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Vercel acquired the open-source authentication platform Better Auth on July 7, 2026, to integrate its Agent Auth protocol and enable AI agents with distinct, secure identities[1][9]. The deal, whose financial terms were not disclosed, brings Better Auth founder Bereket Engida and the core engineering team to Vercel to build AI-focused identity tools while keeping the TypeScript library free, MIT-licensed, and open source[1][2]. This acquisition extends Vercel’s open SDK strategy into authentication, addressing a critical gap in developer infrastructure as AI agents increasingly require their own verified identities to interact safely with applications[1][5]. The community governance and open contribution model for Better Auth will continue unchanged, ensuring existing developers are not forced to migrate while gaining access to Vercel’s platform for enhanced security features like PKCE[2][8].