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The A.N.G.L.R. Exchange NPC is a vendor who can be found on all Fishing Islands, as well as in the Fishing building to the left of spawn on the Main Island.
The A.N.G.L.R. Exchange will trade its stock for 
Coins on the Main Island, and 
A.N.G.L.R. Tokens on the Fishing Islands. However, each item can only be bought 10 times. Each time an item is bought, the price increases. The NPC's stock is the same in all islands, and refreshes every Tuesday at 10 AM UTC.
Stock in this vendor can vary per rotation, but usually consists of Treasure Chests, Quest Scrolls, Cosmetic Crates, and Chroma Packs. A full table showing all possible items sold can be found below:
TBA