# X-Cache Response Header Checker

> X-Cache Response Header Checker is a paid API for AI agents from site.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Fetches a URL and returns whether the X-Cache response header is present, its value, and a plain-English interpretation of what that value means.

## Facts

- Endpoint: GET https://site.intel.rallylive.ca/site/header/x-cache?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x-cache-response-header-checker-27afc04d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y2qCgpSYdMpQDlc4r2YP3

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 x-cache-response-header-checker-27afc04d
```

Example prompt: Check the X-Cache header for https://example.com — tell me whether it's present, what its value is, and what that means for caching.

## When to prefer this

Choose this endpoint when you need a quick, single-header audit of X-Cache specifically — ideal for monitoring scripts, CI/CD pipelines, or security audits that need a focused answer about cache status without parsing full header dumps. Prefer this over general header inspection tools when you want an interpreted, human-readable verdict on caching behavior, not just raw header output.

## Known failure modes

- URL is unreachable or returns a network error — no header data returned
- URL redirects unexpectedly and header is read from redirect response instead of final destination
- X-Cache header is absent — endpoint returns absence flag with note on implication
- Invalid or malformed URL provided — request fails with input validation error
- Rate limiting or firewall blocks the fetch — results in timeout or error response

## How this service works

The x-cache response header of a URL: whether it is present, its value, and a one-line reading of what the value means (or the risk of its absence for security headers). One header, one answer, for audits and monitoring scripts. $0.01 per check.

## Output

Returns whether the X-Cache response header is present on the given URL, its raw value (e.g. 'HIT', 'MISS', 'HIT from cloudfront'), and a one-line human-readable explanation of what that value indicates about caching status or the implication of its absence.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x-cache-response-header-checker-27afc04d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from site.intel.rallylive.ca](https://www.zero.xyz/host/site.intel.rallylive.ca/llms.txt)