ToolVet
78trust / 100

Web Resource Preflight

by Agent Miner Tools in Search & web

x402 APIPassing, checked 1 h ago

Use before spending tokens, money or crawler capacity fetching an unfamiliar web resource. Resolves redirects (manually, bounded, re-validated per hop) and returns deterministic HTTP/resource facts — final URL, status, content type and length, response time, a bounded HTML title/canonical peek, and a lightweight generic-bot robots.txt indication — so an agent can decide whether a normal web fetch is worthwhile. It does not scrape, render JavaScript, or judge safety.

POST https://agent-api-production.tim1712.workers.dev/v1/web/resource-preflight

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
483 ms typical, 623 ms slowest 5%
Last check
1 h ago
Next check
any minute now

How to call it

POST https://agent-api-production.tim1712.workers.dev/v1/web/resource-preflight

Each call costs $0.003 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://agent-api-production.tim1712.workers.dev/v1/web/resource-preflight
content-type: application/json

{
  "url": "https://example.com/article"
}

Parameters

ParameterTypeRequiredDescription
urlstringYes

Example response

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

Example response, 26 lines
{
  "canonicalUrl": "https://www.example.com/article",
  "checkedAt": "2026-08-30T10:00:02.000Z",
  "contentLength": 123456,
  "contentType": "text/html; charset=utf-8",
  "finalUrl": "https://www.example.com/article",
  "likelyHtml": true,
  "ok": true,
  "redirects": [
    {
      "from": "https://example.com/article",
      "status": 301,
      "to": "https://www.example.com/article"
    }
  ],
  "requestedUrl": "https://example.com/article",
  "responseTimeMs": 184,
  "robots": {
    "allowedForGenericBot": true,
    "found": true,
    "url": "https://www.example.com/robots.txt"
  },
  "status": 200,
  "title": "Example article title",
  "warnings": []
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent-api-production.tim1712.workers.dev/v1/web/resource-preflight' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://example.com/article"}'

# 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://agent-api-production.tim1712.workers.dev/v1/web/resource-preflight' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://example.com/article"}' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent-api-production.tim1712.workers.dev%2Fv1%2Fweb%2Fresource-preflight&method=POST
const res = await pay("https://agent-api-production.tim1712.workers.dev/v1/web/resource-preflight", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://example.com/article"
  }),
});
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agent-api-production.tim1712.workers.dev/v1/web/resource-preflight",
        json={
            "url": "https://example.com/article",
        },
    )
    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
1 h agoPassed402546 ms$0.003
6 h agoPassed402532 ms$0.003
10 h agoPassed402396 ms$0.003
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