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The API serves two markets. Which one a request belongs to is decided by the coin in the path, and the {exchange} must match it. Call /exchanges and /coins for the live lists. Both return a markets field with the split by market. They are free and not counted against your quota.
Each market is a separate entitlement on your plan. A request for a coin from a market your plan does not include returns 403 market_not_in_plan with markets_in_plan. Call /me to see yours.

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Crypto venues

bybit, deribit, okx and derive are single venues. all (or combined) merges every venue that is currently available for the coin.

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Subsets

Join venues with + to merge just those, for example deribit+derive. Order and duplicates do not matter: the response reports the canonical form in meta.exchange_resolved (here deribit+derive).

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TradFi

TradFi tickers have a single venue, tradfi. For a TradFi ticker all and combined are aliases of tradfi, so older calls such as all/SPY keep working; meta.exchange_resolved is always "tradfi".
Mixing the two sides is rejected with a hint: See Errors for the full catalog.

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Historical data

History is stored per single venue (bybit, deribit, okx, derive), for combined (all crypto venues merged) and for tradfi. As for live data, all and combined with a TradFi ticker resolve to tradfi. Venue subsets such as deribit+derive have no history and return 400 history_not_available with valid_exchanges. Session dates follow the market: the UTC date for crypto, the New York trading date for TradFi. See Historical data.

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Expiration cutoffs

An expiration is listed until its settlement cutoff (plus a one-hour grace period), and its expirations_detail entry reports the cutoff as cutoff_utc. A same-day expiration is flagged is_0dte: true in /expirations. Expiration path parameters accept the code (17OCT26), the ISO date (2026-10-17) or TOTAL.

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Freshness

Every data response says how fresh it is in meta: as_of, oi_as_of, data_source, is_live, market_open and next_open. For TradFi, open interest is published once a day, so during a session oi_as_of is the previous trading day while spot and the gamma profile are live. Crypto is live and always reports market_open: true. See the data dictionary.