diff --git a/src/init.cpp b/src/init.cpp
index 1e7e388a52..f06c9e1100 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -25,6 +25,7 @@
 #include "netbase.h"
 #include "net.h"
 #include "net_processing.h"
+#include "policy/fees.h"
 #include "policy/policy.h"
 #include "rpc/server.h"
 #include "rpc/register.h"
@@ -215,7 +216,7 @@ void Shutdown()
         fs::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
         CAutoFile est_fileout(fsbridge::fopen(est_path, "wb"), SER_DISK, CLIENT_VERSION);
         if (!est_fileout.IsNull())
-            mempool.WriteFeeEstimates(est_fileout);
+            ::feeEstimator.Write(est_fileout);
         else
             LogPrintf("%s: Failed to write fee estimates to %s\n", __func__, est_path.string());
         fFeeEstimatesInitialized = false;
@@ -1550,7 +1551,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     CAutoFile est_filein(fsbridge::fopen(est_path, "rb"), SER_DISK, CLIENT_VERSION);
     // Allowed to fail as this file IS missing on first startup.
     if (!est_filein.IsNull())
-        mempool.ReadFeeEstimates(est_filein);
+        ::feeEstimator.Read(est_filein);
     fFeeEstimatesInitialized = true;
 
     // ********************************************************* Step 8: load wallet
diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index 66da753a8b..eed71089e4 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -7,6 +7,7 @@
 #include "policy/policy.h"
 
 #include "amount.h"
+#include "clientversion.h"
 #include "primitives/transaction.h"
 #include "random.h"
 #include "streams.h"
@@ -173,7 +174,7 @@ double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
     return median;
 }
 
-void TxConfirmStats::Write(CAutoFile& fileout)
+void TxConfirmStats::Write(CAutoFile& fileout) const
 {
     fileout << decay;
     fileout << buckets;
@@ -464,21 +465,40 @@ CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, int *answerFoun
     return CFeeRate(median);
 }
 
-void CBlockPolicyEstimator::Write(CAutoFile& fileout)
+bool CBlockPolicyEstimator::Write(CAutoFile& fileout) const
 {
-    LOCK(cs_feeEstimator);
-    fileout << nBestSeenHeight;
-    feeStats.Write(fileout);
+    try {
+        LOCK(cs_feeEstimator);
+        fileout << 139900; // version required to read: 0.13.99 or later
+        fileout << CLIENT_VERSION; // version that wrote the file
+        fileout << nBestSeenHeight;
+        feeStats.Write(fileout);
+    }
+    catch (const std::exception&) {
+        LogPrintf("CBlockPolicyEstimator::Write(): unable to read policy estimator data (non-fatal)\n");
+        return false;
+    }
+    return true;
 }
 
-void CBlockPolicyEstimator::Read(CAutoFile& filein, int nFileVersion)
+bool CBlockPolicyEstimator::Read(CAutoFile& filein)
 {
-    LOCK(cs_feeEstimator);
-    int nFileBestSeenHeight;
-    filein >> nFileBestSeenHeight;
-    feeStats.Read(filein);
-    nBestSeenHeight = nFileBestSeenHeight;
-    // if nVersionThatWrote < 139900 then another TxConfirmStats (for priority) follows but can be ignored.
+    try {
+        LOCK(cs_feeEstimator);
+        int nVersionRequired, nVersionThatWrote, nFileBestSeenHeight;
+        filein >> nVersionRequired >> nVersionThatWrote;
+        if (nVersionRequired > CLIENT_VERSION)
+            return error("CBlockPolicyEstimator::Read(): up-version (%d) fee estimate file", nVersionRequired);
+        filein >> nFileBestSeenHeight;
+        feeStats.Read(filein);
+        nBestSeenHeight = nFileBestSeenHeight;
+        // if nVersionThatWrote < 139900 then another TxConfirmStats (for priority) follows but can be ignored.
+    }
+    catch (const std::exception&) {
+        LogPrintf("CBlockPolicyEstimator::Read(): unable to read policy estimator data (non-fatal)\n");
+        return false;
+    }
+    return true;
 }
 
 FeeFilterRounder::FeeFilterRounder(const CFeeRate& minIncrementalFee)
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 2299144b94..d11de81ee3 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -156,7 +156,7 @@ public:
     unsigned int GetMaxConfirms() const { return confAvg.size(); }
 
     /** Write state of estimation data to a file*/
-    void Write(CAutoFile& fileout);
+    void Write(CAutoFile& fileout) const;
 
     /**
      * Read saved state of estimation data from a file and replace all internal data structures and
@@ -226,10 +226,10 @@ public:
     CFeeRate estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool) const;
 
     /** Write estimation data to a file */
-    void Write(CAutoFile& fileout);
+    bool Write(CAutoFile& fileout) const;
 
     /** Read estimation data from a file */
-    void Read(CAutoFile& filein, int nFileVersion);
+    bool Read(CAutoFile& filein);
 
 private:
     CFeeRate minTrackedFee;    //!< Passed to constructor to avoid dependency on main
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index fa05841491..ac842da6bf 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -5,7 +5,6 @@
 
 #include "txmempool.h"
 
-#include "clientversion.h"
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
 #include "validation.h"
@@ -16,7 +15,6 @@
 #include "util.h"
 #include "utilmoneystr.h"
 #include "utiltime.h"
-#include "version.h"
 
 CTxMemPoolEntry::CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFee,
                                  int64_t _nTime, unsigned int _entryHeight,
@@ -843,38 +841,6 @@ TxMempoolInfo CTxMemPool::info(const uint256& hash) const
     return GetInfo(i);
 }
 
-bool
-CTxMemPool::WriteFeeEstimates(CAutoFile& fileout) const
-{
-    try {
-        fileout << 139900; // version required to read: 0.13.99 or later
-        fileout << CLIENT_VERSION; // version that wrote the file
-        minerPolicyEstimator->Write(fileout);
-    }
-    catch (const std::exception&) {
-        LogPrintf("CTxMemPool::WriteFeeEstimates(): unable to write policy estimator data (non-fatal)\n");
-        return false;
-    }
-    return true;
-}
-
-bool
-CTxMemPool::ReadFeeEstimates(CAutoFile& filein)
-{
-    try {
-        int nVersionRequired, nVersionThatWrote;
-        filein >> nVersionRequired >> nVersionThatWrote;
-        if (nVersionRequired > CLIENT_VERSION)
-            return error("CTxMemPool::ReadFeeEstimates(): up-version (%d) fee estimate file", nVersionRequired);
-        minerPolicyEstimator->Read(filein, nVersionThatWrote);
-    }
-    catch (const std::exception&) {
-        LogPrintf("CTxMemPool::ReadFeeEstimates(): unable to read policy estimator data (non-fatal)\n");
-        return false;
-    }
-    return true;
-}
-
 void CTxMemPool::PrioritiseTransaction(const uint256& hash, const CAmount& nFeeDelta)
 {
     {
diff --git a/src/txmempool.h b/src/txmempool.h
index 3aa5b46c46..92c4d9f9d4 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -617,10 +617,6 @@ public:
     TxMempoolInfo info(const uint256& hash) const;
     std::vector<TxMempoolInfo> infoAll() const;
 
-    /** Write/Read estimates to disk */
-    bool WriteFeeEstimates(CAutoFile& fileout) const;
-    bool ReadFeeEstimates(CAutoFile& filein);
-
     size_t DynamicMemoryUsage() const;
 
     boost::signals2::signal<void (CTransactionRef)> NotifyEntryAdded;