Introduction - PromptStream Docs

This section introduces the core PromptStream REST API for prompt management, experimentation, and usage tracking.

Welcome to the PromptStream API

The PromptStream API lets you version prompts, run A/B experiments, track outcomes, and meter usage—all via simple HTTP endpoints. We use an OpenAPI specification to define every route and model.

Authentication

All endpoints require your organisation’s API key in an HTTP header:

X-API-Key: YOUR_PROMPTSTREAM_API_KEY