Every crypto exchange runs a two-sided fee schedule. Makers post resting orders that sit in the book and add liquidity; takers cross the spread and remove liquidity. Exchanges reward makers with lower (or even negative) fees because resting depth attracts volume.

Fee tiers usually scale with 30-day volume and sometimes token holdings (e.g., BNB, KCS). Rebates can flip the economics of a strategy entirely.

Maker fee: charged when your limit order is filled while resting
Taker fee: charged when you hit the book with a market or aggressive limit
Rebate: negative maker fee paid to you for adding liquidity
VIP tiers: lower fees as rolling 30-day volume rises

Tier	30d Volume	Maker	Taker
VIP 0	<$50k	0.10%	0.15%
VIP 1	$50k–$500k	0.08%	0.12%
VIP 3	$5M–$20M	0.00%	0.06%
VIP 5	>$100M	-0.01%	0.03%

A high-frequency trader doing $10M/month at VIP 0 pays ~$25k in fees; at VIP 5 the same flow earns a rebate. Fee structure is a first-class variable in spot strategy, not an afterthought.