API · /unit-api

Unit Converter API

healthy 3,366 Subscribers

Fast, deterministic unit conversion across 10 categories — length, mass, temperature, area, volume, speed, time, digital storage, pressure and energy. Convert any value between compatible units and list the full unit catalog per category. Fully local compute (no third-party upstream), so responses are instant and always available. Ideal for calculators, e-commerce, logistics, engineering tools, dashboards and chatbots.

api.oanor.com/unit-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
73 ms
Server probes · 24h
Subscribers
3,366
active
Total calls
16
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 12,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 12,000 conversions/mo, 3 req/s
  • All 10 categories unlocked
  • No credit card
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Basic

€5.00 /month

  • 350,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 350,000 conversions/mo, 15 req/s
  • All 10 categories, commercial use
  • Email support
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Pro

€17.00 /month

  • 2,000,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 2,000,000 conversions/mo, 50 req/s
  • Batch conversion endpoint
  • Priority email support
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Mega

€44.00 /month

  • 10,000,000 calls / month
  • 150 requests / second
  • Hard cap (429 above quota, no overage)
  • 10,000,000 conversions/mo, 150 req/s
  • 99.9% uptime SLA
  • Priority support + dedicated key
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Built by

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Unit Converter API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Unit Converter API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Unit Converter 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 Unit Converter API cost?
Unit Converter API has a free tier with 100 calls / month. Paid plans start at €5.00 / 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 Unit Converter API GDPR-compliant?
All requests to Unit Converter 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/unit-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/unit-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/unit-api/SOME_PATH");
curl_setopt($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/unit-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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