The number you see next to a user is their trust score, it is intended to provide a general idea of the trustworthiness of the other person in your escrow transaction. It is currently calculated as follows1:

• +2 points for every completed escrow as a seller
• +1 point for every completed escrow as a buyer
• -3 points for every dispute the user has lost
• +1 point for every dispute the user has won

This formula is subject to change over time as we fine tune the system.