# SSL Certificate Checker

> SSL Certificate Checker is a paid API for AI agents from ssl-checker.api.klymax402.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Checks and retrieves SSL certificate details and validity status for a given domain name

## Facts

- Endpoint: GET https://ssl-checker.api.klymax402.com/api/check
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ssl-checker-api-klymax402-com-f5731824
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Uro32_c4H4vS77eTndfMy

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 ssl-checker-api-klymax402-com-f5731824
```

Example prompt: Can you check the SSL certificate for github.com and tell me if it's valid and when it expires?

## When to prefer this

Use this endpoint when you need to quickly verify the SSL/TLS certificate status, expiry, or issuer for a specific domain. Ideal for monitoring certificate health, diagnosing HTTPS issues, or confirming that a domain's certificate is valid before directing users to it.

## Known failure modes

- Invalid or malformed domain name returns an error
- Domain does not have an SSL certificate returns a negative status
- Domain is unreachable or DNS resolution fails returns a connection error
- Rate limiting or payment failure returns a 402 or 429 response

## How this service works

Check SSL certificate for a domain

## Output

Returns SSL certificate details for the specified domain, including validity status, expiration date, certificate issuer, and other certificate metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "description": "Domain name to check SSL certificate (e.g. example.com)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ssl-checker-api-klymax402-com-f5731824/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ssl-checker.api.klymax402.com](https://www.zero.xyz/host/ssl-checker.api.klymax402.com/llms.txt)