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API · /certdecode-api

Certificate Decoder API

healthy 3,550 Subscribers

Decode an X.509 certificate (PEM) into readable details — without a live connection. Paste a certificate and get back its subject and issuer (parsed into fields), the validity window with days-until-expiry and an expired flag, the serial number, SHA-1 and SHA-256 fingerprints, the Subject Alternative Names, the public-key type and size, and the CA / self-signed flags. Pure local parsing with no third-party service. Live, nothing stored. 2 endpoints. Built for certificate inspection, CI/CD expiry checks, PKI debugging and audit tooling. Distinct from a live SSL/TLS endpoint checker — this decodes a certificate you already hold.

#certificate #x509 #ssl #tls #pki #developer-tools
api.oanor.com/certdecode-api
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Machine-readable spec so AI agents can integrate this API.

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

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

Certificate Decoder API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
80 ms
Server probes · 24h
Subscribers
3,550
active
Total calls
38
last 7 days
status Full status page → · 4 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,140 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,140 calls/month
  • 2 req/sec
  • Full X.509 fields
  • No credit card
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Starter

€3.20 /month

  • 10,500 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 10.5k calls/month
  • 8 req/sec
  • SAN + fingerprints
  • Email support
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Pro

€22.80 /month

  • 146,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 146k calls/month
  • 20 req/sec
  • CI expiry checks / PKI
  • Priority support
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Mega

€58.80 /month

  • 750,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 750k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Built by

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api.oanor.com/csr-api

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api.oanor.com/mimetypes-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Certificate Decoder API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Certificate Decoder API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Certificate Decoder 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 Certificate Decoder API cost?
Certificate Decoder API has a free tier with 100 calls / month. Paid plans start at €3.20 / 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 Certificate Decoder API GDPR-compliant?
All requests to Certificate Decoder 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/certdecode-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/certdecode-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/certdecode-api/SOME_PATH");
curl_setopt($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/certdecode-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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