diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index 05f2a20e9a..66da753a8b 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -77,7 +77,7 @@ void TxConfirmStats::UpdateMovingAverages()
 // returns -1 on error conditions
 double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
                                          double successBreakPoint, bool requireGreater,
-                                         unsigned int nBlockHeight)
+                                         unsigned int nBlockHeight) const
 {
     // Counters for a bucket (or range of buckets)
     double nConf = 0; // Number of tx's confirmed within the confTarget
@@ -411,7 +411,7 @@ void CBlockPolicyEstimator::processBlock(unsigned int nBlockHeight,
     untrackedTxs = 0;
 }
 
-CFeeRate CBlockPolicyEstimator::estimateFee(int confTarget)
+CFeeRate CBlockPolicyEstimator::estimateFee(int confTarget) const
 {
     LOCK(cs_feeEstimator);
     // Return failure if trying to analyze a target we're not tracking
@@ -427,7 +427,7 @@ CFeeRate CBlockPolicyEstimator::estimateFee(int confTarget)
     return CFeeRate(median);
 }
 
-CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool)
+CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool) const
 {
     if (answerFoundAtTarget)
         *answerFoundAtTarget = confTarget;
diff --git a/src/policy/fees.h b/src/policy/fees.h
index e11a6582a4..2299144b94 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -150,10 +150,10 @@ public:
      * @param nBlockHeight the current block height
      */
     double EstimateMedianVal(int confTarget, double sufficientTxVal,
-                             double minSuccess, bool requireGreater, unsigned int nBlockHeight);
+                             double minSuccess, bool requireGreater, unsigned int nBlockHeight) const;
 
     /** Return the max number of confirms we're tracking */
-    unsigned int GetMaxConfirms() { return confAvg.size(); }
+    unsigned int GetMaxConfirms() const { return confAvg.size(); }
 
     /** Write state of estimation data to a file*/
     void Write(CAutoFile& fileout);
@@ -217,13 +217,13 @@ public:
     bool removeTx(uint256 hash);
 
     /** Return a feerate estimate */
-    CFeeRate estimateFee(int confTarget);
+    CFeeRate estimateFee(int confTarget) const;
 
     /** Estimate feerate needed to get be included in a block within
      *  confTarget blocks. If no answer can be given at confTarget, return an
      *  estimate at the lowest target where one can be given.
      */
-    CFeeRate estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool);
+    CFeeRate estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool) const;
 
     /** Write estimation data to a file */
     void Write(CAutoFile& fileout);
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index 1d19c65753..38ad6e9aab 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -15,6 +15,7 @@
 
 #include "wallet/coincontrol.h"
 #include "init.h"
+#include "policy/fees.h"
 #include "policy/policy.h"
 #include "validation.h" // For mempool
 #include "wallet/wallet.h"
@@ -512,7 +513,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
                 nBytes -= 34;
 
         // Fee
-        nPayFee = CWallet::GetMinimumFee(nBytes, nTxConfirmTarget, mempool);
+        nPayFee = CWallet::GetMinimumFee(nBytes, nTxConfirmTarget, ::mempool, ::feeEstimator);
         if (nPayFee > 0 && coinControl->nMinimumTotalFee > nPayFee)
             nPayFee = coinControl->nMinimumTotalFee;
 
@@ -592,7 +593,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
     if (payTxFee.GetFeePerK() > 0)
         dFeeVary = (double)std::max(CWallet::GetRequiredFee(1000), payTxFee.GetFeePerK()) / 1000;
     else {
-        dFeeVary = (double)std::max(CWallet::GetRequiredFee(1000), mempool.estimateSmartFee(nTxConfirmTarget).GetFeePerK()) / 1000;
+        dFeeVary = (double)std::max(CWallet::GetRequiredFee(1000), ::feeEstimator.estimateSmartFee(nTxConfirmTarget, NULL, ::mempool).GetFeePerK()) / 1000;
     }
     QString toolTip4 = tr("Can vary +/- %1 satoshi(s) per input.").arg(dFeeVary);
 
