Running `Bundler` with `Anvil` fails: `Method not found`.

[sshmaxime]

Describe the bug I'm running an instance of Rundler (running on port 8546) and Anvil (running on port 8545) locally through docker-compose and upon calling eth_estimateUserOperationGas it fails with:

• code: SERVER_ERROR
• message: Method not found

Something that caught my attention is that for reasons that I cannot explain, inside the RPC error payload returned by my server, the URL is set to my anvil node. That being said, I double checked everything and I'm 100% sure that the request goes to Rundler which then seems to pass it to then anvil node. I'm a bit lost here to be honest.

Can anyone help or has any idea where I did something wrong ? Thank you very much !

docker-compose.yaml:

version: "3.8"

x-entrypoint-version: &entrypoint-version
  DISABLE_ENTRY_POINT_V0_6: false
  DISABLE_ENTRY_POINT_V0_7: true

x-priority-fee: &priority-fee
  PRIORITY_FEE_MODE_KIND: base_fee_percent
  PRIORITY_FEE_MODE_VALUE: 0

services:
  anvil:
    platform: linux/amd64
    image: ghcr.io/foundry-rs/foundry
    working_dir: /anvil
    ports:
      - "8545:8545"
    entrypoint: anvil --fork-url https://opt-sepolia.g.alchemy.com/v2/x --host 0.0.0.0
    healthcheck:
      test: ["CMD-SHELL", "cast balance 0x0000000000000000000000000000000000000000"]
      interval: 1s
      retries: 10
      timeout: 10s

  rundler:
    depends_on:
      anvil: 
       condition: service_healthy
    image: rundler
    command: node
    ports:
      - "8546:3000"
      - "8080:8080"
    environment:
      RUST_LOG: info
      ENTRY_POINTS: 0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789
      NODE_HTTP: http://anvil:8545
      CHAIN_ID: 11155420
      UNSAFE: true
      BUILDER_PRIVATE_KEY: 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
      <<: [*entrypoint-version, *priority-fee]

Full JSON RPC error:

{
  "body": {
    "jsonrpc": "2.0",
    "id": 46,
    "error": {
      "code": -32601,
      "message": "Method not found"
    }
  },
  "code": "SERVER_ERROR",
  "error": {
    "code": -32601
  },
  "level": "error",
  "reason": "processing response error",
  "requestBody": {
    "method": "eth_estimateUserOperationGas",
    "params": [
      {
        "sender": "0x31FBdBb4fC17c6819db86A6984b4Dae25c72aD79",
        "nonce": "0x0",
        "initCode": "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",
        "callData": "0xb61d27f6000000000000000000000000770be037c2e8b80e1e2c27ab1dbcf19ecfb0223700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000041249c58b00000000000000000000000000000000000000000000000000000000",
        "callGasLimit": "0x0",
        "verificationGasLimit": "0x0",
        "preVerificationGas": "0x0",
        "maxFeePerGas": "0x0",
        "maxPriorityFeePerGas": "0x0",
        "paymasterAndData": "0x904dff443aac03cefc537a85a98c1cd590dbbcb9f35737941a88598d7ccf0707c8efed312f5b417e7bdeaab028f93999ec4da4f75e3febdd27267129253952f7d776bce9bef1912a5294b55be393375ce4bcf7cd1c",
        "signature": "0x0072912f220eae93da272191aa4ab0854dbb290e81134eb16ab3f37c4e9d5a57a52fac99ac96c21aed9e503a4071fdd0e9b3910d0c3e4022359809a29493f2d69e1c"
      },
      "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789"
    ],
    "id": 46,
    "jsonrpc": "2.0"
  },
  "requestMethod": "POST",
  "url": "http://localhost:8545"
}