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Bundler RPC Methods

Voltaire Bundler exposes standard JSON-RPC API

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eth_ namespace​

Send User Operation​

eth_sendUserOperation asks the bundler to sign and submit a User Operation

Request​

{
  "jsonrpc": "2.0",
  "id": 0,
  "method": "eth_sendUserOperation",
  "params": [
    {
      sender,
      nonce,
      initCode,
      callData,
      callGasLimit,
      verificationGasLimit,
      preVerificationGas,
      maxFeePerGas,
      maxPriorityFeePerGas,
      paymasterAndData,
      signature,
    },
    entrypointAddress,
  ]
}

Response​

It returns the hash of the User Operation. In case of an error, it returns the error message.

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": "0x..." // UserOpHash
}

Estimate User Operation Gas​

eth_estimateUserOperationGas generates and returns an estimate of how much gas is necessary to allow the transaction to complete, given a UserOperation.

Request​

{
  "jsonrpc": "2.0",
  "id": 0,
  "method": "eth_estimateUserOperationGas",
  "params": [
    {
      sender,
      nonce,
      initCode,
      callData,
      callGasLimit,
      verificationGasLimit,
      preVerificationGas,
      maxFeePerGas,
      maxPriorityFeePerGas,
      paymasterAndData,
      signature,
    },
    entrypointAddress,
  ]
}

Response​

It returns estimates for a UserOperation Gas parameters for preVerificationGas, verificationGas, and callGasLimit

{
    "jsonrpc": "2.0",
    "id": 0,
    "result": {
        callGasLimit
        preVerificationGas,
        verificationGas,
    },
}

Get User Operation by hash​

eth_getUserOperationByHash returns a UserOperation by its hash returned from eth_sendUserOperation

Request​

{
  "jsonrpc": "2.0",
  "id": 0,
  "method": "eth_getUserOperationByHash",
  "params": [userOpHash]
}

Response​

The method returns the full UserOperation object as well as the entrypoint address, the block number, the block hash, and transaction Hash.

Get User Operation Receipt​

eth_getUserOperationReceipt returns the receipt of a UserOperation by its hash returned from eth_sendUserOperation

Request​

{
  "jsonrpc": "2.0",
  "id": 0,
  "method": "eth_getUserOperationReceipt",
  "params": [userOpHash]
}

Response​

{
    "jsonrpc": "2.0",
    "id": 0,
    "result": {
        userOpHash,
        sender,
        nonce,
        paymaster,
        actualGasCost, // actual (gas price * gas used) of the user operation
        actualGasUsed, // actual gas used of the user operation
        success, // user operation revert status
        reason, // If reverted, user operation revert reason
        logs,
        receipt, // The TransactionReceipt object. Note that the returned TransactionReceipt is for the entire bundle, not only for this UserOperation
    }
}

Get Chain ID​

eth_chainId returns the chain ID of the current network

Request​

{
  "jsonrpc": "2.0",
  "id": 0,
  "method": "eth_chainId",
  "params": []
}

Response​

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": "0x1", // Chain ID
}

Get Supported EntryPoints​

eth_supportedEntryPoints returns an array of the entryPoint addresses supported by the bundler

Request​

{
  "jsonrpc": "2.0",
  "id": 0,
  "method": "eth_supportedEntryPoints",
  "params": []
}

Response​

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": ["0x00...", "0x01..."],
}