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API · /abtest-api

A/B Bucketing API

healthy 3,216 Subscribers

Deterministic A/B testing and feature-flag assignment — no database, no stored state. The bucket endpoint hashes a key (a user id, session or device) into a stable bucket from 0 to N-1 that never changes for that key, and can decide whether the key is inside a percentage rollout; because the decision is monotonic, raising the percentage only ever adds users, so a gradual ramp-up is sticky and no one flips back out. The variant endpoint assigns one of several weighted variants — a simple control/treatment split or any multivariate test — consistently for the same key, honouring custom weights. Mixing in an experiment name keeps independent experiments independent, and because the same inputs always produce the same answer, your client and server (and any edge function) agree on the assignment without any coordination or lookups. Hashing is FNV-1a with an avalanche mix, giving uniform, stable buckets across languages and machines. It runs entirely locally, so it is instant, deterministic and private. Ideal for feature flags and gradual rollouts, A/B and multivariate experiments, canary releases, holdouts and kill-switches, and consistent UI bucketing across web and mobile. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This assigns experiments deterministically; to test whether a result is statistically significant use a statistics API.

#ab-testing #feature-flags #rollout #experiments #hashing #developer-tools
api.oanor.com/abtest-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
92 ms
Server probes · 24h
Subscribers
3,216
active
Total calls
36
last 7 days
status Full status page → · 18 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 3,035 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 3,035 calls/month
  • 2 req/sec
  • Bucket + variant
  • No credit card
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Starter

€4.55 /month

  • 12,550 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 12.55k calls/month
  • 8 req/sec
  • Sticky rollouts + weights
  • Email support
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Pro

€24.45 /month

  • 176,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 176.5k calls/month
  • 20 req/sec
  • Feature-flag / experiment pipelines
  • Priority support
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Mega

€62.45 /month

  • 925,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 925k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Birthday Paradox API

Birthday-paradox and collision-probability maths as an API, computed locally and deterministically. The probability endpoint computes the chance that at least two of n people share a birthday among d equally likely days, P = 1 − Π(1 − i/d), evaluated in log space for accuracy — the famous result that just 23 people give about a 50.7 % chance, 50 people about 97 % and 70 people about 99.9 %. The people-needed endpoint inverts it: the smallest group size to reach a target probability (23 for 50 %, 57 for 99 %), with the √(2·d·ln(1/(1−p))) approximation. The collision endpoint generalises the birthday bound to any space — pass a number of buckets or a hash size in bits — and returns the collision probability P ≈ 1 − e^(−n²/2d), the rule behind hash collisions and UUID-uniqueness estimates, where a 50 % chance needs roughly 1.177·√d items. Days and buckets default to 365. Everything is computed locally and deterministically, so it is instant and private. Ideal for probability-education, security, cryptography, hashing, data-engineering and statistics app developers, collision-risk and birthday-problem tools, and teaching material. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is the birthday/collision probability; for full distributions use a probability API.

api.oanor.com/birthdayparadox-api

Checksum API

Fast non-cryptographic checksums as an API. Compute CRC-32 — the integrity check used by ZIP, gzip, PNG and Ethernet — and Adler-32 — the checksum used by zlib — over UTF-8 text, hex or base64 input, returned in hex and as signed and unsigned 32-bit integers. Ideal for file- and message-integrity verification, cache keys and ETags, change detection and deduplication, where you want a quick fingerprint rather than a secure hash. Pure local computation — no key, no third-party service, instant; send binary via the hex or base64 encoding (up to 4 MB). Live, nothing stored. 4 endpoints. Explicitly NOT for security — for cryptographic digests (MD5, SHA-256, HMAC) use a hashing API instead.

api.oanor.com/checksum-api

Hammock Hang API

Hammock-hang maths as an API, computed locally and deterministically — the suspension-force, ridgeline and strap-height numbers a camper or hammock hanger sets up by. It all comes back to the 30-degree rule. The force endpoint shows why: the tension in each suspension line is the occupant weight ÷ (2 × sin of the hang angle), so at a 30° hang each strap carries about one body weight, but flatten the hang to 15° and it jumps to roughly 1.9 times — which is what over-stresses straps, trees and your back when people pull a hammock drum-tight. The ridgeline endpoint sizes a structural ridgeline at about 83 % of the hammock length, the fixed line that reproduces that ~30° lay and the right sag on any pair of trees. The strapheight endpoint estimates how high to attach the straps from the distance between the trees and the seat height you want, since trees farther apart need higher anchor points to hold the angle. Everything is computed locally and deterministically, so it is instant and private. Ideal for camping, backpacking, outdoor-gear and hammock app developers, hang-calculator and trip-planning tools, and adventure software. Pure local computation — no key, no third-party service, instant. Weight and lengths in your own unit. Live, nothing stored. 3 compute endpoints.

api.oanor.com/hammock-api

Caulk Coverage API

Caulk and sealant coverage maths as an API, computed locally and deterministically — the linear-feet-per-tube and how-many-tubes numbers a builder, glazier or DIYer buys sealant by. A bead of caulk is essentially a thin cylinder, so the coverage endpoint works out the feet a cartridge lays from the bead width: volume per foot ≈ (π/4 × width²) × 12 inches, and a standard 10.1 fl oz cartridge (18.2 in³) lays about 30 feet of a quarter-inch bead, 13 feet of a fat three-eighths or 55 of a fine three-sixteenths — pass cartridge_oz for sausage packs or 28-oz tubes, and a tube count to total it. The tubes endpoint runs it backwards: cartridges needed = (joint length × a waste factor) ÷ feet per cartridge, rounded up, so a 100-foot run of quarter-inch bead with 10 % waste takes four tubes. Everything is computed locally and deterministically, so it is instant and private. Ideal for construction, glazing, weatherproofing and home-improvement app developers, material-estimator and shopping-list tools, and contractor software. Pure local computation — no key, no third-party service, instant. Inches and feet; estimates — tooling and waste vary. Live, nothing stored. 2 compute endpoints.

api.oanor.com/caulk-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for A/B Bucketing API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call A/B Bucketing API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for A/B Bucketing 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 A/B Bucketing API cost?
A/B Bucketing API has a free tier with 100 calls / month. Paid plans start at €4.55 / 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 A/B Bucketing API GDPR-compliant?
All requests to A/B Bucketing 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/abtest-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/abtest-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/abtest-api/SOME_PATH");
curl_setopt($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/abtest-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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