Contribute to the API
The HTTP API at api.dicebear.com is a Fastify server that lives in its own repository: dicebear/api.
The contribution guide, including local setup, the test suite, the Docker-based production image, and the release process, lives alongside the code:
CONTRIBUTING.mdindicebear/api
For hosting the API yourself (as opposed to working on its source), see Host the HTTP API yourself.