BYOAIK — Bring Your Own AI Key: a directory of AI tools that run on your own API key.

Letta

Open-source platform for building stateful AI agents with long-term memory

Website Source code

Category:

Agent Frameworks

Pricing:

Open Source

Open source:

Yes (Apache-2.0)

Self-hostable:

Yes

Local-first:

Yes

Platforms:

Self-hosted, CLI, Library/SDK, Web, Docker

AI providers (bring your own key):

OpenAI, Anthropic, Google Gemini, Azure OpenAI, OpenRouter, Groq, Mistral, DeepSeek, xAI Grok, Ollama, Together AI, Custom / OpenAI-compatible

API key storage:

Configured by environment variable

Key risk level:

LOW

Trust score:

90/100

Letta (formerly MemGPT, from UC Berkeley's Sky Computing Lab) is an open-source platform for building stateful AI agents with advanced, self-editing tiered memory that persists and self-improves across sessions. It exposes a server/API plus Python and TypeScript SDKs and a CLI (Letta Code), and is fully model-agnostic. Users bring their own provider API keys via environment variables (e.g. OPENAI_API_KEY, ANTHROPIC_API_KEY, GEMINI_API_KEY) when self-hosting the Docker server, or via /connect in Letta Code. BYOK is documented as working on all cloud tiers with OpenAI, Anthropic, and OpenRouter keys. It also supports configurable OpenAI-compatible base URLs/proxy endpoints for local and alternative backends (Ollama, vLLM, LM Studio), plus enterprise backends like Azure OpenAI, AWS Bedrock, and Google Vertex.

How your API key is handled

Your API key is supplied via an environment variable or local config file. Requests are sent directly to the AI provider. Because it can be self-hosted, your key never has to touch a third-party backend.

Setup

Install the tool, set your provider API key as an environment variable (or in its config file), and pick a model.