feat: centralize fee logic and add Bitcoin deposit forwarding

src/integration/blockchain/bitcoin/node/bitcoin-based-client.ts

@@ -53,13 +53,20 @@ export abstract class BitcoinBasedClient extends NodeClient implements CoinOnly
     return { outTxId: result?.txid ?? '', feeAmount };
   }
 
-  async sendMany(payload: { addressTo: string; amount: number }[], feeRate: number): Promise<string> {
+  async sendMany(
+    payload: { addressTo: string; amount: number }[],
+    feeRate: number,
+    inputs?: Array<{ txid: string; vout: number }>,
+    subtractFeeFromOutputs?: number[],
+  ): Promise<string> {
     const outputs = payload.map((p) => ({ [p.addressTo]: p.amount }));
 
     const options = {
       replaceable: true,
       change_address: this.walletAddress,
       ...(this.nodeConfig.allowUnconfirmedUtxos && { include_unsafe: true }),
+      ...(inputs && { inputs, add_inputs: false }),
+      ...(subtractFeeFromOutputs && { subtract_fee_from_outputs: subtractFeeFromOutputs }),
     };
 
     const result = await this.callNode(() => this.rpc.send(outputs, null, null, feeRate, options), true);

src/integration/blockchain/bitcoin/node/node-client.ts

@@ -158,6 +158,11 @@ export abstract class NodeClient extends BlockchainClient {
     return this.callNode(() => this.rpc.listUnspent(minConf), true);
   }
 
+  async getUtxoForAddresses(addresses: string[], includeUnconfirmed = false): Promise<UTXO[]> {
+    const minConf = includeUnconfirmed ? 0 : 1;
+    return this.callNode(() => this.rpc.listUnspent(minConf, 9999999, addresses), true);
+  }
+
   async getBalance(): Promise<number> {
     // Include unconfirmed UTXOs when configured
     // Bitcoin Core's getbalances returns: trusted (confirmed + own unconfirmed), untrusted_pending (others' unconfirmed), immature (coinbase)

src/integration/blockchain/bitcoin/services/bitcoin-based-fee.service.ts

@@ -9,6 +9,12 @@ export interface TxFeeRateResult {
   feeRate?: number;
 }
 
+export interface FeeConfig {
+  allowUnconfirmedUtxos: boolean;
+  cpfpFeeMultiplier: number;
+  defaultFeeMultiplier: number;
+}
+
 export abstract class BitcoinBasedFeeService {
   private readonly logger = new DfxLogger(BitcoinBasedFeeService);
 
@@ -17,6 +23,8 @@ export abstract class BitcoinBasedFeeService {
 
   constructor(protected readonly client: NodeClient) {}
 
+  protected abstract get feeConfig(): FeeConfig;
+
   async getRecommendedFeeRate(): Promise<number> {
     return this.feeRateCache.get(
       'fastestFee',
@@ -74,4 +82,13 @@ export abstract class BitcoinBasedFeeService {
 
     return results;
   }
+
+  async getSendFeeRate(): Promise<number> {
+    const baseRate = await this.getRecommendedFeeRate();
+
+    const { allowUnconfirmedUtxos, cpfpFeeMultiplier, defaultFeeMultiplier } = this.feeConfig;
+    const multiplier = allowUnconfirmedUtxos ? cpfpFeeMultiplier : defaultFeeMultiplier;
+
+    return baseRate * multiplier;
+  }
 }

src/integration/blockchain/bitcoin/services/bitcoin-fee.service.ts

@@ -1,5 +1,6 @@
 import { Injectable } from '@nestjs/common';
-import { BitcoinBasedFeeService } from './bitcoin-based-fee.service';
+import { Config } from 'src/config/config';
+import { BitcoinBasedFeeService, FeeConfig } from './bitcoin-based-fee.service';
 import { BitcoinNodeType, BitcoinService } from './bitcoin.service';
 
 export { TxFeeRateResult, TxFeeRateStatus } from './bitcoin-based-fee.service';
@@ -9,4 +10,8 @@ export class BitcoinFeeService extends BitcoinBasedFeeService {
   constructor(bitcoinService: BitcoinService) {
     super(bitcoinService.getDefaultClient(BitcoinNodeType.BTC_INPUT));
   }
+
+  protected get feeConfig(): FeeConfig {
+    return Config.blockchain.default;
+  }
 }

