Butterbase gives AI applications a complete backend they can run themselves, from a dedicated PostgreSQL database for every app to an MCP server that lets agents operate that backend directly. Define schemas declaratively, apply migrations, protect rows with Row-Level Security policies, and call the generated REST endpoints without building a separate data API. Add email and OAuth sign-in with Google, GitHub, Apple, X, and other providers, then tune JWT behavior, post-login hooks, service keys, and API keys for each application. Store files in S3 or R2 compatible object storage with presigned URLs and access controls, and keep regional key-value data with TTLs and an audit trail. Run TypeScript functions on Deno, coordinate chat rooms or rate limiters as durable per-key objects, and stream table changes to live interfaces over WebSocket subscriptions. Route chat and embedding calls through one AI gateway, ingest documents into RAG collections, and build checkpointed agent workflows that can pause for human approval before continuing. Host static frontends and edge handlers, expose webhooks for application events, and manage schemas, storage, functions, realtime channels, and integrations through more than forty MCP tools. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Apache-2.0 licensed.