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index ed7eab03f3..5d58a6a11f 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -21,6 +21,7 @@
 #include "validation.h" // mempool and minRelayTxFee
 #include "ui_interface.h"
 #include "txmempool.h"
+#include "policy/fees.h"
 #include "wallet/wallet.h"
 
 #include <QFontMetrics>
@@ -660,7 +661,7 @@ void SendCoinsDialog::updateSmartFeeLabel()
 
     int nBlocksToConfirm = ui->sliderSmartFee->maximum() - ui->sliderSmartFee->value() + 2;
     int estimateFoundAtBlocks = nBlocksToConfirm;
-    CFeeRate feeRate = mempool.estimateSmartFee(nBlocksToConfirm, &estimateFoundAtBlocks);
+    CFeeRate feeRate = ::feeEstimator.estimateSmartFee(nBlocksToConfirm, &estimateFoundAtBlocks, ::mempool);
     if (feeRate <= CFeeRate(0)) // not enough data => minfee
     {
         ui->labelSmartFee->setText(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(),
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 7e5f0d608e..4aad267b8a 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -15,6 +15,7 @@
 #include "validation.h"
 #include "miner.h"
 #include "net.h"
+#include "policy/fees.h"
 #include "pow.h"
 #include "rpc/blockchain.h"
 #include "rpc/server.h"
@@ -819,7 +820,7 @@ UniValue estimatefee(const JSONRPCRequest& request)
     if (nBlocks < 1)
         nBlocks = 1;
 
-    CFeeRate feeRate = mempool.estimateFee(nBlocks);
+    CFeeRate feeRate = ::feeEstimator.estimateFee(nBlocks);
     if (feeRate == CFeeRate(0))
         return -1.0;
 
@@ -857,7 +858,7 @@ UniValue estimatesmartfee(const JSONRPCRequest& request)
 
     UniValue result(UniValue::VOBJ);
     int answerFound;
-    CFeeRate feeRate = mempool.estimateSmartFee(nBlocks, &answerFound);
+    CFeeRate feeRate = ::feeEstimator.estimateSmartFee(nBlocks, &answerFound, ::mempool);
     result.push_back(Pair("feerate", feeRate == CFeeRate(0) ? -1.0 : ValueFromAmount(feeRate.GetFeePerK())));
     result.push_back(Pair("blocks", answerFound));
     return result;
diff --git a/src/test/policyestimator_tests.cpp b/src/test/policyestimator_tests.cpp
index 93abd18306..ed6782ea34 100644
--- a/src/test/policyestimator_tests.cpp
+++ b/src/test/policyestimator_tests.cpp
@@ -79,16 +79,16 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
             // At this point we should need to combine 5 buckets to get enough data points
             // So estimateFee(1,2,3) should fail and estimateFee(4) should return somewhere around
             // 8*baserate.  estimateFee(4) %'s are 100,100,100,100,90 = average 98%
-            BOOST_CHECK(mpool.estimateFee(1) == CFeeRate(0));
-            BOOST_CHECK(mpool.estimateFee(2) == CFeeRate(0));
-            BOOST_CHECK(mpool.estimateFee(3) == CFeeRate(0));
-            BOOST_CHECK(mpool.estimateFee(4).GetFeePerK() < 8*baseRate.GetFeePerK() + deltaFee);
-            BOOST_CHECK(mpool.estimateFee(4).GetFeePerK() > 8*baseRate.GetFeePerK() - deltaFee);
+            BOOST_CHECK(feeEst.estimateFee(1) == CFeeRate(0));
+            BOOST_CHECK(feeEst.estimateFee(2) == CFeeRate(0));
+            BOOST_CHECK(feeEst.estimateFee(3) == CFeeRate(0));
+            BOOST_CHECK(feeEst.estimateFee(4).GetFeePerK() < 8*baseRate.GetFeePerK() + deltaFee);
+            BOOST_CHECK(feeEst.estimateFee(4).GetFeePerK() > 8*baseRate.GetFeePerK() - deltaFee);
             int answerFound;
-            BOOST_CHECK(mpool.estimateSmartFee(1, &answerFound) == mpool.estimateFee(4) && answerFound == 4);
-            BOOST_CHECK(mpool.estimateSmartFee(3, &answerFound) == mpool.estimateFee(4) && answerFound == 4);
-            BOOST_CHECK(mpool.estimateSmartFee(4, &answerFound) == mpool.estimateFee(4) && answerFound == 4);
-            BOOST_CHECK(mpool.estimateSmartFee(8, &answerFound) == mpool.estimateFee(8) && answerFound == 8);
+            BOOST_CHECK(feeEst.estimateSmartFee(1, &answerFound, mpool) == feeEst.estimateFee(4) && answerFound == 4);
+            BOOST_CHECK(feeEst.estimateSmartFee(3, &answerFound, mpool) == feeEst.estimateFee(4) && answerFound == 4);
+            BOOST_CHECK(feeEst.estimateSmartFee(4, &answerFound, mpool) == feeEst.estimateFee(4) && answerFound == 4);
+            BOOST_CHECK(feeEst.estimateSmartFee(8, &answerFound, mpool) == feeEst.estimateFee(8) && answerFound == 8);
         }
     }
 
