Merge #12909: wallet: Make fee settings to be non-static members

fac0db0 wallet: Make fee settings non-static members (MarcoFalke)

Pull request description:

  The wallet header defined some globals (they were called "settings"), that should be class members instead.

  This commit is hopefully only refactoring, apart from a multiwallet bugfix: Calling the rpc `settxfee` for one wallet, would set (and change) the fee rate for all loaded wallets. (See added test case)

Tree-SHA512: 4ab6ec2f5c714742396ded5e451ec3b1ceb771e3696492de29889d866de4365b3fbe4a2784d085c8b8bd11b1ebb8a1fec99ab2c62eee716791cfc67c0cf29e1b

15 files changed, 179 insertions, 187 deletions

diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index e55cba3c65..55786c807f 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -191,20 +191,6 @@ class NodeImpl : public Node
         }
     }
     bool getNetworkActive() override { return g_connman && g_connman->GetNetworkActive(); }
-    unsigned int getTxConfirmTarget() override { CHECK_WALLET(return ::nTxConfirmTarget); }
-    CAmount getRequiredFee(unsigned int tx_bytes) override { CHECK_WALLET(return GetRequiredFee(tx_bytes)); }
-    CAmount getMinimumFee(unsigned int tx_bytes,
-        const CCoinControl& coin_control,
-        int* returned_target,
-        FeeReason* reason) override
-    {
-        FeeCalculation fee_calc;
-        CAmount result;
-        CHECK_WALLET(result = GetMinimumFee(tx_bytes, coin_control, ::mempool, ::feeEstimator, &fee_calc));
-        if (returned_target) *returned_target = fee_calc.returnedTarget;
-        if (reason) *reason = fee_calc.reason;
-        return result;
-    }
     CAmount getMaxTxFee() override { return ::maxTxFee; }
     CFeeRate estimateSmartFee(int num_blocks, bool conservative, int* returned_target = nullptr) override
     {
diff --git a/src/interfaces/node.h b/src/interfaces/node.h
index 84e869100a..3cebe53eb0 100644
--- a/src/interfaces/node.h
+++ b/src/interfaces/node.h
@@ -26,11 +26,9 @@ class Coin;
 class RPCTimerInterface;
 class UniValue;
 class proxyType;
-enum class FeeReason;
 struct CNodeStateStats;
 
 namespace interfaces {
-
 class Handler;
 class Wallet;
 
@@ -152,18 +150,6 @@ public:
     //! Get network active.
     virtual bool getNetworkActive() = 0;
 
-    //! Get tx confirm target.
-    virtual unsigned int getTxConfirmTarget() = 0;
-
-    //! Get required fee.
-    virtual CAmount getRequiredFee(unsigned int tx_bytes) = 0;
-
-    //! Get minimum fee.
-    virtual CAmount getMinimumFee(unsigned int tx_bytes,
-        const CCoinControl& coin_control,
-        int* returned_target,
-        FeeReason* reason) = 0;
-
     //! Get max tx fee.
     virtual CAmount getMaxTxFee() = 0;
 
diff --git a/src/interfaces/wallet.cpp b/src/interfaces/wallet.cpp
index 3e6f0d6728..f4dfdae8ae 100644
--- a/src/interfaces/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -9,6 +9,8 @@
 #include <consensus/validation.h>
 #include <interfaces/handler.h>
 #include <net.h>
+#include <policy/feerate.h>
+#include <policy/fees.h>
 #include <policy/policy.h>
 #include <primitives/transaction.h>
 #include <script/ismine.h>
@@ -20,6 +22,7 @@
 #include <uint256.h>
 #include <validation.h>
 #include <wallet/feebumper.h>
+#include <wallet/fees.h>
 #include <wallet/wallet.h>
 
 namespace interfaces {
@@ -403,6 +406,20 @@ public:
         }
         return result;
     }
+    CAmount getRequiredFee(unsigned int tx_bytes) override { return GetRequiredFee(m_wallet, tx_bytes); }
+    CAmount getMinimumFee(unsigned int tx_bytes,
+        const CCoinControl& coin_control,
+        int* returned_target,
+        FeeReason* reason) override
+    {
+        FeeCalculation fee_calc;
+        CAmount result;
+        result = GetMinimumFee(m_wallet, tx_bytes, coin_control, ::mempool, ::feeEstimator, &fee_calc);
+        if (returned_target) *returned_target = fee_calc.returnedTarget;
+        if (reason) *reason = fee_calc.reason;
+        return result;
+    }
+    unsigned int getConfirmTarget() override { return m_wallet.m_confirm_target; }
     bool hdEnabled() override { return m_wallet.IsHDEnabled(); }
     OutputType getDefaultAddressType() override { return m_wallet.m_default_address_type; }
     OutputType getDefaultChangeType() override { return m_wallet.m_default_change_type; }
diff --git a/src/interfaces/wallet.h b/src/interfaces/wallet.h
index 9d4830d189..2a03f6c60a 100644
--- a/src/interfaces/wallet.h
+++ b/src/interfaces/wallet.h
@@ -22,8 +22,10 @@
 #include <vector>
 
 class CCoinControl;
+class CFeeRate;
 class CKey;
 class CWallet;
+enum class FeeReason;
 enum class OutputType;
 struct CRecipient;
 
@@ -218,6 +220,18 @@ public:
     //! Return wallet transaction output information.
     virtual std::vector<WalletTxOut> getCoins(const std::vector<COutPoint>& outputs) = 0;
 
