Describe a recurrence rule
API · /rrule-api
Recurrence Rule API
healthy
4,012 Subscribers
Expand and describe RFC 5545 recurrence rules — the RRULE that powers calendar repeats. The expand endpoint takes an RRULE and a start date-time and returns the next occurrence dates, correctly handling FREQ (daily, weekly, monthly, yearly and the finer hourly/minutely/secondly), INTERVAL (every 2 weeks…), COUNT and UNTIL, BYDAY including ordinals like 2MO or -1FR (so "the last Friday of the month" or "the third Sunday of June"), BYMONTHDAY including negatives (-1 for the last day of the month), BYMONTH and WKST. The describe endpoint turns a rule into a plain-English sentence such as "every week on Monday, Wednesday and Friday, 10 times". Everything is computed locally in UTC and deterministically, so it is instant, private and identical on every machine. Ideal for scheduling and booking systems, calendar and reminder apps, billing and subscription cycles, job and report scheduling, and showing customers when something next happens. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This expands the recurrence rule; to build a downloadable .ics calendar event use an iCalendar API, and for plain date arithmetic use a date-time API.
api.oanor.com/rrule-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 76 ms
- Server probes · 24h
- Subscribers
- 4,012
- active
- Total calls
- 60
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 3,835 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 3,835 calls/month
- 2 req/sec
- Expand + describe
- No credit card
Starter
€5.35 /month
- 13,350 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 13.35k calls/month
- 8 req/sec
- BYDAY ordinals + UNTIL/COUNT
- Email support
Pro
€25.25 /month
- 184,500 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 184.5k calls/month
- 20 req/sec
- Scheduling / billing / calendar pipelines
- Priority support
Mega
€63.25 /month
- 965,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 965k calls/month
- 50 req/sec
- Platform scale
- Dedicated SLA
Built by
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The calendar patterns equity traders position around — "Sell in May", the Santa Claus rally, the September swoon — computed live from ~10 years of Yahoo Finance monthly data across the world's major stock indices (no key, nothing stored). Equities have well-documented seasonal tendencies, and this measures them directly: for each index it takes a decade of monthly returns, groups them by calendar month, and returns the average return in each of the twelve months, the share of years that month was positive (the win rate), and the historically strongest and weakest months. The seasonality endpoint returns one index's full 12-month seasonal profile plus the current month's historical bias. The month endpoint flips it around: for a calendar month it ranks every index by its historical average return, so you can see which markets are seasonally strong or weak right now. The indices endpoint lists what is covered, from the S&P 500, Nasdaq, Dow and Russell to the DAX, FTSE, CAC, Euro Stoxx, Nikkei and Hang Seng. The equity-index seasonality / calendar-pattern cut — distinct from the FX, commodity and crypto seasonality APIs, the index price feed and the constituent APIs.
api.oanor.com/indexseasonality-api
Commodity Seasonality API
The calendar patterns commodity traders position around, computed live from ~10 years of Yahoo Finance monthly futures data (no key, nothing stored). Commodities are the most seasonal market there is: natural gas tends to rally into winter heating demand, gasoline into the summer driving season, grains around the planting and harvest calendar. This measures it directly — for each commodity it takes a decade of monthly returns, groups them by calendar month, and returns the average return in each of the twelve months, the share of years that month was positive (the win rate), and the historically strongest and weakest months. The seasonality endpoint returns one commodity's full 12-month seasonal profile plus the current month's historical bias. The month endpoint flips it around: for a given calendar month it ranks every commodity by its historical average return, so you can see what is seasonally bullish or bearish right now. The commodities endpoint lists what is covered. The commodity-seasonality / calendar-pattern cut — distinct from the FX-seasonality API (currencies), the commodity-price feed, the commodity-spreads and the commodity-momentum APIs. It answers what a commodity usually does this month, not what it costs today.
api.oanor.com/commodityseasonality-api
Crypto Project Team & Events API
The "who built it and what is on its calendar" view of a cryptocurrency, served from the public CoinPaprika feed. The coin endpoint returns the project's identity and technical profile — market-cap rank, coin-or-token type, whether it is active, the genesis date, development status, consensus / proof type, hashing algorithm, organisation structure, the open-source flag and its industry tags. The team endpoint returns the people behind the project — names and roles such as founders, authors and leads. The events endpoint returns the project's event calendar — conferences, mainnet launches, exchange listings and milestones, each with a date and a link, newest first. This is the project-and-people view of a coin — its team, profile and calendar, not its price — distinct from the price-feed, market and CoinGecko-profile APIs in the catalogue. A coin is a CoinPaprika id (btc-bitcoin); a bare symbol (btc) or name (bitcoin) is resolved automatically to the best-ranked match. Live, no key on the upstream, nothing stored.
api.oanor.com/cryptoprojects-api
Earnings & Stock Splits Calendar API
Live US corporate-events calendar from Nasdaq — no key, nothing stored. The earnings and stock-splits calendar: which companies report earnings on a given day and which stocks are about to split, distinct from the economic-calendar, IPO-calendar and dividend APIs in the catalogue. The earnings endpoint returns every company reporting on a date — ticker, name, the consensus EPS forecast, the reporting time (before market open or after market close), market cap, the number of analyst estimates, the fiscal quarter ending and the prior-year EPS and report date — ranked by market cap. The splits endpoint returns the upcoming stock splits: ticker, name, the split ratio and the execution date. Build earnings-season dashboards, event-driven trading bots, investor-relations trackers and "who reports today" widgets on top of real Nasdaq calendar data. The earnings endpoint defaults to today (US Eastern) and accepts any date; EPS and market cap come back as clean numbers and reporting time is normalised to pre-market, after-hours or unspecified.
api.oanor.com/earnings-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Recurrence Rule API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Recurrence Rule API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Recurrence Rule 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 Recurrence Rule API cost?
Recurrence Rule API has a free tier with 100 calls / month. Paid plans start at €5.35 / 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 Recurrence Rule API GDPR-compliant?
All requests to Recurrence Rule 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/rrule-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/rrule-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/rrule-api/SOME_PATH");
curl_setopt($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/rrule-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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