ToolVet
72trust / 100

B20 Authenticity

by B20 Authenticity Check in Onchain & crypto

x402 APIPassing, checked 5 h ago

🆕 Run FIRST on any 'B20'. A scammer can deploy a normal contract at a vanity 0xB200… address and fake the whole B20 read surface — the B20Factory precompile is the one authority that can't be spoofed. Verifies factory registration + bytecode absence (real B20s are chain-native precompiles with no code). verdict: genuine / fake_lookalike / not_b20. The 2-cent check that keeps every other B20 answer honest.

GET
https://402.com.tr/api/x402/b20-authenticity
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
473 ms
613 ms slowest 5%
Last check
Passed
5 h ago, next in 1 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/b20-authenticity

Each call costs $0.02 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/b20-authenticity?address=0xb20000000000000000000186a08e781c38059eec

Parameters

ParameterTypeRequiredDescription
addressstringYesToken address

Example response

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

{
  "address": "0xb20000000000000000000186a08e781c38059eeC",
  "checkedAt": "2026-10-11T17:17:18.486Z",
  "factoryConfirms": true,
  "hasBytecode": true,
  "initialized": true,
  "prefixLooksB20": true,
  "verdict": "genuine"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

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/b20-authenticity?address=0xb20000000000000000000186a08e781c38059eec'

# 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/b20-authenticity?address=0xb20000000000000000000186a08e781c38059eec' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2F402.com.tr%2Fapi%2Fx402%2Fb20-authenticity
const res = await pay("https://402.com.tr/api/x402/b20-authenticity?address=0xb20000000000000000000186a08e781c38059eec");
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
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/b20-authenticity?address=0xb20000000000000000000186a08e781c38059eec")
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
5 h agoPassed402565 ms$0.02
15 h agoPassed402537 ms$0.02
25 h agoPassed402514 ms$0.02
34 h agoPassed402500 ms$0.02
38 h agoPassed402518 ms$0.02
Show 10 older checks
43 h agoPassed402495 ms$0.02
47 h agoPassed402454 ms$0.02
2 days agoPassed402484 ms$0.02
2 days agoPassed402618 ms$0.02
2 days agoPassed402393 ms$0.02
3 days agoPassed402442 ms$0.02
3 days agoPassed402569 ms$0.02
3 days agoPassed402606 ms$0.02
3 days agoPassed402613 ms$0.02
4 days agoPassed402442 ms$0.02