starknet_call - STRK

Example code for the starknet_call JSON-RPC method. Complete guide on how to use starknet_call JSON-RPC in GetBlock Web3 documentation.

This method executes a read-only function on a contract at a given block and returns its result as an array of felts. No transaction is created and no fee is charged.

Parameters

Parameter	Type	Required	Description
request	object	Yes	Call details: contract_address, entry_point_selector, calldata
block_id	object | string	Yes	{block_number} or {block_hash}, or a tag

Request

cURL

curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "starknet_call",
    "params": [{ "contract_address": "0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7", "entry_point_selector": "0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e", "calldata": ["0x07c57808b9cea7130c44aab2f8ca6147b04408943b48c6d8c3c83eb8cfdd8c0b"] }, "latest"],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'starknet_call',
    params: [{ contract_address: '0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7', entry_point_selector: '0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e', calldata: ['0x07c57808b9cea7130c44aab2f8ca6147b04408943b48c6d8c3c83eb8cfdd8c0b'] }, 'latest'],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'starknet_call',
        'params': [{ 'contract_address': '0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7', 'entry_point_selector': '0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e', 'calldata': ['0x07c57808b9cea7130c44aab2f8ca6147b04408943b48c6d8c3c83eb8cfdd8c0b'] }, 'latest'],
        'id': 'getblock.io'
    }
)

print(response.json())

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "starknet_call",
            "params": [{ "contract_address": "0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7", "entry_point_selector": "0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e", "calldata": ["0x07c57808b9cea7130c44aab2f8ca6147b04408943b48c6d8c3c83eb8cfdd8c0b"] }, "latest"],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": [
        "0x2386f26fc10000",
        "0x0"
    ]
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	array	Return values of the called function as felts

Use Cases

• Token Balances: Call balanceOf on ERC-20 style contracts

• Contract Reads: Invoke any view function without a transaction

• Price Feeds: Read on-chain view data for dashboards

• dApp Backends: Fetch contract state via typed calls

Error Handling

Error	Message	Description
40 / CONTRACT_ERROR	Contract error	The call reverted or the selector does not exist
20 / CONTRACT_NOT_FOUND	Contract not found	No contract exists at the address at that block