diff --git a/src/rpc/client.cpp b/src/rpc/client.cpp
index a266580b3..c19160d32 100644
--- a/src/rpc/client.cpp
+++ b/src/rpc/client.cpp
@@ -92,6 +92,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "signrawtransactionwithkey", 2, "prevtxs" },
     { "signrawtransactionwithwallet", 1, "prevtxs" },
     { "sendrawtransaction", 1, "allowhighfees" },
+    { "sendrawtransaction", 1, "maxfeerate" },
     { "testmempoolaccept", 0, "rawtxs" },
     { "testmempoolaccept", 1, "allowhighfees" },
     { "combinerawtransaction", 0, "txs" },
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index d19afaa8a..fedc30dc3 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -28,6 +28,7 @@
 #include <script/standard.h>
 #include <uint256.h>
 #include <util/bip32.h>
+#include <util/moneystr.h>
 #include <util/strencodings.h>
 #include <validation.h>
 #include <validationinterface.h>
@@ -1039,7 +1040,7 @@ static UniValue sendrawtransaction(const JSONRPCRequest& request)
                 "\nAlso see createrawtransaction and signrawtransactionwithkey calls.\n",
                 {
                     {"hexstring", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The hex string of the raw transaction"},
-                    {"allowhighfees", RPCArg::Type::BOOL, /* default */ "false", "Allow high fees"},
+                    {"maxfeerate", RPCArg::Type::AMOUNT, /* default */ FormatMoney(maxTxFee), "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT + "/kB\n"},
                 },
                 RPCResult{
             "\"hex\"             (string) The transaction hash in hex\n"
@@ -1056,7 +1057,10 @@ static UniValue sendrawtransaction(const JSONRPCRequest& request)
                 },
             }.ToString());
 
-    RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VBOOL});
+    RPCTypeCheck(request.params, {
+        UniValue::VSTR,
+        UniValueType(), // NUM or BOOL, checked later
+    });
 
     // parse hex string from parameter
     CMutableTransaction mtx;
@@ -1064,12 +1068,24 @@ static UniValue sendrawtransaction(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed");
     CTransactionRef tx(MakeTransactionRef(std::move(mtx)));
 
-    bool allowhighfees = false;
-    if (!request.params[1].isNull()) allowhighfees = request.params[1].get_bool();
-    const CAmount highfee{allowhighfees ? 0 : ::maxTxFee};
+    CAmount max_raw_tx_fee = maxTxFee;
+    // TODO: temporary migration code for old clients. Remove in v0.20
+    if (request.params[1].isBool()) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Second argument must be numeric (maxfeerate) and no longer supports a boolean. To allow a transaction with high fees, set maxfeerate to 0.");
+    } else if (request.params[1].isNum()) {
+        size_t weight = GetTransactionWeight(*tx);
+        CFeeRate fr(AmountFromValue(request.params[1]));
+        // the +3/4 part rounds the value up, and is the same formula used when
+        // calculating the fee for a transaction
+        // (see GetVirtualTransactionSize)
+        max_raw_tx_fee = fr.GetFee((weight+3)/4);
+    } else if (!request.params[1].isNull()) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "second argument (maxfeerate) must be numeric");
+    }
+
     uint256 txid;
     std::string err_string;
-    const TransactionError err = BroadcastTransaction(tx, txid, err_string, highfee);
+    const TransactionError err = BroadcastTransaction(tx, txid, err_string, max_raw_tx_fee);
     if (TransactionError::OK != err) {
         throw JSONRPCTransactionError(err, err_string);
     }
@@ -2048,7 +2064,7 @@ static const CRPCCommand commands[] =
     { "rawtransactions",    "createrawtransaction",         &createrawtransaction,      {"inputs","outputs","locktime","replaceable"} },
     { "rawtransactions",    "decoderawtransaction",         &decoderawtransaction,      {"hexstring","iswitness"} },
     { "rawtransactions",    "decodescript",                 &decodescript,              {"hexstring"} },
-    { "rawtransactions",    "sendrawtransaction",           &sendrawtransaction,        {"hexstring","allowhighfees"} },
+    { "rawtransactions",    "sendrawtransaction",           &sendrawtransaction,        {"hexstring","allowhighfees|maxfeerate"} },
     { "rawtransactions",    "combinerawtransaction",        &combinerawtransaction,     {"txs"} },
     { "hidden",             "signrawtransaction",           &signrawtransaction,        {"hexstring","prevtxs","privkeys","sighashtype"} },
     { "rawtransactions",    "signrawtransactionwithkey",    &signrawtransactionwithkey, {"hexstring","privkeys","prevtxs","sighashtype"} },
diff --git a/src/validation.cpp b/src/validation.cpp
index 358992b74..e407c082b 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3130,6 +3130,26 @@ static int GetWitnessCommitmentIndex(const CBlock& block)
     return commitpos;
 }
 