+    //! Get required fee.
+    virtual CAmount getRequiredFee(unsigned int tx_bytes) = 0;
+
+    //! Get minimum fee.
+    virtual CAmount getMinimumFee(unsigned int tx_bytes,
+        const CCoinControl& coin_control,
+        int* returned_target,
+        FeeReason* reason) = 0;
+
+    //! Get tx confirm target.
+    virtual unsigned int getConfirmTarget() = 0;
+
     // Return whether HD enabled.
     virtual bool hdEnabled() = 0;
 
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index 601a77fc85..b08de27041 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -509,7 +509,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
                 nBytes -= 34;
 
         // Fee
-        nPayFee = model->node().getMinimumFee(nBytes, *coinControl(), nullptr /* returned_target */, nullptr /* reason */);
+        nPayFee = model->wallet().getMinimumFee(nBytes, *coinControl(), nullptr /* returned_target */, nullptr /* reason */);
 
         if (nPayAmount > 0)
         {
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 0874a0ada4..261ab7a948 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -114,7 +114,7 @@ SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle, QWidget *p
     if (!settings.contains("nSmartFeeSliderPosition"))
         settings.setValue("nSmartFeeSliderPosition", 0);
     if (!settings.contains("nTransactionFee"))
-        settings.setValue("nTransactionFee", (qint64)DEFAULT_TRANSACTION_FEE);
+        settings.setValue("nTransactionFee", (qint64)DEFAULT_PAY_TX_FEE);
     if (!settings.contains("fPayOnlyMinFee"))
         settings.setValue("fPayOnlyMinFee", false);
     ui->groupFee->setId(ui->radioSmartFee, 0);
@@ -175,7 +175,7 @@ void SendCoinsDialog::setModel(WalletModel *_model)
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(coinControlUpdateLabels()));
         connect(ui->optInRBF, SIGNAL(stateChanged(int)), this, SLOT(updateSmartFeeLabel()));
         connect(ui->optInRBF, SIGNAL(stateChanged(int)), this, SLOT(coinControlUpdateLabels()));
-        ui->customFee->setSingleStep(model->node().getRequiredFee(1000));
+        ui->customFee->setSingleStep(model->wallet().getRequiredFee(1000));
         updateFeeSectionControls();
         updateMinFeeLabel();
         updateSmartFeeLabel();
@@ -193,7 +193,7 @@ void SendCoinsDialog::setModel(WalletModel *_model)
             settings.remove("nSmartFeeSliderPosition");
         }
         if (settings.value("nConfTarget").toInt() == 0)
-            ui->confTargetSelector->setCurrentIndex(getIndexForConfTarget(model->node().getTxConfirmTarget()));
+            ui->confTargetSelector->setCurrentIndex(getIndexForConfTarget(model->wallet().getConfirmTarget()));
         else
             ui->confTargetSelector->setCurrentIndex(getIndexForConfTarget(settings.value("nConfTarget").toInt()));
     }
@@ -629,7 +629,7 @@ void SendCoinsDialog::useAvailableBalance(SendCoinsEntry* entry)
 
 void SendCoinsDialog::setMinimumFee()
 {
-    ui->customFee->setValue(model->node().getRequiredFee(1000));
+    ui->customFee->setValue(model->wallet().getRequiredFee(1000));
 }
 
 void SendCoinsDialog::updateFeeSectionControls()
@@ -661,7 +661,7 @@ void SendCoinsDialog::updateMinFeeLabel()
 {
     if (model && model->getOptionsModel())
         ui->checkBoxMinimumFee->setText(tr("Pay only the required fee of %1").arg(
-            BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), model->node().getRequiredFee(1000)) + "/kB")
+            BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), model->wallet().getRequiredFee(1000)) + "/kB")
         );
 }
 
@@ -675,7 +675,7 @@ void SendCoinsDialog::updateCoinControlState(CCoinControl& ctrl)
     // Avoid using global defaults when sending money from the GUI
     // Either custom fee will be used or if not selected, the confirmation target from dropdown box
     ctrl.m_confirm_target = getConfTargetForIndex(ui->confTargetSelector->currentIndex());
-    ctrl.signalRbf = ui->optInRBF->isChecked();
+    ctrl.m_signal_bip125_rbf = ui->optInRBF->isChecked();
 }
 
 void SendCoinsDialog::updateSmartFeeLabel()
@@ -687,7 +687,7 @@ void SendCoinsDialog::updateSmartFeeLabel()
     coin_control.m_feerate.reset(); // Explicitly use only fee estimation rate for smart fee labels
     int returned_target;
     FeeReason reason;
-    CFeeRate feeRate = CFeeRate(model->node().getMinimumFee(1000, coin_control, &returned_target, &reason));
+    CFeeRate feeRate = CFeeRate(model->wallet().getMinimumFee(1000, coin_control, &returned_target, &reason));
 
     ui->labelSmartFee->setText(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), feeRate.GetFeePerK()) + "/kB");
 
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 00b98901c0..8f30a2a871 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -486,7 +486,7 @@ bool WalletModel::saveReceiveRequest(const std::string &sAddress, const int64_t
 bool WalletModel::bumpFee(uint256 hash)
 {
     CCoinControl coin_control;
-    coin_control.signalRbf = true;
+    coin_control.m_signal_bip125_rbf = true;
     std::vector<std::string> errors;
     CAmount old_fee;
     CAmount new_fee;
diff --git a/src/wallet/coincontrol.h b/src/wallet/coincontrol.h
index 52d6a291c9..2f08162ee4 100644
--- a/src/wallet/coincontrol.h
+++ b/src/wallet/coincontrol.h
@@ -26,12 +26,12 @@ public:
     bool fAllowWatchOnly;
     //! Override automatic min/max checks on fee, m_feerate must be set if true
     bool fOverrideFeeRate;
-    //! Override the default payTxFee if set
+    //! Override the wallet's m_pay_tx_fee if set
     boost::optional<CFeeRate> m_feerate;
     //! Override the default confirmation target if set
     boost::optional<unsigned int> m_confirm_target;
-    //! Signal BIP-125 replace by fee.
-    bool signalRbf;
+    //! Override the wallet's m_signal_rbf if set
+    boost::optional<bool> m_signal_bip125_rbf;
     //! Fee estimation mode to control arguments to estimateSmartFee
     FeeEstimateMode m_fee_mode;
 
