eth_getTransactionByHash - Flow EVM RPC Method

Returns the information about a transaction by transaction hash on Flow EVM Gateway.

Why Flow EVM? Build on the EVM-equivalent layer on Flow blockchain enabling Cadence+Solidity composability with full EVM equivalence on Flow, atomic multi-operation transactions, 40% lower gas fees, and 473% contract growth in 2025.

When to Use This Method

eth_getTransactionByHash is essential for NFT developers, gaming studios, and Solidity devs seeking Cadence interoperability:

• Track pending and confirmed transaction status: Monitor the full lifecycle of a transaction from submission through finalization on Flow EVM Gateway
• Verify transaction parameters: Confirm the value, gas, and input data match your intent for consumer NFTs (NBA Top Shot, Disney Pinnacle), gaming dApps, and hybrid Cadence-EVM applications
• Wallet transaction history display: Show detailed transaction records with sender, receiver, value, and status for end users
• Debug failed transactions: Inspect raw transaction data to diagnose reverted calls and unexpected behavior on the EVM-equivalent layer on Flow blockchain enabling Cadence+Solidity composability

Common Use Cases

1. Wait for Transaction Confirmation with Polling

Poll eth_getTransactionByHash until the transaction's blockNumber becomes non-null, indicating it has been mined on Flow EVM Gateway. This is the standard pattern for tracking transaction finality.

import { JsonRpcProvider } from 'ethers';

const provider = new JsonRpcProvider('https://api-flow-evm-gateway-mainnet.n.dwellir.com/YOUR_API_KEY');

async function waitForConfirmation(txHash, interval = 2000) {
  while (true) {
    const tx = await provider.getTransaction(txHash);

    if (tx && tx.blockNumber) {
      console.log(`Transaction confirmed in block #${tx.blockNumber}`);
      return tx;
    }

    console.log('Transaction pending, waiting...');
    await new Promise(r => setTimeout(r, interval));
  }
}

waitForConfirmation('0xac905cb8672fe39508dab7199529d77b32d459242ad9d3f6799e4e427d6003f8');

2. Display Transaction Details in a Wallet UI

Fetch and format transaction data for display in a wallet or explorer on Flow EVM Gateway. Extract the key fields: sender, recipient, value, gas, and confirmation status.

from web3 import Web3

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

def get_transaction_details(tx_hash):
    tx = w3.eth.get_transaction(tx_hash)

    if not tx:
        return {'status': 'not found'}

    return {
        'hash': tx['hash'].hex(),
        'from': tx['from'],
        'to': tx['to'],
        'value_ether': w3.from_wei(tx['value'], 'ether'),
        'gas': tx['gas'],
        'gas_price_gwei': w3.from_wei(tx['gasPrice'], 'gwei'),
        'block': tx.get('blockNumber'),
        'confirmed': tx.get('blockNumber') is not None,
    }

details = get_transaction_details('0xac905cb8672fe39508dab7199529d77b32d459242ad9d3f6799e4e427d6003f8')
for key, value in details.items():
    print(f'{key}: {value}')

3. Decode Transaction Input Data for Contract Interaction Analysis

When a transaction's input field contains encoded function calls, decode it using a contract ABI to understand what action was performed on the EVM-equivalent layer on Flow blockchain enabling Cadence+Solidity composability.

package main

import (
    "context"
    "fmt"
    "log"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/ethclient"
)

func main() {
    client, _ := ethclient.Dial("https://api-flow-evm-gateway-mainnet.n.dwellir.com/YOUR_API_KEY")

    txHash := common.HexToHash("0xac905cb8672fe39508dab7199529d77b32d459242ad9d3f6799e4e427d6003f8")
    tx, isPending, _ := client.TransactionByHash(context.Background(), txHash)

    fmt.Printf("Pending: %v\n", isPending)
    fmt.Printf("From: %s\n", tx.From().Hex())
    fmt.Printf("Value: %s wei\n", tx.Value().String())
    fmt.Printf("Gas limit: %d\n", tx.Gas())

    if len(tx.Data()) > 0 {
        // First 4 bytes are the function selector
        selector := tx.Data()[:4]
        fmt.Printf("Function selector: 0x%x\n", selector)
        fmt.Printf("Input data length: %d bytes\n", len(tx.Data()))
    }
}

Best Practices

• Check if blockNumber is null to detect pending transactions: A null blockNumber indicates the transaction has been submitted but not yet mined; use this to drive polling or loading states in your UI
• For mined transactions, cross-reference with receipt for confirmation count: Once a block number is available, use eth_getTransactionReceipt to get the final status, gas used, and emitted logs
• Cache confirmed transaction data indefinitely: Transaction data is immutable once mined; cache it permanently to avoid redundant RPC calls for historical lookups
• Use eth_getTransactionReceipt for post-confirmation data: After a transaction is confirmed, call eth_getTransactionReceipt to get gas used, logs, status code, and effective gas price

Code Examples

Error Handling

Related Methods

• eth_getTransactionReceipt - Get transaction receipt
• eth_sendRawTransaction - Send transaction