+// Compute at which vout of the block's coinbase transaction the signet
+// signature occurs, or -1 if not found.
+static int GetSignetSignatureIndex(const CBlock& block)
+{
+    if (!block.vtx.empty()) {
+        for (size_t o = 0; o < block.vtx[0]->vout.size(); o++) {
+            if (block.vtx[0]->vout[o].scriptPubKey.size() >= 68     // at minimum 64 byte signature plus script/header data
+             && block.vtx[0]->vout[o].scriptPubKey[0] == OP_RETURN  // unspendable
+             && block.vtx[0]->vout[o].scriptPubKey[1] == block.vtx[0]->vout[o].scriptPubKey.size() - 1 // push the rest
+             && block.vtx[0]->vout[o].scriptPubKey[2] == 0xec       // 's' ^ 0x9f
+             && block.vtx[0]->vout[o].scriptPubKey[3] == 0xc7       // 'i' ^ 0xae
+             && block.vtx[0]->vout[o].scriptPubKey[4] == 0xda       // 'g' ^ 0xbd
+             && block.vtx[0]->vout[o].scriptPubKey[5] == 0xa2) {    // 'n' ^ 0xcc
+                return (int)o;
+            }
+        }
+    }
+    return -1;
+}
+
 void UpdateUncommittedBlockStructures(CBlock& block, const CBlockIndex* pindexPrev, const Consensus::Params& consensusParams)
 {
     int commitpos = GetWitnessCommitmentIndex(block);
diff --git a/test/functional/feature_fee_estimation.py b/test/functional/feature_fee_estimation.py
index b68e46adb..28c15c269 100755
--- a/test/functional/feature_fee_estimation.py
+++ b/test/functional/feature_fee_estimation.py
@@ -65,7 +65,7 @@ def small_txpuzzle_randfee(from_node, conflist, unconflist, amount, min_fee, fee
     # the ScriptSig that will satisfy the ScriptPubKey.
     for inp in tx.vin:
         inp.scriptSig = SCRIPT_SIG[inp.prevout.n]
-    txid = from_node.sendrawtransaction(ToHex(tx), True)
+    txid = from_node.sendrawtransaction(hexstring=ToHex(tx), maxfeerate=0)
     unconflist.append({"txid": txid, "vout": 0, "amount": total_in - amount - fee})
     unconflist.append({"txid": txid, "vout": 1, "amount": amount})
 
@@ -95,7 +95,7 @@ def split_inputs(from_node, txins, txouts, initial_split=False):
     else:
         tx.vin[0].scriptSig = SCRIPT_SIG[prevtxout["vout"]]
         completetx = ToHex(tx)
-    txid = from_node.sendrawtransaction(completetx, True)
+    txid = from_node.sendrawtransaction(hexstring=completetx, maxfeerate=0)
     txouts.append({"txid": txid, "vout": 0, "amount": half_change})
     txouts.append({"txid": txid, "vout": 1, "amount": rem_change})
 
diff --git a/test/functional/feature_nulldummy.py b/test/functional/feature_nulldummy.py
index e5d2f8dc4..a56c983cc 100755
--- a/test/functional/feature_nulldummy.py
+++ b/test/functional/feature_nulldummy.py
@@ -64,17 +64,17 @@ class NULLDUMMYTest(BitcoinTestFramework):
 
         self.log.info("Test 1: NULLDUMMY compliant base transactions should be accepted to mempool and mined before activation [430]")
         test1txs = [create_transaction(self.nodes[0], coinbase_txid[0], self.ms_address, amount=49)]
-        txid1 = self.nodes[0].sendrawtransaction(test1txs[0].serialize_with_witness().hex(), True)
+        txid1 = self.nodes[0].sendrawtransaction(test1txs[0].serialize_with_witness().hex(), 0)
         test1txs.append(create_transaction(self.nodes[0], txid1, self.ms_address, amount=48))
-        txid2 = self.nodes[0].sendrawtransaction(test1txs[1].serialize_with_witness().hex(), True)
+        txid2 = self.nodes[0].sendrawtransaction(test1txs[1].serialize_with_witness().hex(), 0)
         test1txs.append(create_transaction(self.nodes[0], coinbase_txid[1], self.wit_ms_address, amount=49))
-        txid3 = self.nodes[0].sendrawtransaction(test1txs[2].serialize_with_witness().hex(), True)
+        txid3 = self.nodes[0].sendrawtransaction(test1txs[2].serialize_with_witness().hex(), 0)
         self.block_submit(self.nodes[0], test1txs, False, True)
 
