Glossary
Maker / Taker Fees
An order-book fee model: makers (resting limit orders that add liquidity) pay a low or negative fee; takers (orders that hit the book) pay a higher one.
Centralized exchanges and some on-chain order books split fees by which side of liquidity an order is on. A maker places a limit order that sits on the book; a taker submits a market or aggressive limit that immediately matches against existing orders.
The model rewards making (adding liquidity) and charges taking (consuming it). Some venues pay maker rebates — effectively subsidizing depth. AMMs collapse the distinction: every swap is a "taker" against a pool, and LPs (the implicit makers) earn fees proportional to share.