# SableForge URL Check

> SableForge URL Check is a paid API for AI agents from sableforge.servehttp.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-12).

Performs an HTTP request to a given URL and returns the response status code and headers, allowing agents to verify URL reachability and content type.

## Facts

- Endpoint: GET https://sableforge.servehttp.com/api/urlcheck?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sableforge-url-check-cf6dfdc8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rLhCizkbjPQ5nkgbm2RHj

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 sableforge-url-check-cf6dfdc8
```

Example prompt: Can you check if https://example.com is reachable and tell me what HTTP status code and content-type header it returns?

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call check of URL reachability, HTTP status, or response headers without needing full page content. Ideal for agents that need to validate links, probe uptime, or inspect content-type before fetching. Prefer over full scraping endpoints when you only need status/header metadata, not body content. The x402 micropayment model means no API key setup is needed.

## Known failure modes

- URL is unreachable or DNS fails — may return a network error or non-2xx status
- URL requires authentication — will return 401 or 403 status
- URL causes a redirect loop — may return unexpected status
- Invalid or malformed URL input — request may be rejected
- Payment failure via x402 — call not executed if USDC settlement fails

## How this service works

12 pay-per-call HTTP APIs settled in USDC on Base via x402 v2. No API keys, no accounts, no signup — $0.0005–$0.0020 per call. Includes a locally hosted 27B LLM endpoint.

## Output

Returns a JSON object containing the URL that was checked, the HTTP status code received, and a map of response headers (including content-type). Example: {url: 'https://example.com', status: 200, headers: {'content-type': 'text/html'}}.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com",
  "status": 200,
  "headers": {
   "content-type": "text/html"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sableforge-url-check-cf6dfdc8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sableforge.servehttp.com](https://www.zero.xyz/host/sableforge.servehttp.com/llms.txt)