IV skew: risk reversal & butterfly
API · /optionsskew-api
Crypto Options IV Skew & Term Structure API
healthy
3,008 Subscribers
The shape of the crypto implied-volatility surface, computed live from Deribit's public option book — no key, nothing stored. A single at-the-money number hides what the options market is really saying. The skew endpoint returns, for a currency (BTC, ETH, SOL, XRP) and expiry, the ATM implied vol, the implied vols of an out-of-the-money put and call at a chosen moneyness, the risk reversal (call IV minus put IV — positive means calls are bid and upside is favoured, negative means puts are bid and the market is paying up for downside protection) and the butterfly (the average of the wings minus ATM — how convex the smile is). The termstructure endpoint returns the ATM implied vol for every listed expiry, so you see whether near-dated vol sits above far-dated (backwardation, stress) or below (contango, the calm default). The smile endpoint returns the full implied-vol-by-strike curve for one expiry — the classic volatility smile. This is the volatility-surface analytics cut for crypto — distinct from the raw per-contract option chain, the max-pain / open-interest positioning view, the realised-volatility series and the US-equity put/call APIs in the catalogue. Currency is BTC, ETH, SOL or XRP; expiry is a Deribit code like 26JUN26 (omit for the nearest).
api.oanor.com/optionsskew-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 150 ms
- Server probes · 24h
- Subscribers
- 3,008
- active
- Total calls
- 4
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 350 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 350 calls/month
- 2 req/sec
- Skew + term structure + smile
- No credit card
Starter
€12.94 /month
- 10,500 calls / month
- 6 requests / second
- Hard cap (429 above quota, no overage)
- 10,500 calls/month
- 6 req/sec
- All four currencies
- Email support
Pro
€38.88 /month
- 62,000 calls / month
- 16 requests / second
- Hard cap (429 above quota, no overage)
- 62,000 calls/month
- 16 req/sec
- Vol-surface dashboards
- Priority support
Business
€89.30 /month
- 330,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- 330,000 calls/month
- 40 req/sec
- Vol-trading desk scale
- Dedicated SLA
Built by
Related APIs
Other APIs with overlapping tags.
Crypto Options Gamma Exposure (GEX) API
Where option-dealer hedging flows concentrate, and whether they damp or amplify price moves — computed live from Deribit's public option book, no key, nothing stored. Each open option carries gamma; when dealers are net long gamma they hedge against the move (buy dips, sell rips) and volatility is suppressed, and when they are net short gamma they hedge with the move and volatility is amplified. The gex endpoint aggregates Black-Scholes gamma across every listed expiry, weighted by open interest, into the net dealer gamma exposure (in dollars per 1% move), the call and put gamma split, the zero-gamma flip level — the spot price at which net GEX crosses zero, the boundary between the mean-reverting (positive-gamma) and trending (negative-gamma) regimes — where spot sits relative to it, and the strikes holding the most gamma (the pinning magnets and acceleration zones). The profile endpoint returns GEX by strike, across all expiries or one. The expiries endpoint returns net GEX per listed expiry. This is the dealer-gamma / GEX analytics cut for crypto — distinct from the max-pain / open-interest positioning view, the implied-vol skew surface, the raw option chain and the single-option Black-Scholes pricer in the catalogue. GEX uses the SpotGamma convention (dealers long calls / short puts, r=0) and Black-Scholes gamma from mark IV — a model estimate of positioning, documented as such, not exchange-reported dealer inventory. Currency is BTC, ETH, SOL or XRP.
api.oanor.com/gex-api
Crypto Options Max Pain & Open Interest API
Where the crypto options market is positioned, and the strike toward which an expiry's open interest exerts the most "pain" — computed live from Deribit's public option book, no key, nothing stored. Max pain is the strike at which the total value of all open options is lowest at expiry: the price at which the greatest dollar amount of option open interest expires worthless and option writers keep the most premium. Traders watch it because price often gravitates toward max pain into a large expiry. The maxpain endpoint takes a currency (BTC, ETH, SOL, XRP) and an expiry and returns the max-pain strike, the spot/underlying, how far spot sits from max pain, and the call and put open-interest totals with the put/call OI ratio. The oi endpoint returns the full open-interest-by-strike distribution for an expiry — which strikes hold the most open interest, the magnets and walls (support & resistance) traders watch. The expiries endpoint lists every listed expiry with its aggregate open interest, contract count and call/put split. This is the aggregate options-positioning / max-pain analytics cut for crypto — distinct from the raw per-contract option chain (greeks/IV), from US equity options and from the crypto-volatility APIs in the catalogue. Currency is BTC, ETH, SOL or XRP; expiry is a Deribit code like 26JUN26.
api.oanor.com/maxpain-api
Put/Call Ratio & Options Sentiment API
Live (15-minute delayed) options put/call sentiment analytics for US stocks and indices, computed from CBOE's public delayed-quotes feed. The ratio endpoint aggregates the entire option chain into the headline sentiment gauges — the put/call ratio by volume and by open interest, the total put and call volume and open interest, the contract counts, and the underlying price with its 30-day implied volatility (IV30) — plus a plain-language sentiment lean. The expiries endpoint breaks the put/call ratio down by expiration date, giving the term structure of sentiment. The strikes endpoint maps call-versus-put volume and open interest across strikes for an expiration, showing where positioning sits. This is the computed options-sentiment and positioning view — ratios and skew, not a contract dump — distinct from the raw options-chain, the volatility-index and the options-pricing calculators in the catalogue. US index options use an underscore-prefixed symbol (_SPX, _VIX); a ratio above 1 means more puts than calls (defensive/bearish lean). Live, no key on the upstream, nothing stored.
api.oanor.com/putcallratio-api
Stock Options Chain API
Live (15-minute delayed) US equity and index options chains, served from CBOE's public delayed-quotes feed. For any optionable ticker the summary endpoint returns the underlying quote — current price, day change, open/high/low/close, volume, bid/ask and the 30-day implied volatility (IV30) with its change. The expirations endpoint lists every available expiration date with its call and put contract counts. The chain endpoint returns the option contracts themselves: for each strike and expiry it gives the call/put bid, ask, last, implied volatility, open interest, volume and the full greeks — delta, gamma, theta and vega — and can be filtered by expiration date and by call or put. US index options are addressed with an underscore prefix (_SPX, _VIX). This is the single-name equity and index options surface — strikes, expiries, IV and greeks — distinct from the options-pricing calculators, the crypto-options and the FX/rate APIs in the catalogue. Live, no key on the upstream, nothing stored.
api.oanor.com/optionschain-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Crypto Options IV Skew & Term Structure API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Crypto Options IV Skew & Term Structure API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Crypto Options IV Skew & Term Structure 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 Crypto Options IV Skew & Term Structure API cost?
Crypto Options IV Skew & Term Structure API has a free tier with 100 calls / month. Paid plans start at €12.94 / 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 Crypto Options IV Skew & Term Structure API GDPR-compliant?
All requests to Crypto Options IV Skew & Term Structure 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/optionsskew-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/optionsskew-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/optionsskew-api/SOME_PATH");
curl_setopt($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/optionsskew-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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