Ripple said it has launched the XRPL AI Starter Kit for developers building AI agent payment applications on XRP Ledger, with an initial Phase 1 focused on discovering, learning and building agent apps. The toolkit supports same-day x402-based payments settled in XRP or Ripple USD (RLUSD), and Ripple said XRPL now supports the open x402 payment standard built around HTTP 402 through a contribution from t54. The launch comes as stablecoin liquidity on XRPL nears the $1 billion mark: DeFiLlama shows about $770 million in stablecoin supply on XRPL, up roughly 97% over 30 days, while RWA.xyz estimates about $901.7 million and 30-day transfer volume of $4.95 billion, up 122%. Both datasets indicate RLUSD is driving nearly all of the recent growth, with DeFiLlama showing RLUSD at about $761.7 million, or nearly 99% of XRPL stablecoin supply.