NOTES.md

notes: some gotchas along the way

goal is to get bundlers / paymasters working on a local devnet on anvil.

SenderCreator deployment

SenderCreator is initialized when constructing EntryPoint, so just doing vm.etch with the EntryPoint bytecode is insufficient. Need to etch bytecode into the expected location of SenderCreator

Since KernelFactory is stateful, need to create stake for entrypoint

skandha doesn't seem to care though? MinStake seems to be 0

skandha with aa-sdk for eth_estimateUserOperationGas

skandha eth_estimateUserOperationGas requires all fields to be present and valid. not sure if that's upt to spec. aa-sdk doesn't fill all values (ie. preVerificationGas, callGasLimit). Pretty sure rundler doesn't care

valid for skandha

{
    "jsonrpc": "2.0",
    "id": 45,
    "method": "eth_estimateUserOperationGas",
    "params": [
        {
        "initCode": "0xcDb9f4eF54906dFa05cbe71c65b029b171732A765fbfb9cf00000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c80000000000000000000000000000000000000000000000000000000000000000",
        "sender": "0xC42241df3D72a376c3976AEa40B56AE22B9fE549",
        "nonce": "0x0",
        "callData": "0xb61d27f600000000000000000000000070f13196950bdabc3a243088e8ee1db19c66467d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000041249c58b00000000000000000000000000000000000000000000000000000000",
        "signature": "0xfffffffffffffffffffffffffffffff0000000000000000000000000000000007aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1c",
        "maxFeePerGas": "0x50aeed97",
        "maxPriorityFeePerGas": "0x50343a08",
        "callGasLimit": "0x1",
        "paymasterAndData": "0x",
        "preVerificationGas": "0x0",
        "verificationGasLimit": "0x0"
        },
        "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789"
    ]
}

response

{
    "jsonrpc": "2.0",
    "id": 45,
    "result": {
        "preVerificationGas": "0xaf18",
        "verificationGasLimit": "0x49a8b",
        "verificationGas": "0x49a8b",
        "validUntil": "0xffffffffffff",
        "callGasLimit": "0x1b1f6",
        "maxFeePerGas": "0x59682f0e",
        "maxPriorityFeePerGas": "0x59682f00"
    }
}

invalid

{
  "jsonrpc": "2.0",
  "id": 45,
  "method": "eth_estimateUserOperationGas",
  "params": [
    {
      "initCode": "0xcDb9f4eF54906dFa05cbe71c65b029b171732A765fbfb9cf00000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c80000000000000000000000000000000000000000000000000000000000000000",
      "sender": "0xC42241df3D72a376c3976AEa40B56AE22B9fE549",
      "nonce": "0x0",
      "callData": "0xb61d27f600000000000000000000000070f13196950bdabc3a243088e8ee1db19c66467d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000041249c58b00000000000000000000000000000000000000000000000000000000",
      "signature": "0xfffffffffffffffffffffffffffffff0000000000000000000000000000000007aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1c",
      "paymasterAndData": "0x",
      "maxFeePerGas": "0x5edcdff9",
      "maxPriorityFeePerGas": "0x598f7c52"
    },
    "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789"
  ]
}

valid request for rundler

{
    "jsonrpc": "2.0",
    "id": 45,
    "method": "eth_estimateUserOperationGas",
    "params": [
        {
        "initCode": "0xcDb9f4eF54906dFa05cbe71c65b029b171732A765fbfb9cf00000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c80000000000000000000000000000000000000000000000000000000000000000",
        "sender": "0xC42241df3D72a376c3976AEa40B56AE22B9fE549",
        "nonce": "0x0",
        "callData": "0xb61d27f600000000000000000000000070f13196950bdabc3a243088e8ee1db19c66467d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000041249c58b00000000000000000000000000000000000000000000000000000000",
        "signature": "0xfffffffffffffffffffffffffffffff0000000000000000000000000000000007aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1c",
        "maxFeePerGas": "0x50aeed97",
        "maxPriorityFeePerGas": "0x50343a08",
        "paymasterAndData": "0x"

        },
        "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789"
    ]
}

response

{
    "jsonrpc": "2.0",
    "result": {
        "preVerificationGas": "0xb6e8",
        "verificationGasLimit": "0x3fdc6",
        "callGasLimit": "0x13000"
    },
    "id": 45
}

aa-sdk adds weird headers to fetch requests

'Alchemy-Aa-Sdk-Signer', 'Alchemy-Aa-Sdk-Factory-Address', 'Alchemy-Aa-Sdk-Version'

rundler doesn't support anvil because tracing doesn't work?

Think it requires geth - it can't simulate UO so it sendUserOperation fails.

alchemyplatform/rundler#470

{
    "jsonrpc": "2.0",
    "error": {
        "code": -32603,
        "message": "(code: -32602, message: non-default tracer not supported yet, data: None)"
    },
    "id": 11
}

debug_traceCall issue

• most bundlers require debug_traceCall options to run simulation
• either foundry-rs/foundry#5855 lands
• or run bundler in unsafeMode (without simulation)
  • skandha supports unsafeMode
  • https://github.com/eth-infinitism/bundler supports --unsafe
  • rundler has one planned alchemyplatform/rundler#470

transeptor seems to require slightly higher preverification gas?

required bumping preVerificationGas for transaction to go through