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Builder codes
How the app you trade through can add its own fee, and how much at most.
A builder is an app or front-end that sends orders to Hyperliquid for its users. With a builder code it can charge its own fee on each fill it sends, on top of the exchange's fee.
The user first approves a maximum fee for that builder, signed by their main wallet, not an API wallet. The builder fee can be at most 0.1% on perps and 1% on spot. Builders collect it the way referral rewards are collected, and need at least 100 USDC in their perps account (Hyperliquid's documentation, read 2026-10-05).
So the same trade can cost different amounts depending on the app it is placed through.
Live
On a $10,000 market order: the exchange's base fee now, and the most a builder may add.