{"openapi":"3.1.0","info":{"title":"Crypto Options Put/Call Ratio & Sentiment API","version":"1.0.0","description":"The single headline gauge of how the crypto options market is positioned, computed live from Deribit's public option book — no key, nothing stored. The put/call ratio is the amount of put activity divided by call activity: a low ratio means the market is loaded with calls (bullish, greedy positioning), a high ratio means puts dominate (hedging, fear). The ratio endpoint returns, for a currency (BTC or ETH), the market-wide put/call ratio computed two ways — by open interest (the standing positioning) and by 24-hour volume (today's flow) — with the call and put totals, the spot index and a plain-language sentiment label. The expiries endpoint breaks the put/call ratio down by expiry, revealing the term structure of sentiment: whether hedging is concentrated in the near term or further out. This is the aggregate options put/call sentiment cut for crypto — distinct from the US-equity put/call API (a different market), the max-pain / open-interest positioning view, the implied-vol skew surface and the gamma-exposure APIs in the catalogue. Below roughly 0.7 is call-heavy and bullish, above 1.0 put-heavy and defensive; it is most useful read as a contrarian gauge. Currency is BTC or ETH, the two assets Deribit lists liquid options for.","contact":{"name":"PremiumApi","url":"https://www.oanor.com/by/premiumapi"}},"servers":[{"url":"https://api.oanor.com/cryptoputcall-api","description":"oanor gateway"}],"tags":[{"name":"Put/Call"},{"name":"Meta"}],"components":{"securitySchemes":{"oanorKey":{"type":"apiKey","in":"header","name":"x-oanor-key","description":"Get your key at https://www.oanor.com/developer/keys"}}},"security":[{"oanorKey":[]}],"paths":{"/v1/expiries":{"get":{"operationId":"get_v1_expiries","tags":["Put/Call"],"summary":"Put/call ratio by expiry (term structure)","description":"","parameters":[{"name":"currency","in":"query","required":true,"description":"BTC or ETH","schema":{"type":"string"},"example":"BTC"}],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK"},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}},"/v1/ratio":{"get":{"operationId":"get_v1_ratio","tags":["Put/Call"],"summary":"Market-wide put/call ratio & sentiment","description":"","parameters":[{"name":"currency","in":"query","required":true,"description":"BTC or ETH","schema":{"type":"string"},"example":"BTC"}],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK"},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}},"/v1/meta":{"get":{"operationId":"get_v1_meta","tags":["Meta"],"summary":"Spec","description":"","parameters":[],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK"},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}}},"x-oanor-pricing":[{"slug":"free","name":"Free","price_cents_month":0,"monthly_call_quota":500,"rps_limit":2,"hard_limit":true},{"slug":"starter","name":"Starter","price_cents_month":1144,"monthly_call_quota":11400,"rps_limit":6,"hard_limit":true},{"slug":"pro","name":"Pro","price_cents_month":3466,"monthly_call_quota":68000,"rps_limit":16,"hard_limit":true},{"slug":"business","name":"Business","price_cents_month":7840,"monthly_call_quota":360000,"rps_limit":40,"hard_limit":true}],"x-oanor-marketplace-url":"https://www.oanor.com/api/cryptoputcall-api"}