Guild Wars 2

Hi ! I saw this site on flippable items http://www.gw2tp.net/
I got my gw2 api key, made a transaction and 5 minute later realised that this could be illegal. So i immediatly deleted the transactions and all the gw2 api keys.

My intention is not to break any Rule, so i’m asking : can this get me banned, or is it legal?

Since its using the GW2 api, of course its perfectly legal. Anet made the api so that this can be done.

Now, why on earth Anet would to expose features that make automated tp flipping from outside the game possible is beyond me.

Hm, that’s kinda dodgy, if you look at the EULA under Article 8 “PROHIBITED AND IRREPARABLY HARMFUL ACTIVITIES CONCERNING ArenaNet”, Section i, Clause 4:

You acknowledge that You may not, without signed written consent from a legally authorized representative of ArenaNet, do any of the following:

Use, obtain or provide data related to operation of the Game, including but not limited to:

software not provided by ArenaNet which creates or maintains any communication to the Game or Service, including but not limited to any software that emulates the Game or any part thereof as well as any server that emulates the Service or any part thereof;

While I imagine they mean “don’t make a custom client that you can cheat with”, using a site that’s running software which emulates part of the game client’s function (because you should only be able to buy and sell while in the game) would run afoul of this unless said site has written permission to do so (which, from cursory inspection, they don’t say if they do or not).

On the up side they don’t offer automated trading, which would have been instant hot water for you; on the down side they have a premium membership, so I don’t know how kosher it is with ANet for a “fan” site to make money off a service for their IP.

How exactly did you made a transaction using this website?
The api is read only as far as I know. It is not possible to make any transactions outside of the game.
All this website seems to allow you to do is create a log of things you want to buy.
You will still need to do the transactions in game.
Perfectly legal.