Rialto emerged from stealth and launched its onchain spot exchange on Robinhood Chain, introducing a proprietary proactive automated market maker (PropAMM) model to support the trading of tokenized equities, ETFs, commodities, and digital assets. Built in collaboration Offchain and Arbitrum, the exchange features the "Rivo Altus" PropAMM engine, which is designed to provide liquidity across all listed markets while routing institutional order flow.

The venue aims to bridge the execution gap between decentralized and centralized trading environments. Rialto is deploying logic directly onchain using Arbitrum's Stylus infrastructure to support active book construction, inventory management, and defensive quoting. Its architecture allows market makers to quote tighter spreads on permissionless infrastructure, drawing comparison to the automated routing and execution principles of Reg NMS in traditional equities.

The initial rollout includes trading support for major crypto assets alongside more than 90 Robinhood Stock Tokens. Because the underlying assets are deployed as programmable tokens on Robinhood Chain, they remain fully composable across the broader DeFi ecosystem, enabling 24/7 trading, real-time index streaming, and support as collateral on lending markets.

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