Once you are invited to a playtest, you will find information about the compensation in the project’s description. Each playtest compensation varies based on developer preferences. Generally, rewards include Experience Points (XP) and Antidote Coins, though sometimes the full playtested game or entry into a giveaway is offered.
Antidote Coins can be traded for various game-related rewards, such as games, gift cards (e.g., for Steam, Amazon), game event tickets, consoles and much more. More details about the Antidote Reward system are available here.
If the full game is the reward, you will either retain ownership of the game you tested or receive it upon its release. Notification will be provided when the released game becomes available.
Occasionally, playtests feature a lucky draw for high-value prizes, including high-end PCs, consoles like Steamdecks, or Steam gift cards.