Activity score is transparent: 70% normalized log volume plus 30% token diversity, scaled 0 to 100 within this window. It measures how active a wallet was, not how well it traded.
Attribution: the wallet that paid or received the USDG leg. When a Uniswap router sat in between, the transaction sender is used (bounded to 400 lookups per refresh); the rest stay unattributed and are excluded from the leaderboard but counted in token flow.