What is Maker fee?

A maker fee is charged on a trading account when your order adds liquidity to the order book by setting a price rather than taking one. On a standard trading account the maker fee is 0% at ActivTrades, 0.111% at Ajaib, 0% to 0.15% at Alpaca, 0.15% at Anycoin Direct and 0.1% at AscendEX. Alpaca's figure is a range, so the same account can sit at either end depending on the tier it qualifies for. Market orders and volatile pairs are where taker fees pull ahead instead.