URL unshortener

Follow a short link's redirect chain (bit.ly, t.co, youtu.be, tracking links, …) without downloading any page body: returns the final URL, the final HTTP status, and every hop with its status code and Location target. Capped at 5 redirects; every hop is SSRF-re-validated, so chains that dive into private networks are blocked. Lets agents pre-flight links before fetching or citing them.

Input

Example output

{
  "url": "https://youtu.be/dQw4w9WgXcQ",
  "finalUrl": "https://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=youtu.be",
  "finalStatus": 200,
  "redirects": 1,
  "truncated": false,
  "hops": [
    {
      "url": "https://youtu.be/dQw4w9WgXcQ",
      "status": 303,
      "location": "https://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=youtu.be"
    },
    {
      "url": "https://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=youtu.be",
      "status": 200,
      "location": null
    }
  ]
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/unshorten-url \
  -H "Content-Type: application/json" \
  -d '{"url":"https://youtu.be/dQw4w9WgXcQ"}'

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/unshorten-url", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "url": "https://youtu.be/dQw4w9WgXcQ"
  }),
});

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