ToolVet
78trust / 100

Verified Random

by 3HZ Verified Random Integer in Onchain & crypto

x402 APIPassing, checked 1 h ago

Cryptographically verifiable random integer generated from the public drand Quicknet randomness beacon. Choose inclusive min and max values. The response includes the drand round, randomness and signature so the result can be independently checked.

GET
https://wallet-services-poc-clean.3hz-services.workers.dev/verified-random
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
244 ms
368 ms slowest 5%
Last check
Passed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://wallet-services-poc-clean.3hz-services.workers.dev/verified-random

Each call costs $0.001 in USDC on Base Sepolia, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://wallet-services-poc-clean.3hz-services.workers.dev/verified-random?max=100&min=1

Parameters

ParameterTypeRequiredDescription
maxintegerNoInclusive maximum integer Default: 100.
minintegerNoInclusive minimum integer Default: 1.

Example response

The provider's example. We can't check it without paying.

{
  "algorithm": "value = min + (randomness mod (max-min+1))",
  "chain_hash": "52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971",
  "fetched_at": "2026-09-17T09:00:00.000Z",
  "max": 100,
  "min": 1,
  "randomness": "b5b9f9cd19fdebe3d36edd5f18d8de507f3d66809e8bb40aa7cd3cba0d086dcd",
  "round": 32275886,
  "signature": "865671cf8df1a34d9e2fbc98f5dafb1cfda0d3fd0c2053a8eca1ab99a1f99361b3b9ee290c6038f7ddb4996504accf6b",
  "source": "drand Quicknet",
  "value": 78
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://wallet-services-poc-clean.3hz-services.workers.dev/verified-random?max=100&min=1'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://wallet-services-poc-clean.3hz-services.workers.dev/verified-random?max=100&min=1' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwallet-services-poc-clean.3hz-services.workers.dev%2Fverified-random
const res = await pay("https://wallet-services-poc-clean.3hz-services.workers.dev/verified-random?max=100&min=1");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://wallet-services-poc-clean.3hz-services.workers.dev/verified-random?max=100&min=1")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
1 h agoPassed402363 ms$0.001
6 h agoPassed402238 ms$0.001
11 h agoPassed402354 ms$0.001
15 h agoPassed402332 ms$0.001
20 h agoPassed402185 ms$0.001
Show 10 older checks
24 h agoPassed402449 ms$0.001
28 h agoPassed402340 ms$0.001
32 h agoPassed402348 ms$0.001
37 h agoPassed402292 ms$0.001
41 h agoPassed402236 ms$0.001
45 h agoPassed402238 ms$0.001
2 days agoPassed402265 ms$0.001
2 days agoPassed402336 ms$0.001
2 days agoPassed402238 ms$0.001
3 days agoPassed402240 ms$0.001