All RPC methods listed here are required to be compliant as an ERC-4337 bundler.

eth_sendUserOperation - send a user operation
eth_estimateUserOperationGas - estimate the gas required for a user operation
eth_getUserOperationByHash - fetch the user operation receipt and corresponding bundler transaction data
eth_getUserOperationReceipt - fetch the user operation receipt
eth_supportedEntryPoints - returns the EntryPoints supported by the bundler

eth_sendUserOperation

Used to submit a UserOperation to the mempool. It returns the userOpHash if the userOp was accepted otherwise returns an error.

Try it here: eth_sendUserOperation

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_sendUserOperation",
  "params": [
    // UserOperation object
    {
      sender,
      nonce,
      initCode,
      callData,
      callGasLimit,
      verificationGasLimit,
      preVerificationGas,
      maxFeePerGas,
      maxPriorityFeePerGas,
      paymasterAndData,
      signature
    },

    // Supported EntryPoint address
    entryPoint
  ]
}

{
  "jsonrpc": "2.0",
  "id": 1,

  // UserOpHash
  "result": "0x..."
}

eth_estimateUserOperationGas

This method returns estimates for PreVerificationGas, VerificationGas, and CallGasLimit given a UserOperation and EntryPoint address. The signature field and current gas values will not be validated although there should be dummy values in place for the most reliable results (e.g. a signature with the correct length and format).

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_estimateUserOperationGas",
  "params": [
    // UserOperation object
    {
      sender,
      nonce,
      initCode,
      callData,
      callGasLimit,
      verificationGasLimit,
      preVerificationGas,
      maxFeePerGas,
      maxPriorityFeePerGas,
      paymasterAndData,
      signature
    },

    // Supported EntryPoint address
    entryPoint
  ]
}

{
  "jsonrpc": "2.0",
  "id": 1,

  // The return values are the hex strings for wei values.
  "result": {
		"PreVerificationGas": "0x..",
		"VerificationGas":    "0x..",
		"CallGasLimit":       "0x..",
	}
}

eth_getUserOperationByHash

Fetches the UserOperation and transaction context based on a given userOpHash returned from eth_sendUserOperation.

Try it here: eth_getUserOperationByHash

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getUserOperationByHash",
  "params": [userOpHash]
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getUserOperationByHash",
  "params": [
    // UserOperation object
    {
      sender,
      nonce,
      initCode,
      callData,
      callGasLimit,
      verificationGasLimit,
      preVerificationGas,
      maxFeePerGas,
      maxPriorityFeePerGas,
      paymasterAndData,
      signature
    },

    // The EntryPoint address
    entryPoint,
    // The block number this UserOperation was included in
    blockNumber,
    // The block hash this UserOperation was included in
    blockHash,
    // The transaction this UserOperation was included in
    transactionHash,
  ]
}

eth_getUserOperationReceipt

Fetches the UserOperation receipt based on a given userOpHash returned from eth_sendUserOperation.

Try it here: eth_getUserOperationReceipt

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getUserOperationReceipt",
  "params": [userOpHash]
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getUserOperationReceipt",
  "params": [
    // The hash of the UserOperation
    userOpHash,
    // The EntryPoint address
    entryPoint,
    // The contract account address
    sender,
    // nonce of the UserOperation
    nonce,
    // The paymaster address
    paymaster,
    // The actual amount paid for this UserOperation
    actualGasCost,
    // The total gas used by this UserOperation
    actualGasUsed,
    // Boolean value indicating if the execution completed without revert
    success,
    // If revert occurred, this is the reason
    reason,
    // logs generated by this UserOperation only
    logs,
    // The TransactionReceipt object for the entire bundle.
    receipt
  ]
}

eth_supportedEntryPoints

Returns an array of supported EntryPoint addresses as specified in the configuration. The first element is the bundler's preferred EntryPoint.

Try it here: eth_supportedEntryPoints

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_supportedEntryPoints",
  "params": []
}

{
  "jsonrpc": "2.0",
  "id": 1,

  // EntryPoint addresses
  "result": [
    "0x...",
    "0x..."
  ]
}