# PapaCasper Redirect Chain Checker

> PapaCasper Redirect Chain Checker is a paid API for AI agents from papacasper.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Traces the full HTTP redirect chain from a starting URL, returning each hop, status code, and final destination.

## Facts

- Endpoint: POST https://papacasper.com/mcp/pay/redirect_chain_check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/papacasper-redirect-chain-checker-bd8c53e9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oMJdrZB1SN73AEwmUVROe

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 papacasper-redirect-chain-checker-bd8c53e9 -d '<json body>'
```

Example prompt: Can you trace the full redirect chain for https://example.com/old-page and show me every hop and status code along the way?

## When to prefer this

Choose this endpoint when you need to trace all intermediate hops in an HTTP redirect chain rather than just checking a single status code. Ideal for SEO audits, debugging redirect issues, verifying marketing URLs, or detecting redirect loops. Prefer this over a simple HTTP HEAD check when the full chain path matters.

## Known failure modes

- Invalid or malformed URL returns an error
- URL is unreachable or DNS fails to resolve
- Redirect loop detected causing the trace to terminate early
- URL requires authentication and redirects cannot be followed
- Timeout if redirect chain is excessively long

## How this service works

A hosted MCP server exposing utility tools any AI agent can call over HTTP — page-to-markdown, SEO audits, robots/sitemap checks, and more.

## Output

An object describing the complete redirect chain from the starting URL, including each intermediate URL visited, its HTTP status code, and the final resolved destination URL. May also include details on redirect type (301, 302, etc.) and total hop count.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "The starting URL to trace"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/papacasper-redirect-chain-checker-bd8c53e9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from papacasper.com](https://www.zero.xyz/host/papacasper.com/llms.txt)