@@ -100,7 +100,7 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     // Second highest feerate has 100% chance of being included by 2 blocks,
     // so estimateFee(2) should return 9*baseRate etc...
     for (int i = 1; i < 10;i++) {
-        origFeeEst.push_back(mpool.estimateFee(i).GetFeePerK());
+        origFeeEst.push_back(feeEst.estimateFee(i).GetFeePerK());
         if (i > 2) { // Fee estimates should be monotonically decreasing
             BOOST_CHECK(origFeeEst[i-1] <= origFeeEst[i-2]);
         }
@@ -119,10 +119,10 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     while (blocknum < 250)
         mpool.removeForBlock(block, ++blocknum);
 
-    BOOST_CHECK(mpool.estimateFee(1) == CFeeRate(0));
+    BOOST_CHECK(feeEst.estimateFee(1) == CFeeRate(0));
     for (int i = 2; i < 10;i++) {
-        BOOST_CHECK(mpool.estimateFee(i).GetFeePerK() < origFeeEst[i-1] + deltaFee);
-        BOOST_CHECK(mpool.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
+        BOOST_CHECK(feeEst.estimateFee(i).GetFeePerK() < origFeeEst[i-1] + deltaFee);
+        BOOST_CHECK(feeEst.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
     }
 
 
@@ -142,8 +142,8 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
 
     int answerFound;
     for (int i = 1; i < 10;i++) {
-        BOOST_CHECK(mpool.estimateFee(i) == CFeeRate(0) || mpool.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
-        BOOST_CHECK(mpool.estimateSmartFee(i, &answerFound).GetFeePerK() > origFeeEst[answerFound-1] - deltaFee);
+        BOOST_CHECK(feeEst.estimateFee(i) == CFeeRate(0) || feeEst.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
+        BOOST_CHECK(feeEst.estimateSmartFee(i, &answerFound, mpool).GetFeePerK() > origFeeEst[answerFound-1] - deltaFee);
     }
 
     // Mine all those transactions
@@ -158,9 +158,9 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     }
     mpool.removeForBlock(block, 265);
     block.clear();
-    BOOST_CHECK(mpool.estimateFee(1) == CFeeRate(0));
+    BOOST_CHECK(feeEst.estimateFee(1) == CFeeRate(0));
     for (int i = 2; i < 10;i++) {
-        BOOST_CHECK(mpool.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
+        BOOST_CHECK(feeEst.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
     }
 
