# SSL/TLS Certificate Inspector

> SSL/TLS Certificate Inspector is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.0022/call, status unknown (last checked 2026-09-15).

Performs a full TLS handshake inspection for a given domain and returns certificate details including issuer, subject, SANs, validity dates, days remaining, fingerprint, serial number, protocol, and cipher suite.

## Facts

- Endpoint: GET https://api.x402node.dev/url/ssl-check
- Price: $0.0022/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-x402node-dev-87432c77
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Vmqeu-gTS6rUFrgPasEBb

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 api-x402node-dev-87432c77
```

Example prompt: Can you check the SSL certificate for api.stripe.com — I want to know how many days are left before it expires, who issued it, what TLS protocol and cipher it's using, and the SHA-256 fingerprint?

## When to prefer this

Use this endpoint when you need programmatic, structured TLS certificate metadata for a domain — especially for security audits, certificate expiration monitoring, HTTPS infrastructure validation pipelines, or AI agent workflows that need to assess a site's security posture. Prefer this over manual browser inspection or general-purpose HTTP tools when you need machine-readable cert details including SANs, fingerprint, cipher, and protocol in a single call.

## Known failure modes

- Domain does not exist or is unreachable — connection timeout or DNS resolution failure
- Domain has no HTTPS listener on the specified port — connection refused
- Invalid domain format in request body — validation error
- Expired or self-signed cert may still return data but with valid=false and expired=true
- Network or TLS handshake failure on the server side — may return error response

## How this service works

ssl certificate checker, SSL certificate validator, check SSL certificate, SSL certificate expiration, HTTPS certificate check, SSL chain analyzer. Get full TLS handshake details for any domain: issuer, subject, SANs, validity dates, days remaining, fingerprint, serial, protocol, cipher. For AI agents, security audits, monitoring, HTTPS pipelines, tls certificate check, certificate expiry Accepts payment on Base or Solana — either network works.

## Output

Returns a JSON object containing: domain, validity boolean, days remaining, validFrom/validTo timestamps, expired flag, issuer object, subject object, subjectAltNames string, serial number, SHA-256 fingerprint, TLS protocol string, cipher suite object, port, and a request timestamp.

## 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": [
      "domain"
     ],
     "properties": {
      "port": {
       "type": "string",
       "description": "Port (optional)"
      },
      "domain": {
       "type": "string",
       "description": "Domain name (required)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-x402node-dev-87432c77/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x402node.dev](https://www.zero.xyz/host/api.x402node.dev/llms.txt)