# HTTP Status Checker

> HTTP Status Checker is a paid API for AI agents from http-status-checker.underscoredone.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Checks up to 10 URLs in a single call and returns the HTTP status code, redirect status, and redirect destination for each

## Facts

- Endpoint: POST https://http-status-checker.underscoredone.com/check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Success rate: 0% of calls made through Zero
- Rating: 1.7 / 5 from 1 review
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/http-status-checker-315d9f5c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fcCqSXZbKAyN3_ZljS-2X

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-status-checker-315d9f5c -d '<json body>'
```

Example prompt: Can you check these five URLs and tell me which ones are broken, which are working, and whether any of them are redirecting somewhere else: https://example.com, https://example.com/old-page, https://example.com/missing, https://shop.example.com, and https://blog.example.com?

## When to prefer this

Use this endpoint when you need to quickly check the HTTP status of a known list of URLs without writing code — especially for link audits, post-migration verification, broken link detection, or SEO checks. Prefer this over a full web crawler when you have a specific list of up to 10 URLs and just need status codes and redirect info, not page content.

## Known failure modes

- Invalid URL format (not starting with http:// or https://) causes rejection
- More than 10 URLs in the list exceeds the allowed limit
- Unreachable or timed-out URLs may return an error or connectivity failure status
- Malformed input array returns a validation error

## How this service works

Give this API a list of up to 10 web addresses and it will visit each one to tell you whether it is working, broken, or redirecting visitors somewhere else. You get back the exact status number (like 200 for OK, 404 for not found, 500 for server error), whether the address redirects, and where it redirects to. Great for finding broken links, verifying website migrations, and running quick SEO audits without writing any code.

## Output

Returns for each submitted URL: the HTTP status code (e.g. 200, 301, 404, 500), whether the URL redirects, and the destination URL if a redirect is present. Allows quick triage of working, broken, and redirecting pages.

## Example request

```json
{
 "urls": [
  "https://example.com",
  "https://example.com/old-page",
  "https://example.com/missing",
  "https://shop.example.com",
  "https://blog.example.com"
 ]
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "urls": {
   "type": "array",
   "description": "A list of 1 to 10 web addresses you want to check. Each address must start with http:// or https://."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "results": [
   {
    "url": "https://onescales.com",
    "error": "",
    "isRedirect": false,
    "statusCode": 200,
    "redirectURL": ""
   },
   {
    "url": "https://onescales.com/pages/contact",
    "error": "",
    "isRedirect": false,
    "statusCode": 200,
    "redirectURL": ""
   }
  ],
  "api_version": "1.0.0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/http-status-checker-315d9f5c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from http-status-checker.underscoredone.com](https://www.zero.xyz/host/http-status-checker.underscoredone.com/llms.txt)