Bitfinex maker taker?

[coolestturtle]

Bitfinex has now changed their fees and takes different fees from makers and takers. https://www.bitfinex.com/pages/fees

I assumed that a maker is one who adds a bid or ask order which wont get filled by an already open ask or bid order. However today I placed an ask order which had no corresponding bid, but it was charged at the taker fee. Maybe it was filled by a hidden order?

How are we supposed to know with certainty that our order will be a taker or maker order?

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[Himself]

You can't know for certain.   You learn after the trade executes.  CoinMKT operates under maker/taker as does BTCChina.  It's a great way to reward liquidity providers.