         self.log.info("Test 2: Non-NULLDUMMY base multisig transaction should not be accepted to mempool before activation")
         test2tx = create_transaction(self.nodes[0], txid2, self.ms_address, amount=47)
         trueDummy(test2tx)
-        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test2tx.serialize_with_witness().hex(), True)
+        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test2tx.serialize_with_witness().hex(), 0)
 
         self.log.info("Test 3: Non-NULLDUMMY base transactions should be accepted in a block before activation [431]")
         self.block_submit(self.nodes[0], [test2tx], False, True)
@@ -83,19 +83,19 @@ class NULLDUMMYTest(BitcoinTestFramework):
         test4tx = create_transaction(self.nodes[0], test2tx.hash, self.address, amount=46)
         test6txs = [CTransaction(test4tx)]
         trueDummy(test4tx)
-        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test4tx.serialize_with_witness().hex(), True)
+        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test4tx.serialize_with_witness().hex(), 0)
         self.block_submit(self.nodes[0], [test4tx])
 
         self.log.info("Test 5: Non-NULLDUMMY P2WSH multisig transaction invalid after activation")
         test5tx = create_transaction(self.nodes[0], txid3, self.wit_address, amount=48)
         test6txs.append(CTransaction(test5tx))
         test5tx.wit.vtxinwit[0].scriptWitness.stack[0] = b'\x01'
-        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test5tx.serialize_with_witness().hex(), True)
+        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test5tx.serialize_with_witness().hex(), 0)
         self.block_submit(self.nodes[0], [test5tx], True)
 
         self.log.info("Test 6: NULLDUMMY compliant base/witness transactions should be accepted to mempool and in block after activation [432]")
         for i in test6txs:
-            self.nodes[0].sendrawtransaction(i.serialize_with_witness().hex(), True)
+            self.nodes[0].sendrawtransaction(i.serialize_with_witness().hex(), 0)
         self.block_submit(self.nodes[0], test6txs, True, True)
 
     def block_submit(self, node, txs, witness=False, accept=False):
diff --git a/test/functional/feature_rbf.py b/test/functional/feature_rbf.py
index a9c7226e4..ccba547a1 100755
--- a/test/functional/feature_rbf.py
+++ b/test/functional/feature_rbf.py
@@ -46,7 +46,7 @@ def make_utxo(node, amount, confirmed=True, scriptPubKey=CScript([1])):
 
     signed_tx = node.signrawtransactionwithwallet(txToHex(tx2))
 
-    txid = node.sendrawtransaction(signed_tx['hex'], True)
+    txid = node.sendrawtransaction(signed_tx['hex'], 0)
 
     # If requested, ensure txouts are confirmed.
     if confirmed:
@@ -136,7 +136,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         tx1a.vout = [CTxOut(1 * COIN, CScript([b'a' * 35]))]
         tx1a_hex = txToHex(tx1a)
-        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, True)
+        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, 0)
 
         self.sync_all()
 
@@ -147,9 +147,9 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1b_hex = txToHex(tx1b)
 
         # This will raise an exception due to insufficient fee
-        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, 0)
         # This will raise an exception due to transaction replacement being disabled
-        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[1].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[1].sendrawtransaction, tx1b_hex, 0)
 
         # Extra 0.1 BTC fee
         tx1b = CTransaction()
@@ -157,9 +157,9 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1b.vout = [CTxOut(int(0.9 * COIN), CScript([b'b' * 35]))]
         tx1b_hex = txToHex(tx1b)
         # Replacement still disabled even with "enough fee"
-        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[1].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[1].sendrawtransaction, tx1b_hex, 0)
         # Works when enabled
-        tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, True)
+        tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, 0)
 
         mempool = self.nodes[0].getrawmempool()
 
@@ -188,7 +188,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
             tx.vin = [CTxIn(prevout, nSequence=0)]
             tx.vout = [CTxOut(remaining_value, CScript([1, OP_DROP] * 15 + [1]))]
             tx_hex = txToHex(tx)
-            txid = self.nodes[0].sendrawtransaction(tx_hex, True)
+            txid = self.nodes[0].sendrawtransaction(tx_hex, 0)
             chain_txids.append(txid)
             prevout = COutPoint(int(txid, 16), 0)
 
