eth_estimateUserOperationGas

curl --request POST \
  --url https://api.gelato.cloud/rpc/{chainId} \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <x-api-key>' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_estimateUserOperationGas",
  "params": [
    {
      "sender": "0x....",
      "nonce": "0x....",
      "factory": "0x....",
      "factoryData": "0x....",
      "callData": "0x....",
      "signature": "0x....",
      "maxFeePerGas": "0x....",
      "maxPriorityFeePerGas": "0x....",
      "paymaster": "0x....",
      "paymasterData": "0x....",
      "eip7702Auth": {
        "address": "0x....",
        "chainId": "0x....",
        "nonce": "0x....",
        "r": "0x....",
        "s": "0x....",
        "yParity": "0x...."
      }
    },
    "0x0000000071727De22E5E9d8BAf0edAc6f37da032",
    {
      "0xsender": {
        "balance": "0x....",
        "nonce": "0x....",
        "code": "0x...."
      }
    }
  ]
}
'

import requests

url = "https://api.gelato.cloud/rpc/{chainId}"

payload = {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "eth_estimateUserOperationGas",
    "params": [{
            "sender": "0x....",
            "nonce": "0x....",
            "factory": "0x....",
            "factoryData": "0x....",
            "callData": "0x....",
            "signature": "0x....",
            "maxFeePerGas": "0x....",
            "maxPriorityFeePerGas": "0x....",
            "paymaster": "0x....",
            "paymasterData": "0x....",
            "eip7702Auth": {
                "address": "0x....",
                "chainId": "0x....",
                "nonce": "0x....",
                "r": "0x....",
                "s": "0x....",
                "yParity": "0x...."
            }
        }, "0x0000000071727De22E5E9d8BAf0edAc6f37da032", { "0xsender": {
                "balance": "0x....",
                "nonce": "0x....",
                "code": "0x...."
            } }]
}
headers = {
    "X-API-Key": "<x-api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    id: 1,
    jsonrpc: '2.0',
    method: 'eth_estimateUserOperationGas',
    params: [
      {
        sender: '0x....',
        nonce: '0x....',
        factory: '0x....',
        factoryData: '0x....',
        callData: '0x....',
        signature: '0x....',
        maxFeePerGas: '0x....',
        maxPriorityFeePerGas: '0x....',
        paymaster: '0x....',
        paymasterData: '0x....',
        eip7702Auth: {
          address: '0x....',
          chainId: '0x....',
          nonce: '0x....',
          r: '0x....',
          s: '0x....',
          yParity: '0x....'
        }
      },
      '0x0000000071727De22E5E9d8BAf0edAc6f37da032',
      {'0xsender': {balance: '0x....', nonce: '0x....', code: '0x....'}}
    ]
  })
};

fetch('https://api.gelato.cloud/rpc/{chainId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.gelato.cloud/rpc/{chainId}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'id' => 1,
    'jsonrpc' => '2.0',
    'method' => 'eth_estimateUserOperationGas',
    'params' => [
        [
                'sender' => '0x....',
                'nonce' => '0x....',
                'factory' => '0x....',
                'factoryData' => '0x....',
                'callData' => '0x....',
                'signature' => '0x....',
                'maxFeePerGas' => '0x....',
                'maxPriorityFeePerGas' => '0x....',
                'paymaster' => '0x....',
                'paymasterData' => '0x....',
                'eip7702Auth' => [
                                'address' => '0x....',
                                'chainId' => '0x....',
                                'nonce' => '0x....',
                                'r' => '0x....',
                                's' => '0x....',
                                'yParity' => '0x....'
                ]
        ],
        '0x0000000071727De22E5E9d8BAf0edAc6f37da032',
        [
                '0xsender' => [
                                'balance' => '0x....',
                                'nonce' => '0x....',
                                'code' => '0x....'
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <x-api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.gelato.cloud/rpc/{chainId}"

