Certificate transparency / subdomains API

Find every TLS certificate issued for a domain via crt.sh — which reveals its subdomains (attack-surface recon / asset discovery). Answers 'find subdomains of X', 'certificate history for this domain', 'enumerate this domain'.

Price$0.01per request

MethodPOST

Route/v1/security/cert-transparency

StatusLive

MIME typeapplication/json

Rate limit30/minute

Cache3600s public

securitycertificate-transparencysubdomainsreconcrtshosint

API URLhttps://x402.hexl.dev/v1/security/cert-transparency

Integration docs

Example request

{
  "domain": "example.com"
}

Example response

{
  "domain": "example.com",
  "certificateCount": 50,
  "subdomainCount": 3,
  "subdomains": [
    "www.example.com",
    "mail.example.com"
  ],
  "issuers": [
    "DigiCert Inc"
  ]
}

Input schema

{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "examples": [
        "example.com"
      ]
    },
    "limit": {
      "type": "number",
      "default": 100
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}