# URL Status and Redirect Chain Checker

> URL Status and Redirect Chain Checker is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Checks a URL's HTTP status code, full redirect chain with per-hop codes, final URL, HTTPS enforcement, content type/size, and security headers — without downloading the page body.

## Facts

- Endpoint: POST https://flat-rate-llm.kikoribera03.workers.dev/v1/web/status
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/url-status-and-redirect-chain-checker-caf5c836
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J48672zyFLGUdwMV-PqQr

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability url-status-and-redirect-chain-checker-caf5c836 -d '<json body>'
```

Example prompt: Can you check where https://bit.ly/3xampleLink actually redirects to, what the final HTTP status code is, whether it ends on HTTPS, and what security headers the server sends?

## When to prefer this

Use this endpoint when you need lightweight link health checks — HTTP status, redirect hops, and security headers — without downloading the full page body. It is ideal for auditing lists of URLs one at a time, verifying redirect destinations, checking HTTPS enforcement, or inspecting server security posture. Prefer it over a full web scraper when page content is irrelevant and speed matters. No API key or account is needed; a flat $0.005 per call makes it practical for batch link auditing jobs.

## Known failure modes

- Private or loopback IP addresses are refused with an error
- Some servers reject HEAD requests; retry with method=GET
- Unreachable or DNS-failing URLs return an error with ok=false
- Very long redirect chains may time out
- Non-HTTP/HTTPS schemes (ftp, mailto, etc.) are not supported

## How this service works

60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.

## Output

Returns a JSON object with: ok (boolean success), url (original URL), hops (number of redirects), chain (array of hop objects each with URL and status code), status (final HTTP status), finalUrl (landing URL after all redirects), elapsedMs (request duration), redirected (boolean), contentType (MIME type at final URL), and finalScheme (http or https).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "The URL to check. http and https only; private and loopback addresses are refused."
  },
  "method": {
   "type": "string",
   "description": "HEAD (default) or GET. Some servers refuse HEAD and only answer GET."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "ok": {
   "type": "boolean"
  },
  "url": {
   "type": "string"
  },
  "hops": {
   "type": "number"
  },
  "chain": {
   "type": "array",
   "items": {
    "type": "object"
   }
  },
  "status": {
   "type": "number"
  },
  "finalUrl": {
   "type": "string"
  },
  "elapsedMs": {
   "type": "number"
  },
  "redirected": {
   "type": "boolean"
  },
  "contentType": {
   "type": "string"
  },
  "finalScheme": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/url-status-and-redirect-chain-checker-caf5c836/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from flat-rate-llm.kikoribera03.workers.dev](https://www.zero.xyz/host/flat-rate-llm.kikoribera03.workers.dev/llms.txt)