An account key reads the /api/x402 catalog on its plan within a monthly ceiling, a history window and a row cap. Builder: 1,000 included catalog calls a month over the last 90 days, up to 5,000 rows a call, summary series only (the raw record routes are paid per call). Business: 10,000 a month over the last 365 days, up to 20,000 rows a call, raw records included. Scale and Enterprise: no ceiling, the whole archive, raw records included. The window counts from 00:00 UTC, and each included call still counts as 10 requests of the plan's monthly fair use. Raw records are the individual liquidation events and the largest-print ranking, whale prints, Hyperliquid position events and hourly position records, order book snapshots, minute bars and per-venue market snapshots. Two new answers, both pay per call: 403 history_window (a from, to or days before the plan's window) and 403 raw_tier_required (a raw record route below Business); x402_allowance_used (HTTP 402) is back for the plan ceiling. To pay per call with an account key in the request, send the account key as Authorization: Bearer with a prepaid key in x-api-key, or send the call without the account key and pay with a wallet. Included answers carry x-history-window-days and x-history-row-cap (neither on liqmap-levels, options-flow and flow-vpin; the latter not on bulk exports), plus x-x402-allowance-limit and x-x402-allowance-used where a ceiling applies; /api/v1/usage adds history_days, rows_per_call and raw_records_included. Wallet and prepaid calls are unchanged: the whole archive at each route's own row cap, $0.10 a call. Plans, API docs.