@@ -200,14 +200,14 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         dbl_tx_hex = txToHex(dbl_tx)
 
         # This will raise an exception due to insufficient fee
-        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, 0)
 
         # Accepted with sufficient fee
         dbl_tx = CTransaction()
         dbl_tx.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         dbl_tx.vout = [CTxOut(1 * COIN, CScript([1] * 35))]
         dbl_tx_hex = txToHex(dbl_tx)
-        self.nodes[0].sendrawtransaction(dbl_tx_hex, True)
+        self.nodes[0].sendrawtransaction(dbl_tx_hex, 0)
 
         mempool = self.nodes[0].getrawmempool()
         for doublespent_txid in chain_txids:
@@ -237,7 +237,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
             tx_hex = txToHex(tx)
 
             assert len(tx.serialize()) < 100000
-            txid = self.nodes[0].sendrawtransaction(tx_hex, True)
+            txid = self.nodes[0].sendrawtransaction(tx_hex, 0)
             yield tx
             _total_txs[0] += 1
 
@@ -261,14 +261,14 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         dbl_tx.vout = [CTxOut(initial_nValue - fee * n, CScript([1] * 35))]
         dbl_tx_hex = txToHex(dbl_tx)
         # This will raise an exception due to insufficient fee
-        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, 0)
 
         # 1 BTC fee is enough
         dbl_tx = CTransaction()
         dbl_tx.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         dbl_tx.vout = [CTxOut(initial_nValue - fee * n - 1 * COIN, CScript([1] * 35))]
         dbl_tx_hex = txToHex(dbl_tx)
-        self.nodes[0].sendrawtransaction(dbl_tx_hex, True)
+        self.nodes[0].sendrawtransaction(dbl_tx_hex, 0)
 
         mempool = self.nodes[0].getrawmempool()
 
@@ -289,7 +289,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
             dbl_tx.vout = [CTxOut(initial_nValue - 2 * fee * n, CScript([1] * 35))]
             dbl_tx_hex = txToHex(dbl_tx)
             # This will raise an exception
-            assert_raises_rpc_error(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, dbl_tx_hex, True)
+            assert_raises_rpc_error(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, dbl_tx_hex, 0)
 
             for tx in tree_txs:
                 tx.rehash()
@@ -303,7 +303,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         tx1a.vout = [CTxOut(1 * COIN, CScript([b'a' * 35]))]
         tx1a_hex = txToHex(tx1a)
-        self.nodes[0].sendrawtransaction(tx1a_hex, True)
+        self.nodes[0].sendrawtransaction(tx1a_hex, 0)
 
         # Higher fee, but the fee per KB is much lower, so the replacement is
         # rejected.
@@ -313,7 +313,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1b_hex = txToHex(tx1b)
 
         # This will raise an exception due to insufficient fee
-        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, 0)
 
     def test_spends_of_conflicting_outputs(self):
         """Replacements that spend conflicting tx outputs are rejected"""
@@ -324,7 +324,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1a.vin = [CTxIn(utxo1, nSequence=0)]
         tx1a.vout = [CTxOut(int(1.1 * COIN), CScript([b'a' * 35]))]
         tx1a_hex = txToHex(tx1a)
-        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, True)
+        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, 0)
 
         tx1a_txid = int(tx1a_txid, 16)
 
@@ -336,14 +336,14 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx2_hex = txToHex(tx2)
 
         # This will raise an exception
-        assert_raises_rpc_error(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, True)
+        assert_raises_rpc_error(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, 0)
 
         # Spend tx1a's output to test the indirect case.
         tx1b = CTransaction()
         tx1b.vin = [CTxIn(COutPoint(tx1a_txid, 0), nSequence=0)]
         tx1b.vout = [CTxOut(1 * COIN, CScript([b'a' * 35]))]
         tx1b_hex = txToHex(tx1b)
-        tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, True)
+        tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, 0)
         tx1b_txid = int(tx1b_txid, 16)
 
         tx2 = CTransaction()
@@ -353,7 +353,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx2_hex = txToHex(tx2)
 
