Trading Fees

o2 uses a flat trading fee schedule: maker orders pay 0%, and taker orders pay 0.01%. The fee you pay is based on execution behavior, not whether the order is a buy or sell.

A maker order rests on the order book before it fills. A taker order fills immediately against liquidity already on the book.

Fee	Rate	Applies When
Maker	0%	Your order rests on the book and adds liquidity
Taker	0.01%	Your order executes immediately against existing liquidity
Gas	Sponsored	o2 sponsors gas for most trading operations

For current market-specific fee fields, use the market data API and read maker_fee and taker_fee from the market response.

Maker vs Taker

The deciding factor is whether the order enters the order book before it fills.

Your Order	Result	Fee
Market buy or market sell	Taker	0.01%
Limit buy below the best ask	Maker	0%
Limit sell above the best bid	Maker	0%
Limit buy at or above the best ask	Taker	0.01%
Limit sell at or below the best bid	Taker	0.01%

Buy or sell direction does not matter. A resting order is maker; an immediately executing order is taker.

Examples

Maker Order

You place a limit buy that does not match immediately.

Order value: $1,000
Maker fee: 0%
Fee paid: $0.00
Total cost: $1,000.00

Taker Order

You place a market order or a limit order that crosses the spread.

Order value: $1,000
Taker fee: 0.01%
Fee paid: $1,000 x 0.0001 = $0.10
Total cost: $1,000.10

Partial Fills

Fees follow execution behavior:

• The portion that fills immediately is taker and pays 0.01%.
• Any remaining portion that rests on the book becomes maker and pays 0% when later filled.

Quick Takeaways

1. Maker fee is 0%.
2. Taker fee is 0.01%.
3. Market orders are taker orders.
4. Limit orders are maker only when they rest on the book.

o2 vs Other Exchanges

Exchange	Maker Fee	Taker Fee	Gas Fees
o2 Exchange	0%	0.01%	Sponsored
Uniswap V3	0.01-1.00%	0.01-1.00%	User pays
Hyperliquid	0.00-0.01%	0.025-0.035%	User pays