	payload := strings.NewReader("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_estimateUserOperationGas\",\n  \"params\": [\n    {\n      \"sender\": \"0x....\",\n      \"nonce\": \"0x....\",\n      \"factory\": \"0x....\",\n      \"factoryData\": \"0x....\",\n      \"callData\": \"0x....\",\n      \"signature\": \"0x....\",\n      \"maxFeePerGas\": \"0x....\",\n      \"maxPriorityFeePerGas\": \"0x....\",\n      \"paymaster\": \"0x....\",\n      \"paymasterData\": \"0x....\",\n      \"eip7702Auth\": {\n        \"address\": \"0x....\",\n        \"chainId\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"r\": \"0x....\",\n        \"s\": \"0x....\",\n        \"yParity\": \"0x....\"\n      }\n    },\n    \"0x0000000071727De22E5E9d8BAf0edAc6f37da032\",\n    {\n      \"0xsender\": {\n        \"balance\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"code\": \"0x....\"\n      }\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<x-api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.gelato.cloud/rpc/{chainId}")
  .header("X-API-Key", "<x-api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_estimateUserOperationGas\",\n  \"params\": [\n    {\n      \"sender\": \"0x....\",\n      \"nonce\": \"0x....\",\n      \"factory\": \"0x....\",\n      \"factoryData\": \"0x....\",\n      \"callData\": \"0x....\",\n      \"signature\": \"0x....\",\n      \"maxFeePerGas\": \"0x....\",\n      \"maxPriorityFeePerGas\": \"0x....\",\n      \"paymaster\": \"0x....\",\n      \"paymasterData\": \"0x....\",\n      \"eip7702Auth\": {\n        \"address\": \"0x....\",\n        \"chainId\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"r\": \"0x....\",\n        \"s\": \"0x....\",\n        \"yParity\": \"0x....\"\n      }\n    },\n    \"0x0000000071727De22E5E9d8BAf0edAc6f37da032\",\n    {\n      \"0xsender\": {\n        \"balance\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"code\": \"0x....\"\n      }\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.gelato.cloud/rpc/{chainId}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<x-api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_estimateUserOperationGas\",\n  \"params\": [\n    {\n      \"sender\": \"0x....\",\n      \"nonce\": \"0x....\",\n      \"factory\": \"0x....\",\n      \"factoryData\": \"0x....\",\n      \"callData\": \"0x....\",\n      \"signature\": \"0x....\",\n      \"maxFeePerGas\": \"0x....\",\n      \"maxPriorityFeePerGas\": \"0x....\",\n      \"paymaster\": \"0x....\",\n      \"paymasterData\": \"0x....\",\n      \"eip7702Auth\": {\n        \"address\": \"0x....\",\n        \"chainId\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"r\": \"0x....\",\n        \"s\": \"0x....\",\n        \"yParity\": \"0x....\"\n      }\n    },\n    \"0x0000000071727De22E5E9d8BAf0edAc6f37da032\",\n    {\n      \"0xsender\": {\n        \"balance\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"code\": \"0x....\"\n      }\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

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

{
  "message": "<string>"
}

POST

rpc

{chainId}

eth_estimateUserOperationGas

curl --request POST \
  --url https://api.gelato.cloud/rpc/{chainId} \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <x-api-key>' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_estimateUserOperationGas",
  "params": [
    {
      "sender": "0x....",
      "nonce": "0x....",
      "factory": "0x....",
      "factoryData": "0x....",
      "callData": "0x....",
      "signature": "0x....",
      "maxFeePerGas": "0x....",
      "maxPriorityFeePerGas": "0x....",
      "paymaster": "0x....",
      "paymasterData": "0x....",
      "eip7702Auth": {
        "address": "0x....",
        "chainId": "0x....",
        "nonce": "0x....",
        "r": "0x....",
        "s": "0x....",
        "yParity": "0x...."
      }
    },
    "0x0000000071727De22E5E9d8BAf0edAc6f37da032",
    {
      "0xsender": {
        "balance": "0x....",
        "nonce": "0x....",
        "code": "0x...."
      }
    }
  ]
}
'

