web3_sha3 | Tempo

Tempo API method that returns the Keccak-256 hash of the given data. This is the same hashing algorithm used by Ethereum for various purposes.

POST /

web3_sha3

cURL

curl --request POST \
  --url https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "web3_sha3",
  "params": [
    "0x68656c6c6f"
  ],
  "id": 1
}
'

import requests

url = "https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/"

payload = {
    "jsonrpc": "2.0",
    "method": "web3_sha3",
    "params": ["0x68656c6c6f"],
    "id": 1
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({jsonrpc: '2.0', method: 'web3_sha3', params: ['0x68656c6c6f'], id: 1})
};

fetch('https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'jsonrpc' => '2.0',
    'method' => 'web3_sha3',
    'params' => [
        '0x68656c6c6f'
    ],
    'id' => 1
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/"

	payload := strings.NewReader("{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"web3_sha3\",\n  \"params\": [\n    \"0x68656c6c6f\"\n  ],\n  \"id\": 1\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/")
  .header("Content-Type", "application/json")
  .body("{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"web3_sha3\",\n  \"params\": [\n    \"0x68656c6c6f\"\n  ],\n  \"id\": 1\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"web3_sha3\",\n  \"params\": [\n    \"0x68656c6c6f\"\n  ],\n  \"id\": 1\n}"

response = http.request(request)
puts response.read_body

200

{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}

Tempo API method that returns the Keccak-256 hash of the given data. This is the same hashing algorithm used by Ethereum for various purposes.

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Parameters

• data — the data to hash (hex encoded)

Response

• result — the Keccak-256 hash of the input data

Use case

The web3_sha3 method is useful for:

• Computing function selectors (first 4 bytes of keccak256 of function signature)
• Computing event topics
• General-purpose hashing

web3_sha3 code examples

ethers.js

const ethers = require('ethers');
const NODE_URL = "CHAINSTACK_NODE_URL";
const provider = new ethers.JsonRpcProvider(NODE_URL);

const sha3Example = async () => {
    // Hash hex-encoded data via RPC
    const hash = await provider.send("web3_sha3", ["0x68656c6c6f"]); // "hello" in hex
    console.log(`Hash of 'hello': ${hash}`);

    // Compare with ethers.js local computation
    const localHash = ethers.keccak256("0x68656c6c6f");
    console.log(`Local hash: ${localHash}`);
    console.log(`Hashes match: ${hash === localHash}`);

    // Compute a function selector
    const transferSelector = await provider.send("web3_sha3", [
      ethers.toUtf8Bytes("transfer(address,uint256)").reduce(
        (hex, byte) => hex + byte.toString(16).padStart(2, '0'),
        '0x'
      )
    ]);
    console.log(`\nTransfer function selector: ${transferSelector.slice(0, 10)}`);
  };

sha3Example();

from web3 import Web3

node_url = "CHAINSTACK_NODE_URL"
web3 = Web3(Web3.HTTPProvider(node_url))

# Hash hex-encoded data
data = "0x68656c6c6f"  # "hello" in hex
result = web3.provider.make_request("web3_sha3", [data])
print(f"Hash of 'hello': {result['result']}")

# Compare with local computation
local_hash = web3.keccak(hexstr=data).hex()
print(f"Local hash: {local_hash}")

# Compute a function selector
transfer_sig = "transfer(address,uint256)"
selector = web3.keccak(text=transfer_sig).hex()[:10]
print(f"\nTransfer function selector: {selector}")

# Hash "hello" (0x68656c6c6f in hex)
curl -X POST "CHAINSTACK_NODE_URL" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "web3_sha3", "params": ["0x68656c6c6f"], "id": 1}'

Body

application/json

jsonrpc · string · default: 2.0

method · string · default: web3_sha3

params · any[]

Data to hash (hex encoded)

id · integer · default: 1

Response

200 - application/json

Keccak-256 hash

jsonrpc · string

id · integer

result · string

The Keccak-256 hash of the given data