MTP_Bug_Fix

backend/CHANGELOG.md

@@ -1,4 +1,8 @@
 # Changelog
+## [3.1.6] - 2025-04-02
+### Fixes
+- Fixed bug in paymaster estimation for multiTokenPaymaster getERC20Quotes API
+
 ## [3.1.5] - 2025-03-24
 ### Fixes
 - Added all tokens used in multiTokenPaymaster to have decimals in constants rather than fetching from rpc 

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "arka",
-  "version": "3.1.5",
+  "version": "3.1.6",
   "description": "ARKA - (Albanian for Cashier's case) is the first open source Paymaster as a service software",
   "type": "module",
   "directories": {

backend/src/paymaster/index.ts

@@ -550,6 +550,7 @@ export class Paymaster {
     bundlerRpc: string,
     oracleName: string,
     nativeOracleAddress: string,
+    signer: Wallet,
     log?: FastifyBaseLogger
   ) {
     try {
@@ -574,6 +575,23 @@ export class Paymaster {
       let ETHUSDPrice: any, ETHUSDPriceDecimal;
       const paymasterKey = Object.keys(multiTokenPaymasters[chainId])[0];
       let response, unaccountedCost;
+      const validUntil = new Date();
+      const validAfter = new Date();
+      const hex = (Number((validUntil.valueOf() / 1000).toFixed(0)) + 600).toString(16);
+      const hex1 = (Number((validAfter.valueOf() / 1000).toFixed(0)) - 60).toString(16);
+      let str = '0x'
+      let str1 = '0x'
+      for (let i = 0; i < 14 - hex.length; i++) {
+        str += '0';
+      }
+      for (let i = 0; i < 14 - hex1.length; i++) {
+        str1 += '0';
+      }
+      str += hex;
+      str1 += hex1;
+      const paymasterContract = new ethers.Contract(multiTokenPaymasters[chainId][paymasterKey], MultiTokenPaymasterAbi, provider);
+      // Assuming the token price is 1 USD since this is just used for the gas estimation and the paymasterAndData generated will not be sent on response
+      userOp.paymasterAndData = await this.getPaymasterAndDataForMultiTokenPaymaster(userOp, str, str1, paymasterKey, '100000000', paymasterContract, signer, chainId);
       if (oracleName === "chainlink") {
         const res = await this.getEstimateUserOperationGasAndData(
           provider,

backend/src/routes/paymaster-routes.ts

@@ -189,7 +189,9 @@ const paymasterRoutes: FastifyPluginAsync<PaymasterRoutesOpts> = async (server,
           if (!multiTokenPaymasters[chainId]) return reply.code(ReturnCode.FAILURE).send({ error: ErrorMessage.MULTI_NOT_DEPLOYED + chainId })
           if (networkConfig.MultiTokenPaymasterOracleUsed == "chainlink" && !NativeOracles[chainId])
             throw new Error("Native Oracle address not set for this chainId")
-          result = await paymaster.getQuotesMultiToken(userOp, entryPoint, chainId, multiTokenPaymasters, tokens_list, multiTokenOracles, bundlerUrl, networkConfig.MultiTokenPaymasterOracleUsed, NativeOracles[chainId], server.log);
+          const provider = new providers.JsonRpcProvider(bundlerUrl);
+          const signer = new Wallet(privateKey, provider)
+          result = await paymaster.getQuotesMultiToken(userOp, entryPoint, chainId, multiTokenPaymasters, tokens_list, multiTokenOracles, bundlerUrl, networkConfig.MultiTokenPaymasterOracleUsed, NativeOracles[chainId], signer, server.log);
         }
         else {
           if (gasToken && ethers.utils.isAddress(gasToken)) gasToken = ethers.utils.getAddress(gasToken)