eth_sendRawTransaction

Submits a pre-signed transaction for broadcast to Unichain.

Why Unichain? Build on Uniswap's DeFi-optimized Superchain L2 with 250ms sub-blocks and 95% lower costs than Ethereum with 250ms sub-blocks (fastest L2), TEE-secured block building, native Superchain interoperability, and 65% revenue to validators.

Use Cases

The eth_sendRawTransaction method is essential for:

• Broadcasting transactions - Submit signed transactions to the network
• Wallet operations - Send native tokens and interact with contracts
• DeFi operations - Execute swaps, provide liquidity for decentralized exchanges, liquidity protocols, and MEV-protected DeFi applications
• Batch operations - Submit multiple transactions efficiently

Parameters

Parameter	Type	Required	Description
signedTransactionData	DATA	Yes	The signed transaction data (RLP encoded)

Request

{
  "jsonrpc": "2.0",
  "method": "eth_sendRawTransaction",
  "params": ["0xf86c..."],
  "id": 1
}

Returns

Type	Description
DATA	32-byte transaction hash

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x..."
}

Code Examples

cURL

curl -X POST https://api-unichain-mainnet.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_sendRawTransaction",
    "params": ["0xf86c808504a817c80082520894..."],
    "id": 1
  }'

JavaScript

import { JsonRpcProvider, Wallet, parseEther } from 'ethers';

const provider = new JsonRpcProvider('https://api-unichain-mainnet.n.dwellir.com/YOUR_API_KEY');
const wallet = new Wallet('YOUR_PRIVATE_KEY', provider);

// Send native tokens
async function sendTransaction(to, value) {
  const tx = await wallet.sendTransaction({
    to: to,
    value: parseEther(value)
  });

  console.log('Transaction hash:', tx.hash);

  // Wait for confirmation
  const receipt = await tx.wait();
  console.log('Confirmed in block:', receipt.blockNumber);

  return receipt;
}

// Send to contract
async function sendContractTransaction(contract, method, args, value = '0') {
  const tx = await contract[method](...args, {
    value: parseEther(value)
  });

  return await tx.wait();
}

Python

from web3 import Web3

w3 = Web3(Web3.HTTPProvider('https://api-unichain-mainnet.n.dwellir.com/YOUR_API_KEY'))

def send_transaction(private_key, to, value_in_ether):
    account = w3.eth.account.from_key(private_key)

    # Build transaction
    tx = {
        'nonce': w3.eth.get_transaction_count(account.address),
        'to': to,
        'value': w3.to_wei(value_in_ether, 'ether'),
        'gas': 21000,
        'gasPrice': w3.eth.gas_price,
        'chainId': w3.eth.chain_id
    }

    # Sign transaction
    signed_tx = account.sign_transaction(tx)

    # Send transaction
    tx_hash = w3.eth.send_raw_transaction(signed_tx.rawTransaction)
    print(f'Transaction hash: {tx_hash.hex()}')

    # Wait for confirmation
    receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
    print(f'Confirmed in block: {receipt["blockNumber"]}')

    return receipt

Go

package main

import (
    "context"
    "crypto/ecdsa"
    "fmt"
    "log"
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/ethclient"
)

func main() {
    client, err := ethclient.Dial("https://api-unichain-mainnet.n.dwellir.com/YOUR_API_KEY")
    if err != nil {
        log.Fatal(err)
    }

    privateKey, err := crypto.HexToECDSA("YOUR_PRIVATE_KEY")
    if err != nil {
        log.Fatal(err)
    }

    publicKey := privateKey.Public()
    publicKeyECDSA, _ := publicKey.(*ecdsa.PublicKey)
    fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)

    nonce, _ := client.PendingNonceAt(context.Background(), fromAddress)
    value := big.NewInt(1000000000000000000)
    gasLimit := uint64(21000)
    gasPrice, _ := client.SuggestGasPrice(context.Background())

    toAddress := common.HexToAddress("0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb")
    tx := types.NewTransaction(nonce, toAddress, value, gasLimit, gasPrice, nil)

    chainID, _ := client.NetworkID(context.Background())
    signedTx, _ := types.SignTx(tx, types.NewEIP155Signer(chainID), privateKey)

    err = client.SendTransaction(context.Background(), signedTx)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Transaction hash: %s\n", signedTx.Hash().Hex())
}

Error Handling

Error Code	Message	Description
-32000	Nonce too low	Transaction nonce already used
-32000	Insufficient funds	Account has insufficient balance
-32000	Gas too low	Gas limit insufficient
-32000	Replacement underpriced	Gas price too low for replacement

Related Methods

• eth_estimateGas - Estimate gas required
• eth_gasPrice - Get current gas price
• eth_getTransactionReceipt - Get transaction result