Changing the benchmark changes the question you're asking about $ETH .
At 23:50 UTC on October 29, Binance spot showed ETH/USDT down about 5.4% over seven days, while ETH/BTC was down 1.5%. Ethereum had lost ground against both USDT and $BTC , but by different amounts.
The BTC pair helps isolate relative performance between the two assets. It doesn't remove downside: both can fall against USDT while one outperforms the other. These are rolling windows, not calendar-week closes.
At 23:50 UTC on October 29, Binance spot showed ETH/USDT down about 5.4% over seven days, while ETH/BTC was down 1.5%. Ethereum had lost ground against both USDT and $BTC , but by different amounts.
The BTC pair helps isolate relative performance between the two assets. It doesn't remove downside: both can fall against USDT while one outperforms the other. These are rolling windows, not calendar-week closes.