From b2e3729c39be6dcd6f391d203ef5854e7409b790 Mon Sep 17 00:00:00 2001
From: Mononaut <github@monospace.live>
Date: Wed, 29 Oct 2025 08:50:51 +0000
Subject: [PATCH 1/7] Add support for subsat & fractional fee recommendations

---
 backend/src/api/bitcoin/bitcoin.routes.ts | 11 +++++
 backend/src/api/fee-api.ts                | 56 +++++++++++++++--------
 backend/src/config.ts                     |  2 +
 3 files changed, 50 insertions(+), 19 deletions(-)

diff --git a/backend/src/api/bitcoin/bitcoin.routes.ts b/backend/src/api/bitcoin/bitcoin.routes.ts
index bdc4445f9..e6075ffa2 100644
--- a/backend/src/api/bitcoin/bitcoin.routes.ts
+++ b/backend/src/api/bitcoin/bitcoin.routes.ts
@@ -36,6 +36,7 @@ class BitcoinRoutes {
       .get(config.MEMPOOL.API_URL_PREFIX + 'cpfp/:txId', this.$getCpfpInfo)
       .get(config.MEMPOOL.API_URL_PREFIX + 'difficulty-adjustment', this.getDifficultyChange)
       .get(config.MEMPOOL.API_URL_PREFIX + 'fees/recommended', this.getRecommendedFees)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'fees/precise', this.getPreciseRecommendedFees)
       .get(config.MEMPOOL.API_URL_PREFIX + 'fees/mempool-blocks', this.getMempoolBlocks)
       .get(config.MEMPOOL.API_URL_PREFIX + 'backend-info', this.getBackendInfo)
       .get(config.MEMPOOL.API_URL_PREFIX + 'init-data', this.getInitData)
@@ -122,6 +123,16 @@ class BitcoinRoutes {
     res.json(result);
   }
 
+  private getPreciseRecommendedFees(req: Request, res: Response) {
+    if (!mempool.isInSync()) {
+      res.statusCode = 503;
+      res.send('Service Unavailable');
+      return;
+    }
+    const result = feeApi.getPreciseRecommendedFee();
+    res.json(result);
+  }
+
   private getMempoolBlocks(req: Request, res: Response) {
     try {
       const result = mempoolBlocks.getMempoolBlocks();
diff --git a/backend/src/api/fee-api.ts b/backend/src/api/fee-api.ts
index 8efb8f605..12b56595e 100644
--- a/backend/src/api/fee-api.ts
+++ b/backend/src/api/fee-api.ts
@@ -17,7 +17,7 @@ interface RecommendedFees {
 class FeeApi {
   constructor() { }
 
-  defaultFee = isLiquid ? 0.1 : 1;
+  defaultFee = isLiquid ? 0.1 : config.MEMPOOL.MIN_RECOMMENDED_FEE;
   minimumIncrement = isLiquid ? 0.1 : 1;
 
   public getRecommendedFee(): RecommendedFees {
@@ -27,24 +27,36 @@ class FeeApi {
     return this.calculateRecommendedFee(pBlocks, mPool);
   }
 
-  public calculateRecommendedFee(pBlocks: MempoolBlock[], mPool: IBitcoinApi.MempoolInfo): RecommendedFees {
-    const minimumFee = this.roundUpToNearest(mPool.mempoolminfee * 100000, this.minimumIncrement);
-    const defaultMinFee = Math.max(minimumFee, this.defaultFee);
+  public getPreciseRecommendedFee(): RecommendedFees {
+    const pBlocks = projectedBlocks.getMempoolBlocks();
+    const mPool = mempool.getMempoolInfo();
+
+    // minimum non-zero minrelaytxfee / incrementalrelayfee is 1 sat/kvB = 0.001 sat/vB
+    return this.calculateRecommendedFee(pBlocks, mPool, 0.001);
+  }
+
+  public calculateRecommendedFee(pBlocks: MempoolBlock[], mPool: IBitcoinApi.MempoolInfo, minIncrement: number = this.minimumIncrement): RecommendedFees {
+    const purgeRate = this.roundUpToNearest(mPool.mempoolminfee * 100000, minIncrement);
+    const minimumFee = Math.max(purgeRate, config.MEMPOOL.MIN_RECOMMENDED_FEE, minIncrement);
 
     if (!pBlocks.length) {
       return {
-        'fastestFee': defaultMinFee,
-        'halfHourFee': defaultMinFee,
-        'hourFee': defaultMinFee,
+        'fastestFee': minimumFee,
+        'halfHourFee': minimumFee,
+        'hourFee': minimumFee,
         'economyFee': minimumFee,
         'minimumFee': minimumFee,
       };
     }
 
