Has given me a free closed beta key for Drone Strike Force instead of the the full game he listed with a price tag of 16,79€ and a link to the full game in the Steam store, it activated as "ODD for Beta Testing".
Free Closed Beta Key Giveaway - https://www.mmorpg.com/giveaways/1000000951
https://barter.vg/i/93495/ ⌫ Revoked or Removed from the libraries of 72 Barter users
It was in return for Sonic Mania Humble Gift Link.
First screenshot shows his trade thread listing it with a price tag of 16,79€ and a link to the official full game Steam store page, second shows it activated as "ODD for Beta Testing":