check minimum relay fee in bitcoin fee config

Author: piatoss3612

packages/hooks-bitcoin/src/tx/fee.ts

@@ -13,7 +13,10 @@ import { action, computed, makeObservable, observable } from "mobx";
 import { useState } from "react";
 import { CoinPretty, Dec } from "@keplr-wallet/unit";
 import { InsufficientFeeError } from "./errors";
-import { BitcoinQueriesStore } from "@keplr-wallet/stores-bitcoin";
+import {
+  BitcoinQueriesStore,
+  MIN_RELAY_FEE,
+} from "@keplr-wallet/stores-bitcoin";
 
 export class FeeConfig extends TxChainSetter implements IFeeConfig {
   @observable
@@ -88,10 +91,18 @@ export class FeeConfig extends TxChainSetter implements IFeeConfig {
         return undefined;
       }
 
-      return new CoinPretty(
-        this.amountConfig.currency,
-        this.txSizeConfig.txSize * this.feeRateConfig.feeRate + this.remainder
+      const feeDec = new Dec(
+        Math.ceil(this.txSizeConfig.txSize * this.feeRateConfig.feeRate) +
+          this.remainder
       );
+
+      const minRelayFeeDec = new Dec(MIN_RELAY_FEE);
+
+      if (feeDec.lt(minRelayFeeDec)) {
+        return new CoinPretty(this.amountConfig.currency, minRelayFeeDec);
+      }
+
+      return new CoinPretty(this.amountConfig.currency, feeDec);
     }
 
     return new CoinPretty(this.amountConfig.currency, this._value);