         # This will raise an exception
-        assert_raises_rpc_error(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, True)
+        assert_raises_rpc_error(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, 0)
 
     def test_new_unconfirmed_inputs(self):
         """Replacements that add new unconfirmed inputs are rejected"""
@@ -364,7 +364,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1.vin = [CTxIn(confirmed_utxo)]
         tx1.vout = [CTxOut(1 * COIN, CScript([b'a' * 35]))]
         tx1_hex = txToHex(tx1)
-        self.nodes[0].sendrawtransaction(tx1_hex, True)
+        self.nodes[0].sendrawtransaction(tx1_hex, 0)
 
         tx2 = CTransaction()
         tx2.vin = [CTxIn(confirmed_utxo), CTxIn(unconfirmed_utxo)]
@@ -372,7 +372,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx2_hex = txToHex(tx2)
 
         # This will raise an exception
-        assert_raises_rpc_error(-26, "replacement-adds-unconfirmed", self.nodes[0].sendrawtransaction, tx2_hex, True)
+        assert_raises_rpc_error(-26, "replacement-adds-unconfirmed", self.nodes[0].sendrawtransaction, tx2_hex, 0)
 
     def test_too_many_replacements(self):
         """Replacements that evict too many transactions are rejected"""
@@ -394,7 +394,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         splitting_tx.vout = outputs
         splitting_tx_hex = txToHex(splitting_tx)
 
-        txid = self.nodes[0].sendrawtransaction(splitting_tx_hex, True)
+        txid = self.nodes[0].sendrawtransaction(splitting_tx_hex, 0)
         txid = int(txid, 16)
 
         # Now spend each of those outputs individually
@@ -403,7 +403,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
             tx_i.vin = [CTxIn(COutPoint(txid, i), nSequence=0)]
             tx_i.vout = [CTxOut(split_value - fee, CScript([b'a' * 35]))]
             tx_i_hex = txToHex(tx_i)
-            self.nodes[0].sendrawtransaction(tx_i_hex, True)
+            self.nodes[0].sendrawtransaction(tx_i_hex, 0)
 
         # Now create doublespend of the whole lot; should fail.
         # Need a big enough fee to cover all spending transactions and have
@@ -418,14 +418,14 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         double_tx_hex = txToHex(double_tx)
 
         # This will raise an exception
-        assert_raises_rpc_error(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, double_tx_hex, True)
+        assert_raises_rpc_error(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, double_tx_hex, 0)
 
         # If we remove an input, it should pass
         double_tx = CTransaction()
         double_tx.vin = inputs[0:-1]
         double_tx.vout = [CTxOut(double_spend_value, CScript([b'a']))]
         double_tx_hex = txToHex(double_tx)
-        self.nodes[0].sendrawtransaction(double_tx_hex, True)
+        self.nodes[0].sendrawtransaction(double_tx_hex, 0)
 
     def test_opt_in(self):
         """Replacing should only work if orig tx opted in"""
@@ -436,7 +436,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0xffffffff)]
         tx1a.vout = [CTxOut(1 * COIN, CScript([b'a' * 35]))]
         tx1a_hex = txToHex(tx1a)
-        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, True)
+        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, 0)
 
         # This transaction isn't shown as replaceable
         assert_equal(self.nodes[0].getmempoolentry(tx1a_txid)['bip125-replaceable'], False)
@@ -448,7 +448,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1b_hex = txToHex(tx1b)
 
         # This will raise an exception
-        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx1b_hex, 0)
 
         tx1_outpoint = make_utxo(self.nodes[0], int(1.1*COIN))
 
@@ -457,7 +457,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx2a.vin = [CTxIn(tx1_outpoint, nSequence=0xfffffffe)]
         tx2a.vout = [CTxOut(1 * COIN, CScript([b'a' * 35]))]
         tx2a_hex = txToHex(tx2a)
-        tx2a_txid = self.nodes[0].sendrawtransaction(tx2a_hex, True)
+        tx2a_txid = self.nodes[0].sendrawtransaction(tx2a_hex, 0)
 
         # Still shouldn't be able to double-spend
         tx2b = CTransaction()
@@ -466,7 +466,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx2b_hex = txToHex(tx2b)
 
         # This will raise an exception
-        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx2b_hex, True)
+        assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx2b_hex, 0)
 
         # Now create a new transaction that spends from tx1a and tx2a
         # opt-in on one of the inputs
@@ -481,7 +481,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx3a.vout = [CTxOut(int(0.9*COIN), CScript([b'c'])), CTxOut(int(0.9*COIN), CScript([b'd']))]
         tx3a_hex = txToHex(tx3a)
 
