Spread Markup Fee Clarification

Hey guys,

My question is quite simple I guess and is just to make sure I understand it correctly:

Alpaca says they only take a spread markup fee of 0.1%.

Say I buy 1 BTC at $60.000 and the spread (ask - bid) is $150, then what would the spread markup fee be? 0.1% of the $150, right? And what if I buy 2 BTC, is is then 2 * 0.1% * $150?

It sounds too good to be true, so just making sure.

Thanks in advance,

Pieter