# SSL Certificate Lookup by Domain

> SSL Certificate Lookup by Domain is a paid API for AI agents from skinwinking.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).

Returns the number of active SSL certificates and the soonest expiry in days for a given domain name.

## Facts

- Endpoint: GET https://skinwinking.com/api/v1/web/ssl-certificates?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ssl-certificate-lookup-by-domain-dba262db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yszeyPQ6ccozlMwl8VouD

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-certificate-lookup-by-domain-dba262db
```

Example prompt: How many active SSL certificates does stripe.com have and when does the soonest one expire?

## When to prefer this

Use this endpoint when you need a quick, structured summary of SSL certificate health for a domain — specifically active certificate count and days-to-expiry — without needing full certificate chain details. Ideal for automated monitoring, security audits, and pre-deployment checks where a lightweight pay-per-call model is preferable to running a full certificate transparency search.

## Known failure modes

- Missing or invalid domain parameter returns a validation error
- Domain not found or no certificates in transparency logs returns empty or zero counts
- Rate limiting or payment failure via x402 returns 402 Payment Required
- Malformed domain string (e.g. missing TLD) may return an error or empty result

## How this service works

50 pay-per-call tools for agents over x402 (USDC on Base, Polygon, Solana): crypto market data, token audits, indicators, swap routing, web extraction, DNS/WHOIS/email checks, FX, weather and AI text/image tools.

## Output

Returns a JSON object with the count of active SSL certificates for the domain and the number of days until the soonest certificate expiry (e.g. {"activeCertificates": 4, "soonestExpiryDays": 31}).

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "limit": {
       "type": "integer",
       "default": 20,
       "maximum": 100,
       "minimum": 1
      },
      "domain": {
       "type": "string",
       "description": "Domain name"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "soonestExpiryDays": 31,
  "activeCertificates": 4
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ssl-certificate-lookup-by-domain-dba262db/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from skinwinking.com](https://www.zero.xyz/host/skinwinking.com/llms.txt)