eth_createAccessList

Create Access List

POSThttps://site1.moralis-nodes.com/:chain/:apiKey

This example demonstrates generating an access list for a hypothetical transaction that interacts with a contract. The access list helps in optimizing gas costs for transactions by pre-specifying accounts and storage keys the transaction intends to access.

Note

Please refer to RPC schema page for more details on the RPC params and RPC response definitions of the RPC method.

PATH PARAMS

chainstringrequired

The blockchain to interact with. In this example, 'eth' is used to denote Ethereum Mainnet.

ethholeskypolygonpolygon amoybscbsc testnetarbitrumarbitrum sepoliaoptimismoptimism testnetbasebase sepolia

apiKeystringrequired

Your API key for authentication. Replace 'YOUR_API_KEY' with your actual Moralis API key.

BODY PARAM

jsonrpcstringrequired

Specifies the JSON-RPC protocol version, which is 2.0 for this example.

idnumberrequired

A unique identifier for the request.

methodstringrequired

The JSON-RPC method being called. For creating an access list, 'eth_createAccessList' is used.

paramsrpcArrayrequired

An array containing the transaction object for which to generate the access list, and optionally the block number.

[ { "from": "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe", "to": "0x4e6f6D7edB5CBD081670C1F898BBF721c4a24695", "gas": "0x76c0", "gasPrice": "0x9184e72a000", "value": "0x0", "data": "0x3c11dde50000000000000000000000000000000000000000000000000000000000000003" }, "latest" ]

Responses

Node.js

// Dependencies to install:
// $ npm install node-fetch --save
// add "type": "module" to package.json

import fetch from 'node-fetch';

const options = {
  method: 'POST',
  headers: {
    accept: 'application/json',
    'content-type': 'application/json'
  },
  body: JSON.stringify({
    "jsonrpc": "2.0",
    "id": 1,
    "method": "eth_createAccessList",
    "params": [
      {
        "from": "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe",
        "to": "0x4e6f6D7edB5CBD081670C1F898BBF721c4a24695",
        "gas": "0x76c0",
        "gasPrice": "0x9184e72a000",
        "value": "0x0",
        "data": "0x3c11dde50000000000000000000000000000000000000000000000000000000000000003"
      },
      "latest"
    ]
  })
};

fetch('https://site1.moralis-nodes.com/eth/YOUR_API_KEY', options)
  .then(response => response.json())
  .then(response => console.log(response))
  .catch(err => console.error(err));

Python

# Dependencies to install:

# $ python -m pip install requests

import requests

url = "https://site1.moralis-nodes.com/eth/YOUR_API_KEY"

payload = {
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_createAccessList",
  "params": [
    {
      "from": "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe",
      "to": "0x4e6f6D7edB5CBD081670C1F898BBF721c4a24695",
      "gas": "0x76c0",
      "gasPrice": "0x9184e72a000",
      "value": "0x0",
      "data": "0x3c11dde50000000000000000000000000000000000000000000000000000000000000003"
    },
    "latest"
  ]
}
headers = {
  "Accept": "application/json",
  "Content-Type": "application/json"
}

response = requests.request("POST", url, json=payload, headers=headers)

print(response.text)

cURL

curl --request POST \
     --url 'https://site1.moralis-nodes.com/eth/YOUR_API_KEY' \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_createAccessList",
  "params": [
    {
      "from": "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe",
      "to": "0x4e6f6D7edB5CBD081670C1F898BBF721c4a24695",
      "gas": "0x76c0",
      "gasPrice": "0x9184e72a000",
      "value": "0x0",
      "data": "0x3c11dde50000000000000000000000000000000000000000000000000000000000000003"
    },
    "latest"
  ]
}
'

Go

package main

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

func main() {

  url := "https://site1.moralis-nodes.com/eth/YOUR_API_KEY"

  payload := strings.NewReader("{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"eth_createAccessList\",\"params\":[{\"from\":\"0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe\",\"to\":\"0x4e6f6D7edB5CBD081670C1F898BBF721c4a24695\",\"gas\":\"0x76c0\",\"gasPrice\":\"0x9184e72a000\",\"value\":\"0x0\",\"data\":\"0x3c11dde50000000000000000000000000000000000000000000000000000000000000003\"},\"latest\"]}")

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

  req.Header.Add("Accept", "application/json")
  req.Header.Add("Content-Type", "application/json")

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

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

  fmt.Println(res)
  fmt.Println(string(body))

}

PHP

<?php
// Dependencies to install:
// $ composer require guzzlehttp/guzzle

require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://site1.moralis-nodes.com/eth/YOUR_API_KEY', [
  'body' => '{"jsonrpc":"2.0","id":1,"method":"eth_createAccessList","params":[{"from":"0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe","to":"0x4e6f6D7edB5CBD081670C1F898BBF721c4a24695","gas":"0x76c0","gasPrice":"0x9184e72a000","value":"0x0","data":"0x3c11dde50000000000000000000000000000000000000000000000000000000000000003"},"latest"]}',
  'headers' => [
    'Accept' => 'application/json',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();

Response Example

200 Successful response with the generated access list and gas used.

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "accessList": [
      ""
    ],
    "gasUsed": "0x5208"
  }
}