Market order
In short
A market order buys or sells immediately at the best available price. Execution is guaranteed — the price is not: in thin markets you slide down the book (slippage).
Market orders pay "taker" fees and get expensive for large size in illiquid coins. Rule of thumb: market only when speed matters more than price.
Why did I get a worse price than displayed?
The displayed price covers only the top book level — your order consumed deeper, worse levels.
Related terms
Information, not investment advice. More of this? The newsletter.