eth_sendRawTransaction - Unichain

Example code for the eth_sendRawTransaction JSON-RPC method. Complete guide to using the eth_sendRawTransaction JSON-RPC method in the GetBlock.io Web3 documentation.

This method submits a signed, serialized transaction to the Unichain network. On acceptance, it returns the transaction hash; the transaction is then propagated to validators for inclusion.

Parameters

Parameter	Type	Required	Description
signedTransaction	string	Yes	The signed transaction data, hex-encoded

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": "eth_sendRawTransaction",
    "params": ["0x02f8730182... signed raw transaction hex ...c001a0"],
    "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: 'eth_sendRawTransaction',
    params: ["0x02f8730182... signed raw transaction hex ...c001a0"],
    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': 'eth_sendRawTransaction',
        'params': ["0x02f8730182... signed raw transaction hex ...c001a0"],
        '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": "eth_sendRawTransaction",
            "params": ["0x02f8730182... signed raw transaction hex ...c001a0"],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

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

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x4a7b0c3d6e9f2a5b8c1d4e7f0a3b6c9d2e5f8a1b4c7d0e3f6a9b2c5d8e1f4a7b"
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	string	Hash of the submitted transaction

Use Cases

• Payment Broadcast: Submit a signed native ETH transfer

• Contract Calls: Broadcast a signed state-changing contract call

• dApp Backends: Relay transactions signed on the client

• Contract Deployment: Submit a signed contract-creation transaction

Error Handling

Error Code	Message	Description
-32602	Invalid params	The raw transaction is malformed or not valid hex
-32000	Execution error	The transaction was rejected: nonce too low, underpriced, or insufficient funds
3	Execution reverted	The transaction would revert on execution
-32603	Internal error	The node failed to broadcast the transaction

Web3 Integration

Ethers.js

ethers-example.js

const { ethers } = require('ethers');

const provider = new ethers.JsonRpcProvider('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/');

const tx = await provider.broadcastTransaction(signedTx);
console.log(tx.hash);

Viem

viem-example.js

import { createPublicClient, http } from 'viem';
import { unichain } from 'viem/chains';

const client = createPublicClient({ chain: unichain, transport: http('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/') });

const hash = await client.sendRawTransaction({ serializedTransaction: signedTx });
console.log(hash);