🔍 eth_getTransactionByHash - Base Chain

What This Method Does

The eth_getTransactionByHash method lets you look up any transaction on Base using its unique hash (transaction ID). Think of the transaction hash as a receipt number that lets you retrieve all details about a specific transaction.

Parameters

Parameter	What to Provide
`transactionHash`	The unique 66-character transaction ID (starts with "0x")

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What You'll Get Back

The method returns a transaction object with these important fields:

Field	What It Tells You
`blockHash` & `blockNumber`	Which block contains this transaction (null if still pending)
`from`	The wallet address that sent the transaction
`to`	The receiving wallet or contract address
`value`	Amount of ETH transferred (in wei, hex format)
`gas`	Maximum gas the sender was willing to use
`gasPrice`	Price per unit of gas the sender offered to pay
`maxFeePerGas` & `maxPriorityFeePerGas`	Fee limits for modern (EIP-1559) transactions
`input`	Data sent to interact with contracts (empty for simple transfers)
`nonce`	Transaction sequence number from the sender's account
`type`	Transaction type (0=legacy, 2=modern EIP-1559)
`chainId`	Network identifier (8453/0x2105 for Base mainnet)
`v`, `r`, `s`	Cryptographic signature components that prove who sent the transaction

How To Use It

POST https://base-mainnet.chainnodes.org/YOUR-API-KEY

Example Request

HTTPS POST Request with a JSON RPC call in the body
Replace YOUR-API-KEY with the API key from your Chainnodes.org Dashboard
You can use a different supported network by replacing base-mainnet

curl https://base-mainnet.chainnodes.org/YOUR-API-KEY \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params": ["0xf02e0576a830ab37f2eb1c43ed3fbcaa53d84bf5ca985ae60c71f5cac27f4cc3"],"id":1}'

Example Response

{
   "jsonrpc": "2.0",
   "id": 1,
   "result": {
      "blockHash": "0x54751c3cb4f7c95b249ab5ed702a708a6782cc937b1d399f25be4b40d9e0f5d4",
      "blockNumber": "0x57e450",
      "from": "0xad89a377e302791fb523ffb427f3f480cad3a72c",
      "gas": "0x3362",
      "gasPrice": "0xe12c5d1dc",
      "maxFeePerGas": "0xe12c5d1dc",
      "maxPriorityFeePerGas": "0x5f5e100",
      "hash": "0xf02e0576a830ab37f2eb1c43ed3fbcaa53d84bf5ca985ae60c71f5cac27f4cc3",
      "input": "0x3593564c0000000000000000000000000000000000000000000000000000000000000060",
      "nonce": "0x1",
      "to": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
      "transactionIndex": "0x0",
      "value": "0x0",
      "type": "0x2",
      "accessList": [],
      "chainId": "0x2105",
      "v": "0x0",
      "r": "0x3b4afab91edec37c0cfe9e68f2d65c4c7e9ab23d3453eaa456bdb41e5d22548f",
      "s": "0x217ad72b41a611526a45aae9392affba8114c0bd4c25e8ef7f05cda45ef5cee0"
   }
}

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Common Use Cases

✅ Check if a Transaction is Confirmed

// A simple way to check if a transaction has been processed
const tx = await getTransactionByHash(txHash);
const isConfirmed = tx.blockNumber !== null;
console.log(isConfirmed ? "Transaction confirmed!" : "Still pending...");

🧮 Calculate the Transaction Cost

// Convert hex values to regular numbers to calculate the cost
const gasLimit = parseInt(tx.gas, 16);              // Convert hex to decimal
const maxFeePerGas = parseInt(tx.maxFeePerGas, 16); // Convert hex to decimal
const maxCost = gasLimit * maxFeePerGas;            // Maximum possible cost in wei
const maxCostInETH = maxCost / 1000000000000000000; // Convert to ETH

🔍 Decode a Contract Interaction

// The first 4 bytes of input data identify the contract function being called
const methodSignature = tx.input.substring(0, 10); 
console.log(`Contract function called: ${methodSignature}`);
// Example: 0xa9059cbb = transfer function on most tokens

🌉 Track a Bridge Transaction

// Get details of a transaction that bridges assets between Ethereum and Base
{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params":["0xYourBridgeTransactionHash"],"id":1}
// Look at the "to" address and "input" data to understand the bridge interaction

Related Methods

eth_getTransactionReceipt - Get the results of a transaction (success/failure, gas used, events emitted)
eth_getTransactionByBlockNumberAndIndex - Find a transaction if you know which block it's in

Base Chain Tips

💰 Fees on Base: Transactions on Base are generally cheaper than on Ethereum mainnet, but they include a small fee that goes to Ethereum (L1 data fee) for security.

🔢 Network IDs: When you see chainId of 0x2105 (8453 in decimal), that's Base mainnet. For Base testnet, you'll see 0x14a33 (84531 in decimal).

eth_getTransactionByBlockNumberAndIndex eth_getTransactionCount