-    const firstMedianFee = this.optimizeMedianFee(pBlocks[0], pBlocks[1]);
-    const secondMedianFee = pBlocks[1] ? this.optimizeMedianFee(pBlocks[1], pBlocks[2], firstMedianFee) : this.defaultFee;
-    const thirdMedianFee = pBlocks[2] ? this.optimizeMedianFee(pBlocks[2], pBlocks[3], secondMedianFee) : this.defaultFee;
+    const firstMedianFee = this.optimizeMedianFee(pBlocks[0], pBlocks[1], undefined, minimumFee, minIncrement);
+    const secondMedianFee = pBlocks[1] ? this.optimizeMedianFee(pBlocks[1], pBlocks[2], firstMedianFee, minimumFee, minIncrement) : minimumFee;
+    const thirdMedianFee = pBlocks[2] ? this.optimizeMedianFee(pBlocks[2], pBlocks[3], secondMedianFee, minimumFee, minIncrement) : minimumFee;
 
+    // explicitly enforce a minimum of ceil(mempoolminfee) on all recommendations.
+    // simply rounding up recommended rates is insufficient, as the purging rate
+    // can exceed the median rate of projected blocks in some extreme scenarios
+    // (see https://bitcoin.stackexchange.com/a/120024)
     let fastestFee = Math.max(minimumFee, firstMedianFee);
     let halfHourFee = Math.max(minimumFee, secondMedianFee);
     let hourFee = Math.max(minimumFee, thirdMedianFee);
@@ -55,10 +67,6 @@ class FeeApi {
     halfHourFee = Math.max(halfHourFee, hourFee, economyFee);
     hourFee = Math.max(hourFee, economyFee);
 
-    // explicitly enforce a minimum of ceil(mempoolminfee) on all recommendations.
-    // simply rounding up recommended rates is insufficient, as the purging rate
-    // can exceed the median rate of projected blocks in some extreme scenarios
-    // (see https://bitcoin.stackexchange.com/a/120024)
     return {
       'fastestFee': fastestFee,
       'halfHourFee': halfHourFee,
@@ -68,20 +76,30 @@ class FeeApi {
     };
   }
 
-  private optimizeMedianFee(pBlock: MempoolBlock, nextBlock: MempoolBlock | undefined, previousFee?: number): number {
+  private optimizeMedianFee(pBlock: MempoolBlock, nextBlock: MempoolBlock | undefined, previousFee?: number, minFee: number = this.defaultFee, minIncrement: number = this.minimumIncrement): number {
     const useFee = previousFee ? (pBlock.medianFee + previousFee) / 2 : pBlock.medianFee;
     if (pBlock.blockVSize <= 500000 || pBlock.medianFee < 1) {
-      return this.defaultFee;
+      return minFee;
     }
     if (pBlock.blockVSize <= 950000 && !nextBlock) {
       const multiplier = (pBlock.blockVSize - 500000) / 500000;
-      return Math.max(Math.round(useFee * multiplier), this.defaultFee);
+      return Math.max(this.roundToNearest(useFee * multiplier, minIncrement), minFee);
     }
-    return this.roundUpToNearest(useFee, this.minimumIncrement);
+    return Math.max(this.roundUpToNearest(useFee, minIncrement), minFee);
   }
 
   private roundUpToNearest(value: number, nearest: number): number {
-    return Math.ceil(value / nearest) * nearest;
+    if (nearest !== 0) {
+      return Math.ceil(value / nearest) * nearest;
+    }
+    return value;
+  }
+
+  private roundToNearest(value: number, nearest: number): number {
+    if (nearest !== 0) {
+      return Math.round(value / nearest) * nearest;
+    }
+    return value;
   }
 }
 
diff --git a/backend/src/config.ts b/backend/src/config.ts
index 3fe3db2ee..f3260e788 100644
--- a/backend/src/config.ts
+++ b/backend/src/config.ts
@@ -43,6 +43,7 @@ interface IConfig {
     ALLOW_UNREACHABLE: boolean;
     PRICE_UPDATES_PER_HOUR: number;
     MAX_TRACKED_ADDRESSES: number;
+    MIN_RECOMMENDED_FEE: number;
   };
   ESPLORA: {
     REST_API_URL: string;
@@ -214,6 +215,7 @@ const defaults: IConfig = {
     'ALLOW_UNREACHABLE': true,
     'PRICE_UPDATES_PER_HOUR': 1,
     'MAX_TRACKED_ADDRESSES': 1,
+    'MIN_RECOMMENDED_FEE': 1,
   },
   'ESPLORA': {
     'REST_API_URL': 'http://127.0.0.1:3000',

