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Open-interest caps
Limits on how much may be held open in one market, or on one exchange.
Each builder exchange caps every market's open interest in dollars, and its total across markets (Hyperliquid's documentation: notional, position size times mark price). The main exchange has caps too but does not publish them; it lists the markets that have reached theirs.
Cap use is open interest against the cap: how close a market is to its limit.
On 2026-10-04 the fullest builder market was io:ANTH, at 85% of its cap; xyz had used 38.6% of its $10bn exchange-wide cap.
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The builder-exchange markets closest to their cap right now.