# Strale URL Health Check

> Strale URL Health Check is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0324/call, status unknown (last checked 2026-09-14).

Checks the HTTP health and availability of any URL, returning status, response time, and redirect chain information.

## Facts

- Endpoint: GET https://api.strale.io/x402/v2/url-health-check
- Price: $0.0324/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/strale-url-health-check-2e80904d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I9-qlhpe1ZWuSfjtewF3V

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 strale-url-health-check-2e80904d
```

Example prompt: Can you check if https://example.com is up and responding — use a GET request and follow any redirects?

## When to prefer this

Choose this endpoint when you need a quick, auditable HTTP health check on a single URL with cryptographic proof of the check. Prefer it over generic ping tools when you need a tamper-evident audit trail, redirect chain tracking, or when the result will be used in a compliance or trust context. It is ideal for pre-flight checks before agent workflows depend on an external resource.

## Known failure modes

- URL is malformed or missing — returns validation error
- Target URL times out — returns timeout error with elapsed time
- DNS resolution failure for the target host — returns connection error
- URL returns a non-2xx status — still returned as valid response with status code
- Network-level block or firewall prevents probe — returns connection refused error

## How this service works

The trust layer for AI agents — 250+ independently tested data capabilities across 27 countries. Execute capabilities via REST, MCP, A2A, or x402 micropayments. Every call returns an audit record with cryptographic chain hashing.

## Output

Returns the HTTP status code, response time, redirect chain (if any), and an audit record with cryptographic chain hashing confirming the check was performed. Includes availability verdict and any error details if the URL is unreachable.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ]
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "URL to check"
      },
      "timeout": {
       "type": "integer"
      },
      "follow_redirects": {
       "type": "boolean"
      }
     }
    }
   },
   "required": [
    "type",
    "method"
   ],
   "additionalProperties": false
  }
 },
 "required": [
  "input"
 ]
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/strale-url-health-check-2e80904d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.strale.io](https://www.zero.xyz/host/api.strale.io/llms.txt)