src/integration/blockchain/firo/firo-client.ts

@@ -50,10 +50,9 @@ export class FiroClient extends BitcoinBasedClient {
   // Firo's account-based getbalance with '' returns only the default account, which can be negative.
   // Use listunspent filtered to the liquidity and payment addresses for an accurate spendable balance.
   async getBalance(): Promise<number> {
-    const minConf = this.nodeConfig.allowUnconfirmedUtxos ? 0 : 1;
-    const utxos = await this.callNode(
-      () => this.rpc.listUnspent(minConf, 9999999, [this.walletAddress, this.paymentAddress]),
-      true,
+    const utxos = await this.getUtxoForAddresses(
+      [this.walletAddress, this.paymentAddress],
+      this.nodeConfig.allowUnconfirmedUtxos,
     );
 
     return utxos?.reduce((sum, u) => sum + u.amount, 0) ?? 0;
@@ -113,10 +112,9 @@ export class FiroClient extends BitcoinBasedClient {
     const outputTotal = payload.reduce((sum, p) => sum + p.amount, 0);
 
     // Get UTXOs from liquidity and payment addresses (excludes deposit address UTXOs)
-    const minConf = this.nodeConfig.allowUnconfirmedUtxos ? 0 : 1;
-    const utxos = await this.callNode(
-      () => this.rpc.listUnspent(minConf, 9999999, [this.walletAddress, this.paymentAddress]),
-      true,
+    const utxos = await this.getUtxoForAddresses(
+      [this.walletAddress, this.paymentAddress],
+      this.nodeConfig.allowUnconfirmedUtxos,
     );
 
     if (!utxos || utxos.length === 0) {

src/integration/blockchain/firo/services/firo-fee.service.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@nestjs/common';
 import { Config } from 'src/config/config';
-import { BitcoinBasedFeeService } from '../../bitcoin/services/bitcoin-based-fee.service';
+import { BitcoinBasedFeeService, FeeConfig } from '../../bitcoin/services/bitcoin-based-fee.service';
 import { FiroService } from './firo.service';
 
 @Injectable()
@@ -9,12 +9,7 @@ export class FiroFeeService extends BitcoinBasedFeeService {
     super(firoService.getDefaultClient());
   }
 
-  async getSendFeeRate(): Promise<number> {
-    const baseRate = await this.getRecommendedFeeRate();
-
-    const { allowUnconfirmedUtxos, cpfpFeeMultiplier, defaultFeeMultiplier } = Config.blockchain.firo;
-    const multiplier = allowUnconfirmedUtxos ? cpfpFeeMultiplier : defaultFeeMultiplier;
-
-    return baseRate * multiplier;
+  protected get feeConfig(): FeeConfig {
+    return Config.blockchain.firo;
   }
 }

src/subdomains/core/payment-link/services/payment-balance.service.ts

@@ -1,5 +1,7 @@
 import { Injectable, OnModuleInit } from '@nestjs/common';
 import { Config } from 'src/config/config';
+import { BitcoinFeeService } from 'src/integration/blockchain/bitcoin/services/bitcoin-fee.service';
+import { BitcoinNodeType } from 'src/integration/blockchain/bitcoin/services/bitcoin.service';
 import { CardanoUtil } from 'src/integration/blockchain/cardano/cardano.util';
 import { BlockchainTokenBalance } from 'src/integration/blockchain/shared/dto/blockchain-token-balance.dto';
 import { Blockchain } from 'src/integration/blockchain/shared/enums/blockchain.enum';
@@ -43,6 +45,7 @@ export class PaymentBalanceService implements OnModuleInit {
   constructor(
     private readonly assetService: AssetService,
     private readonly blockchainRegistryService: BlockchainRegistryService,
+    private readonly bitcoinFeeService: BitcoinFeeService,
   ) {}
 
   onModuleInit() {
@@ -151,7 +154,7 @@ export class PaymentBalanceService implements OnModuleInit {
   }
 
   async forwardDeposits() {
-    const chainsWithoutForwarding = [Blockchain.BITCOIN, Blockchain.FIRO, ...this.chainsWithoutPaymentBalance];
+    const chainsWithoutForwarding = [Blockchain.FIRO, ...this.chainsWithoutPaymentBalance];
 
     const paymentAssets = await this.assetService
       .getPaymentAssets()
@@ -171,6 +174,10 @@ export class PaymentBalanceService implements OnModuleInit {
   }
 
   private async forwardDeposit(asset: Asset, balance: number): Promise<string> {
+    if (asset.blockchain === Blockchain.BITCOIN) {
+      return this.forwardBitcoinDeposit();
+    }
+
     const account = this.getPaymentAccount(asset.blockchain);
     const client = this.blockchainRegistryService.getClient(asset.blockchain) as EvmClient | SolanaClient | TronClient;
 
@@ -179,6 +186,23 @@ export class PaymentBalanceService implements OnModuleInit {
       : client.sendTokenFromAccount(account, client.walletAddress, asset, balance);
   }
 
