web3_sha3
curl --request POST \
--url https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/ \
--header 'Content-Type: application/json' \
--data '
{
"id": 1,
"jsonrpc": "2.0",
"method": "web3_sha3",
"params": [
"0x68656c6c6f"
]
}
'import requests
url = "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload = {
"id": 1,
"jsonrpc": "2.0",
"method": "web3_sha3",
"params": ["0x68656c6c6f"]
}
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({id: 1, jsonrpc: '2.0', method: 'web3_sha3', params: ['0x68656c6c6f']})
};
fetch('https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/', 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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/",
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([
'id' => 1,
'jsonrpc' => '2.0',
'method' => 'web3_sha3',
'params' => [
'0x68656c6c6f'
]
]),
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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload := strings.NewReader("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"web3_sha3\",\n \"params\": [\n \"0x68656c6c6f\"\n ]\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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
.header("Content-Type", "application/json")
.body("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"web3_sha3\",\n \"params\": [\n \"0x68656c6c6f\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
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 \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"web3_sha3\",\n \"params\": [\n \"0x68656c6c6f\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"jsonrpc": "2.0",
"id": 1,
"result": "0x1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8"
}Arc node API
web3_sha3 | Arc
Arc 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 --request POST \
--url https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/ \
--header 'Content-Type: application/json' \
--data '
{
"id": 1,
"jsonrpc": "2.0",
"method": "web3_sha3",
"params": [
"0x68656c6c6f"
]
}
'import requests
url = "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload = {
"id": 1,
"jsonrpc": "2.0",
"method": "web3_sha3",
"params": ["0x68656c6c6f"]
}
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({id: 1, jsonrpc: '2.0', method: 'web3_sha3', params: ['0x68656c6c6f']})
};
fetch('https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/', 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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/",
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([
'id' => 1,
'jsonrpc' => '2.0',
'method' => 'web3_sha3',
'params' => [
'0x68656c6c6f'
]
]),
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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload := strings.NewReader("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"web3_sha3\",\n \"params\": [\n \"0x68656c6c6f\"\n ]\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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
.header("Content-Type", "application/json")
.body("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"web3_sha3\",\n \"params\": [\n \"0x68656c6c6f\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
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 \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"web3_sha3\",\n \"params\": [\n \"0x68656c6c6f\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"jsonrpc": "2.0",
"id": 1,
"result": "0x1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8"
}Arc 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
Theweb3_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
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}'
Last modified on August 3, 2026
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