Raydium
Introduced on February 21, 2021, Raydium is an automated market maker exchange and liquidity provider based on Solana that fuels the Solana DeFi ecosystem. Raydium utilizes liquidity from Serum, another decentralized exchange on Solana, and benefits from its central order book system that resembles conventional exchanges. This enables extremely quick, low-cost trading of digital assets on Solana, ensuring the dependability of an order book system.