# Vextorium SSL Certificate Inspector

> Vextorium SSL Certificate Inspector is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).

Retrieves and analyzes the TLS/SSL certificate of a domain, returning issuer, validity dates, days remaining, SANs, trust status, TLS version, and cipher suite.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/ssl-certificate?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-ssl-certificate-inspector-4b2c8b5e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HvNfI79SbdLZteUZNDjs3

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 vextorium-ssl-certificate-inspector-4b2c8b5e -d '<json body>'
```

Example prompt: Check the SSL certificate for example.com on port 443 — I want to know who issued it, when it expires, how many days are left, what TLS version is being used, and whether it actually covers that domain.

## When to prefer this

Choose this endpoint when you need detailed, structured TLS certificate metadata for a single domain — including expiry countdown, issuer identity, cipher suite, TLS version, and SAN coverage — for use in uptime monitoring pipelines, security audits, or certificate lifecycle alerting. Prefer this over generic WHOIS or DNS lookups when the specific focus is SSL/TLS layer information rather than domain registration or DNS records.

## Known failure modes

- Domain does not exist or is unreachable — status error, null fields
- Port not open or no TLS listener on specified port — connection refused
- Certificate is expired — remaining_days will be negative
- Certificate does not cover the requested domain — covers_domain: false
- Self-signed or untrusted certificate — confidence: false
- Invalid domain format in request body — validation error

## How this service works

TLS certificate of a domain: issuer, validity dates, days until expiry, names covered (SAN), whether it matches the domain and is trusted, TLS version and cipher. For uptime and security monitoring.

## Output

Returns a JSON object with: IP address, TLS version (e.g. TLSv1.3), port, list of subject alternative names, domain, issuer (e.g. Let's Encrypt), status (ok/error), subject, cipher suite, whether the cert is trusted (confidence), valid_since and valid_until timestamps, total duration_days, and remaining_days until expiry.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "domain"
     ],
     "properties": {
      "port": {
       "type": "integer",
       "description": "443 (default), 8443, 465, 993, 995..."
      },
      "domain": {
       "type": "string"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "ip": {
       "type": [
        "string",
        "null"
       ]
      },
      "tls": {
       "type": [
        "string",
        "null"
       ]
      },
      "port": {
       "type": [
        "number",
        "null"
       ]
      },
      "names": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "null",
         "string"
        ]
       }
      },
      "domain": {
       "type": [
        "string",
        "null"
       ]
      },
      "issuer": {
       "type": [
        "string",
        "null"
       ]
      },
      "status": {
       "type": [
        "string",
        "null"
       ]
      },
      "subject": {
       "type": [
        "string",
        "null"
       ]
      },
      "encrypted": {
       "type": [
        "string",
        "null"
       ]
      },
      "confidence": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "valid_since": {
       "type": [
        "string",
        "null"
       ]
      },
      "valid_until": {
       "type": [
        "string",
        "null"
       ]
      },
      "covers_domain": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "duration_days": {
       "type": [
        "number",
        "null"
       ]
      },
      "remaining_days": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ip": "188.114.96.5",
  "tls": "TLSv1.3",
  "port": 443,
  "names": [
   "*.vextorium.com",
   "vextorium.com"
  ],
  "domain": "vextorium.com",
  "issuer": "Let's Encrypt",
  "status": "ok",
  "subject": "vextorium.com",
  "encrypted": "TLS_AES_256_GCM_SHA384",
  "confidence": true,
  "valid_since": "2026-09-27T13:30:10+00:00",
  "valid_until": "2026-12-26T13:30:09+00:00",
  "covers_domain": true,
  "duration_days": 89,
  "remaining_days": 84.9
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-ssl-certificate-inspector-4b2c8b5e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)