Rialto has launched an on-chain spot exchange, enabling trading of crypto assets, stocks, ETFs, commodities, and Pre-IPO assets. The platform, powered by PropAMM, collaborates with Robinhood Crypto, Offchain, and Arbitrum to offer deep liquidity on the Robinhood Chain. Initially, over 90 Robinhood stock tokens and major cryptocurrencies are listed. Rialto's proprietary PropAMM "Rivo Altus" ensures baseline liquidity, while connecting with market makers and institutional liquidity providers. With 100-millisecond block times and Ethereum composability, Rialto aims to match centralized exchanges in trade execution quality, fostering a programmable economy trading environment.