@@ -50,7 +50,7 @@ public:
         m_feerate.reset();
         fOverrideFeeRate = false;
         m_confirm_target.reset();
-        signalRbf = fWalletRbf;
+        m_signal_bip125_rbf.reset();
         m_fee_mode = FeeEstimateMode::UNSET;
     }
 
diff --git a/src/wallet/feebumper.cpp b/src/wallet/feebumper.cpp
index 5c34b39ec8..4d70dde72a 100644
--- a/src/wallet/feebumper.cpp
+++ b/src/wallet/feebumper.cpp
@@ -134,7 +134,7 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
                                                                 FormatMoney(minTotalFee), FormatMoney(nOldFeeRate.GetFee(maxNewTxSize)), FormatMoney(::incrementalRelayFee.GetFee(maxNewTxSize))));
             return Result::INVALID_PARAMETER;
         }
-        CAmount requiredFee = GetRequiredFee(maxNewTxSize);
+        CAmount requiredFee = GetRequiredFee(*wallet, maxNewTxSize);
         if (total_fee < requiredFee) {
             errors.push_back(strprintf("Insufficient totalFee (cannot be less than required fee %s)",
                                                                 FormatMoney(requiredFee)));
@@ -143,7 +143,7 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
         new_fee = total_fee;
         nNewFeeRate = CFeeRate(total_fee, maxNewTxSize);
     } else {
-        new_fee = GetMinimumFee(maxNewTxSize, coin_control, mempool, ::feeEstimator, nullptr /* FeeCalculation */);
+        new_fee = GetMinimumFee(*wallet, maxNewTxSize, coin_control, mempool, ::feeEstimator, nullptr /* FeeCalculation */);
         nNewFeeRate = CFeeRate(new_fee, maxNewTxSize);
 
         // New fee rate must be at least old rate + minimum incremental relay rate
@@ -194,14 +194,14 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
 
     // If the output would become dust, discard it (converting the dust to fee)
     poutput->nValue -= nDelta;
-    if (poutput->nValue <= GetDustThreshold(*poutput, GetDiscardRate(::feeEstimator))) {
+    if (poutput->nValue <= GetDustThreshold(*poutput, GetDiscardRate(*wallet, ::feeEstimator))) {
         LogPrint(BCLog::RPC, "Bumping fee and discarding dust output\n");
         new_fee += poutput->nValue;
         mtx.vout.erase(mtx.vout.begin() + nOutput);
     }
 
     // Mark new tx not replaceable, if requested.
-    if (!coin_control.signalRbf) {
+    if (!coin_control.m_signal_bip125_rbf.get_value_or(wallet->m_signal_rbf)) {
         for (auto& input : mtx.vin) {
             if (input.nSequence < 0xfffffffe) input.nSequence = 0xfffffffe;
         }
diff --git a/src/wallet/fees.cpp b/src/wallet/fees.cpp
index 03c32d3b97..8d576a6689 100644
--- a/src/wallet/fees.cpp
+++ b/src/wallet/fees.cpp
@@ -13,15 +13,15 @@
 #include <wallet/wallet.h>
 
 
-CAmount GetRequiredFee(unsigned int nTxBytes)
+CAmount GetRequiredFee(const CWallet& wallet, unsigned int nTxBytes)
 {
-    return std::max(CWallet::minTxFee.GetFee(nTxBytes), ::minRelayTxFee.GetFee(nTxBytes));
+    return GetRequiredFeeRate(wallet).GetFee(nTxBytes);
 }
 
 
-CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc)
+CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation* feeCalc)
 {
-    CAmount fee_needed = GetMinimumFeeRate(coin_control, pool, estimator, feeCalc).GetFee(nTxBytes);
+    CAmount fee_needed = GetMinimumFeeRate(wallet, coin_control, pool, estimator, feeCalc).GetFee(nTxBytes);
     // Always obey the maximum
     if (fee_needed > maxTxFee) {
         fee_needed = maxTxFee;
@@ -30,48 +30,48 @@ CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, c
     return fee_needed;
 }
 
-CFeeRate GetRequiredFeeRate()
+CFeeRate GetRequiredFeeRate(const CWallet& wallet)
 {
-    return std::max(CWallet::minTxFee, ::minRelayTxFee);
+    return std::max(wallet.m_min_fee, ::minRelayTxFee);
 }
 