import requests

url = "https://api.gelato.cloud/rpc/{chainId}"

payload = {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "eth_estimateUserOperationGas",
    "params": [{
            "sender": "0x....",
            "nonce": "0x....",
            "factory": "0x....",
            "factoryData": "0x....",
            "callData": "0x....",
            "signature": "0x....",
            "maxFeePerGas": "0x....",
            "maxPriorityFeePerGas": "0x....",
            "paymaster": "0x....",
            "paymasterData": "0x....",
            "eip7702Auth": {
                "address": "0x....",
                "chainId": "0x....",
                "nonce": "0x....",
                "r": "0x....",
                "s": "0x....",
                "yParity": "0x...."
            }
        }, "0x0000000071727De22E5E9d8BAf0edAc6f37da032", { "0xsender": {
                "balance": "0x....",
                "nonce": "0x....",
                "code": "0x...."
            } }]
}
headers = {
    "X-API-Key": "<x-api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    id: 1,
    jsonrpc: '2.0',
    method: 'eth_estimateUserOperationGas',
    params: [
      {
        sender: '0x....',
        nonce: '0x....',
        factory: '0x....',
        factoryData: '0x....',
        callData: '0x....',
        signature: '0x....',
        maxFeePerGas: '0x....',
        maxPriorityFeePerGas: '0x....',
        paymaster: '0x....',
        paymasterData: '0x....',
        eip7702Auth: {
          address: '0x....',
          chainId: '0x....',
          nonce: '0x....',
          r: '0x....',
          s: '0x....',
          yParity: '0x....'
        }
      },
      '0x0000000071727De22E5E9d8BAf0edAc6f37da032',
      {'0xsender': {balance: '0x....', nonce: '0x....', code: '0x....'}}
    ]
  })
};

fetch('https://api.gelato.cloud/rpc/{chainId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.gelato.cloud/rpc/{chainId}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'id' => 1,
    'jsonrpc' => '2.0',
    'method' => 'eth_estimateUserOperationGas',
    'params' => [
        [
                'sender' => '0x....',
                'nonce' => '0x....',
                'factory' => '0x....',
                'factoryData' => '0x....',
                'callData' => '0x....',
                'signature' => '0x....',
                'maxFeePerGas' => '0x....',
                'maxPriorityFeePerGas' => '0x....',
                'paymaster' => '0x....',
                'paymasterData' => '0x....',
                'eip7702Auth' => [
                                'address' => '0x....',
                                'chainId' => '0x....',
                                'nonce' => '0x....',
                                'r' => '0x....',
                                's' => '0x....',
                                'yParity' => '0x....'
                ]
        ],
        '0x0000000071727De22E5E9d8BAf0edAc6f37da032',
        [
                '0xsender' => [
                                'balance' => '0x....',
                                'nonce' => '0x....',
                                'code' => '0x....'
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <x-api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.gelato.cloud/rpc/{chainId}"

