Sponsors API is a GitHub Sponsors server for displaying sponsor avatars in your project Readme. It looks like this:

Deploy to host which supports HTTP, for example using Apex Up or Heroku. The following environment variables are supported:

• GITHUB_TOKEN the GitHub API token (no scopes are required)
• PORT the server port (defaults to 3000)
• URL the url to your endpoint such as "https://sponsors.myhost.com" (optional)

Visit the /sponsor/markdown path for the markdown to copy/paste. Sponsors are cached for an hour by default, tweak with the -cache-ttl flag.