-CFeeRate GetMinimumFeeRate(const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc)
+CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation* feeCalc)
 {
     /* User control of how to calculate fee uses the following parameter precedence:
        1. coin_control.m_feerate
        2. coin_control.m_confirm_target
-       3. payTxFee (user-set global variable)
-       4. nTxConfirmTarget (user-set global variable)
+       3. m_pay_tx_fee (user-set member variable of wallet)
+       4. m_confirm_target (user-set member variable of wallet)
        The first parameter that is set is used.
     */
-    CFeeRate feerate_needed ;
+    CFeeRate feerate_needed;
     if (coin_control.m_feerate) { // 1.
         feerate_needed = *(coin_control.m_feerate);
         if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
         // Allow to override automatic min/max check over coin control instance
         if (coin_control.fOverrideFeeRate) return feerate_needed;
     }
-    else if (!coin_control.m_confirm_target && ::payTxFee != CFeeRate(0)) { // 3. TODO: remove magic value of 0 for global payTxFee
-        feerate_needed = ::payTxFee;
+    else if (!coin_control.m_confirm_target && wallet.m_pay_tx_fee != CFeeRate(0)) { // 3. TODO: remove magic value of 0 for wallet member m_pay_tx_fee
+        feerate_needed = wallet.m_pay_tx_fee;
         if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
     }
     else { // 2. or 4.
         // We will use smart fee estimation
-        unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : ::nTxConfirmTarget;
+        unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : wallet.m_confirm_target;
         // By default estimates are economical iff we are signaling opt-in-RBF
-        bool conservative_estimate = !coin_control.signalRbf;
+        bool conservative_estimate = !coin_control.m_signal_bip125_rbf.get_value_or(wallet.m_signal_rbf);
         // Allow to override the default fee estimate mode over the CoinControl instance
         if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE) conservative_estimate = true;
         else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL) conservative_estimate = false;
 
         feerate_needed = estimator.estimateSmartFee(target, feeCalc, conservative_estimate);
         if (feerate_needed == CFeeRate(0)) {
-            // if we don't have enough data for estimateSmartFee, then use fallbackFee
-            feerate_needed = CWallet::fallbackFee;
+            // if we don't have enough data for estimateSmartFee, then use fallback fee
+            feerate_needed = wallet.m_fallback_fee;
             if (feeCalc) feeCalc->reason = FeeReason::FALLBACK;
 
             // directly return if fallback fee is disabled (feerate 0 == disabled)
-            if (CWallet::fallbackFee == CFeeRate(0)) return feerate_needed;
+            if (wallet.m_fallback_fee == CFeeRate(0)) return feerate_needed;
         }
         // Obey mempool min fee when using smart fee estimation
         CFeeRate min_mempool_feerate = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
@@ -81,8 +81,8 @@ CFeeRate GetMinimumFeeRate(const CCoinControl& coin_control, const CTxMemPool& p
         }
     }
 
-    // prevent user from paying a fee below minRelayTxFee or minTxFee
-    CFeeRate required_feerate = GetRequiredFeeRate();
+    // prevent user from paying a fee below the required fee rate
+    CFeeRate required_feerate = GetRequiredFeeRate(wallet);
     if (required_feerate > feerate_needed) {
         feerate_needed = required_feerate;
         if (feeCalc) feeCalc->reason = FeeReason::REQUIRED;
@@ -90,12 +90,12 @@ CFeeRate GetMinimumFeeRate(const CCoinControl& coin_control, const CTxMemPool& p
     return feerate_needed;
 }
 
-CFeeRate GetDiscardRate(const CBlockPolicyEstimator& estimator)
+CFeeRate GetDiscardRate(const CWallet& wallet, const CBlockPolicyEstimator& estimator)
 {
     unsigned int highest_target = estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
     CFeeRate discard_rate = estimator.estimateSmartFee(highest_target, nullptr /* FeeCalculation */, 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)) ? CWallet::m_discard_rate : std::min(discard_rate, CWallet::m_discard_rate);
+    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 = std::max(discard_rate, ::dustRelayFee);
     return discard_rate;
diff --git a/src/wallet/fees.h b/src/wallet/fees.h
index a627af70b0..b3cd064abc 100644
--- a/src/wallet/fees.h
+++ b/src/wallet/fees.h
@@ -12,35 +12,36 @@ class CBlockPolicyEstimator;
 class CCoinControl;
 class CFeeRate;
 class CTxMemPool;
+class CWallet;
 struct FeeCalculation;
 
 /**
- * Return the minimum required fee taking into account the
- * floating relay fee and user set minimum transaction fee
+ * Return the minimum required absolute fee for this size
+ * based on the required fee rate
  */
-CAmount GetRequiredFee(unsigned int nTxBytes);
+CAmount GetRequiredFee(const CWallet& wallet, unsigned int nTxBytes);
 
 /**
  * Estimate the minimum fee considering user set parameters
  * and the required fee
  */
-CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc);
+CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation* feeCalc);
 
 /**
  * Return the minimum required feerate taking into account the
- * floating relay feerate and user set minimum transaction feerate
+ * minimum relay feerate and user set minimum transaction feerate
  */
-CFeeRate GetRequiredFeeRate();
+CFeeRate GetRequiredFeeRate(const CWallet& wallet);
 
 /**
  * Estimate the minimum fee rate considering user set parameters
  * and the required fee
  */
-CFeeRate GetMinimumFeeRate(const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc);
+CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation* feeCalc);
 
 /**
  * Return the maximum feerate for discarding change.
  */
-CFeeRate GetDiscardRate(const CBlockPolicyEstimator& estimator);
+CFeeRate GetDiscardRate(const CWallet& wallet, const CBlockPolicyEstimator& estimator);
 
