1k lot
400:1 margin
$2.50 for $1k
But the pip math is lot money * pip digit (.00001) = .10 ?
Your leverage does absolutely nothing to the value of a pip. You can have 1:1 or 1000:1 leverage and the the pip value will remain the same.
All 400:1 leverage says is that for every $400 dollars you trade you have to have $1 dollar in your account to cover the trade.
The size of the lot you are trading AND the type of account it is (micro/mini/standard) determines pip value.
As an estimate the pip values are,
1 standard lot (100 000 units) = $10/pip
0.1 lot (10 000 units) = $1/pip
0.01 lot (1 000 units) = 10 cents/pip.
As ThePhoenix has stated pip value has nothing to do with leverage.
PS The calculation of a pip is a little more complicated than
lot money * pip digit see 301 Moved Permanently