# feed-validate

> feed-validate is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Fetches and validates an RSS or Atom feed, checking format, well-formedness, required elements, item counts, and content type, returning a pass/fail result with detailed errors and warnings.

## Facts

- Endpoint: GET https://intel.rallylive.ca/dev/feed-validate
- 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/feed-validate-87884d2d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hc-oBxgobSClIrnlIWUVv

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 feed-validate-87884d2d
```

Example prompt: Can you validate my RSS feed at https://myblog.com/feed.xml and tell me if it's well-formed, what format and version it is, and list any errors or warnings like missing dates, duplicate GUIDs, or relative links?

## When to prefer this

Use this endpoint when you need a quick, automated, per-feed validation check covering format detection, required element presence, GUID uniqueness, date validity, and content-type correctness — especially before publishing a feed, integrating a third-party feed, or monitoring feed health. It is purpose-built for RSS/Atom syndication feeds and covers common aggregator-compatibility issues in a single call at low cost ($0.01 per call).

## Known failure modes

- Feed URL is unreachable or returns non-200 HTTP status
- URL does not point to an RSS/Atom feed (e.g. returns HTML)
- Feed is so malformed it cannot be parsed at all
- Network timeout fetching the feed
- Private or authentication-gated feed URL returns 401/403

## How this service works

RSS/Atom feed validator: fetches the feed, detects the format and version (RSS 2.0, Atom 1.0, RSS 1.0/RDF), checks well-formedness and required elements (title, link, id/guid, dates), counts items, flags missing/invalid dates, duplicate guids, relative links, missing descriptions, and the content type served. Returns valid true/false with errors and warnings. $0.01 per feed.

## Output

Returns a JSON object with a boolean 'valid' field, a detected feed format and version (e.g. RSS 2.0, Atom 1.0, RSS 1.0/RDF), item count, and arrays of errors and warnings covering issues such as missing required elements (title, link, id/guid, dates), duplicate GUIDs, relative links, missing descriptions, and the HTTP content type served.

## 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/feed-validate-87884d2d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)