Butterbase
An open-source, AI-native backend-as-a-service combining a Postgres data plane, auth, storage, serverless functions, an AI/LLM gateway and a built-in MCP server so agents can operate the backend with tools instead of glue code.
Butterbase is an open-source backend-as-a-service aimed at AI-driven applications, built around a Postgres data plane with row-level security, automatic REST endpoints and migrations. It adds a key-value store with TTL and audit trail, S3/R2-backed file storage with presigned URLs, TypeScript serverless functions on the Deno runtime, stateful per-key durable objects for things like chat rooms or rate limiters, WebSocket realtime subscriptions, and edge server-side rendering and static hosting for frameworks such as Next.js, Remix or Astro.
Its AI-specific features include a single gateway endpoint for chat and embeddings across model providers, managed retrieval-augmented generation with document ingestion and semantic search, third-party tool access through Composio, and a built-in Model Context Protocol server that exposes the platform's capabilities as tools an agent can call directly instead of writing custom integration code. Identity features cover email and OAuth sign-in, JWT configuration, post-login hooks, structured audit logs and outbound webhooks.
It is written in TypeScript and licensed under Apache-2.0.