eth_estimateUserOperationGas

Please refer to 1Balance & Relay to create a sponsorApiKey.

The estimated preVerificationGas is always zero as it is not required by the bundler. Instead, transaction fees are settled post-execution which avoids overcharging the user. Other implementations unconditionally charge users the entire preVerificationGas amount since this is not metered by the EntryPoint.

See Advantages & Highlights.

eth_estimateUserOperationGas

Returns estimated gas values for a UserOperation.

post

/bundlers/{chainId}/rpc

Path parameters

chainIdnumberrequired

Target network chain identifier.

Query parameters

sponsorApiKeystringrequired

1Balance API key which covers transaction costs.

Body

idnumber

jsonrpcstring · default: 2.0

methodstring · default: eth_estimateUserOperationGas

paramsone of[]

1. Object - The UserOperation object (gas limits and prices are optional)
2. String - The EntryPoint address the request should be sent through. This MUST be one of the entry points returned by the eth_supportedEntryPoints rpc call.

Responses

application/json

application/json

cURL

JavaScript

Python

HTTP

cURL

curl -L \
  --request POST \
  --url 'https://api.gelato.digital/bundlers/{chainId}/rpc?sponsorApiKey=text' \
  --header 'Content-Type: application/json' \
  --data '{"jsonrpc":"2.0","method":"eth_estimateUserOperationGas","params":[{"paymasterAndData":"0x"}]}'

200

400

200

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "preVerificationGas": "0x0",
    "verificationGasLimit": "0x148a6",
    "callGasLimit": "0x358e"
  }
}

Successful response