This is an idea from Warframe:
Any and all trades have an extra tax/fee applied to them, propotional to the total cost of the items being traded and the amount of WP being traded.
WP tax scales linerally at a 5% rate (so a 1 million WP trade would require the recipient to pay a 50,000 WP trading tax. A 10 million trade value would require a tax of 500,00, etc.)
Tax on the item scales on its rarity and dealer cost.
White: 1%
Green: 2%
Yellow: 3%
Purple: 5%
Blue: 10%
Orange: 15%
Parts follow the rarity of the final vehicle, and each complete vehicle is assumed to cost:
White: 2000 WP
Green: 5000 WP
Yellow: 10,000 WP
Purple: 30,000 WP
Blue: 75,000 WP
Orange: 150,000 WP
Tax per part is the dealer price of the vehicle divided by number of parts. I.E:
An AN-225 trade involving 1 part of 10 total would have a 15% tax applied to the parts dealer price of 15,000 WP, making the final tax 2250.
A full SR-71 would cost 22500 WP in tax to trade.
Epic Status is not considered for this transaction, only base rarity.
Any Taxed WP is voided and disappears from the market.

















