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by cmartel 4049 days ago
In Guild Wars 2's case, there's a significant portion of the API made available to the public, including the trading post. https://wiki.guildwars2.com/wiki/API:Main

I don't believe this includes "write" operations like buying or selling, but since the in-game trading post communicates through the same web-based, it probably wouldn't be too much of a stretch to piece it together.