-        tx3a_txid = self.nodes[0].sendrawtransaction(tx3a_hex, True)
+        tx3a_txid = self.nodes[0].sendrawtransaction(tx3a_hex, 0)
 
         # This transaction is shown as replaceable
         assert_equal(self.nodes[0].getmempoolentry(tx3a_txid)['bip125-replaceable'], True)
@@ -496,10 +496,10 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx3c.vout = [CTxOut(int(0.5 * COIN), CScript([b'f' * 35]))]
         tx3c_hex = txToHex(tx3c)
 
-        self.nodes[0].sendrawtransaction(tx3b_hex, True)
+        self.nodes[0].sendrawtransaction(tx3b_hex, 0)
         # If tx3b was accepted, tx3c won't look like a replacement,
         # but make sure it is accepted anyway
-        self.nodes[0].sendrawtransaction(tx3c_hex, True)
+        self.nodes[0].sendrawtransaction(tx3c_hex, 0)
 
     def test_prioritised_transactions(self):
         # Ensure that fee deltas used via prioritisetransaction are
@@ -512,7 +512,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0)]
         tx1a.vout = [CTxOut(1 * COIN, CScript([b'a' * 35]))]
         tx1a_hex = txToHex(tx1a)
-        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, True)
+        tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, 0)
 
         # Higher fee, but the actual fee per KB is much lower.
         tx1b = CTransaction()
@@ -521,13 +521,13 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx1b_hex = txToHex(tx1b)
 
         # Verify tx1b cannot replace tx1a.
-        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, 0)
 
         # Use prioritisetransaction to set tx1a's fee to 0.
         self.nodes[0].prioritisetransaction(txid=tx1a_txid, fee_delta=int(-0.1*COIN))
 
         # Now tx1b should be able to replace tx1a
-        tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, True)
+        tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, 0)
 
         assert tx1b_txid in self.nodes[0].getrawmempool()
 
@@ -538,7 +538,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx2a.vin = [CTxIn(tx1_outpoint, nSequence=0)]
         tx2a.vout = [CTxOut(1 * COIN, CScript([b'a' * 35]))]
         tx2a_hex = txToHex(tx2a)
-        self.nodes[0].sendrawtransaction(tx2a_hex, True)
+        self.nodes[0].sendrawtransaction(tx2a_hex, 0)
 
         # Lower fee, but we'll prioritise it
         tx2b = CTransaction()
@@ -548,13 +548,13 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         tx2b_hex = txToHex(tx2b)
 
         # Verify tx2b cannot replace tx2a.
-        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx2b_hex, True)
+        assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx2b_hex, 0)
 
         # Now prioritise tx2b to have a higher modified fee
         self.nodes[0].prioritisetransaction(txid=tx2b.hash, fee_delta=int(0.1*COIN))
 
         # tx2b should now be accepted
-        tx2b_txid = self.nodes[0].sendrawtransaction(tx2b_hex, True)
+        tx2b_txid = self.nodes[0].sendrawtransaction(tx2b_hex, 0)
 
         assert tx2b_txid in self.nodes[0].getrawmempool()
 
diff --git a/test/functional/feature_segwit.py b/test/functional/feature_segwit.py
index 0128af8b6..226a7dc63 100755
--- a/test/functional/feature_segwit.py
+++ b/test/functional/feature_segwit.py
@@ -536,7 +536,7 @@ class SegWitTest(BitcoinTestFramework):
             tx.vout.append(CTxOut(10000000, i))
         tx.rehash()
         signresults = self.nodes[0].signrawtransactionwithwallet(tx.serialize_without_witness().hex())['hex']
-        txid = self.nodes[0].sendrawtransaction(signresults, True)
+        txid = self.nodes[0].sendrawtransaction(signresults, 0)
         txs_mined[txid] = self.nodes[0].generate(1)[0]
         sync_blocks(self.nodes)
         watchcount = 0
@@ -588,7 +588,7 @@ class SegWitTest(BitcoinTestFramework):
         tx.vout.append(CTxOut(0, CScript()))
         tx.rehash()
         signresults = self.nodes[0].signrawtransactionwithwallet(tx.serialize_without_witness().hex())['hex']
-        self.nodes[0].sendrawtransaction(signresults, True)
+        self.nodes[0].sendrawtransaction(signresults, 0)
         self.nodes[0].generate(1)
         sync_blocks(self.nodes)
 