 #endif // BITCOIN_WALLET_FEES_H
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
index 5091477dfd..06f9c730c0 100644
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -64,7 +64,7 @@ std::string WalletInit::GetHelpString(bool showDebug) const
     strUsage += HelpMessageOpt("-mintxfee=<amt>", strprintf(_("Fees (in %s/kB) smaller than this are considered zero fee for transaction creation (default: %s)"),
                                                             CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MINFEE)));
     strUsage += HelpMessageOpt("-paytxfee=<amt>", strprintf(_("Fee (in %s/kB) to add to transactions you send (default: %s)"),
-                                                            CURRENCY_UNIT, FormatMoney(payTxFee.GetFeePerK())));
+                                                            CURRENCY_UNIT, FormatMoney(CFeeRate{DEFAULT_PAY_TX_FEE}.GetFeePerK())));
     strUsage += HelpMessageOpt("-rescan", _("Rescan the block chain for missing wallet transactions on startup"));
     strUsage += HelpMessageOpt("-salvagewallet", _("Attempt to recover private keys from a corrupt wallet on startup"));
     strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), DEFAULT_SPEND_ZEROCONF_CHANGE));
@@ -149,55 +149,6 @@ bool WalletInit::ParameterInteraction() const
         InitWarning(AmountHighWarn("-minrelaytxfee") + " " +
                     _("The wallet will avoid paying less than the minimum relay fee."));
 
-    if (gArgs.IsArgSet("-mintxfee"))
-    {
-        CAmount n = 0;
-        if (!ParseMoney(gArgs.GetArg("-mintxfee", ""), n) || 0 == n)
-            return InitError(AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", "")));
-        if (n > HIGH_TX_FEE_PER_KB)
-            InitWarning(AmountHighWarn("-mintxfee") + " " +
-                        _("This is the minimum transaction fee you pay on every transaction."));
-        CWallet::minTxFee = CFeeRate(n);
-    }
-
-    g_wallet_allow_fallback_fee = Params().IsFallbackFeeEnabled();
-    if (gArgs.IsArgSet("-fallbackfee"))
-    {
-        CAmount nFeePerK = 0;
-        if (!ParseMoney(gArgs.GetArg("-fallbackfee", ""), nFeePerK))
-            return InitError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), gArgs.GetArg("-fallbackfee", "")));
-        if (nFeePerK > HIGH_TX_FEE_PER_KB)
-            InitWarning(AmountHighWarn("-fallbackfee") + " " +
-                        _("This is the transaction fee you may pay when fee estimates are not available."));
-        CWallet::fallbackFee = CFeeRate(nFeePerK);
-        g_wallet_allow_fallback_fee = nFeePerK != 0; //disable fallback fee in case value was set to 0, enable if non-null value
-    }
-    if (gArgs.IsArgSet("-discardfee"))
-    {
-        CAmount nFeePerK = 0;
-        if (!ParseMoney(gArgs.GetArg("-discardfee", ""), nFeePerK))
-            return InitError(strprintf(_("Invalid amount for -discardfee=<amount>: '%s'"), gArgs.GetArg("-discardfee", "")));
-        if (nFeePerK > HIGH_TX_FEE_PER_KB)
-            InitWarning(AmountHighWarn("-discardfee") + " " +
-                        _("This is the transaction fee you may discard if change is smaller than dust at this level"));
-        CWallet::m_discard_rate = CFeeRate(nFeePerK);
-    }
-    if (gArgs.IsArgSet("-paytxfee"))
-    {
-        CAmount nFeePerK = 0;
-        if (!ParseMoney(gArgs.GetArg("-paytxfee", ""), nFeePerK))
-            return InitError(AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", "")));
-        if (nFeePerK > HIGH_TX_FEE_PER_KB)
-            InitWarning(AmountHighWarn("-paytxfee") + " " +
-                        _("This is the transaction fee you will pay if you send a transaction."));
-
-        payTxFee = CFeeRate(nFeePerK, 1000);
-        if (payTxFee < ::minRelayTxFee)
-        {
-            return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
-                                       gArgs.GetArg("-paytxfee", ""), ::minRelayTxFee.ToString()));
-        }
-    }
     if (gArgs.IsArgSet("-maxtxfee"))
     {
         CAmount nMaxFee = 0;
@@ -212,9 +163,6 @@ bool WalletInit::ParameterInteraction() const
                                        gArgs.GetArg("-maxtxfee", ""), ::minRelayTxFee.ToString()));
         }
     }
-    nTxConfirmTarget = gArgs.GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
-    bSpendZeroConfChange = gArgs.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
-    fWalletRbf = gArgs.GetBoolArg("-walletrbf", DEFAULT_WALLET_RBF);
 
     return true;
 }
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 5bc8788c7c..c4c6701081 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -557,7 +557,7 @@ UniValue sendtoaddress(const JSONRPCRequest& request)
 
     CCoinControl coin_control;
     if (!request.params[5].isNull()) {
-        coin_control.signalRbf = request.params[5].get_bool();
+        coin_control.m_signal_bip125_rbf = request.params[5].get_bool();
     }
 
     if (!request.params[6].isNull()) {
@@ -1201,7 +1201,7 @@ UniValue sendmany(const JSONRPCRequest& request)
 
     CCoinControl coin_control;
     if (!request.params[5].isNull()) {
-        coin_control.signalRbf = request.params[5].get_bool();
+        coin_control.m_signal_bip125_rbf = request.params[5].get_bool();
     }
 
     if (!request.params[6].isNull()) {
@@ -2915,10 +2915,10 @@ UniValue settxfee(const JSONRPCRequest& request)
         return NullUniValue;
     }
 
