# Mat Web & Data Toolkit – SSL Certificate Checker

> Mat Web & Data Toolkit – SSL Certificate Checker is a paid API for AI agents from automatom.matt-d59.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Fetches and returns SSL/TLS certificate details for a given hostname, including validity dates, issuer, SANs, and days remaining.

## Facts

- Endpoint: GET https://automatom.matt-d59.workers.dev/ssl?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mat-web-data-toolkit-ssl-certificate-checker-b1739a0e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-0bZeiPhxbf-xzxo1sVkA

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 mat-web-data-toolkit-ssl-certificate-checker-b1739a0e
```

Example prompt: Can you check the SSL certificate for github.com and tell me who issued it, when it expires, and how many days are left?

## When to prefer this

Use this endpoint when you need live SSL/TLS certificate metadata for a specific hostname, including expiry details and certificate transparency records. Prefer it over generic WHOIS or DNS tools when the specific question is about HTTPS certificate validity, issuer trust, or SAN coverage rather than domain registration or DNS records.

## Known failure modes

- Host not found or unreachable — error field populated, authorized: false
- Domain has no HTTPS/TLS — connection refused or timeout
- Invalid hostname format in query parameter — likely returns an error JSON
- Certificate transparency lookup failure (crt.sh unavailable) — partial data may be returned
- Expired certificate — authorized may be false with negative days_left

## How this service works

Fetches a public web page and returns its title, meta description, outbound links and readable plain text as JSON.

## Output

A JSON object containing: the hostname, the certificate issuer (C, O, CN), subject CN, Subject Alternative Names (SANs), serial number, valid_from and valid_to timestamps, days_left until expiry, a boolean authorized flag, the crt.sh certificate transparency ID, and a source description. An error field is present if the check failed.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "host"
     ],
     "properties": {
      "host": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "san": [
   "*.example.com",
   "example.com"
  ],
  "host": "example.com",
  "error": null,
  "issuer": {
   "C": "US",
   "O": "SSL Corporation",
   "CN": "Cloudflare TLS Issuing ECC CA 3"
  },
  "serial": "01eee6aabb521d5e14fc315fd9985690",
  "source": "live HTTPS check + crt.sh certificate transparency",
  "subject": {
   "CN": "example.com"
  },
  "crtsh_id": 29581277802,
  "valid_to": "2026-12-25T22:56:35.000Z",
  "days_left": 69,
  "authorized": true,
  "valid_from": "2026-09-26T22:49:11.000Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mat-web-data-toolkit-ssl-certificate-checker-b1739a0e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from automatom.matt-d59.workers.dev](https://www.zero.xyz/host/automatom.matt-d59.workers.dev/llms.txt)