If you don't want to change trade, you can at least make sure that the trade API is FAIR

...and doesn't serve data to other apps sooner than it does to your site.

Do I need to have my own app to play this game fairly?

Flippers see items much sooner than they appear on the official POE trade. As a result the market is terrible for the rest, filled with price fixing and practically rendering live searching useless for the items targeted by flippers.

If you don't want to change trade, I think you should at least make sure it's not a total disaster. Thank you.