-    if (request.fHelp || request.params.size() < 1 || request.params.size() > 1)
+    if (request.fHelp || request.params.size() < 1 || request.params.size() > 1) {
         throw std::runtime_error(
             "settxfee amount\n"
-            "\nSet the transaction fee per kB. Overwrites the paytxfee parameter.\n"
+            "\nSet the transaction fee per kB for this wallet. Overrides the global -paytxfee command line parameter.\n"
             "\nArguments:\n"
             "1. amount         (numeric or string, required) The transaction fee in " + CURRENCY_UNIT + "/kB\n"
             "\nResult\n"
@@ -2927,13 +2927,13 @@ UniValue settxfee(const JSONRPCRequest& request)
             + HelpExampleCli("settxfee", "0.00001")
             + HelpExampleRpc("settxfee", "0.00001")
         );
+    }
 
     LOCK2(cs_main, pwallet->cs_wallet);
 
-    // Amount
     CAmount nAmount = AmountFromValue(request.params[0]);
 
-    payTxFee = CFeeRate(nAmount, 1000);
+    pwallet->m_pay_tx_fee = CFeeRate(nAmount, 1000);
     return true;
 }
 
@@ -2994,9 +2994,9 @@ UniValue getwalletinfo(const JSONRPCRequest& request)
     if (pwallet->IsCrypted()) {
         obj.pushKV("unlocked_until", pwallet->nRelockTime);
     }
-    obj.pushKV("paytxfee",      ValueFromAmount(payTxFee.GetFeePerK()));
+    obj.pushKV("paytxfee", ValueFromAmount(pwallet->m_pay_tx_fee.GetFeePerK()));
     if (!masterKeyID.IsNull())
-         obj.pushKV("hdmasterkeyid", masterKeyID.GetHex());
+        obj.pushKV("hdmasterkeyid", masterKeyID.GetHex());
     return obj;
 }
 
@@ -3377,7 +3377,7 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
             subtractFeeFromOutputs = options["subtractFeeFromOutputs"].get_array();
 
         if (options.exists("replaceable")) {
-            coinControl.signalRbf = options["replaceable"].get_bool();
+            coinControl.m_signal_bip125_rbf = options["replaceable"].get_bool();
         }
         if (options.exists("conf_target")) {
             if (options.exists("feeRate")) {
@@ -3566,7 +3566,7 @@ UniValue bumpfee(const JSONRPCRequest& request)
     // optional parameters
     CAmount totalFee = 0;
     CCoinControl coin_control;
-    coin_control.signalRbf = true;
+    coin_control.m_signal_bip125_rbf = true;
     if (!request.params[1].isNull()) {
         UniValue options = request.params[1];
         RPCTypeCheckObj(options,
@@ -3590,7 +3590,7 @@ UniValue bumpfee(const JSONRPCRequest& request)
         }
 
         if (options.exists("replaceable")) {
-            coin_control.signalRbf = options["replaceable"].get_bool();
+            coin_control.m_signal_bip125_rbf = options["replaceable"].get_bool();
         }
         if (options.exists("estimate_mode")) {
             if (!FeeModeFromString(options["estimate_mode"].get_str(), coin_control.m_fee_mode)) {
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 8c392434fc..ad3dd4cd2c 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -72,29 +72,8 @@ CWallet* GetWallet(const std::string& name)
     return nullptr;
 }
 
-/** Transaction fee set by the user */
-CFeeRate payTxFee(DEFAULT_TRANSACTION_FEE);
-unsigned int nTxConfirmTarget = DEFAULT_TX_CONFIRM_TARGET;
-bool bSpendZeroConfChange = DEFAULT_SPEND_ZEROCONF_CHANGE;
-bool fWalletRbf = DEFAULT_WALLET_RBF;
-bool g_wallet_allow_fallback_fee = true; //<! will be defined via chainparams
-
 const uint32_t BIP32_HARDENED_KEY_LIMIT = 0x80000000;
 
-/**
- * Fees smaller than this (in satoshi) are considered zero fee (for transaction creation)
- * Override with -mintxfee
- */
-CFeeRate CWallet::minTxFee = CFeeRate(DEFAULT_TRANSACTION_MINFEE);
-/**
- * If fee estimation does not have enough data to provide estimates, use this fee instead.
- * Has no effect if not using fee estimation
- * Override with -fallbackfee
- */
-CFeeRate CWallet::fallbackFee = CFeeRate(DEFAULT_FALLBACK_FEE);
-
-CFeeRate CWallet::m_discard_rate = CFeeRate(DEFAULT_DISCARD_FEE);
-
 const uint256 CMerkleTx::ABANDON_HASH(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
 
 /** @defgroup mapWallet
@@ -2054,7 +2033,7 @@ bool CWalletTx::IsTrusted() const
         return true;
     if (nDepth < 0)
         return false;
-    if (!bSpendZeroConfChange || !IsFromMe(ISMINE_ALL)) // using wtx's cached debit
+    if (!pwallet->m_spend_zero_conf_change || !IsFromMe(ISMINE_ALL)) // using wtx's cached debit
         return false;
 
     // Don't trust unconfirmed transactions from us unless they are in the mempool.
@@ -2490,10 +2469,10 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, const CoinEligibil
         FeeCalculation feeCalc;
         CCoinControl temp;
         temp.m_confirm_target = 1008;
-        CFeeRate long_term_feerate = GetMinimumFeeRate(temp, ::mempool, ::feeEstimator, &feeCalc);
+        CFeeRate long_term_feerate = GetMinimumFeeRate(*this, temp, ::mempool, ::feeEstimator, &feeCalc);
 
         // Calculate cost of change
-        CAmount cost_of_change = GetDiscardRate(::feeEstimator).GetFee(coin_selection_params.change_spend_size) + coin_selection_params.effective_fee.GetFee(coin_selection_params.change_output_size);
+        CAmount cost_of_change = GetDiscardRate(*this, ::feeEstimator).GetFee(coin_selection_params.change_spend_size) + coin_selection_params.effective_fee.GetFee(coin_selection_params.change_output_size);
 