     // Mine 200 more blocks where everything is mined every block
@@ -180,9 +180,9 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
         mpool.removeForBlock(block, ++blocknum);
         block.clear();
     }
-    BOOST_CHECK(mpool.estimateFee(1) == CFeeRate(0));
+    BOOST_CHECK(feeEst.estimateFee(1) == CFeeRate(0));
     for (int i = 2; i < 10; i++) {
-        BOOST_CHECK(mpool.estimateFee(i).GetFeePerK() < origFeeEst[i-1] - deltaFee);
+        BOOST_CHECK(feeEst.estimateFee(i).GetFeePerK() < origFeeEst[i-1] - deltaFee);
     }
 
     // Test that if the mempool is limited, estimateSmartFee won't return a value below the mempool min fee
@@ -191,8 +191,8 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     mpool.TrimToSize(1);
     BOOST_CHECK(mpool.GetMinFee(1).GetFeePerK() > feeV[5]);
     for (int i = 1; i < 10; i++) {
-        BOOST_CHECK(mpool.estimateSmartFee(i).GetFeePerK() >= mpool.estimateFee(i).GetFeePerK());
-        BOOST_CHECK(mpool.estimateSmartFee(i).GetFeePerK() >= mpool.GetMinFee(1).GetFeePerK());
+        BOOST_CHECK(feeEst.estimateSmartFee(i, NULL, mpool).GetFeePerK() >= feeEst.estimateFee(i).GetFeePerK());
+        BOOST_CHECK(feeEst.estimateSmartFee(i, NULL, mpool).GetFeePerK() >= mpool.GetMinFee(1).GetFeePerK());
     }
 }
 
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 7fac48d3c5..fa05841491 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -843,15 +843,6 @@ TxMempoolInfo CTxMemPool::info(const uint256& hash) const
     return GetInfo(i);
 }
 
-CFeeRate CTxMemPool::estimateFee(int nBlocks) const
-{
-    return minerPolicyEstimator->estimateFee(nBlocks);
-}
-CFeeRate CTxMemPool::estimateSmartFee(int nBlocks, int *answerFoundAtBlocks) const
-{
-    return minerPolicyEstimator->estimateSmartFee(nBlocks, answerFoundAtBlocks, *this);
-}
-
 bool
 CTxMemPool::WriteFeeEstimates(CAutoFile& fileout) const
 {
diff --git a/src/txmempool.h b/src/txmempool.h
index 8ec2b0090d..3aa5b46c46 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -617,15 +617,6 @@ public:
     TxMempoolInfo info(const uint256& hash) const;
     std::vector<TxMempoolInfo> infoAll() const;
 
-    /** Estimate fee rate needed to get into the next nBlocks
-     *  If no answer can be given at nBlocks, return an estimate
-     *  at the lowest number of blocks where one can be given
-     */
-    CFeeRate estimateSmartFee(int nBlocks, int *answerFoundAtBlocks = NULL) const;
-
-    /** Estimate fee rate needed to get into the next nBlocks */
-    CFeeRate estimateFee(int nBlocks) const;
-
     /** Write/Read estimates to disk */
     bool WriteFeeEstimates(CAutoFile& fileout) const;
     bool ReadFeeEstimates(CAutoFile& filein);
diff --git a/src/wallet/feebumper.cpp b/src/wallet/feebumper.cpp
index fe3871a91d..67792dad79 100644
--- a/src/wallet/feebumper.cpp
+++ b/src/wallet/feebumper.cpp
@@ -5,6 +5,7 @@
 #include "consensus/validation.h"
 #include "wallet/feebumper.h"
 #include "wallet/wallet.h"
+#include "policy/fees.h"
 #include "policy/policy.h"
 #include "policy/rbf.h"
 #include "validation.h" //for mempool access
@@ -159,11 +160,11 @@ CFeeBumper::CFeeBumper(const CWallet *pWallet, const uint256 txidIn, int newConf
     } else {
         // if user specified a confirm target then don't consider any global payTxFee
         if (specifiedConfirmTarget) {
-            nNewFee = CWallet::GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool, CAmount(0));
+            nNewFee = CWallet::GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool, ::feeEstimator, CAmount(0));
         }
         // otherwise use the regular wallet logic to select payTxFee or default confirm target
         else {
-            nNewFee = CWallet::GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool);
+            nNewFee = CWallet::GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool, ::feeEstimator);
         }
 