+  private async forwardBitcoinDeposit(): Promise<string> {
+    const client = this.blockchainRegistryService.getBitcoinClient(Blockchain.BITCOIN, BitcoinNodeType.BTC_INPUT);
+    const paymentAddress = Config.payment.bitcoinAddress;
+    const outputAddress = Config.blockchain.default.btcOutput.address;
+    const feeRate = await this.bitcoinFeeService.getSendFeeRate();
+
+    // only use UTXOs from the payment address (not deposit UTXOs on the same wallet)
+    const utxos = await client.getUtxoForAddresses([paymentAddress], true);
+    if (!utxos.length) return '';
+
+    const inputs = utxos.map((u) => ({ txid: u.txid, vout: u.vout }));
+    const utxoBalance = utxos.reduce((sum, u) => sum + u.amount, 0);
+
+    // sweep all UTXOs: send full balance and let Bitcoin Core subtract the fee from the output
+    return client.sendMany([{ addressTo: outputAddress, amount: utxoBalance }], feeRate, inputs, [0]);
+  }
+
   private getPaymentAccount(chain: Blockchain): WalletAccount {
     switch (chain) {
       case Blockchain.ETHEREUM:

src/subdomains/supporting/dex/services/dex-bitcoin.service.ts

@@ -21,7 +21,7 @@ export class DexBitcoinService {
   }
 
   async sendUtxoToMany(payout: { addressTo: string; amount: number }[]): Promise<string> {
-    const feeRate = await this.feeService.getRecommendedFeeRate();
+    const feeRate = await this.feeService.getSendFeeRate();
     return this.client.sendMany(payout, feeRate);
   }
 

src/subdomains/supporting/dex/services/dex-firo.service.ts

@@ -21,7 +21,7 @@ export class DexFiroService {
   }
 
   async sendUtxoToMany(payout: { addressTo: string; amount: number }[]): Promise<string> {
-    const feeRate = await this.getFeeRate();
+    const feeRate = await this.feeService.getSendFeeRate();
     return this.client.sendMany(payout, feeRate);
   }
 
@@ -44,10 +44,6 @@ export class DexFiroService {
 
   //*** HELPER METHODS ***//
 
-  private async getFeeRate(): Promise<number> {
-    return this.feeService.getSendFeeRate();
-  }
-
   private async getPendingAmount(): Promise<number> {
     const pendingOrders = await this.liquidityOrderRepo.findBy({
       isComplete: false,

src/subdomains/supporting/payin/services/payin-bitcoin.service.ts

@@ -99,7 +99,7 @@ export class PayInBitcoinService extends PayInBitcoinBasedService {
       input.inTxId,
       input.sendingAmount,
       input.txSequence,
-      await this.feeService.getRecommendedFeeRate(),
+      await this.feeService.getSendFeeRate(),
     );
   }
 

src/subdomains/supporting/payin/services/payin-firo.service.ts

@@ -90,7 +90,7 @@ export class PayInFiroService extends PayInBitcoinBasedService {
   }
 
   async sendTransfer(input: CryptoInput): Promise<{ outTxId: string; feeAmount: number }> {
-    const feeRate = await this.feeService.getRecommendedFeeRate();
+    const feeRate = await this.feeService.getSendFeeRate();
     return this.client.send(
       input.destinationAddress.address,
       input.inTxId,

src/subdomains/supporting/payout/services/payout-bitcoin.service.ts

@@ -1,5 +1,4 @@
 import { Injectable } from '@nestjs/common';
-import { Config } from 'src/config/config';
 import { BitcoinClient } from 'src/integration/blockchain/bitcoin/node/bitcoin-client';
 import { BitcoinFeeService } from 'src/integration/blockchain/bitcoin/services/bitcoin-fee.service';
 import { BitcoinNodeType, BitcoinService } from 'src/integration/blockchain/bitcoin/services/bitcoin.service';
@@ -44,12 +43,6 @@ export class PayoutBitcoinService extends PayoutBitcoinBasedService {
   }
 
   async getCurrentFeeRate(): Promise<number> {
-    const baseRate = await this.feeService.getRecommendedFeeRate();
-
-    // Use higher multiplier when unconfirmed UTXOs are enabled (CPFP effect)
-    const { allowUnconfirmedUtxos, cpfpFeeMultiplier, defaultFeeMultiplier } = Config.blockchain.default;
-    const multiplier = allowUnconfirmedUtxos ? cpfpFeeMultiplier : defaultFeeMultiplier;
-
-    return baseRate * multiplier;
+    return this.feeService.getSendFeeRate();
   }
 }