Why ETHBTC in Futures UM directory?

Hi,

In
https://data.binance.vision/?prefix=data/futures/um/monthly/aggTrades/
I would understand we have only pairs with USD-related quote.

But there is this ETHBTC pair present as well:
https://data.binance.vision/?prefix=data/futures/um/monthly/aggTrades/ETHBTC/

Is this normal?

Thanks for the feedback,
Best regards,