Get Builder Leaderboard

Ranked list of builders over the window.

Defaults to ranking by attributed volume; sort_by=fee ranks by builder_fee_usd instead (more useful when looking at revenue-earning builders, since the highest-volume builders often charge 0 bps).

builder_fee_usd is computed at the rate in force when each fill happened (ASOF against builder_fee_rates), not today's rate. current_taker_bps/current_maker_bps surface today's rate for display. Excludes V1 fills, zero-sentinel builders, and rows with sign != 1.