CBSplit provides its API as an Addon, available through REST endpoints. Every request uses an API key (sent in the `X-API-Key` header). Responses are returned in JSON.

• SDK: There is no official SDK for Node.js or any other language at this time.
• REST API: Developers integrate using standard HTTP requests. Endpoints cover conversions, visits, assets, pages, layouts, snippets, quizzes, and quiz results.
• GraphQL: CBSplit does not currently provide GraphQL endpoints.
• Flexibility: Since the API is REST and JSON-based, you can call it from Node.js, Python, PHP, or any environment that can send HTTP requests.
• Addon management: API keys are managed from the CBSplit admin under the “Addons → API” section.

In short: CBSplit exposes a REST API via its API Addon. There is no official Node.js SDK or GraphQL endpoint. Developers should use the REST/JSON interface directly.