# HTTP Redirect Chain Analyzer — Status, Origin & Downgrade Evidence

> HTTP Redirect Chain Analyzer — Status, Origin & Downgrade Evidence is a paid API for AI agents from api.the402.ai, paid per call via x402, $0.021/call, status unknown (last checked 2026-09-15).

Purchases an analysis of a public HTTP redirect chain, returning job status and thread ID for retrieving redirect path details, origin server info, and protocol downgrade evidence.

## Facts

- Endpoint: POST https://api.the402.ai/v1/services/svc_eec401d863b44d6f/purchase
- Price: $0.021/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/http-redirect-chain-analyzer-status-origin-downgrade-evidence-ff133874
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nmjL2Zrfd6CPaVMfnxjQR

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 http-redirect-chain-analyzer-status-origin-downgrade-evidence-ff133874 -d '<json body>'
```

Example prompt: Can you trace the full redirect chain for https://example.com and check whether there are any HTTP-to-HTTPS downgrades or suspicious origin hops along the way?

## When to prefer this

Use this endpoint when you need to programmatically audit the full HTTP redirect chain for a public URL — especially when investigating protocol downgrades (HTTPS to HTTP), identifying the true origin server behind redirects, or gathering evidence of security misconfigurations in redirect paths. Prefer this over manual browser inspection when you need structured, machine-readable redirect chain data.

## Known failure modes

- Payment failure or insufficient USDC balance returns an authorization error
- Invalid or unreachable URL causes job to fail with error status
- Rate limiting if too many requests are submitted in quick succession
- Job may remain in pending status if the target URL is extremely slow to respond
- Service ID mismatch returns 404 or invalid service error

## How this service works

Purchase: Public HTTP Redirect Chain — Status, Origin & Downgrade Evidence

## Output

Returns a job_id, initial status string, and thread_id that the agent can use to poll for the completed redirect chain analysis — including each redirect hop's status code, origin server, and any protocol downgrade evidence detected.

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "job_id": {
   "type": "string"
  },
  "status": {
   "type": "string"
  },
  "thread_id": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/http-redirect-chain-analyzer-status-origin-downgrade-evidence-ff133874/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.the402.ai](https://www.zero.xyz/host/api.the402.ai/llms.txt)