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API · /stats-api

Statistics API

healthy 3,025 Subscribers

Run statistics on a list of numbers without a spreadsheet or a stats package. The describe endpoint returns a full summary of a dataset — count, sum, min, max, range, mean, median, mode, the first and third quartiles and interquartile range, population and sample variance and standard deviation, coefficient of variation, geometric and harmonic means, skewness and kurtosis. Get any percentile of a dataset, the Pearson correlation coefficient (and r²) between two equal-length series, and a simple linear regression (slope, intercept, r² and the line equation). Input is a raw array of numbers (JSON or a comma-separated list) — no CSV, no headers. Perfect for analytics, A/B test summaries, sensor and metrics data, dashboards and quick exploratory analysis. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. Distinct from the mathjs expression engine and from CSV per-column summaries.

#statistics #data #analytics #regression #math #developer-tools
api.oanor.com/stats-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
87 ms
Server probes · 24h
Subscribers
3,025
active
Total calls
70
last 7 days
status Full status page → · 25 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,020 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,020 calls/month
  • 2 req/sec
  • Describe + percentile + correlation + regression
  • No credit card
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Starter

€2.40 /month

  • 8,700 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 8.7k calls/month
  • 8 req/sec
  • Full descriptive summary
  • Email support
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Pro

€21.60 /month

  • 138,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 138k calls/month
  • 20 req/sec
  • Analytics / dashboard pipelines
  • Priority support
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Mega

€57.60 /month

  • 710,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 710k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Statistical Inference API

Inferential-statistics maths as an API, computed locally and deterministically. The samplesize endpoint computes how many respondents a survey or experiment needs for a proportion, n = Z²·p(1−p)/E², from a confidence level and a margin of error (using p = 0.5 for the most conservative size), with a finite-population correction when the population is known. The confidence endpoint builds a confidence interval for a mean (estimate ± Z·σ/√n) or a proportion (p ± Z·√(p(1−p)/n)), returning the standard error, margin of error and the lower and upper bounds. The ztest endpoint runs a one-sample z-test, z = (x̄ − μ₀)/(σ/√n), and returns the z-score, the one- or two-tailed p-value and whether the result is significant at the chosen alpha. The z-scores come from an exact inverse-normal and the p-values from the normal CDF. Everything is computed locally and deterministically, so it is instant and private. Ideal for A/B-testing, survey, research and analytics app developers, experiment dashboards and data-science tools, and education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is inferential statistics; for descriptive statistics use a statistics API and for probability distributions use a probability API.

api.oanor.com/inference-api

Statistics Calculator API

Descriptive-statistics maths as an API, computed locally and deterministically. The descriptive endpoint summarises a list of numbers — the count, sum, mean, median, mode, minimum, maximum and range, the population and sample variance and standard deviation, and the quartiles Q1/Q2/Q3 with the interquartile range by Tukey's method. The correlation endpoint computes the Pearson correlation coefficient r between two equal-length series — from −1 (perfect inverse) through 0 (none) to +1 (perfect direct) — along with R² and the covariance. The regression endpoint fits a least-squares line y = a + b·x, returning the slope, intercept and R², the equation, and an optional prediction for a given x. Data is accepted as a JSON array or a comma-separated list. Everything is computed locally and deterministically, so it is instant and private. Ideal for data-analysis, dashboard, research and education app developers, reporting and BI tools, and spreadsheet replacements. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is descriptive statistics; for probability distributions and combinatorics use a probability API.

api.oanor.com/statistics-api

Probability API

Probability distributions and combinatorics as an API. The binomial endpoint gives the probability of exactly k successes in n trials (PMF), the cumulative probability up to k (CDF), and the mean, variance and standard deviation. The poisson endpoint does the same for the Poisson distribution from a rate λ. The normal endpoint computes the z-score, probability density, cumulative probability (CDF) and percentile for a value under a normal distribution with any mean and standard deviation — and runs in reverse, turning a probability into the value (the quantile / inverse CDF) and its z-score. The combinatorics endpoint computes combinations (nCr), permutations (nPr) and factorials with exact big-integer arithmetic. Everything is computed locally and deterministically, so it is instant and private. Ideal for data science and statistics, quality control and A/B-test planning, gaming and gambling odds, risk modelling, and statistics education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This is probability theory; for descriptive statistics on a dataset use a statistics API and for general expression evaluation use a math API.

api.oanor.com/probability-api

Eurostat API

Official European Union statistics as an API, powered by Eurostat — the statistical office of the EU. Eurostat publishes harmonised data across every EU and EFTA country and region: population and demography, GDP and national accounts, employment and unemployment, inflation (HICP), trade, energy, migration, education, health and thousands more datasets. This API wraps Eurostat's JSON-stat dissemination service into clean, decoded rows, and adds friendly named indicators so you don't have to learn dataset codes. /v1/indicator?indicator=population&geo=DE&year=2023 returns a named statistic — population, gdp, gdp_per_capita, unemployment, inflation or employment — for one or more countries (2-letter codes such as DE, FR, IT, or aggregates like EU27_2020 and EA20) and one or more years, with no need to know the underlying dataset or dimension codes. /v1/data?dataset=demo_pjan&geo=DE&sex=T&age=TOTAL&time=2023 gives direct access to any of Eurostat's thousands of datasets by its code, with arbitrary dimension filters passed as query parameters — every dataset has its own dimensions (geo, time, sex, age, unit, na_item, coicop and so on). Both endpoints decode Eurostat's JSON-stat format automatically: single-value dimensions are lifted into a `fixed` context block, and each row carries the dimensions that actually vary (with both a human-readable label and the underlying code) alongside the numeric value, the dataset label and the last-update date. Ideal for economic dashboards, country comparison tools, research, data journalism and policy analysis. Country codes are 2-letter ISO; aggregates include EU27_2020 and EA20. Data © European Union, free to reuse with attribution.

api.oanor.com/eurostat-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Statistics API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Statistics API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Statistics 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 Statistics API cost?
Statistics API has a free tier with 100 calls / month. Paid plans start at €2.40 / 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 Statistics API GDPR-compliant?
All requests to Statistics 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/stats-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/stats-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/stats-api/SOME_PATH");
curl_setopt($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/stats-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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