This market will resolve to "Up" if the "Close" price for the Binance 1 minute candle for ETHUSDT 12 May 00:00 in the ET timezone is lower than the final "Close" price for the 18 May 23:59 ET candle.
This market will resolve to "Down" if the "Close" price for the Binance 1 minute candle for ETHUSDT 12 May 00:00 in the ET timezone is higher than the final "Close" price for the 18 May 23:59 ET candle.
If the final "Close" price for both of these candles is exactly equal on Binance, this market will resolve 50-50.

The resolution source for this market is Binance, specifically the ETHUSDT "Close" prices currently available at https://www.binance.com/en/trade/ETH_USDT with "1m" and "Candles" selected on the top bar.

Please note that this market is about the price according to Binance ETHUSDT, not according to other sources or spot markets.