Donor → recipient compatibility
API · /bloodtype-api
Blood Type API
healthy
4,209 Subscribers
Blood-type compatibility as an API, covering the ABO and Rh(D) systems, computed locally and deterministically. The compatibility endpoint says whether a given donor can give to a given recipient, for both red blood cells and plasma — the red-cell rule being that the donor's antigens must be a subset of the recipient's (Rh included), and plasma being the reverse and ignoring Rh. The info endpoint describes a blood type: the antigens it carries, the antibodies in its plasma, every type it can receive red cells from and donate red cells to, who it can give plasma to, whether it is a universal red-cell donor (O−), universal red-cell recipient (AB+) or universal plasma donor (AB), and its approximate US population frequency. The donors endpoint lists every compatible donor type for a recipient, for red cells or plasma. Blood types are accepted in many forms (O-, O neg, AB positive, …). Everything is computed locally and deterministically, so it is instant and private. This is educational only — real transfusion requires laboratory cross-matching and clinical judgement, and it is not medical advice. Ideal for medical-education and first-aid apps, blood-donation and health tools, and quiz and reference sites. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is ABO/Rh compatibility; for a drug reference database use a drug API.
api.oanor.com/bloodtype-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 75 ms
- Server probes · 24h
- Subscribers
- 4,209
- active
- Total calls
- 80
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 11,535 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 11,535 calls/month
- 2 req/sec
- Compatibility + info + donors
- No credit card
Starter
€13.05 /month
- 21,150 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 21.15k calls/month
- 8 req/sec
- Red cells + plasma rules
- Email support
Pro
€32.95 /month
- 261,500 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 261.5k calls/month
- 20 req/sec
- Health / education pipelines
- Priority support
Mega
€70.95 /month
- 1,350,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 1.35M calls/month
- 50 req/sec
- Platform scale
- Dedicated SLA
Built by
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api.oanor.com/protondb-api
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api.oanor.com/biorhythm-api
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api.oanor.com/fruit-api
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api.oanor.com/disease-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Blood Type API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Blood Type API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Blood Type 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 Blood Type API cost?
Blood Type API has a free tier with 100 calls / month. Paid plans start at €13.05 / 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 Blood Type API GDPR-compliant?
All requests to Blood Type 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/bloodtype-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/bloodtype-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/bloodtype-api/SOME_PATH");
curl_setopt($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/bloodtype-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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