A number across common bases
API · /baseconvert-api
Number Base Converter API
healthy
4,231 Subscribers
Convert integers between any numeral systems with exact big-integer math. Pass a number and a from/to base (radix 2 to 36, arbitrarily large, signed) and the convert endpoint returns the result and the decimal value; common 0x, 0b and 0o prefixes are accepted when they match the base, and whitespace or underscores in the input are ignored. The bases endpoint shows a single number across binary, octal, decimal, hexadecimal, base32 and base36 at once, together with its bit length, byte length and sign. Everything is computed locally with BigInt, so values of any size are exact and deterministic. Ideal for low-level and embedded debugging, networking and bit-twiddling work, teaching number systems, and anywhere you juggle hex, binary and decimal. A numeral-base converter — distinct from the text-encoding toolkit (encoding: base64/base32/hex of bytes), the Elixir/Erlang Hex package registry (hex) and number-to-words (numberwords). No upstream key, no cache.
api.oanor.com/baseconvert-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 74 ms
- Server probes · 24h
- Subscribers
- 4,231
- active
- Total calls
- 57
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 2,100 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 2,100 calls/month
- 2 req/sec
- Convert + all-bases view
- No credit card
Starter
€6.20 /month
- 40,500 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 40.5k calls/month
- 8 req/sec
- Radix 2-36, BigInt
- Email support
Pro
€20.30 /month
- 214,000 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 214k calls/month
- 20 req/sec
- Embedded & tooling pipelines
- Priority support
Mega
€52.80 /month
- 815,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 815k calls/month
- 50 req/sec
- Dev-platform scale
- Dedicated SLA
Built by
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api.oanor.com/number-api
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api.oanor.com/radixvalidators-api
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api.oanor.com/hexdump-api
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api.oanor.com/hex-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Number Base Converter API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Number Base Converter API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Number Base 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 Number Base Converter API cost?
Number Base Converter API has a free tier with 100 calls / month. Paid plans start at €6.20 / 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 Number Base Converter API GDPR-compliant?
All requests to Number Base 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/baseconvert-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/baseconvert-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/baseconvert-api/SOME_PATH");
curl_setopt($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/baseconvert-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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