Click on top right of GDAX about fees

HOW ARE FEES PROCESSED?

A 0.25% taker fee for all BTC books and 0.30% taker fee for all ETH and LTC books is collected on each trade during the day. At the end of the day (UTC 00:00), a rebate is calculated and issued. The amount of the rebate issued is calculated on the percentage of total exchange volume, per product, that a trader has participated in over the past 30 days.

For example, If 100 BTC was traded on Coinbase’s BTC/USD order book in the last thirty days and you accounted for 1.1 bitcoin, you account for more than 1% of the total volume and receive a rebate of 0.01% that day and pay an effective taker fee of 0.24%.

The rebate is issued in the quote currency.

HOW IS EXCHANGE VOLUME CALCULATED?

Volume is defined as the amount of bitcoin that is traded, or “changes hands” on the exchange. For example, if 10 bitcoin is transacted between a maker and taker, then the total exchange volume is 10 bitcoin, and each party will have participated in 100% of trade volume.

MAKER VS. TAKER

When you place an order at the market price that gets filled immediately, you are considered a taker and will pay a fee between 0.10% and 0.25% for BTC books and 0.10% and 0.30% for ETH books.

When you place an order which is not immediately matched by an existing order, that order is placed on the order book. If another customer places an order that matches yours, you are considered the maker and your fee will be 0%.

When you place an order that gets partially matched immediately, you pay a taker fee for that portion. The remainder of the order is placed on the order book and, when matched, is considered a maker order. The fee is 0% for that part of the total order.