Drop-in multilingual proxy for LLMs, MCP servers, and any HTTP+JSON API.

Most popular LLMs are trained predominantly on English: ask the same question in German or Japanese and the answer is measurably worse than in English, on the same model, for the same money. AdaptiveAPI sits between your app and the vendor so the LLM keeps seeing English while your user keeps seeing their language. JSON shapes, code blocks, URLs, tool schemas, and streaming deltas survive the round trip.

Change your SDK's base URL from api.openai.com / api.anthropic.com / your MCP server to AdaptiveAPI. That's it.

• Website: https://deejaytc.github.io/AdaptiveAPI/
• Docs: https://deejaytc.github.io/AdaptiveAPI/docs/

git clone https://github.com/DeeJayTC/AdaptiveAPI.git
cd AdaptiveAPI/deploy
cp .env.example .env
docker compose up --build

• API: http://localhost:8080 (health at /healthz)
• Admin UI: http://localhost:8000

See the docs for SDK usage, MCP setup, configuration, deployment, and everything else.

GNU Affero General Public License v3.0.

Copyright © 2026 Tim Cadenbach. AdaptiveApi.Core links against the DeepL .NET SDK (MIT) and other permissively-licensed dependencies listed in the project files.