Unlike most of the pairs we offer, XTIUSD and XNGUSD swap rates are similar every weekday.
XTIUSD and XNGUSD swap rates are not 3 times greater on Wednesdays as is the case of FX swaps. You should expect a swap credit / charge in XTIUSD and XNGUSD similar to any other weekday.
However, the MT4 / MT5 specifications require us to set up one day a week with "3-days swap", which is why swap rates for these assets are reflected on Wednesdays as 1/3 of a normal weekday's amount in the table of assets and spreads. The MT4 / MT5 terminal then automatically multiplies the rate 3 times to reflect the correct amount.