From 5f051c7d0da61586b575d615024b3e947fdac69a Mon Sep 17 00:00:00 2001
From: Mononaut <github@monospace.live>
Date: Wed, 29 Oct 2025 08:52:01 +0000
Subject: [PATCH 2/7] Enable subsat fee recommendations in prod

---
 production/mempool-config.mainnet.json  | 3 ++-
 production/mempool-config.signet.json   | 3 ++-
 production/mempool-config.testnet.json  | 3 ++-
 production/mempool-config.testnet4.json | 3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/production/mempool-config.mainnet.json b/production/mempool-config.mainnet.json
index 87f58f916..301bd0f3f 100644
--- a/production/mempool-config.mainnet.json
+++ b/production/mempool-config.mainnet.json
@@ -23,7 +23,8 @@
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
     "PRICE_UPDATES_PER_HOUR": 12,
-    "MAX_TRACKED_ADDRESSES": 10
+    "MAX_TRACKED_ADDRESSES": 10,
+    "MIN_RECOMMENDED_TX_FEE": 0.1
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"
diff --git a/production/mempool-config.signet.json b/production/mempool-config.signet.json
index 952845ae9..d4c45d133 100644
--- a/production/mempool-config.signet.json
+++ b/production/mempool-config.signet.json
@@ -16,7 +16,8 @@
     "DISK_CACHE_BLOCK_INTERVAL": 1,
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
-    "MAX_TRACKED_ADDRESSES": 10
+    "MAX_TRACKED_ADDRESSES": 10,
+    "MIN_RECOMMENDED_TX_FEE": 0.1
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"
diff --git a/production/mempool-config.testnet.json b/production/mempool-config.testnet.json
index 5f9f3abb9..54be5c20e 100644
--- a/production/mempool-config.testnet.json
+++ b/production/mempool-config.testnet.json
@@ -16,7 +16,8 @@
     "DISK_CACHE_BLOCK_INTERVAL": 1,
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
-    "MAX_TRACKED_ADDRESSES": 10
+    "MAX_TRACKED_ADDRESSES": 10,
+    "MIN_RECOMMENDED_TX_FEE": 0.1
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"
diff --git a/production/mempool-config.testnet4.json b/production/mempool-config.testnet4.json
index 2e79309ed..98f255c68 100644
--- a/production/mempool-config.testnet4.json
+++ b/production/mempool-config.testnet4.json
@@ -16,7 +16,8 @@
     "DISK_CACHE_BLOCK_INTERVAL": 1,
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
-    "MAX_TRACKED_ADDRESSES": 10
+    "MAX_TRACKED_ADDRESSES": 10,
+    "MIN_RECOMMENDED_FEE": 0.1
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"

From fd60913f540102dfacbcc5e6b78ae11547720055 Mon Sep 17 00:00:00 2001
From: Mononaut <github@monospace.live>
Date: Wed, 29 Oct 2025 10:12:28 +0000
Subject: [PATCH 3/7] Add min fee query param to precise fee API

---
 backend/src/api/bitcoin/bitcoin.routes.ts | 12 +++++++++++-
 backend/src/api/fee-api.ts                | 10 +++++-----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/backend/src/api/bitcoin/bitcoin.routes.ts b/backend/src/api/bitcoin/bitcoin.routes.ts
index e6075ffa2..9e6de5dd1 100644
--- a/backend/src/api/bitcoin/bitcoin.routes.ts
+++ b/backend/src/api/bitcoin/bitcoin.routes.ts
@@ -129,7 +129,17 @@ class BitcoinRoutes {
       res.send('Service Unavailable');
       return;
     }
-    const result = feeApi.getPreciseRecommendedFee();
+    let minFee = 1;
+    if (req.query.min) {
+      try {
+        minFee = parseFloat(req.query.min as string);
+      } catch (e) {
+        res.statusCode = 400;
+        res.send('Invalid minimum fee');
+        return;
+      }
+    }
+    const result = feeApi.getPreciseRecommendedFee(minFee);
     res.json(result);
   }
 
diff --git a/backend/src/api/fee-api.ts b/backend/src/api/fee-api.ts
index 12b56595e..489f6a067 100644
--- a/backend/src/api/fee-api.ts
+++ b/backend/src/api/fee-api.ts
@@ -27,17 +27,17 @@ class FeeApi {
     return this.calculateRecommendedFee(pBlocks, mPool);
   }
 
