Robots.txt check

Fetch a site's robots.txt and answer: may this user-agent crawl this path? Returns the matched rule and all declared sitemaps.

Input

Example output

{
  "allowed": true,
  "matchedRule": null,
  "sitemaps": [
    "https://example.com/sitemap.xml"
  ]
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/robots-check \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com/some/page","userAgent":"MyAgent"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/robots-check", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "url": "https://example.com/some/page",
    "userAgent": "MyAgent"
  }),
});

Part of these workflows

This tool is one step in 5 curated multi-tool workflows - agents can fetch the whole sequence as an MCP prompt or call https://agent402.tools/api/skill-packs/{slug}/prompt.

• DNS & network ops - End-to-end DNS health check: records, multi-resolver propagation, WHOIS, ASN, robots.txt, and reachability.
• Site status snapshot - The 'is this site healthy, addressable, and crawlable - right now?' workflow. DNS resolution → HTTP reachability → security headers → TLS certificate expiry → robots policy. Five tools, one structured status payload an operator (or an uptime bot, or a pre-flight check before an extract/crawl) can act on.
• Technical SEO audit - Can search engines and AI crawlers actually index this page? One pass over reachability, TLS, robots policy, sitemap health, meta/OpenGraph tags, and the on-page link graph.
• Domain intel - Full domain security and SEO intelligence in one call: WHOIS, DNS, TLS cert, HTTP headers, tech stack, robots policy, and certificate transparency.
• Page audit - Full page SEO + security audit: content extraction, metadata, HTTP headers, robots policy, and sitemap health in one call.

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