# URL Security Headers Checker

> URL Security Headers Checker is a paid API for AI agents from agent-json-reliability.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Fetches a URL and checks the HTTP security headers present in the response, reporting on header presence and compliance.

## Facts

- Endpoint: POST https://agent-json-reliability.onrender.com/v1/url/security-headers?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/url-security-headers-checker-b05a5e9f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QJ3qz0jmri7T40Ie2AeSq

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 url-security-headers-checker-b05a5e9f -d '<json body>'
```

Example prompt: Can you check the security headers on https://example.com and tell me which ones are missing or misconfigured?

## When to prefer this

Choose this endpoint when you need a quick, automated check of HTTP security headers for a specific URL — particularly useful for pre-deployment audits, compliance validation, or monitoring third-party endpoints for security posture. It is part of a broader JSON reliability and agent tooling suite, making it convenient when already using that platform.

## Known failure modes

- URL is unreachable or returns a network error
- Invalid or malformed URL provided
- Target server blocks automated requests or returns 403
- Timeout if the remote server is slow to respond
- HTTPS certificate errors on the target URL

## How this service works

Deterministic JSON repair and JSON Schema validation for AI agents. Free MCP, inspect, validate, repair. Paid POST /v1/json/reliable 0.003 USDC via x402 on Base.

## Output

Returns an object indicating which HTTP security headers are present or absent on the given URL, along with a success/ok status and per-header compliance details.

## Response schema (JSON Schema)

```json
{
 "example": {
  "ok": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/url-security-headers-checker-b05a5e9f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-json-reliability.onrender.com](https://www.zero.xyz/host/agent-json-reliability.onrender.com/llms.txt)