Spot vs futures
Holding a coin for weeks: buying it outright against a 1× long perpetual, with fees and funding.
Exchange
USDT
%
%
Result
Spot: buy + sell fees20.00
Perpetual: fees12.00
Perpetual: funding–
Perpetual: total–
Cheaper–
Bitunix does not state its funding interval for BTC, so funding over days is not computed.
A 1× long perpetual against buying the coin. Funding is Bitunix's current rate (+0.4277 %) carried forward.
When the perpetual costs more
Spot costs a fee to buy and a fee to sell, and nothing in between. A perpetual usually has lower trading fees but pays or receives funding every interval. When funding is positive for long, a long held for weeks often costs more than spot; when it turns negative, the long is paid to hold.