ToolVet
78trust / 100

X402 Audit

by MimirAPI in Security & trust

x402 APIPassing, checked 2 h ago

Weigh any x402 counter and get a verdict: does its URL answer a coherent 402, would the CDP Bazaar validator accept its discovery metadata, and is it actually listed in the discovery index? Returns a per-check report (passed / found-wanting / unweighed) with evidence, optionally HMAC-signed. Three keyless checks for sellers and machine-service buyers.

POST
https://mimirapi.com/v1/x402-audit
Price
$0.25
per call in USDC
Uptime
100%
last 30 days
Response time
262 ms
385 ms slowest 5%
Last check
Passed
2 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

How to call it

POST https://mimirapi.com/v1/x402-audit

Each call costs $0.25 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://mimirapi.com/v1/x402-audit
content-type: application/json

{
  "url": "https://mimirapi.com/v1/ping"
}

Parameters

ParameterTypeRequiredDescription
urlstring (uri)Yeshttps URL of the x402 resource to weigh

Example response

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

Example response, 29 lines
{
  "verdict": {
    "balances": true,
    "resource": "https://mimirapi.com/v1/ping",
    "summary": {
      "passed": 3,
      "unweighed": 0,
      "wanting": 0
    },
    "ts": "2026-07-21T00:00:00.000Z",
    "weighings": [
      {
        "detail": "coherent x402 402: 0.001000 USDC on eip155:8453 → 0x40e5…",
        "name": "challenge-shape",
        "weight": "passed"
      },
      {
        "detail": "CDP validator: valid, would be indexed",
        "name": "listing-validity",
        "weight": "passed"
      },
      {
        "detail": "listed in the CDP discovery index",
        "name": "index-presence",
        "weight": "passed"
      }
    ]
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.25.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://mimirapi.com/v1/x402-audit' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://mimirapi.com/v1/ping"}'

# 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://mimirapi.com/v1/x402-audit' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://mimirapi.com/v1/ping"}' \
  | 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 $0.25 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.25" });
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 $0.25 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmimirapi.com%2Fv1%2Fx402-audit&method=POST
const res = await pay("https://mimirapi.com/v1/x402-audit", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://mimirapi.com/v1/ping"
  }),
});
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 $0.25 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.25"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://mimirapi.com/v1/x402-audit",
        json={
            "url": "https://mimirapi.com/v1/ping",
        },
    )
    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
2 h agoPassed402439 ms$0.25
6 h agoPassed402142 ms$0.25
10 h agoPassed402166 ms$0.25
14 h agoPassed402292 ms$0.25
18 h agoPassed402246 ms$0.25
Show 10 older checks
22 h agoPassed402306 ms$0.25
26 h agoPassed402262 ms$0.25
30 h agoPassed402192 ms$0.25
34 h agoPassed402197 ms$0.25
38 h agoPassed402357 ms$0.25
42 h agoPassed402284 ms$0.25
46 h agoPassed402196 ms$0.25
2 days agoPassed402277 ms$0.25
2 days agoPassed402183 ms$0.25
2 days agoPassed402240 ms$0.25