	payload := strings.NewReader("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_estimateUserOperationGas\",\n  \"params\": [\n    {\n      \"sender\": \"0x....\",\n      \"nonce\": \"0x....\",\n      \"factory\": \"0x....\",\n      \"factoryData\": \"0x....\",\n      \"callData\": \"0x....\",\n      \"signature\": \"0x....\",\n      \"maxFeePerGas\": \"0x....\",\n      \"maxPriorityFeePerGas\": \"0x....\",\n      \"paymaster\": \"0x....\",\n      \"paymasterData\": \"0x....\",\n      \"eip7702Auth\": {\n        \"address\": \"0x....\",\n        \"chainId\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"r\": \"0x....\",\n        \"s\": \"0x....\",\n        \"yParity\": \"0x....\"\n      }\n    },\n    \"0x0000000071727De22E5E9d8BAf0edAc6f37da032\",\n    {\n      \"0xsender\": {\n        \"balance\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"code\": \"0x....\"\n      }\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<x-api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.gelato.cloud/rpc/{chainId}")
  .header("X-API-Key", "<x-api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_estimateUserOperationGas\",\n  \"params\": [\n    {\n      \"sender\": \"0x....\",\n      \"nonce\": \"0x....\",\n      \"factory\": \"0x....\",\n      \"factoryData\": \"0x....\",\n      \"callData\": \"0x....\",\n      \"signature\": \"0x....\",\n      \"maxFeePerGas\": \"0x....\",\n      \"maxPriorityFeePerGas\": \"0x....\",\n      \"paymaster\": \"0x....\",\n      \"paymasterData\": \"0x....\",\n      \"eip7702Auth\": {\n        \"address\": \"0x....\",\n        \"chainId\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"r\": \"0x....\",\n        \"s\": \"0x....\",\n        \"yParity\": \"0x....\"\n      }\n    },\n    \"0x0000000071727De22E5E9d8BAf0edAc6f37da032\",\n    {\n      \"0xsender\": {\n        \"balance\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"code\": \"0x....\"\n      }\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.gelato.cloud/rpc/{chainId}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<x-api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_estimateUserOperationGas\",\n  \"params\": [\n    {\n      \"sender\": \"0x....\",\n      \"nonce\": \"0x....\",\n      \"factory\": \"0x....\",\n      \"factoryData\": \"0x....\",\n      \"callData\": \"0x....\",\n      \"signature\": \"0x....\",\n      \"maxFeePerGas\": \"0x....\",\n      \"maxPriorityFeePerGas\": \"0x....\",\n      \"paymaster\": \"0x....\",\n      \"paymasterData\": \"0x....\",\n      \"eip7702Auth\": {\n        \"address\": \"0x....\",\n        \"chainId\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"r\": \"0x....\",\n        \"s\": \"0x....\",\n        \"yParity\": \"0x....\"\n      }\n    },\n    \"0x0000000071727De22E5E9d8BAf0edAc6f37da032\",\n    {\n      \"0xsender\": {\n        \"balance\": \"0x....\",\n        \"nonce\": \"0x....\",\n        \"code\": \"0x....\"\n      }\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

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

{
  "message": "<string>"
}

Update: State overrides are now supported in this API endpoint. Checkout this example and Guide to understand how to use it.

In the Playground, click Add an Item to include the StateOverrideSet object.
Then, click Add a Property and add sender address there.
Now you can add the override values such as balance, nonce, code, state, stateDiff etc.

Before using the API Endpoints, make sure to check out the How-To Guides to understand the required parameters for different payment methods with the Gelato Bundler.

The API Playground below defaults to EntryPoint v0.7 & EntryPoint v0.8 parameters, If you’re working with EntryPoint v0.6, please change the object parameter to UserOperationEntryPoint0.6.Important: After entering the userOperation parameters, make sure to click Add an Item to include the EntryPoint address.

Headers

X-API-Key

string

required

Gelato API key for higher rate limits. This must be provided if sponsoring off-chain via Gas Tank.

Path Parameters

chainId

number

required

Target network chain identifier.

Body

application/json

number

default:1

jsonrpc

string

default:2.0

method

string

default:eth_estimateUserOperationGas

params

(`UserOperationEntryPoint0.7` · object | `UserOperationEntryPoint0.6` · object | string | `StateOverrideSet` · object)[]

Object - The UserOperation object (gas limits and prices are optional)
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.
Object - Optional state override set that allows changes to the state of a contract before executing the call.

Required array length: 2 - 3 elements

Show child attributes

Response

Successful response

number

default:1

jsonrpc

string

default:2.0

result

object

Show child attributes

eth_sendUserOperationSync eth_getUserOperationByHash

⌘I