-  public getPreciseRecommendedFee(): RecommendedFees {
+  public getPreciseRecommendedFee(minimum: number = 0): RecommendedFees {
     const pBlocks = projectedBlocks.getMempoolBlocks();
     const mPool = mempool.getMempoolInfo();
 
     // minimum non-zero minrelaytxfee / incrementalrelayfee is 1 sat/kvB = 0.001 sat/vB
-    return this.calculateRecommendedFee(pBlocks, mPool, 0.001);
+    return this.calculateRecommendedFee(pBlocks, mPool, minimum, 0.001);
   }
 
-  public calculateRecommendedFee(pBlocks: MempoolBlock[], mPool: IBitcoinApi.MempoolInfo, minIncrement: number = this.minimumIncrement): RecommendedFees {
+  public calculateRecommendedFee(pBlocks: MempoolBlock[], mPool: IBitcoinApi.MempoolInfo, minimumRecommendation: number = this.defaultFee, minIncrement: number = this.minimumIncrement): RecommendedFees {
     const purgeRate = this.roundUpToNearest(mPool.mempoolminfee * 100000, minIncrement);
-    const minimumFee = Math.max(purgeRate, config.MEMPOOL.MIN_RECOMMENDED_FEE, minIncrement);
+    const minimumFee = Math.max(purgeRate, minimumRecommendation, config.MEMPOOL.MIN_RECOMMENDED_FEE, minIncrement);
 
     if (!pBlocks.length) {
       return {
@@ -78,7 +78,7 @@ class FeeApi {
 
   private optimizeMedianFee(pBlock: MempoolBlock, nextBlock: MempoolBlock | undefined, previousFee?: number, minFee: number = this.defaultFee, minIncrement: number = this.minimumIncrement): number {
     const useFee = previousFee ? (pBlock.medianFee + previousFee) / 2 : pBlock.medianFee;
-    if (pBlock.blockVSize <= 500000 || pBlock.medianFee < 1) {
+    if (pBlock.blockVSize <= 500000 || pBlock.medianFee < minFee) {
       return minFee;
     }
     if (pBlock.blockVSize <= 950000 && !nextBlock) {

From ee1a4ae6e250587e9314e30e20d4f9aeb475b1de Mon Sep 17 00:00:00 2001
From: Mononaut <github@monospace.live>
Date: Wed, 29 Oct 2025 11:24:13 +0000
Subject: [PATCH 4/7] fix fee config

---
 backend/src/__fixtures__/mempool-config.template.json | 3 ++-
 backend/src/__tests__/config.test.ts                  | 1 +
 docker/backend/mempool-config.json                    | 3 ++-
 docker/backend/start.sh                               | 2 ++
 4 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/backend/src/__fixtures__/mempool-config.template.json b/backend/src/__fixtures__/mempool-config.template.json
index 0ca5654a5..93f66ca12 100644
--- a/backend/src/__fixtures__/mempool-config.template.json
+++ b/backend/src/__fixtures__/mempool-config.template.json
@@ -38,7 +38,8 @@
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
     "PRICE_UPDATES_PER_HOUR": 1,
-    "MAX_TRACKED_ADDRESSES": 1
+    "MAX_TRACKED_ADDRESSES": 1,
+    "MIN_RECOMMENDED_FEE": 1
   },
   "CORE_RPC": {
     "HOST": "__CORE_RPC_HOST__",
diff --git a/backend/src/__tests__/config.test.ts b/backend/src/__tests__/config.test.ts
index e0437941f..bb21e8509 100644
--- a/backend/src/__tests__/config.test.ts
+++ b/backend/src/__tests__/config.test.ts
@@ -52,6 +52,7 @@ describe('Mempool Backend Config', () => {
         ALLOW_UNREACHABLE: true,
         PRICE_UPDATES_PER_HOUR: 1,
         MAX_TRACKED_ADDRESSES: 1,
+        MIN_RECOMMENDED_FEE: 1,
       });
 
