ToolVet
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Agents Preflight

by Tanod agentscan in Other

x402 APIPassing, checked 16 min ago

agentscan (Tanod) x402 endpoint preflight: a pay, caution or avoid verdict from the live 402 and the agent index (payTo change, price outlier, listing age, farm score). Use when an agent must decide whether to pay an x402 endpoint: live 402, payTo change, price outlier, listing age.

POST https://tanod.dev/v1/agents/preflight

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Status and outage history · Atom feed

Uptime
100%
Response time
353 ms typical, 995 ms slowest 5%
Last check
16 min ago
Next check
in 13 min

How to call it

POST https://tanod.dev/v1/agents/preflight

Each call costs $0.001 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://tanod.dev/v1/agents/preflight
content-type: application/json

{
  "url": "https://api.example.com/v1/weather"
}

Parameters

ParameterTypeRequiredDescription
policyobject or nullNoOptional spend policy. The answer then adds `policy` (result pass or fail, with failed, unknown and checked clauses), judged on the options already read. A bad policy is a 422, not charged. Default: null.
urlstringYesThe public https URL of the x402 endpoint an agent is about to pay, such as https://api.example.com/v1/weather. Host name only (no IP address), port 443, no user info. It is requested once without payment (GET, or POST when GET answers 404 or 405). A URL that is not public https, or a host that res…

Example response

The listing has no example response.

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://tanod.dev/v1/agents/preflight' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://api.example.com/v1/weather"}'

# 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://tanod.dev/v1/agents/preflight' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://api.example.com/v1/weather"}' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ftanod.dev%2Fv1%2Fagents%2Fpreflight&method=POST
const res = await pay("https://tanod.dev/v1/agents/preflight", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://api.example.com/v1/weather"
  }),
});
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://tanod.dev/v1/agents/preflight",
        json={
            "url": "https://api.example.com/v1/weather",
        },
    )
    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
16 min agoPassed4021.0 s$0.001
4 h agoPassed402995 ms$0.001
8 h agoPassed402353 ms$0.001
18 h agoPassed402269 ms$0.001