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API · /sslcheck-api

SSL Certificate API

healthy 3,172 Subscribers

Check any website's SSL/TLS certificate as an API. Pass a domain and the service performs a live TLS handshake and returns the certificate's subject and issuer, the validity window, the exact number of days until it expires, whether it is currently valid and trusted by a standard CA chain, the negotiated TLS protocol, serial number, SHA-256 fingerprint, key size and the full list of Subject Alternative Names (SANs). A lean expiry endpoint returns a simple ok / expiring_soon / expired status, perfect for uptime and certificate-expiry monitoring, dashboards, CI checks and security tooling. Self-contained — no third-party service. IP addresses and internal hosts are not supported.

#ssl #tls #certificate #security #devops #monitoring
api.oanor.com/sslcheck-api
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Machine-readable spec so AI agents can integrate this API.

/api/sslcheck-api/openapi.json
/api/sslcheck-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
107 ms
Server probes · 24h
Subscribers
3,172
active
Total calls
126
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 3,420 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 3,420 calls/month
  • 2 req/sec
  • Certificate + expiry check
  • No credit card
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Starter

€3.95 /month

  • 47,600 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 47.6k calls/month
  • 8 req/sec
  • SANs / chain trust / fingerprint
  • Email support
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Pro

€12.05 /month

  • 236,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 236k calls/month
  • 20 req/sec
  • Expiry monitoring / CI checks
  • Priority support
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Mega

€32.90 /month

  • 1,188,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.19M calls/month
  • 50 req/sec
  • Security-monitoring platform
  • Dedicated SLA
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Built by

P
PremiumApi

Related APIs

Other APIs with overlapping tags.

MTA-STS API

Inspect a domain's SMTP transport-security posture — whether mail servers are required to deliver inbound mail over authenticated TLS, protecting it from downgrade and man-in-the-middle attacks. Pass a domain and the service fetches the MTA-STS policy file from mta-sts.<domain>/.well-known/mta-sts.txt (its version, mode, the permitted MX hosts and max_age), the _mta-sts DNS TXT record (its policy id) and the _smtp._tls TLS-RPT record (the rua reporting address), then reports whether MTA-STS is actually enforced and a prioritised list of issues — no policy file, no DNS record, a mode of only "testing", or a missing TLS-RPT record. A second endpoint returns just the parsed policy file. The request is made server-side and private/internal targets are refused (SSRF-guarded). Built for email-deliverability and anti-downgrade-attack audits, vendor and third-party assessment, and compliance. An MTA-STS / TLS-RPT checker — the SMTP transport-security counterpart to the email-authentication analyzer (emailsec, which covers SPF, DKIM and DMARC), and distinct from raw DNS lookup (dns). No upstream key, no cache.

api.oanor.com/mtasts-api

OIDC Discovery API

Inspect any OpenID Connect / OAuth 2.0 provider. Pass an issuer (a domain, an issuer URL, or the full discovery URL) and the service fetches the provider's discovery document at /.well-known/openid-configuration, parses every endpoint — authorization, token, userinfo, jwks, registration, end-session, introspection, revocation and device-authorization — together with the supported scopes, response types, grant types, ID-token signing algorithms, PKCE methods and claims, then fetches the JWKS and summarises its signing keys (count, algorithms, key types and key IDs), and reports a validity check with any issues. A second endpoint fetches and summarises any JSON Web Key Set on its own. The request is made server-side and private/internal targets are refused (SSRF-guarded). Built for SSO and OAuth/OIDC integration, identity-provider configuration debugging (Auth0, Okta, Keycloak, Azure AD, Google), security review and monitoring of signing-key rotation. An OIDC discovery / JWKS inspector — distinct from the JWT toolkit (jwt), the security.txt parser (securitytxt) and the HTTP security-header grader (secheaders). No upstream key, no cache.

api.oanor.com/oidc-api

Subresource Integrity API

Generate Subresource Integrity (SRI) hashes for any web asset, so browsers can verify that a CDN-hosted script or stylesheet has not been tampered with. Pass a URL and the service fetches the asset and returns its sha256, sha384 and sha512 SRI hashes, the chosen integrity value (sha384 by default, or pass your preferred algorithm), the asset's size and content type, and a ready-to-paste <script> or <link> tag complete with the integrity and crossorigin attributes. A verify endpoint re-fetches the asset and tells you whether it still matches a known integrity string — catching silent CDN changes or supply-chain tampering before your users hit them. The request is made server-side; private and internal targets are refused (SSRF-guarded). Built for securing third-party scripts, supply-chain hardening, build pipelines and CSP/SRI compliance. A Subresource Integrity generator and verifier — distinct from raw cryptographic hashing of input data (hash), the HTTP security-header grader (secheaders) and the SSL/TLS certificate check (sslcheck). No upstream key, no cache.

api.oanor.com/sri-api

Vulnerability Intelligence API

Prioritise CVEs by real-world exploitation risk — not just severity. Combines the FIRST.org EPSS score (the probability, 0 to 1, that a CVE will be exploited in the next 30 days, with its percentile rank) and the CISA KEV catalog (vulnerabilities confirmed to be actively exploited in the wild — with the vendor, product, date added, remediation due date and whether the flaw is used in ransomware campaigns), and derives a single priority level for each CVE. Look up to 25 CVEs in one call, browse the full CISA Known Exploited Vulnerabilities catalog filtered by vendor, product or ransomware use, or list the CVEs with the highest current EPSS scores. Built for vulnerability management, patch prioritisation, risk scoring and security dashboards — answering not "how bad could this be?" but "how likely is it to actually be exploited?". A vulnerability-prioritisation layer — distinct from raw CVE details and CVSS severity (cve), password-breach checks (pwned) and the HTTP security-header grader (secheaders). Data live from FIRST.org and CISA. No upstream key, no cache.

api.oanor.com/vulnintel-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for SSL Certificate API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call SSL Certificate API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for SSL Certificate API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does SSL Certificate API cost?
SSL Certificate API has a free tier with 100 calls / month. Paid plans start at €3.95 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is SSL Certificate API GDPR-compliant?
All requests to SSL Certificate API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/sslcheck-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/sslcheck-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/sslcheck-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/sslcheck-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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