       expect(config.ELECTRUM).toStrictEqual({ HOST: '127.0.0.1', PORT: 3306, TLS_ENABLED: true });
diff --git a/docker/backend/mempool-config.json b/docker/backend/mempool-config.json
index ee8e329a6..08b684f82 100644
--- a/docker/backend/mempool-config.json
+++ b/docker/backend/mempool-config.json
@@ -38,7 +38,8 @@
     "POOLS_JSON_URL": "__MEMPOOL_POOLS_JSON_URL__",
     "POOLS_UPDATE_DELAY": __MEMPOOL_POOLS_UPDATE_DELAY__,
     "PRICE_UPDATES_PER_HOUR": __MEMPOOL_PRICE_UPDATES_PER_HOUR__,
-    "MAX_TRACKED_ADDRESSES": __MEMPOOL_MAX_TRACKED_ADDRESSES__
+    "MAX_TRACKED_ADDRESSES": __MEMPOOL_MAX_TRACKED_ADDRESSES__,
+    "MIN_RECOMMENDED_FEE": __MEMPOOL_MIN_RECOMMENDED_FEE__
   },
   "CORE_RPC": {
     "HOST": "__CORE_RPC_HOST__",
diff --git a/docker/backend/start.sh b/docker/backend/start.sh
index ae0bc616f..88f4b3161 100755
--- a/docker/backend/start.sh
+++ b/docker/backend/start.sh
@@ -40,6 +40,7 @@ __MEMPOOL_MAX_PUSH_TX_SIZE_WEIGHT__=${MEMPOOL_MAX_PUSH_TX_SIZE_WEIGHT:=4000000}
 __MEMPOOL_ALLOW_UNREACHABLE__=${MEMPOOL_ALLOW_UNREACHABLE:=true}
 __MEMPOOL_PRICE_UPDATES_PER_HOUR__=${MEMPOOL_PRICE_UPDATES_PER_HOUR:=1}
 __MEMPOOL_MAX_TRACKED_ADDRESSES__=${MEMPOOL_MAX_TRACKED_ADDRESSES:=1}
+__MEMPOOL_MIN_RECOMMENDED_FEE__=${MEMPOOL_MIN_RECOMMENDED_FEE:=1}
 
 # CORE_RPC
 __CORE_RPC_HOST__=${CORE_RPC_HOST:=127.0.0.1}
@@ -204,6 +205,7 @@ sed -i "s!__MEMPOOL_MAX_PUSH_TX_SIZE_WEIGHT__!${__MEMPOOL_MAX_PUSH_TX_SIZE_WEIGH
 sed -i "s!__MEMPOOL_ALLOW_UNREACHABLE__!${__MEMPOOL_ALLOW_UNREACHABLE__}!g" mempool-config.json
 sed -i "s!__MEMPOOL_PRICE_UPDATES_PER_HOUR__!${__MEMPOOL_PRICE_UPDATES_PER_HOUR__}!g" mempool-config.json
 sed -i "s!__MEMPOOL_MAX_TRACKED_ADDRESSES__!${__MEMPOOL_MAX_TRACKED_ADDRESSES__}!g" mempool-config.json
+sed -i "s!__MEMPOOL_MIN_RECOMMENDED_FEE__!${__MEMPOOL_MIN_RECOMMENDED_FEE__}!g" mempool-config.json
 
 sed -i "s!__CORE_RPC_HOST__!${__CORE_RPC_HOST__}!g" mempool-config.json
 sed -i "s!__CORE_RPC_PORT__!${__CORE_RPC_PORT__}!g" mempool-config.json

From 38c192405708e05c80c0681becc2ec052d5750b7 Mon Sep 17 00:00:00 2001
From: Mononaut <github@monospace.live>
Date: Thu, 30 Oct 2025 10:36:08 +0000
Subject: [PATCH 5/7] round precise fee recommendations to 3.d.p

