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API · /setops-api

Set Operations API

healthy 4,114 Subscribers

Treat lists as sets. Compute the union, intersection, difference or symmetric difference of two lists; deduplicate a single list; and compare two lists to learn whether one is a subset of the other, whether they are equal as sets, whether they are disjoint and how many items they share. Items can be plain strings (comma- or newline-separated) or arbitrary JSON values, and an optional case-insensitive mode treats differently-cased strings as equal. Order is preserved (first occurrence wins). Perfect for data wrangling and reconciliation, tag and permission maths, deduplication, A/B list comparison and ETL. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from CSV/JSON toolkits — this is pure set logic.

#sets #lists #union #intersection #data #developer-tools
api.oanor.com/setops-api
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Machine-readable spec so AI agents can integrate this API.

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

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

Set Operations API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
82 ms
Server probes · 24h
Subscribers
4,114
active
Total calls
76
last 7 days
status Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,155 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,155 calls/month
  • 2 req/sec
  • Operate + dedupe + compare
  • No credit card
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Starter

€1.95 /month

  • 9,950 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 9.95k calls/month
  • 8 req/sec
  • JSON values + case-insensitive
  • Email support
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Pro

€21.85 /month

  • 150,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 150.5k calls/month
  • 20 req/sec
  • Data-wrangling / ETL pipelines
  • Priority support
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Mega

€59.85 /month

  • 795,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 795k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Income-inequality data for every country as an API — the World Bank Gini index, the standard measure of how evenly income is distributed. The coefficient runs from 0 (perfect equality) to 100 (one person holds all income); a higher number means a more unequal society. For each of 170+ countries the API returns the latest available value, the full year-by-year history and the all-time minimum and maximum, enriched with the ISO 3166-1 alpha-2 code and flag emoji. Look a country up by name or code, RANK countries by their latest inequality (the most or least equal in the world), search, or list them all. The reference an economics dashboard, data-journalism piece or research tool needs. Distinct from countrystats-api (area, population, life expectancy) — this is the inequality series specifically, with per-country history. Served from memory — always fast.

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Set Operations API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Set Operations API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Set Operations 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 Set Operations API cost?
Set Operations API has a free tier with 100 calls / month. Paid plans start at €1.95 / 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 Set Operations API GDPR-compliant?
All requests to Set Operations 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/setops-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/setops-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/setops-api/SOME_PATH");
curl_setopt($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/setops-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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