         // Filter by the min conf specs and add to utxo_pool and calculate effective value
         for (const COutput &output : vCoins)
@@ -2590,11 +2569,11 @@ bool CWallet::SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAm
     bool res = nTargetValue <= nValueFromPresetInputs ||
         SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(1, 6, 0), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used) ||
         SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(1, 1, 0), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used) ||
-        (bSpendZeroConfChange && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, 2), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) ||
-        (bSpendZeroConfChange && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, std::min((size_t)4, nMaxChainLength/3)), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) ||
-        (bSpendZeroConfChange && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, nMaxChainLength/2), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) ||
-        (bSpendZeroConfChange && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, nMaxChainLength), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) ||
-        (bSpendZeroConfChange && !fRejectLongChains && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, std::numeric_limits<uint64_t>::max()), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used));
+        (m_spend_zero_conf_change && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, 2), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) ||
+        (m_spend_zero_conf_change && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, std::min((size_t)4, nMaxChainLength/3)), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) ||
+        (m_spend_zero_conf_change && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, nMaxChainLength/2), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) ||
+        (m_spend_zero_conf_change && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, nMaxChainLength), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) ||
+        (m_spend_zero_conf_change && !fRejectLongChains && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, CoinEligibilityFilter(0, 1, std::numeric_limits<uint64_t>::max()), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used));
 
     // because SelectCoinsMinConf clears the setCoinsRet, we now add the possible inputs to the coinset
     setCoinsRet.insert(setPresetCoins.begin(), setPresetCoins.end());
@@ -2813,10 +2792,10 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CTransac
             CTxOut change_prototype_txout(0, scriptChange);
             coin_selection_params.change_output_size = GetSerializeSize(change_prototype_txout, SER_DISK, 0);
 
-            CFeeRate discard_rate = GetDiscardRate(::feeEstimator);
+            CFeeRate discard_rate = GetDiscardRate(*this, ::feeEstimator);
 
             // Get the fee rate to use effective values in coin selection
-            CFeeRate nFeeRateNeeded = GetMinimumFeeRate(coin_control, ::mempool, ::feeEstimator, &feeCalc);
+            CFeeRate nFeeRateNeeded = GetMinimumFeeRate(*this, coin_control, ::mempool, ::feeEstimator, &feeCalc);
 
             nFeeRet = 0;
             bool pick_new_inputs = true;
@@ -2940,8 +2919,8 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CTransac
                     return false;
                 }
 
-                nFeeNeeded = GetMinimumFee(nBytes, coin_control, ::mempool, ::feeEstimator, &feeCalc);
-                if (feeCalc.reason == FeeReason::FALLBACK && !g_wallet_allow_fallback_fee) {
+                nFeeNeeded = GetMinimumFee(*this, nBytes, coin_control, ::mempool, ::feeEstimator, &feeCalc);
+                if (feeCalc.reason == FeeReason::FALLBACK && !m_allow_fallback_fee) {
                     // eventually allow a fallback fee
                     strFailReason = _("Fee estimation failed. Fallbackfee is disabled. Wait a few blocks or enable -fallbackfee.");
                     return false;
@@ -2968,7 +2947,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CTransac
                     // change output. Only try this once.
                     if (nChangePosInOut == -1 && nSubtractFeeFromAmount == 0 && pick_new_inputs) {
                         unsigned int tx_size_with_change = nBytes + coin_selection_params.change_output_size + 2; // Add 2 as a buffer in case increasing # of outputs changes compact size
-                        CAmount fee_needed_with_change = GetMinimumFee(tx_size_with_change, coin_control, ::mempool, ::feeEstimator, nullptr);
+                        CAmount fee_needed_with_change = GetMinimumFee(*this, tx_size_with_change, coin_control, ::mempool, ::feeEstimator, nullptr);
                         CAmount minimum_value_for_change = GetDustThreshold(change_prototype_txout, discard_rate);
                         if (nFeeRet >= fee_needed_with_change + minimum_value_for_change) {
                             pick_new_inputs = false;
@@ -3035,7 +3014,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CTransac
         // to avoid conflicting with other possible uses of nSequence,
         // and in the spirit of "smallest possible change from prior
         // behavior."
-        const uint32_t nSequence = coin_control.signalRbf ? MAX_BIP125_RBF_SEQUENCE : (CTxIn::SEQUENCE_FINAL - 1);
+        const uint32_t nSequence = coin_control.m_signal_bip125_rbf.get_value_or(m_signal_rbf) ? MAX_BIP125_RBF_SEQUENCE : (CTxIn::SEQUENCE_FINAL - 1);
         for (const auto& coin : selected_coins) {
             txNew.vin.push_back(CTxIn(coin.outpoint, CScript(), nSequence));
         }
@@ -4080,6 +4059,66 @@ CWallet* CWallet::CreateWalletFromFile(const std::string& name, const fs::path&
         return nullptr;
     }
 
