With access to your Steam accounts API key, scammers are able to freely create and decline trades. If you fear someone may have access to your API key, revoke your steam web API key immediately: https://steamcommunity.com/dev/apikey
If there is no API key registered to your account, you are safe. For ordinary Steam users, the API key has no real use so it is good to keep disabled unless otherwise required.
We have designed Skinsauna.gg to be the easiest, safest and fastest way to sell skins. For example, our system scans for API-scams in real-time to ensure our customers never become victims. If an API scam is detected on your account, we will instantly inform you of the threat and guide you through the API key removal process. API scams are a big issue in the skins community, except when selling on skinsauna.gg :)
Hopefully you found this article useful!