eth_getBlockTransactionCountByHash - Base

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

The eth_getBlockTransactionCountByHash method returns the number of transactions in a block matching the given block hash. This is useful for quickly determining block activity without fetching full block data.

Parameters

Parameter

Type

Required

Description

blockHash

string

Yes

32-byte hash of the block

Request

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockTransactionCountByHash",
    "params": ["0x849a3ac8f0d81df1a645701cdb9f90e58500d2eabb80ff3b7f4e8c13f025eff2"],
    "id": "getblock.io"
}'

example.js

const axios = require('axios');

const blockHash = '0x849a3ac8f0d81df1a645701cdb9f90e58500d2eabb80ff3b7f4e8c13f025eff2';

const response = await axios.post('https://go.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'eth_getBlockTransactionCountByHash',
    params: [blockHash],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

const txCount = parseInt(response.data.result, 16);
console.log('Transaction Count:', txCount);

example.py

import requests

block_hash = '0x849a3ac8f0d81df1a645701cdb9f90e58500d2eabb80ff3b7f4e8c13f025eff2'

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'eth_getBlockTransactionCountByHash',
        'params': [block_hash],
        'id': 'getblock.io'
    }
)

result = response.json()
tx_count = int(result['result'], 16)
print(f'Transaction Count: {tx_count}')

main.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 block_hash = "0x849a3ac8f0d81df1a645701cdb9f90e58500d2eabb80ff3b7f4e8c13f025eff2";
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "eth_getBlockTransactionCountByHash",
            "params": [block_hash],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;
    
    println!("Transaction Count: {}", response["result"]);
    Ok(())
}

The JSON-RPC response returns the transaction count as a hex string (for example, "0x8"). Convert it to a decimal integer in your client (examples above use parseInt(..., 16) or int(..., 16)).

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x8"
}

Response Parameters

Parameter

Type

Description

jsonrpc

string

JSON-RPC protocol version ("2.0")

string

Request identifier matching the request

result

string

Number of transactions in the block (hex)

Use Cases

Block Analysis: Quickly assess block activity levels
Network Monitoring: Track transaction throughput
Data Validation: Verify block data integrity
Indexing Optimization: Plan batch processing based on tx count
Statistics Collection: Gather block-level metrics

Error Handling

Error Code

Message

Description

-32602

Invalid params

Invalid block hash format

-32603

Internal error

Block not found

Web3 Integration

ethers.js

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

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

async function getTxCountByHash(blockHash) {
    const block = await provider.getBlock(blockHash);
    
    if (block) {
        console.log('Block Number:', block.number);
        console.log('Transaction Count:', block.transactions.length);
        return block.transactions.length;
    } else {
        console.log('Block not found');
        return null;
    }
}

getTxCountByHash('0x849a3ac8f0d81df1a645701cdb9f90e58500d2eabb80ff3b7f4e8c13f025eff2');

viem.js

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

const client = createPublicClient({
    chain: base,
    transport: http('https://go.getblock.io/<ACCESS-TOKEN>/')
});

async function getTxCountByHash(blockHash) {
    const count = await client.getBlockTransactionCount({
        blockHash: blockHash
    });
    
    console.log('Transaction Count:', count);
    return count;
}

getTxCountByHash('0x849a3ac8f0d81df1a645701cdb9f90e58500d2eabb80ff3b7f4e8c13f025eff2');

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