# Feed Discovery via URL

> Feed Discovery via URL is a paid API for AI agents from cr4vvol.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Discovers and extracts RSS/Atom/podcast feed URLs from a given web page URL

## Facts

- Endpoint: POST https://cr4vvol.vercel.app/api/feed
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/feed-discovery-via-url-4950382e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4EqQx1f2KgJ_yD8DpLuWc

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-discovery-via-url-4950382e -d '<json body>'
```

Example prompt: Find all the RSS and podcast feeds available on https://www.theverge.com — I want to know what feeds they offer so I can subscribe.

## When to prefer this

Use this endpoint when you need to programmatically discover RSS, Atom, or podcast feed URLs from any given webpage without setting up authentication or subscriptions — ideal for agents needing pay-per-use web feed discovery billed in USDC via x402.

## Known failure modes

- URL is unreachable or returns non-200 status — success:false with error detail
- URL has no detectable feeds — success:true but data contains empty feed list
- Malformed or missing URL input — 400 validation error
- Payment not completed or insufficient USDC — 402 Payment Required
- Target site blocks scraping — may return empty or partial results

## How this service works

Web scraping and search for AI agents. No auth, no subscriptions. Pay per request in USDC via x402.

## Output

Returns a JSON object with a success boolean and a data object containing discovered feed URLs and associated metadata found at the given web page.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "URL to find feeds on"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object"
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/feed-discovery-via-url-4950382e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cr4vvol.vercel.app](https://www.zero.xyz/host/cr4vvol.vercel.app/llms.txt)