strprintf("%d", nSigOpsCost));
 
-    // No individual transactions are allowed below minRelayTxFee and mempool min fee except from
+    // No individual transactions are allowed below the min relay feerate and mempool min feerate except from
     // disconnected blocks and transactions in a package. Package transactions will be checked using
     // package feerate later.
     if (!bypass_limits && !args.m_package_feerates && !CheckFeeRate(ws.m_vsize, ws.m_modified_fees, state)) return false;
@@ -958,7 +960,7 @@ bool MemPoolAccept::ReplacementChecks(Workspace& ws)
         ws.m_conflicting_size += it->GetTxSize();
     }
     if (const auto err_string{PaysForRBF(ws.m_conflicting_fees, ws.m_modified_fees, ws.m_vsize,
-                                         ::incrementalRelayFee, hash)}) {
+                                         m_pool.m_incremental_relay_feerate, hash)}) {
         return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "insufficient fee", *err_string);
     }
     return true;
diff --git a/src/validation.h b/src/validation.h
index 9fef69799be..df9146852f8 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -100,7 +100,6 @@ extern uint256 g_best_block;
  * False indicates all script checking is done on the main threadMessageHandler thread.
  */
 extern bool g_parallel_script_checks;
-extern bool fRequireStandard;
 extern bool fCheckBlockIndex;
 extern bool fCheckpointsEnabled;
 /** If the tip is older than this (in seconds), the node is considered to be in initial block download. */
diff --git a/src/wallet/fees.cpp b/src/wallet/fees.cpp
index 6f81fa30a1d..3514d018b7d 100644
--- a/src/wallet/fees.cpp
+++ b/src/wallet/fees.cpp
@@ -87,7 +87,7 @@ CFeeRate GetDiscardRate(const CWallet& wallet)
     CFeeRate discard_rate = wallet.chain().estimateSmartFee(highest_target, false /* conservative */);
     // Don't let discard_rate be greater than longest possible fee estimate if we get a valid fee estimate
     discard_rate = (discard_rate == CFeeRate(0)) ? wallet.m_discard_rate : std::min(discard_rate, wallet.m_discard_rate);
-    // Discard rate must be at least dustRelayFee
+    // Discard rate must be at least dust relay feerate
     discard_rate = std::max(discard_rate, wallet.chain().relayDustFee());
     return discard_rate;
 }
diff --git a/test/functional/p2p_segwit.py b/test/functional/p2p_segwit.py
index db6954ccf65..311b0b67dbd 100755
--- a/test/functional/p2p_segwit.py
+++ b/test/functional/p2p_segwit.py
@@ -245,7 +245,7 @@ class SegWitTest(BitcoinTestFramework):
         self.test_node = self.nodes[0].add_p2p_connection(TestP2PConn(), services=P2P_SERVICES)
         # self.old_node sets only NODE_NETWORK
         self.old_node = self.nodes[0].add_p2p_connection(TestP2PConn(), services=NODE_NETWORK)
-        # self.std_node is for testing node1 (fRequireStandard=true)
+        # self.std_node is for testing node1 (requires standard txs)
         self.std_node = self.nodes[1].add_p2p_connection(TestP2PConn(), services=P2P_SERVICES)
         # self.std_wtx_node is for testing node1 with wtxid relay
         self.std_wtx_node = self.nodes[1].add_p2p_connection(TestP2PConn(wtxidrelay=True), services=P2P_SERVICES)
@@ -1382,7 +1382,7 @@ class SegWitTest(BitcoinTestFramework):
         tx3.vout.append(CTxOut(total_value - 1000, script_pubkey))
         tx3.rehash()
 
-        # First we test this transaction against fRequireStandard=true node
+        # First we test this transaction against std_node
         # making sure the txid is added to the reject filter
         self.std_node.announce_tx_and_wait_for_getdata(tx3)
         test_transaction_acceptance(self.nodes[1], self.std_node, tx3, with_witness=True, accepted=False, reason="bad-txns-nonstandard-inputs")
@@ -1390,7 +1390,7 @@ class SegWitTest(BitcoinTestFramework):
         self.std_node.announce_tx_and_wait_for_getdata(tx3, success=False)
 
         # Spending a higher version witness output is not allowed by policy,
-        # even with fRequireStandard=false.
+        # even with the node that accepts non-standard txs.
         test_transaction_acceptance(self.nodes[0], self.test_node, tx3, with_witness=True, accepted=False, reason="reserved for soft-fork upgrades")
 
         # Building a block with the transaction must be valid, however.