# Myeongpil 명필 API > A coding-agent next-step API for scoped, repetitive Unity and development work. Base URL: https://myeongpil.14dimension.com Authentication: `X-API-Key` header. Request a free key with `POST /signup`. JSON requests: send `Content-Type: application/json`. ## Documentation - [Full agent guide](https://myeongpil.14dimension.com/llms-full.txt): endpoints, history format, limits, and behavior - [OpenAPI specification](https://myeongpil.14dimension.com/openapi.json): machine-readable schemas - [Interactive API docs](https://myeongpil.14dimension.com/docs): browser-based Swagger documentation - [Product page](https://myeongpil.14dimension.com/): overview, pricing, and setup ## Related - [MyungChul product hub](https://ai.14dimension.com/llms.txt): choose among all eight products