3 files changed, 9 insertions, 7 deletions
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index 5ca921ae2f..65a7c2963d 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -159,7 +159,7 @@ static std::vector<RPCArg> CreateTxDoc()
             },
         },
         {"locktime", RPCArg::Type::NUM, RPCArg::Default{0}, "Raw locktime. Non-0 value also locktime-activates inputs"},
-        {"replaceable", RPCArg::Type::BOOL, RPCArg::Default{false}, "Marks this transaction as BIP125-replaceable.\n"
+        {"replaceable", RPCArg::Type::BOOL, RPCArg::Default{true}, "Marks this transaction as BIP125-replaceable.\n"
                 "Allows this transaction to be replaced by a transaction with higher fees. If provided, it is an error if explicit sequence numbers are incompatible."},
     };
 }
@@ -304,7 +304,7 @@ static RPCHelpMan createrawtransaction()
         }, true
     );
 
-    bool rbf = false;
+    std::optional<bool> rbf;
     if (!request.params[3].isNull()) {
         rbf = request.params[3].isTrue();
     }
@@ -1453,7 +1453,7 @@ static RPCHelpMan createpsbt()
         }, true
     );
 
-    bool rbf = false;
+    std::optional<bool> rbf;
     if (!request.params[3].isNull()) {
         rbf = request.params[3].isTrue();
     }
diff --git a/src/rpc/rawtransaction_util.cpp b/src/rpc/rawtransaction_util.cpp
index 86b5b7e960..b06e9f6e4b 100644
--- a/src/rpc/rawtransaction_util.cpp
+++ b/src/rpc/rawtransaction_util.cpp
@@ -21,7 +21,7 @@
 #include <util/strencodings.h>
 #include <util/translation.h>
 
-CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, bool rbf)
+CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, std::optional<bool> rbf)
 {
     if (outputs_in.isNull()) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, output argument must be non-null");
@@ -60,7 +60,8 @@ CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniVal
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout cannot be negative");
 
         uint32_t nSequence;
-        if (rbf) {
+
+        if (rbf.value_or(true)) {
             nSequence = MAX_BIP125_RBF_SEQUENCE; /* CTxIn::SEQUENCE_FINAL - 2 */
         } else if (rawTx.nLockTime) {
             nSequence = CTxIn::MAX_SEQUENCE_NONFINAL; /* CTxIn::SEQUENCE_FINAL - 1 */
@@ -132,7 +133,7 @@ CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniVal
         }
     }
 
-    if (rbf && rawTx.vin.size() > 0 && !SignalsOptInRBF(CTransaction(rawTx))) {
+    if (rbf.has_value() && rbf.value() && rawTx.vin.size() > 0 && !SignalsOptInRBF(CTransaction(rawTx))) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter combination: Sequence number(s) contradict replaceable option");
     }
 
diff --git a/src/rpc/rawtransaction_util.h b/src/rpc/rawtransaction_util.h
index c3eb1417f8..9b5c9f08d4 100644
--- a/src/rpc/rawtransaction_util.h
+++ b/src/rpc/rawtransaction_util.h
@@ -7,6 +7,7 @@
 
 #include <map>
 #include <string>
+#include <optional>
 
 struct bilingual_str;
 class FillableSigningProvider;
@@ -38,6 +39,6 @@ void SignTransactionResultToJSON(CMutableTransaction& mtx, bool complete, const
 void ParsePrevouts(const UniValue& prevTxsUnival, FillableSigningProvider* keystore, std::map<COutPoint, Coin>& coins);
 
 /** Create a transaction from univalue parameters */
-CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, bool rbf);
+CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, std::optional<bool> rbf);
 
 #endif // BITCOIN_RPC_RAWTRANSACTION_UTIL_H