+    if (gArgs.IsArgSet("-mintxfee")) {
+        CAmount n = 0;
+        if (!ParseMoney(gArgs.GetArg("-mintxfee", ""), n) || 0 == n) {
+            InitError(AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", "")));
+            return nullptr;
+        }
+        if (n > HIGH_TX_FEE_PER_KB) {
+            InitWarning(AmountHighWarn("-mintxfee") + " " +
+                        _("This is the minimum transaction fee you pay on every transaction."));
+        }
+        walletInstance->m_min_fee = CFeeRate(n);
+    }
+
+    walletInstance->m_allow_fallback_fee = Params().IsFallbackFeeEnabled();
+    if (gArgs.IsArgSet("-fallbackfee")) {
+        CAmount nFeePerK = 0;
+        if (!ParseMoney(gArgs.GetArg("-fallbackfee", ""), nFeePerK)) {
+            InitError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), gArgs.GetArg("-fallbackfee", "")));
+            return nullptr;
+        }
+        if (nFeePerK > HIGH_TX_FEE_PER_KB) {
+            InitWarning(AmountHighWarn("-fallbackfee") + " " +
+                        _("This is the transaction fee you may pay when fee estimates are not available."));
+        }
+        walletInstance->m_fallback_fee = CFeeRate(nFeePerK);
+        walletInstance->m_allow_fallback_fee = nFeePerK != 0; //disable fallback fee in case value was set to 0, enable if non-null value
+    }
+    if (gArgs.IsArgSet("-discardfee")) {
+        CAmount nFeePerK = 0;
+        if (!ParseMoney(gArgs.GetArg("-discardfee", ""), nFeePerK)) {
+            InitError(strprintf(_("Invalid amount for -discardfee=<amount>: '%s'"), gArgs.GetArg("-discardfee", "")));
+            return nullptr;
+        }
+        if (nFeePerK > HIGH_TX_FEE_PER_KB) {
+            InitWarning(AmountHighWarn("-discardfee") + " " +
+                        _("This is the transaction fee you may discard if change is smaller than dust at this level"));
+        }
+        walletInstance->m_discard_rate = CFeeRate(nFeePerK);
+    }
+    if (gArgs.IsArgSet("-paytxfee")) {
+        CAmount nFeePerK = 0;
+        if (!ParseMoney(gArgs.GetArg("-paytxfee", ""), nFeePerK)) {
+            InitError(AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", "")));
+            return nullptr;
+        }
+        if (nFeePerK > HIGH_TX_FEE_PER_KB) {
+            InitWarning(AmountHighWarn("-paytxfee") + " " +
+                        _("This is the transaction fee you will pay if you send a transaction."));
+        }
+        walletInstance->m_pay_tx_fee = CFeeRate(nFeePerK, 1000);
+        if (walletInstance->m_pay_tx_fee < ::minRelayTxFee) {
+            InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
+                gArgs.GetArg("-paytxfee", ""), ::minRelayTxFee.ToString()));
+            return nullptr;
+        }
+    }
+    walletInstance->m_confirm_target = gArgs.GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
+    walletInstance->m_spend_zero_conf_change = gArgs.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
+    walletInstance->m_signal_rbf = gArgs.GetBoolArg("-walletrbf", DEFAULT_WALLET_RBF);
+
     LogPrintf(" wallet      %15dms\n", GetTimeMillis() - nStart);
 
     // Try to top up keypool. No-op if the wallet is locked.
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index dd165de825..780c82ac36 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -38,22 +38,13 @@ bool HasWallets();
 std::vector<CWallet*> GetWallets();
 CWallet* GetWallet(const std::string& name);
 
-/**
- * Settings
- */
-extern CFeeRate payTxFee;
-extern unsigned int nTxConfirmTarget;
-extern bool bSpendZeroConfChange;
-extern bool fWalletRbf;
-extern bool g_wallet_allow_fallback_fee;
-
 //! Default for -keypool
 static const unsigned int DEFAULT_KEYPOOL_SIZE = 1000;
 //! -paytxfee default
-static const CAmount DEFAULT_TRANSACTION_FEE = 0;
+constexpr CAmount DEFAULT_PAY_TX_FEE = 0;
 //! -fallbackfee default
 static const CAmount DEFAULT_FALLBACK_FEE = 20000;
-//! -m_discard_rate default
+//! -discardfee default
 static const CAmount DEFAULT_DISCARD_FEE = 10000;
 //! -mintxfee default
 static const CAmount DEFAULT_TRANSACTION_MINFEE = 1000;
@@ -968,9 +959,19 @@ public:
     bool DummySignTx(CMutableTransaction &txNew, const std::vector<CTxOut> &txouts) const;
     bool DummySignInput(CTxIn &tx_in, const CTxOut &txout) const;
 
-    static CFeeRate minTxFee;
-    static CFeeRate fallbackFee;
-    static CFeeRate m_discard_rate;
+    CFeeRate m_pay_tx_fee{DEFAULT_PAY_TX_FEE};
+    unsigned int m_confirm_target{DEFAULT_TX_CONFIRM_TARGET};
+    bool m_spend_zero_conf_change{DEFAULT_SPEND_ZEROCONF_CHANGE};
+    bool m_signal_rbf{DEFAULT_WALLET_RBF};
+    bool m_allow_fallback_fee{true}; //<! will be defined via chainparams
+    CFeeRate m_min_fee{DEFAULT_TRANSACTION_MINFEE}; //!< Override with -mintxfee
+    /**
+     * If fee estimation does not have enough data to provide estimates, use this fee instead.
+     * Has no effect if not using fee estimation
+     * Override with -fallbackfee
+     */
+    CFeeRate m_fallback_fee{DEFAULT_FALLBACK_FEE};
+    CFeeRate m_discard_rate{DEFAULT_DISCARD_FEE};
     OutputType m_default_address_type{DEFAULT_ADDRESS_TYPE};
     OutputType m_default_change_type{OutputType::NONE}; // Default to OutputType::NONE if not set by -changetype