Swap values for FX are applied in points on ThinkTrader and in percentage terms for MT4 and MT5.
When calculating the FX swap, ThinkMarkets considers the Tom/Next (Tomorrow/Next) interest rates from the interbank forward market of top liquidity Tier-1 banks. The resulting value is taken directly from the liquidity providers, partners of ThinkMarkets.
Rollovers can be positive or negative. The main components forming the Tom/Next interest are based on the interest rates differential between the currencies (part of the pair), liquidity (in this case the liquidity of the forward market can be reduced by upcoming important political events, end of a month, a quarter, or a year), demand for the interbank forward market, uncertainty around currencies and other important events concerning some of the currencies.