ToolVet
75trust / 100

Allowance Audit

by stall-row in Onchain & crypto

x402 APIPassing, checked just now

Audit one Base wallet's ERC-20 approvals against a curated list of major spenders (Permit2, Uniswap, Aerodrome, aggregators): active approvals are listed and unlimited ones flagged high risk. Use this when an agent or its owner wants to know what a wallet has already authorized before it holds or moves funds. When the explorer cannot supply the held-token list, the token-dependent fields come back marked unknown rather than the call failing.

POST
https://stall-row-production.up.railway.app/v1/allowance-audit
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
602 ms
650 ms slowest 5%
Last check
Passed
just now, next in 28 min

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

POST https://stall-row-production.up.railway.app/v1/allowance-audit

Each call costs $0.005 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.

POST https://stall-row-production.up.railway.app/v1/allowance-audit
content-type: application/json

{
  "address": "0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F"
}

Parameters

ParameterTypeRequiredDescription
addressstringYes

Example response

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

{
  "active_approvals": [],
  "address": "0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F",
  "allowance_checks_performed": 20,
  "coverage_note": "Only the listed spenders are checked.",
  "spender_coverage": [
    "Permit2 (Uniswap)",
    "Uniswap V3 SwapRouter02"
  ],
  "spenders_checked": 10,
  "summary": "No active approvals found across 2 held token(s) and 10 known spenders.",
  "tokens_held_checked": 2,
  "unlimited_approvals": 0
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://stall-row-production.up.railway.app/v1/allowance-audit' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F"}'

# 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 - -X POST 'https://stall-row-production.up.railway.app/v1/allowance-audit' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F"}' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fstall-row-production.up.railway.app%2Fv1%2Fallowance-audit&method=POST
const res = await pay("https://stall-row-production.up.railway.app/v1/allowance-audit", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F"
  }),
});
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://stall-row-production.up.railway.app/v1/allowance-audit",
        json={
            "address": "0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F",
        },
    )
    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
just nowPassed402650 ms$0.005
5 h agoPassed402569 ms$0.005
11 h agoPassed402602 ms$0.005