---
 backend/src/api/fee-api.ts | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/backend/src/api/fee-api.ts b/backend/src/api/fee-api.ts
index 489f6a067..2a1a26efe 100644
--- a/backend/src/api/fee-api.ts
+++ b/backend/src/api/fee-api.ts
@@ -68,11 +68,11 @@ class FeeApi {
     hourFee = Math.max(hourFee, economyFee);
 
     return {
-      'fastestFee': fastestFee,
-      'halfHourFee': halfHourFee,
-      'hourFee': hourFee,
-      'economyFee': economyFee,
-      'minimumFee': minimumFee,
+      'fastestFee': this.roundToNearest(fastestFee, minIncrement),
+      'halfHourFee': this.roundToNearest(halfHourFee, minIncrement),
+      'hourFee': this.roundToNearest(hourFee, minIncrement),
+      'economyFee': this.roundToNearest(economyFee, minIncrement),
+      'minimumFee': this.roundToNearest(minimumFee, minIncrement),
     };
   }
 

From 89ff47eaa92ec1229c001c65ff364dd3f981de1e Mon Sep 17 00:00:00 2001
From: Mononaut <github@monospace.live>
Date: Thu, 30 Oct 2025 10:43:55 +0000
Subject: [PATCH 6/7] remove default value for ?min fee recommendation query
 param

---
 backend/src/api/bitcoin/bitcoin.routes.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backend/src/api/bitcoin/bitcoin.routes.ts b/backend/src/api/bitcoin/bitcoin.routes.ts
index 9e6de5dd1..69d42f570 100644
--- a/backend/src/api/bitcoin/bitcoin.routes.ts
+++ b/backend/src/api/bitcoin/bitcoin.routes.ts
@@ -129,7 +129,7 @@ class BitcoinRoutes {
       res.send('Service Unavailable');
       return;
     }
-    let minFee = 1;
+    let minFee = 0;
     if (req.query.min) {
       try {
         minFee = parseFloat(req.query.min as string);

From 416f7b45654669f815714b3672c8a44a5d0131ba Mon Sep 17 00:00:00 2001
From: Mononaut <github@monospace.live>
Date: Thu, 30 Oct 2025 10:32:51 +0000
Subject: [PATCH 7/7] remove config.MEMPOOL.MIN_RECOMMENDED_FEE

---
 backend/src/__fixtures__/mempool-config.template.json | 3 +--
 backend/src/__tests__/config.test.ts                  | 3 +--
 backend/src/api/fee-api.ts                            | 7 +++----
 backend/src/config.ts                                 | 2 --
 docker/backend/mempool-config.json                    | 3 +--
 docker/backend/start.sh                               | 2 --
 production/mempool-config.mainnet.json                | 3 +--
 production/mempool-config.signet.json                 | 3 +--
 production/mempool-config.testnet.json                | 3 +--
 production/mempool-config.testnet4.json               | 3 +--
 10 files changed, 10 insertions(+), 22 deletions(-)

diff --git a/backend/src/__fixtures__/mempool-config.template.json b/backend/src/__fixtures__/mempool-config.template.json
index 93f66ca12..0ca5654a5 100644
--- a/backend/src/__fixtures__/mempool-config.template.json
+++ b/backend/src/__fixtures__/mempool-config.template.json
@@ -38,8 +38,7 @@
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
     "PRICE_UPDATES_PER_HOUR": 1,
-    "MAX_TRACKED_ADDRESSES": 1,
-    "MIN_RECOMMENDED_FEE": 1
+    "MAX_TRACKED_ADDRESSES": 1
   },
   "CORE_RPC": {
     "HOST": "__CORE_RPC_HOST__",
diff --git a/backend/src/__tests__/config.test.ts b/backend/src/__tests__/config.test.ts
index bb21e8509..23b3dd346 100644
--- a/backend/src/__tests__/config.test.ts
+++ b/backend/src/__tests__/config.test.ts
@@ -51,8 +51,7 @@ describe('Mempool Backend Config', () => {
         MAX_PUSH_TX_SIZE_WEIGHT: 400000,
         ALLOW_UNREACHABLE: true,
         PRICE_UPDATES_PER_HOUR: 1,
-        MAX_TRACKED_ADDRESSES: 1,
-        MIN_RECOMMENDED_FEE: 1,
+        MAX_TRACKED_ADDRESSES: 1
       });
 
       expect(config.ELECTRUM).toStrictEqual({ HOST: '127.0.0.1', PORT: 3306, TLS_ENABLED: true });
diff --git a/backend/src/api/fee-api.ts b/backend/src/api/fee-api.ts
index 2a1a26efe..2edb8c0e4 100644
--- a/backend/src/api/fee-api.ts
+++ b/backend/src/api/fee-api.ts
@@ -17,7 +17,6 @@ interface RecommendedFees {
 class FeeApi {
   constructor() { }
 
