A former Ripple developer has reignited debate by asserting that the XRP Ledger addressed decentralized exchange order book challenges years before a new Solana project proposed a similar solution. Matt Hamilton responded to discussions about Mato, a Solana-based DEX concept unveiled at Solana Summit Germany by founder Thomas Gehrmann, which aims to eliminate front-running and order sequencing manipulation through a continuous clearing auction that processes trades in parallel rather than sequentially. Hamilton argued that the XRP Ledger had already resolved these market structure issues with its built-in DEX, which launched in 2012 and is often cited as the first decentralized exchange. He expressed frustration that other blockchains continue to reinvent solutions that XRPL had implemented long ago, suggesting this pattern hinders industry progress. The XRP Ledger’s native order book DEX allows direct trading of XRP and issued tokens without relying on smart contracts, operating continuously for over a decade. Recent developments on XRPL include proposals for native lending vaults and fixed-rate lending through amendments XLS-65 and XLS-66, as well as the addition of StableSwap and concentrated liquidity features via “AMM Swappable Curves” upgrades. Ripple and Bitso also launched the MXNB stablecoin on XRPL, integrating with Ripple’s Payments on DEX infrastructure. While Mato’s continuous auction model differs from XRPL’s order book approach, Hamilton’s commentary highlights how older blockchain designs can resurface as reference points for ongoing innovation.