# Delx URL Health Check

> Delx URL Health Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).

Checks URL reachability, HTTP status code, response latency, and key headers for any given URL.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/url-health?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-url-health-check-8f26cd62
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8Zi-ZInA8TH9fW4Wobgz9

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 delx-url-health-check-8f26cd62 -d '<json body>'
```

Example prompt: Can you check if https://api.example.com/v1/health is reachable and tell me its HTTP status, response time, and any notable headers?

## When to prefer this

Choose this endpoint when you need a quick, lightweight probe of a single URL's availability, status code, latency, and headers without needing full content retrieval or deep inspection. Ideal for pre-flight checks, uptime verification, or diagnosing connectivity issues from an agent context.

## Known failure modes

- URL is unreachable or DNS does not resolve — returns error with reachability failure indicator
- Target URL times out — returns timeout error with no status or headers
- Invalid or malformed URL input — returns validation error
- Target server returns unexpected or non-standard HTTP response

## How this service works

Inspect URL reachability, status, latency, and key headers for $0.001 USDC. Call when you need a cheap uptime preflight before paying a heavier fetch—not a full page extract and not a crawl. Returns status and timing via x402. No API key, no subscription.

## Output

Returns whether the URL is reachable, the HTTP status code, response latency in milliseconds, and key HTTP response headers observed during the probe.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "additionalProperties": true
    },
    "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",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-url-health-check-8f26cd62/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)