pAPI is a modular micro-framework built on top of FastAPI for composing scalable, tool-oriented APIs. It extends FastAPI’s routing system with native support for modular service architectures, addon discovery, and LLM tooling.

📚 Documentation: Full documentation is currently a work in progress (WIP).
👉 https://efirvida.github.io/pAPI/
🧪 Example addons are available in the extra_addons branch

• 🔌 Plug-and-Play Architecture
  Modular addon system with automatic route discovery and dependency resolution.

• 🧠 LLM Tooling & MCP Integration
  Expose endpoints as tools for agent frameworks using SSE and standard response models.

• 🧬 Multi-Database Support
  Native support for MongoDB (Beanie), SQL databases (SQLAlchemy), and Redis.

• 📦 Standardized API Responses
  Unified success/error format with automatic metadata injection and exception handling.

• ⚡ Performance-Optimized
  Fully async, lazily loaded, and built on FastAPI’s high-performance core.

• 🛠️ Developer Tooling
  Async-enabled IPython shell for rapid development.

pAPI is built around a composable addon architecture, where each addon functions like a LEGO® piece—self-contained, reusable, and designed to interlock with others.

These addons can:

• Register API routes (RESTRouter)
• Define database models (Beanie or SQLAlchemy)
• Hook into startup, shutdown processes (AddonSetupHook)

Together, they form a cohesive and scalable API system, enabling you to build robust, modular services by simply connecting or extending the building blocks your application needs.

Addons are declared in config.yaml, allowing clean separation of concerns and easy configuration.

• AI Agent Tooling
  Build modular tools for LLMs and agents.

• Composable Microservices
  Create reusable, pluggable service components.

• Rapid API Prototyping
  Launch structured APIs quickly with standardized behavior.

• Security and Auth Systems
  Implement RBAC/ABAC policies using addon-based security modules.

git clone https://github.com/efirvida/pAPI.git
cd pAPI
rye sync
rye run python papi/cli.py --help

Check the documentation for:

• Addon development
• CLI usage
• Response formatting
• Database integrations
• MCP/LLM support

👉 https://efirvida.github.io/pAPI/

1. Fork the repository
2. Create a feature branch (git checkout -b feature/my-feature)
3. Commit your changes
4. Push and open a Pull Request

MIT License © 2025 — Eduardo Miguel Firvida Donestevez