https://steamlevelup.com/

The commands are as follows:

• !selltf2 [Number of tf2 keys] - Sell Summer Sets for tf2 keys.
• !buytf2 [Number of tf2 keys] - Buy Summer Sets for tf2 keys.

• !stats - Displays the bot's current stats.
• !prices - Displays the current prices.

•!sellcheck - See how many sets the bot can purchase from you.