How your tier is determined
Fees are based on rolling 14-day volume, assessed at the end of each day in UTC. Perps and spot volume are combined to set the tier, with spot counting double: 14-day weighted volume = perps volume + 2 × spot volume. There is a single fee tier per user across all assets, including HIP-3 perps and spot.
Sub-account volume counts toward the master account and all sub-accounts share the same tier — relevant to any system that spreads activity across sub-accounts. Vault volume is treated separately from the master account.