Lighter, a decentralized exchange and blockchain platform built on Ethereum's Layer 2, has launched its spot trading testnet. The platform's founder, previously the youngest trader at Citadel and creator of the AI social platform Lunchclub, announced the development on X. Lighter recently secured $68 million in funding, led by Founders Fund and Ribbit Capital, with participation from Haun Ventures and Robinhood, valuing the company at $1.5 billion.