Suppose I place a sell order for 1 btc at $45k on your favourite exchange. Next, I place a buy order for 2 btc at 46k, will the exchange execute the trade?
First of all, I don't know why someone would sell 1 BTC for $45k and later buy them for $46k. The orders might and might not get filled based on the market price and movement. The exchange doesn't take it upon itself to sell/buy your coins. You are basically trading with other people on a large scale. You need to understand some facts.
- Market price of a coin is determined by what value it was last traded for (sell or buy)
- Orders you place are filled when that "market price" is reached
If you meant buying at 45k and selling for 46k then it is a good strategy but the market might not move up after you buy at 45k for a while. Those are the tiny risks associated with day trading.