Exports of chocolate provide you with Crates of Coin from your Home City. You get 1 Crate per 2 minutes of game length.
—In-game description

Aztec Chocolate Recipes is a technology in the vanilla Age of Empires III that can be researched at a Trading Post built on an Aztec settlement. Once researched, it ships 100 coin for every 2 minutes the game have passed, up to 30 minutes (for a total of 1,500 coin).

This technology was replaced by Mapuche Treaty of Quillin in The WarChiefs, which is exactly similar in function.

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