-  defaultFee = isLiquid ? 0.1 : config.MEMPOOL.MIN_RECOMMENDED_FEE;
   minimumIncrement = isLiquid ? 0.1 : 1;
 
   public getRecommendedFee(): RecommendedFees {
@@ -35,9 +34,9 @@ class FeeApi {
     return this.calculateRecommendedFee(pBlocks, mPool, minimum, 0.001);
   }
 
-  public calculateRecommendedFee(pBlocks: MempoolBlock[], mPool: IBitcoinApi.MempoolInfo, minimumRecommendation: number = this.defaultFee, minIncrement: number = this.minimumIncrement): RecommendedFees {
+  public calculateRecommendedFee(pBlocks: MempoolBlock[], mPool: IBitcoinApi.MempoolInfo, minimumRecommendation: number = 0, minIncrement: number = this.minimumIncrement): RecommendedFees {
     const purgeRate = this.roundUpToNearest(mPool.mempoolminfee * 100000, minIncrement);
-    const minimumFee = Math.max(purgeRate, minimumRecommendation, config.MEMPOOL.MIN_RECOMMENDED_FEE, minIncrement);
+    const minimumFee = Math.max(purgeRate, minimumRecommendation, minIncrement);
 
     if (!pBlocks.length) {
       return {
@@ -76,7 +75,7 @@ class FeeApi {
     };
   }
 
-  private optimizeMedianFee(pBlock: MempoolBlock, nextBlock: MempoolBlock | undefined, previousFee?: number, minFee: number = this.defaultFee, minIncrement: number = this.minimumIncrement): number {
+  private optimizeMedianFee(pBlock: MempoolBlock, nextBlock: MempoolBlock | undefined, previousFee: number | undefined, minFee: number, minIncrement: number = this.minimumIncrement): number {
     const useFee = previousFee ? (pBlock.medianFee + previousFee) / 2 : pBlock.medianFee;
     if (pBlock.blockVSize <= 500000 || pBlock.medianFee < minFee) {
       return minFee;
diff --git a/backend/src/config.ts b/backend/src/config.ts
index f3260e788..3fe3db2ee 100644
--- a/backend/src/config.ts
+++ b/backend/src/config.ts
@@ -43,7 +43,6 @@ interface IConfig {
     ALLOW_UNREACHABLE: boolean;
     PRICE_UPDATES_PER_HOUR: number;
     MAX_TRACKED_ADDRESSES: number;
-    MIN_RECOMMENDED_FEE: number;
   };
   ESPLORA: {
     REST_API_URL: string;
@@ -215,7 +214,6 @@ const defaults: IConfig = {
     'ALLOW_UNREACHABLE': true,
     'PRICE_UPDATES_PER_HOUR': 1,
     'MAX_TRACKED_ADDRESSES': 1,
-    'MIN_RECOMMENDED_FEE': 1,
   },
   'ESPLORA': {
     'REST_API_URL': 'http://127.0.0.1:3000',
diff --git a/docker/backend/mempool-config.json b/docker/backend/mempool-config.json
index 08b684f82..ee8e329a6 100644
--- a/docker/backend/mempool-config.json
+++ b/docker/backend/mempool-config.json
@@ -38,8 +38,7 @@
     "POOLS_JSON_URL": "__MEMPOOL_POOLS_JSON_URL__",
     "POOLS_UPDATE_DELAY": __MEMPOOL_POOLS_UPDATE_DELAY__,
     "PRICE_UPDATES_PER_HOUR": __MEMPOOL_PRICE_UPDATES_PER_HOUR__,
-    "MAX_TRACKED_ADDRESSES": __MEMPOOL_MAX_TRACKED_ADDRESSES__,
-    "MIN_RECOMMENDED_FEE": __MEMPOOL_MIN_RECOMMENDED_FEE__
+    "MAX_TRACKED_ADDRESSES": __MEMPOOL_MAX_TRACKED_ADDRESSES__
   },
   "CORE_RPC": {
     "HOST": "__CORE_RPC_HOST__",
diff --git a/docker/backend/start.sh b/docker/backend/start.sh
index 88f4b3161..ae0bc616f 100755
--- a/docker/backend/start.sh
+++ b/docker/backend/start.sh
@@ -40,7 +40,6 @@ __MEMPOOL_MAX_PUSH_TX_SIZE_WEIGHT__=${MEMPOOL_MAX_PUSH_TX_SIZE_WEIGHT:=4000000}
 __MEMPOOL_ALLOW_UNREACHABLE__=${MEMPOOL_ALLOW_UNREACHABLE:=true}
 __MEMPOOL_PRICE_UPDATES_PER_HOUR__=${MEMPOOL_PRICE_UPDATES_PER_HOUR:=1}
 __MEMPOOL_MAX_TRACKED_ADDRESSES__=${MEMPOOL_MAX_TRACKED_ADDRESSES:=1}
-__MEMPOOL_MIN_RECOMMENDED_FEE__=${MEMPOOL_MIN_RECOMMENDED_FEE:=1}
 
