ToolVet
72trust / 100

Revoke Builder

by Revoke Calldata Builder in Onchain & crypto

x402 APIPassing, checked 10 h ago

approval-advisor tells you WHAT to revoke; this builds the HOW: the ready-to-sign transaction (to + calldata) for approve(spender, 0) on a token, plus the live current allowance read from Base (flags unlimited, or 'already revoked'). Hand the result straight to a wallet or agent signer — the action half of approval hygiene.

GET
https://402.com.tr/api/x402/revoke-builder
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
423 ms
658 ms slowest 5%
Last check
Passed
10 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://402.com.tr/api/x402/revoke-builder

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/revoke-builder?spender=0xcF77a3Ba9A5CA399B7c97c74d54e5b1Beb874E43&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&wallet=0x973a31858f4d2125f48c880542da11a2796f12d6

Parameters

ParameterTypeRequiredDescription
spenderstringYesSpender to revoke
tokenstringYesToken contract
walletstringNoYour wallet (optional, reads live allowance)

Example response

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

{
  "alreadyRevoked": true,
  "currentAllowance": "0",
  "isUnlimited": false,
  "spender": "0xcF77a3Ba9A5CA399B7c97c74d54e5b1Beb874E43",
  "symbol": "USDC",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "wallet": "0x973A31858f4D2125f48C880542DA11a2796f12D6"
}

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/revoke-builder?spender=0xcF77a3Ba9A5CA399B7c97c74d54e5b1Beb874E43&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&wallet=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/revoke-builder?spender=0xcF77a3Ba9A5CA399B7c97c74d54e5b1Beb874E43&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&wallet=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 $0.02 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%2Frevoke-builder
const res = await pay("https://402.com.tr/api/x402/revoke-builder?spender=0xcF77a3Ba9A5CA399B7c97c74d54e5b1Beb874E43&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&wallet=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 $0.02 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/revoke-builder?spender=0xcF77a3Ba9A5CA399B7c97c74d54e5b1Beb874E43&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&wallet=0x973a31858f4d2125f48c880542da11a2796f12d6")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
10 h agoPassed402397 ms$0.02
20 h agoPassed402423 ms$0.02
30 h agoPassed402519 ms$0.02
40 h agoPassed402422 ms$0.02
44 h agoPassed402500 ms$0.02
Show 10 older checks
2 days agoPassed402421 ms$0.02
2 days agoPassed402425 ms$0.02
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3 days agoPassed402560 ms$0.02
3 days agoPassed402402 ms$0.02
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