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API · /csr-api

CSR API

healthy 4,339 Subscribers

Generate and parse X.509 Certificate Signing Requests (PKCS#10) — the CSRs you submit to a Certificate Authority to obtain a TLS certificate. Generate a CSR from a common name plus optional organisation, country, locality and Subject Alternative Names, and get back the CSR together with a freshly-generated RSA private key (2048/3072/4096). Or parse an existing CSR to read its subject, SANs, key size and whether its signature is valid. Pure local processing — no key, no third-party service. Note: for development and testing; keep production private keys offline. Live, nothing stored. 3 endpoints. Distinct from key-pair generation, certificate decoding and live SSL checks.

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

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

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

CSR API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
193 ms
Server probes · 24h
Subscribers
4,339
active
Total calls
57
last 7 days
status Full status page → · 6 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,120 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,120 calls/month
  • 2 req/sec
  • Generate + parse
  • No credit card
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Starter

€3.00 /month

  • 10,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 10k calls/month
  • 8 req/sec
  • SANs + RSA up to 4096
  • Email support
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Pro

€22.60 /month

  • 144,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 144k calls/month
  • 20 req/sec
  • TLS provisioning pipelines
  • Priority support
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Mega

€58.60 /month

  • 740,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 740k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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api.oanor.com/sslcheck-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 CSR API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call CSR API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for CSR 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 CSR API cost?
CSR API has a free tier with 100 calls / month. Paid plans start at €3.00 / 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 CSR API GDPR-compliant?
All requests to CSR 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/csr-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/csr-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/csr-api/SOME_PATH");
curl_setopt($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/csr-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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