diff --git a/test/functional/mempool_accept.py b/test/functional/mempool_accept.py
index fc8111905..2bb5d8ab7 100755
--- a/test/functional/mempool_accept.py
+++ b/test/functional/mempool_accept.py
@@ -68,7 +68,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
             inputs=[{'txid': coin['txid'], 'vout': coin['vout']}],
             outputs=[{node.getnewaddress(): 0.3}, {node.getnewaddress(): 49}],
         ))['hex']
-        txid_in_block = node.sendrawtransaction(hexstring=raw_tx_in_block, allowhighfees=True)
+        txid_in_block = node.sendrawtransaction(hexstring=raw_tx_in_block, maxfeerate=0)
         node.generate(1)
         self.mempool_size = 0
         self.check_mempool_result(
@@ -101,9 +101,9 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(), 'allowed': True}],
             rawtxs=[tx.serialize().hex()],
-            allowhighfees=True,
+            maxfeerate=0,
         )
-        node.sendrawtransaction(hexstring=raw_tx_final, allowhighfees=True)
+        node.sendrawtransaction(hexstring=raw_tx_final, maxfeerate=0)
         self.mempool_size += 1
 
         self.log.info('A transaction in the mempool')
@@ -128,7 +128,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
 
         self.log.info('A transaction that conflicts with an unconfirmed tx')
         # Send the transaction that replaces the mempool transaction and opts out of replaceability
-        node.sendrawtransaction(hexstring=tx.serialize().hex(), allowhighfees=True)
+        node.sendrawtransaction(hexstring=tx.serialize().hex(), maxfeerate=0)
         # take original raw_tx_0
         tx.deserialize(BytesIO(hex_str_to_bytes(raw_tx_0)))
         tx.vout[0].nValue -= int(4 * fee * COIN)  # Set more fee
@@ -136,7 +136,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(), 'allowed': False, 'reject-reason': '18: txn-mempool-conflict'}],
             rawtxs=[tx.serialize().hex()],
-            allowhighfees=True,
+            maxfeerate=0,
         )
 
         self.log.info('A transaction with missing inputs, that never existed')
@@ -152,7 +152,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         tx.deserialize(BytesIO(hex_str_to_bytes(raw_tx_0)))
         tx.vin[0].prevout.n = 1  # Set vout to 1, to spend the other outpoint (49 coins) of the in-chain-tx we want to double spend
         raw_tx_1 = node.signrawtransactionwithwallet(tx.serialize().hex())['hex']
-        txid_1 = node.sendrawtransaction(hexstring=raw_tx_1, allowhighfees=True)
+        txid_1 = node.sendrawtransaction(hexstring=raw_tx_1, maxfeerate=0)
         # Now spend both to "clearly hide" the outputs, ie. remove the coins from the utxo set by spending them
         raw_tx_spend_both = node.signrawtransactionwithwallet(node.createrawtransaction(
             inputs=[
@@ -161,7 +161,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
             ],
             outputs=[{node.getnewaddress(): 0.1}]
         ))['hex']
-        txid_spend_both = node.sendrawtransaction(hexstring=raw_tx_spend_both, allowhighfees=True)
+        txid_spend_both = node.sendrawtransaction(hexstring=raw_tx_spend_both, maxfeerate=0)
         node.generate(1)
         self.mempool_size = 0
         # Now see if we can add the coins back to the utxo set by sending the exact txs again
@@ -304,7 +304,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(), 'allowed': False, 'reject-reason': '64: non-BIP68-final'}],
             rawtxs=[tx.serialize().hex()],
-            allowhighfees=True,
+            maxfeerate=0,
         )
 
 
diff --git a/test/functional/rpc_createmultisig.py b/test/functional/rpc_createmultisig.py
index 3cc35a7b9..17dbf59a8 100755
--- a/test/functional/rpc_createmultisig.py
+++ b/test/functional/rpc_createmultisig.py
@@ -90,7 +90,7 @@ class RpcCreateMultiSigTest(BitcoinTestFramework):
         rawtx3 = node2.signrawtransactionwithkey(rawtx2["hex"], [self.priv[-1]], prevtxs)
 
         self.moved += outval
-        tx = node0.sendrawtransaction(rawtx3["hex"], True)
+        tx = node0.sendrawtransaction(rawtx3["hex"], 0)
         blk = node0.generate(1)[0]
         assert tx in node0.getblock(blk)["tx"]
 
diff --git a/test/functional/rpc_rawtransaction.py b/test/functional/rpc_rawtransaction.py
index df7c89482..a5a563335 100755
--- a/test/functional/rpc_rawtransaction.py
+++ b/test/functional/rpc_rawtransaction.py
@@ -426,5 +426,24 @@ class RawTransactionsTest(BitcoinTestFramework):
         decrawtx = self.nodes[0].decoderawtransaction(rawtx)
         assert_equal(decrawtx['version'], 0x7fffffff)
 