         nNewFeeRate = CFeeRate(nNewFee, maxNewTxSize);
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 2cc3072c16..43b71712c0 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -11,6 +11,7 @@
 #include "init.h"
 #include "validation.h"
 #include "net.h"
+#include "policy/fees.h"
 #include "policy/policy.h"
 #include "policy/rbf.h"
 #include "rpc/server.h"
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 99fcb21f68..9defcb54c8 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -16,6 +16,7 @@
 #include "keystore.h"
 #include "validation.h"
 #include "net.h"
+#include "policy/fees.h"
 #include "policy/policy.h"
 #include "policy/rbf.h"
 #include "primitives/block.h"
@@ -2575,7 +2576,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
                 if (coinControl && coinControl->nConfirmTarget > 0)
                     currentConfirmationTarget = coinControl->nConfirmTarget;
 
-                CAmount nFeeNeeded = GetMinimumFee(nBytes, currentConfirmationTarget, mempool);
+                CAmount nFeeNeeded = GetMinimumFee(nBytes, currentConfirmationTarget, ::mempool, ::feeEstimator);
                 if (coinControl && nFeeNeeded > 0 && coinControl->nMinimumTotalFee > nFeeNeeded) {
                     nFeeNeeded = coinControl->nMinimumTotalFee;
                 }
@@ -2749,19 +2750,19 @@ CAmount CWallet::GetRequiredFee(unsigned int nTxBytes)
     return std::max(minTxFee.GetFee(nTxBytes), ::minRelayTxFee.GetFee(nTxBytes));
 }
 
-CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool)
+CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator)
 {
     // payTxFee is the user-set global for desired feerate
-    return GetMinimumFee(nTxBytes, nConfirmTarget, pool, payTxFee.GetFee(nTxBytes));
+    return GetMinimumFee(nTxBytes, nConfirmTarget, pool, estimator, payTxFee.GetFee(nTxBytes));
 }
 
-CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool, CAmount targetFee)
+CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, CAmount targetFee)
 {
     CAmount nFeeNeeded = targetFee;
     // User didn't set: use -txconfirmtarget to estimate...
     if (nFeeNeeded == 0) {
         int estimateFoundTarget = nConfirmTarget;
-        nFeeNeeded = pool.estimateSmartFee(nConfirmTarget, &estimateFoundTarget).GetFee(nTxBytes);
+        nFeeNeeded = estimator.estimateSmartFee(nConfirmTarget, &estimateFoundTarget, pool).GetFee(nTxBytes);
         // ... unless we don't have enough mempool data for estimatefee, then use fallbackFee
         if (nFeeNeeded == 0)
             nFeeNeeded = fallbackFee.GetFee(nTxBytes);
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index c714ddd090..c8869a4c0f 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -75,6 +75,7 @@ class CReserveKey;
 class CScript;
 class CScheduler;
 class CTxMemPool;
+class CBlockPolicyEstimator;
 class CWalletTx;
 
 /** (client) version numbers for particular wallet features */
@@ -890,12 +891,12 @@ public:
      * Estimate the minimum fee considering user set parameters
      * and the required fee
      */
-    static CAmount GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool);
+    static CAmount GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator);
     /**
      * Estimate the minimum fee considering required fee and targetFee or if 0
      * then fee estimation for nConfirmTarget
      */
-    static CAmount GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool, CAmount targetFee);
+    static CAmount GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, CAmount targetFee);
     /**
      * Return the minimum required fee taking into account the
      * floating relay fee and user set minimum transaction fee