1. Speed matching is an automatic trading method. The system will automatically match the transactions in the market according to the needs of buyers and sellers. The advantage of this method is high transaction speed, but the disadvantage is low security.

2. Pending orders refer to users posting their trading requirements on the trading platform and waiting for other users to match the transaction. This way is safe, users can choose who to trade with, and can confirm the details and security of the transaction through communication with each other.