OpenKitx403 is the first full HTTP-native wallet authentication protocol on Solana. It standardizes wallet-based identity using the 403 challenge → sign → verify flow, allowing apps to authenticate users without centralized services or PII leakage. The protocol comes with TypeScript & Python SDKs, LangChain support, bot integrations, and a growing ecosystem of live projects including WalletBox, OpenGuard, AutoIncentive, AgarFi, and Velocity. The new community is actively maintaining the project, expanding documentation, shipping SDK upgrades, and onboarding developers building tools, dashboards, bots, and token-gated apps using the x402/x403 stack. $K403 is the utility & governance layer supporting protocol development, open-source tooling, and community-driven upgrades.