ToolVet
72trust / 100

Base Nonce

by Address Nonce in Onchain & crypto

x402 APIPassing, checked 2 h ago

🆕 The next nonce for any Base address, plus its ETH balance and whether it is a contract. The count means different things either side of that line — transactions sent for a wallet, contracts deployed for a contract — so both are reported under their own name instead of one ambiguous number. What you need before building a transaction, or to tell a fresh address from a used one.

GET
https://402.com.tr/api/x402/base-nonce
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
523 ms
678 ms slowest 5%
Last check
Passed
2 h ago, next in 4 h

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://402.com.tr/api/x402/base-nonce

Each call costs $0.002 in USDC on Base, 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://402.com.tr/api/x402/base-nonce?address=0x973a31858f4d2125f48c880542da11a2796f12d6

Parameters

ParameterTypeRequiredDescription
addressstringYesAddress

Example response

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

{
  "address": "0x973A31858f4D2125f48C880542DA11a2796f12D6",
  "chain": "base",
  "checkedAt": "2026-10-08T08:48:18.025Z",
  "contractsDeployed": null,
  "delegated": true,
  "isContract": false,
  "nonce": 1357,
  "sentTransactions": 1357
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://402.com.tr/api/x402/base-nonce?address=0x973a31858f4d2125f48c880542da11a2796f12d6'

# 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://402.com.tr/api/x402/base-nonce?address=0x973a31858f4d2125f48c880542da11a2796f12d6' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2F402.com.tr%2Fapi%2Fx402%2Fbase-nonce
const res = await pay("https://402.com.tr/api/x402/base-nonce?address=0x973a31858f4d2125f48c880542da11a2796f12d6");
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://402.com.tr/api/x402/base-nonce?address=0x973a31858f4d2125f48c880542da11a2796f12d6")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
2 h agoPassed402504 ms$0.002
13 h agoPassed402594 ms$0.002
22 h agoPassed402458 ms$0.002
32 h agoPassed402576 ms$0.002
36 h agoPassed402486 ms$0.002
Show 10 older checks
41 h agoPassed402457 ms$0.002
45 h agoPassed402478 ms$0.002
2 days agoPassed402598 ms$0.002
2 days agoPassed402464 ms$0.002
2 days agoPassed402510 ms$0.002
3 days agoPassed402454 ms$0.002
3 days agoPassed402598 ms$0.002
3 days agoPassed402527 ms$0.002
3 days agoPassed402548 ms$0.002
3 days agoPassed402499 ms$0.002