Frat....it differs from borkerage to brokerage....for ex at MG they have a flat 5 pip spread across the board ALL the time....last time I checked in w/them....it's been awihile tho so it could have changed some.
@ Oanda.....their spreads move w/mrkt liquidity.....the more a pair is being traded, the lower the spread....so on Fri's as the mrkt draws to its' weekly close & liquiduty begins to dry up, the spreads begin to reflect that & thus you will see them increasing right into the close.
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