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Book depth and cost to trade
How much is resting near the price, and what a larger order would pay.
The order book lists the orders waiting to be filled. Depth is their value within a band around the mid price; cost to trade is how far the average fill of a market order of a given size lands from the mid.
Hyperliquid sends the 20 nearest levels on each side live; further out its books come grouped into price buckets, which give bounds only: depth "at least", cost "at most".
Measured 2026-10-04: a $1M market buy of BTC filled about 0.6 basis points from the mid; of NVDA on xyz, at most 13.5.
Live
The perp with the most open interest right now: depth and cost to trade, live.