 # CORE_RPC
 __CORE_RPC_HOST__=${CORE_RPC_HOST:=127.0.0.1}
@@ -205,7 +204,6 @@ sed -i "s!__MEMPOOL_MAX_PUSH_TX_SIZE_WEIGHT__!${__MEMPOOL_MAX_PUSH_TX_SIZE_WEIGH
 sed -i "s!__MEMPOOL_ALLOW_UNREACHABLE__!${__MEMPOOL_ALLOW_UNREACHABLE__}!g" mempool-config.json
 sed -i "s!__MEMPOOL_PRICE_UPDATES_PER_HOUR__!${__MEMPOOL_PRICE_UPDATES_PER_HOUR__}!g" mempool-config.json
 sed -i "s!__MEMPOOL_MAX_TRACKED_ADDRESSES__!${__MEMPOOL_MAX_TRACKED_ADDRESSES__}!g" mempool-config.json
-sed -i "s!__MEMPOOL_MIN_RECOMMENDED_FEE__!${__MEMPOOL_MIN_RECOMMENDED_FEE__}!g" mempool-config.json
 
 sed -i "s!__CORE_RPC_HOST__!${__CORE_RPC_HOST__}!g" mempool-config.json
 sed -i "s!__CORE_RPC_PORT__!${__CORE_RPC_PORT__}!g" mempool-config.json
diff --git a/production/mempool-config.mainnet.json b/production/mempool-config.mainnet.json
index 301bd0f3f..87f58f916 100644
--- a/production/mempool-config.mainnet.json
+++ b/production/mempool-config.mainnet.json
@@ -23,8 +23,7 @@
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
     "PRICE_UPDATES_PER_HOUR": 12,
-    "MAX_TRACKED_ADDRESSES": 10,
-    "MIN_RECOMMENDED_TX_FEE": 0.1
+    "MAX_TRACKED_ADDRESSES": 10
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"
diff --git a/production/mempool-config.signet.json b/production/mempool-config.signet.json
index d4c45d133..952845ae9 100644
--- a/production/mempool-config.signet.json
+++ b/production/mempool-config.signet.json
@@ -16,8 +16,7 @@
     "DISK_CACHE_BLOCK_INTERVAL": 1,
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
-    "MAX_TRACKED_ADDRESSES": 10,
-    "MIN_RECOMMENDED_TX_FEE": 0.1
+    "MAX_TRACKED_ADDRESSES": 10
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"
diff --git a/production/mempool-config.testnet.json b/production/mempool-config.testnet.json
index 54be5c20e..5f9f3abb9 100644
--- a/production/mempool-config.testnet.json
+++ b/production/mempool-config.testnet.json
@@ -16,8 +16,7 @@
     "DISK_CACHE_BLOCK_INTERVAL": 1,
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
-    "MAX_TRACKED_ADDRESSES": 10,
-    "MIN_RECOMMENDED_TX_FEE": 0.1
+    "MAX_TRACKED_ADDRESSES": 10
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"
diff --git a/production/mempool-config.testnet4.json b/production/mempool-config.testnet4.json
index 98f255c68..2e79309ed 100644
--- a/production/mempool-config.testnet4.json
+++ b/production/mempool-config.testnet4.json
@@ -16,8 +16,7 @@
     "DISK_CACHE_BLOCK_INTERVAL": 1,
     "MAX_PUSH_TX_SIZE_WEIGHT": 4000000,
     "ALLOW_UNREACHABLE": true,
-    "MAX_TRACKED_ADDRESSES": 10,
-    "MIN_RECOMMENDED_FEE": 0.1
+    "MAX_TRACKED_ADDRESSES": 10
   },
   "SYSLOG" : {
     "MIN_PRIORITY": "debug"