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API · /biorhythm-api

Biorhythm API

healthy 3,768 Subscribers

Biorhythm calculation as an API, computed locally and deterministically — a fun, for-entertainment model of three sine-wave cycles that supposedly run from the day you are born: a 23-day physical cycle, a 28-day emotional cycle and a 33-day intellectual cycle, each given by sin(2π·days/period). The cycles endpoint computes the three percentages and their phase (rising, falling or a critical zero-crossing where the cycle changes sign) for a given date, plus the average. The range endpoint returns the daily values over a window of up to 60 days from a start date, ready to plot as three sine waves. The compatibility endpoint compares two birthdates and gives, for each cycle, a defined heuristic compatibility score (1 + cos(2π·Δdays/period))/2 — 100 % when two people's cycles are perfectly in phase and 0 % when exactly opposite — and an overall score. Dates are in YYYY-MM-DD form. Biorhythms have no scientific basis; this is purely an entertainment tool. Everything is computed locally and deterministically, so it is instant and private. Ideal for lifestyle, horoscope, wellness, game and novelty app developers, daily-widget and compatibility tools, and fun dashboards. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is the entertainment biorhythm; for name and birthdate numerology use a numerology API and for star signs a zodiac API.

#biorhythm #lifestyle #cycles #compatibility #novelty #developer-tools
api.oanor.com/biorhythm-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
88 ms
Server probes · 24h
Subscribers
3,768
active
Total calls
24
last 7 days
status Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 6,000 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 6,000 calls/month
  • 2 req/sec
  • Cycles + range + compatibility
  • No credit card
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Starter

€3.00 /month

  • 50,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 50,000 calls/month
  • 6 req/sec
  • Phases, 60-day series, compatibility
  • Email support
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Pro

€9.00 /month

  • 210,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 210,000 calls/month
  • 15 req/sec
  • Lifestyle-app & widget pipelines
  • Priority support
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Mega

€29.00 /month

  • 1,280,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,280,000 calls/month
  • 40 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Dog & Cat Age API

Pet-age conversion as an API, computed locally and deterministically. The dog endpoint converts a dog’s age in years to a human-equivalent age three ways: the modern epigenetic model from the 2019 UCSD DNA-methylation study, human = 16·ln(dog_age) + 31 (valid from age 1), which makes a 1-year-old dog about 31, a 4-year-old about 53 and a 10-year-old about 68 human years; the American Kennel Club size-based table for small, medium, large and giant breeds, interpolated between yearly anchor points so a large breed ages faster late in life; and the old ×7 rule of thumb for comparison. The cat endpoint converts a cat’s age, counting 15 human years in the first year, 24 by the second, and four per year after that, so a 10-year-old cat is about 56. Ages are in years and decimals are allowed. Everything is computed locally and deterministically, so it is instant and private. Ideal for pet, veterinary, animal-shelter, pet-insurance and lifestyle app developers, dog-years and pet-profile widgets, and fun tools. These are estimates for general guidance, not veterinary advice. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 2 endpoints. This is pet-to-human age; for human body metrics use a BMI or body-fat API.

api.oanor.com/dogage-api

Zodiac API

Turn a birth date into zodiac signs as an API. Get the Western (tropical) sun sign for any date — its symbol, element (Fire, Earth, Air, Water), quality, ruling planet, polarity, key traits and the signs it is most compatible with (e.g. 15 July → Cancer, Water, ruled by the Moon). Look up a sign by name, get the Chinese zodiac animal, element and yin/yang for any year (e.g. 2020 → Metal Rat), or fetch both Western and Chinese signs from a full birth date at once. Everything is computed locally, so it is fast and always available. Ideal for horoscope and astrology apps, dating and matchmaking, onboarding personalisation, content sites and fun widgets.

api.oanor.com/zodiac-api

Blood Type API

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

Tire Calculator API

Tire maths as an API, computed locally and deterministically — the size, pressure and speedometer numbers a driver, fitter or fleet manager works out before fitting a tyre. The size endpoint turns a P-metric spec into the real dimensions: overall diameter = rim + 2 × the sidewall (section width × aspect ratio), so a 225/45R17 stands about 25 inches tall, rolls a 78-inch circumference and turns roughly 808 times a mile — the numbers behind fitment, gearing and clearance. The pressure endpoint gives the hot pressure from a cold pressure and the temperature change, because pressure tracks absolute temperature (P2/P1 = T2/T1), about +1 psi per 10 °F — so 32 psi set cold at 70 °F reads ~34.6 after warming to 100 °F, and drops on a cold morning, which is what trips the warning light. The speedo-error endpoint gives the speedometer error and true speed from a tyre-size change: a taller tyre makes the speedo read low, so actual speed = indicated × new diameter ÷ old — go up 4 % and 60 on the dial is really 62.5. Everything is computed locally and deterministically, so it is instant and private. Ideal for tyre-shop and fitment apps, fleet and 4x4 build tools, speedo-recalibration calculators, and automotive sites. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. Estimates — always set pressure cold to the placard.

api.oanor.com/tire-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

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

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