feat: Replace ethers with viem

.vscode/settings.json

@@ -4,5 +4,6 @@
         "Etherspot",
         "sidechains",
         "Sparknet"
-    ]
+    ],
+    "claudeCodeChat.permissions.yoloMode": false
 }

backend/CHANGELOG.md

@@ -1,4 +1,12 @@
 # Changelog
+## [4.2.0] - 2025-09-19
+- Removed unused code in the repository
+- Removed the mode 'erc20' on paymaster routes since it used pimlico paymaster(v1)
+- Removed the usage on ethers for the paymaster routes and the usage on ethers is limited to only utils section
+- Added viem package to replace ethers
+- Changed the build version to use bun instead of node.js
+- Changed the docker file to use bun image and build the arka backend
+
 ## [4.1.2] - 2025-06-05
 - Fetch from coingecko only if coingecko-token-repository records are available else skip calling the api
 

backend/Dockerfile

@@ -1,25 +1,23 @@
-FROM node:18-alpine AS deps
-# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
-RUN apk add --no-cache libc6-compat
+FROM oven/bun:1-alpine AS deps
+RUN apk update && apk add --no-cache g++ nodejs npm musl make musl-dev python3 git py3-setuptools && rm -rf /var/cache/apk/*
 WORKDIR /app
-COPY package.json ./
-RUN npm install
+COPY package.json bun.lock* ./
+RUN bun install --frozen-lockfile
 
-FROM node:18-alpine AS builder
+FROM oven/bun:1-alpine AS builder
 ARG APP_ENV
 WORKDIR /app
 COPY . .
 COPY --from=deps /app/node_modules ./node_modules
-RUN npm run build
+RUN bun run build
 
-FROM node:18-alpine AS runner
+FROM oven/bun:1-alpine AS runner
 WORKDIR /usr/app
 ARG APP_ENV
 COPY --from=builder /app/build ./build
 COPY ./migrations ./build/migrations
 COPY package.json ./
 COPY --from=builder /app/config.json.default /usr/app/config.json
-RUN npm install
 USER root
 ENV NODE_ENV="production"
-CMD ["npm", "start"]
+CMD ["bun", "start"]

backend/indexer/ponder.config.ts

@@ -1,6 +1,6 @@
 import { createConfig } from "@ponder/core";
 import { http } from "viem";
-import SupportedNetworks from "../config.json" assert { type: "json" };
+import SupportedNetworks from "../config.json";
 import { EtherspotPaymasterAbi } from "./EtherspotAbi";
 
 export default createConfig({

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "arka",
-  "version": "4.1.2",
+  "version": "4.2.0",
   "description": "ARKA - (Albanian for Cashier's case) is the first open source Paymaster as a service software",
   "type": "module",
   "directories": {
@@ -10,16 +10,17 @@
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "check:types": "tsc --noEmit",
-    "build": "esbuild `find src \\( -name '*.ts' \\)` --platform=node --outdir=build --resolve-extensions=.js && cp -r ./migrations ./build/",
+    "build": "bun build src/index.ts --outdir build --target node && cp -r ./migrations ./build/",
     "build:docker:prod": "docker build . -t my-fastify-app --build-arg APP_ENV=production",
-    "start": "node build",
-    "migrate": "node scripts/migration.cjs",
-    "dev": "tsx watch src | pino-pretty --colorize",
-    "pretest": "npm run build",
-    "test": "jest"
+    "start": "bun build/index.js",
+    "migrate": "bun run scripts/migration.cjs",
+    "dev": "tsx watch src/index.ts | pino-pretty --colorize",
+    "pretest": "bun run build",
+    "test": "bun test",
+    "postinstall": "node -e \"try { require('esbuild/install') } catch (e) { console.log('Using JS fallback for esbuild') }\""
   },
   "engines": {
-    "node": ">=16.0.0"
+    "bun": ">=1.0.0"
   },
   "keywords": [
     "nodejs",
@@ -39,7 +40,6 @@
     "crypto": "^1.0.1",
     "dotenv": "16.0.3",
     "env-schema": "5.1.1",
-    "ethers": "5.7.2",
     "fastify": "4.24.3",
     "fastify-cron": "1.3.1",
     "fastify-healthcheck": "4.4.0",
@@ -49,14 +49,15 @@
     "node-fetch": "3.3.2",
     "node-pg-migrate": "^7.4.0",
     "pg": "^8.12.0",
+    "pg-hstore": "^2.3.4",
     "postgrator": "^7.2.0",
     "sequelize": "^6.37.3",
     "sqlite": "5.1.1",
     "sqlite3": "5.1.7-rc.0",
     "ts-node": "^10.9.2",
     "typescript": "^5.4.5",
     "umzug": "^3.8.1",
-    "viem": "2.7.6"
+    "viem": "2.27.0"
   },
   "devDependencies": {
     "@babel/core": "7.23.2",

backend/src/constants/MultitokenPaymaster.ts

@@ -1,6 +1,6 @@
-import { BigNumber } from "ethers";
+import { toHex } from 'viem';
 
-export const UnaccountedCost = BigNumber.from("45000").toHexString();
+export const UnaccountedCost = toHex(45000n);
 
 interface TokenInfo {
     decimals: number;

backend/src/constants/Token.ts

@@ -142,50 +142,6 @@ export const CustomDeployedPaymasters: Record<number, Record<string, string>> =
     }
 }
 
-export const PAYMASTER_ADDRESS: Record<number, Record<string, string>> = {
-    1: {
-        USDC: "0x0000000000fABFA8079AB313D1D14Dcf4D15582a"
-    },
-    56: {
-        USDC: "0x0000000000db7995889f54d72dac9d36a9f7f467"
-    },
-    100: {
-        USDC: "0x000000000034b78bfe02be30ae4d324c8702803d"
-    },
-    137: {
-        eUSDC: "0xa683b47e447De6c8A007d9e294e87B6Db333Eb18",
-        USDC: "0x00000000003011eef3f79892ba3d521e5ba5c5c0"
-    },
-    8453: {
-        USDC: "0x939263eafe57038a072cb4edd6b25dd81a8a6c56"
-    },
-    84532: {
-        USDC: "0x0000000000dd6dd248ab5487218e1c2d7fbb29c9"
-    },
-    42161: {
-        eUSDC: "0x49EE41bC335Fb36be46A17307dcFe536A3494644",
-        USDC: "0x000000000058e13d711bb4706bf822a79c35d8b1"
-    },
-    59144: {
-        USDC: "0x0000000000Cf745CB08EE7A6F0A2D74BB942E414"
-    },
-    10: {
-        USDC: "0x0000000000fce6614d3c6f679e48c9cdd09aa634"
-    },
-    11155111: {
-        USDC: "0x0000000000325602a77416a16136fdafd04b299f"
-    },
-    80001: {
-        USDC: "0x000000000009B901DeC1aaB9389285965F49D387"
-    },
-    114: {
-        USDT: "0xED35f8fa422Ba95A52A000236F1EAFd7e4fA4D52"
-    },
-    14: {
-        eUSDC: "0xA5589D278778Eaae346383dD710D7913d8A6a2aA"
-    }
-}
-
 /**
  * Example Structure for adding deployed multi-token paymasters on AWS secrets manager
  */