In Fortress Destroyer, a merchant called Salty will often come to your HQ.
Fd saltyship

You can choose how often he comes at the options menu when at your HQ. You can also summon him directly from that menu. He offers to trade Ninja Kiwi Coins for various packs and deals inside his ship, and allows the exchanging of currencies.

You can exchange for 1,000, 5,000, 25,000, 100,000, or 500,000 of a material at fixed costs from either of the other two materials.

How much exchanging 100 of a material would cost
Buy\Sell Gold Alloy Circuits
Gold - 4 2
Alloy 2750 - 200
Circuits 5500 250 -

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