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API · /businessdays-api

Business Days API

healthy 4,112 Subscribers

Working-day date math. Count the business days between two dates, add or subtract a number of working days from a date (negative goes backwards), and check whether a given date is a business day — all skipping weekends and any holidays you supply. Configure which days count as the weekend (Saturday/Sunday by default, or e.g. Friday/Saturday) and pass a list of custom holiday dates to exclude. Perfect for SLA and support deadlines, delivery and lead-time estimates, payroll and invoicing periods, and financial settlement dates. Pure local UTC date math — no key, no third-party service, deterministic and instant. Live. 4 endpoints. Distinct from a calendar date toolkit (which counts calendar days) and a holidays directory (which lists holidays).

#business-days #working-days #date #calculator #developer-tools #sla
api.oanor.com/businessdays-api
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Machine-readable spec so AI agents can integrate this API.

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

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

Business Days API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
76 ms
Server probes · 24h
Subscribers
4,112
active
Total calls
84
last 7 days
status Full status page → · 20 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,300 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,300 calls/month
  • 2 req/sec
  • Count / add / classify
  • No credit card
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Starter

€4.80 /month

  • 18,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 18k calls/month
  • 8 req/sec
  • Custom weekend + holidays
  • Email support
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Pro

€24.40 /month

  • 162,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 162k calls/month
  • 20 req/sec
  • SLA / scheduling pipelines
  • Priority support
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Mega

€60.40 /month

  • 830,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 830k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Tip Calculator API

Work out tips and split a bill — with exact cent maths so the per-person amounts always add back up to the total, no penny ever lost to rounding. The calc endpoint takes a bill, a tip percentage (15% by default) and a number of people and returns the tip amount, the grand total, the per-person amount, the effective tip percentage, and — when you want a tidy number — an optional rounding of the total either up to the next whole unit or to the nearest. When the bill does not divide evenly it produces a fair share list where a few people pay one cent more, so the parts sum precisely. The split endpoint divides any amount, optionally adding a tip first, evenly among people and returns that exact per-person share list. Everything is computed in integer cents locally and deterministically, so it is instant, private and always balances. Currency-agnostic — the numbers work for any currency. Ideal for restaurant and POS apps, expense-sharing and group-payment tools, delivery and service apps, and everyday bill splitting. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This calculates tips and splits; for percentage maths in general use a percentage API and for invoicing margins use a margin API.

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Business Days API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Business Days API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Business Days 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 Business Days API cost?
Business Days API has a free tier with 100 calls / month. Paid plans start at €4.80 / 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 Business Days API GDPR-compliant?
All requests to Business Days 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/businessdays-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/businessdays-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/businessdays-api/SOME_PATH");
curl_setopt($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/businessdays-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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