Direct currencies’: same as in ‘Dollar size’ 

Crosses:  same as in ‘Dollar size’

“Indirect Currencies”:

Valid only for USDJPY; USDCHF; USDCAD

Transactions in ‘second currency’ in the pair

‘Contract sizes’  in ‘second currency’ in the pair

Customer Buy ‘second currency’ in the pair @Bid, Sell @Ask 

Example1

USDJPY

‘Lot’ in yen. Ex.: 12,500,000 yen

Customer Buy JPY @Bid, Sell @Ask

129.10/20

Customer Buy JPY @10, Sell @20

P/L calc.:

(1/sell price) – (1/buy price) x ‘lot size’ x # of lots

Example1.1: 

Quote 129.10/20. Open sell yen at 20. 1 lot. Hoping to go ^.

Quote 129.30/40. Liquidation: Close buy yen at 30. Gain 10 pips.

Profit: (1/129.20 – 1/129.30) x 12,500,00 x 1 lot.

1/129.20 > 1/129.30, so we are in profit.

Result is in dollars, as you see.