# Quant Agent Shop URL Status Check

> Quant Agent Shop URL Status Check is a paid API for AI agents from quantagentshop.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-23).

Checks a public URL's HTTP status, redirect chain, latency, content type, server header, and TLS certificate details without reading the page body.

## Facts

- Endpoint: POST https://quantagentshop.com/v1/url-status?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quant-agent-shop-url-status-check-fc8b76fe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_spcxIHfGLZRCdBKlS-gGn

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 quant-agent-shop-url-status-check-fc8b76fe -d '<json body>'
```

Example prompt: Before I share that link, can you check if https://example.com/report is actually up and reachable, and tell me what HTTP status it returns, how many redirects it goes through, and whether the HTTPS certificate is still valid?

## When to prefer this

Use this endpoint when you need a quick, lightweight probe of a URL's reachability, status, and TLS health without downloading or parsing page content. Prefer it over a full page-fetch endpoint when you only need availability and metadata, not content. It is ideal for link validation, certificate monitoring, and redirect chain inspection at low cost ($0.002/call) with sub-1-second typical latency.

## Known failure modes

- Invalid or malformed URL returns a validation error
- Private/internal URLs (non-public hosts) are rejected
- Rate limit exceeded: more than 10 checks per host per minute returns a 429
- DNS resolution failure for the given hostname
- Connection timeout if the host is unreachable but slow

## How this service works

URL status check. Send one public URL; returns the HTTP status, every redirect hop, latency, content type and length, server header and, for https, the certificate issuer and days left. GET only; the body is never read or returned. A site that is down is an answer, not an error. Use to check a link before using it. Each payer can check a host 10 times a minute. To read the page use /v1/fetch-page. Typical response under 1 s. Failed calls are not charged.

## Output

Returns the final HTTP status code, each redirect hop in the chain, round-trip latency, content-type and content-length headers, the server header, and (for HTTPS URLs) the TLS certificate issuer and days remaining until expiry. A site that is down returns its failure status rather than an error.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "title": "Url",
       "format": "uri",
       "maxLength": 2083,
       "minLength": 1,
       "description": "Public http or https URL to check."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "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/quant-agent-shop-url-status-check-fc8b76fe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quantagentshop.com](https://www.zero.xyz/host/quantagentshop.com/llms.txt)