+        self.log.info('sendrawtransaction with maxfeerate')
+
+        txId = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), 1.0)
+        rawTx = self.nodes[0].getrawtransaction(txId, True)
+        vout = next(o for o in rawTx['vout'] if o['value'] == Decimal('1.00000000'))
+
+        self.sync_all()
+        inputs = [{ "txid" : txId, "vout" : vout['n'] }]
+        outputs = { self.nodes[0].getnewaddress() : Decimal("0.99999000") } # 1000 sat fee
+        rawTx = self.nodes[2].createrawtransaction(inputs, outputs)
+        rawTxSigned = self.nodes[2].signrawtransactionwithwallet(rawTx)
+        assert_equal(rawTxSigned['complete'], True)
+        # 1000 sat fee, ~200 b transaction, fee rate should land around 5 sat/b = 0.00005000 BTC/kB
+        # Thus, below call should fail
+        assert_raises_rpc_error(-26, "absurdly-high-fee", self.nodes[2].sendrawtransaction, rawTxSigned['hex'], 0.00001000)
+        # And below call should succeed
+        self.nodes[2].sendrawtransaction(hexstring=rawTxSigned['hex'], maxfeerate=0.00007000)
+
+
 if __name__ == '__main__':
     RawTransactionsTest().main()
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 034ed893f..f771a37b9 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -467,7 +467,7 @@ def random_transaction(nodes, amount, min_fee, fee_increment, fee_variants):
 
     rawtx = from_node.createrawtransaction(inputs, outputs)
     signresult = from_node.signrawtransactionwithwallet(rawtx)
-    txid = from_node.sendrawtransaction(signresult["hex"], True)
+    txid = from_node.sendrawtransaction(signresult["hex"], 0)
 
     return (txid, signresult["hex"], fee)
 
@@ -539,7 +539,7 @@ def create_lots_of_big_transactions(node, txouts, utxos, num, fee):
         newtx = newtx + txouts
         newtx = newtx + rawtx[94:]
         signresult = node.signrawtransactionwithwallet(newtx, None, "NONE")
-        txid = node.sendrawtransaction(signresult["hex"], True)
+        txid = node.sendrawtransaction(signresult["hex"], 0)
         txids.append(txid)
     return txids
 
diff --git a/test/functional/wallet_basic.py b/test/functional/wallet_basic.py
index 0477164b6..b7be605f6 100755
--- a/test/functional/wallet_basic.py
+++ b/test/functional/wallet_basic.py
@@ -168,8 +168,8 @@ class WalletTest(BitcoinTestFramework):
             txns_to_send.append(self.nodes[0].signrawtransactionwithwallet(raw_tx))
 
         # Have node 1 (miner) send the transactions
-        self.nodes[1].sendrawtransaction(txns_to_send[0]["hex"], True)
-        self.nodes[1].sendrawtransaction(txns_to_send[1]["hex"], True)
+        self.nodes[1].sendrawtransaction(txns_to_send[0]["hex"], 0)
+        self.nodes[1].sendrawtransaction(txns_to_send[1]["hex"], 0)
 
         # Have node1 mine a block to confirm transactions:
         self.nodes[1].generate(1)
diff --git a/test/functional/wallet_listtransactions.py b/test/functional/wallet_listtransactions.py
index f8268fab3..83f7ee6a9 100755
--- a/test/functional/wallet_listtransactions.py
+++ b/test/functional/wallet_listtransactions.py
@@ -185,7 +185,7 @@ class ListTransactionsTest(BitcoinTestFramework):
         tx3_b.vout[0].nValue -= int(Decimal("0.004") * COIN)  # bump the fee
         tx3_b = tx3_b.serialize().hex()
         tx3_b_signed = self.nodes[0].signrawtransactionwithwallet(tx3_b)['hex']
-        txid_3b = self.nodes[0].sendrawtransaction(tx3_b_signed, True)
+        txid_3b = self.nodes[0].sendrawtransaction(tx3_b_signed, 0)
         assert is_opt_in(self.nodes[0], txid_3b)
 
         assert_array_result(self.nodes[0].listtransactions(), {"txid": txid_4}, {"bip125-replaceable": "unknown"})