One coin's FREE crypto read, the same data the free coin page serves: per-venue funding (rate + annualized, never blended), per-venue open interest and 24h volume, total OI, 24h long/short liquidations, and the free BTC/ETH gamma summary where the coin has one. The response's paid key names what the $79 Crypto Market Map withholds from this feed — gamma by strike, the flip and walls, the block tape, the on-chain map — so never report a gated field as zero or missing; it is withheld, not absent. A coin outside the mapped set answers 200 with covered:false and says what the paid map covers — a non-200 means the request itself failed, never a coverage verdict.