# Blue Banana EHR > Synthetic FHIR R4 EHR sandbox for developers. Every patient is generated by Synthea and carries the `http://bluebananaehr.com/synthetic-data` extension — no real PHI. Start with the human-readable docs. > The working surface is the FHIR R4 CRUD endpoints at `/api/fhir/r4/*` plus webhook subscriptions (`/api/subscriptions`) and intake forms (`/api/intake/*`). All three accept bearer-API-key auth and deliver signed webhooks end-to-end. The agent runtime remains documented for forward compatibility only. ## Docs - [Quickstart and concepts](https://bluebananaehr.com/docs) - [API reference (Scalar)](https://bluebananaehr.com/docs/api) - [Webhook guide](https://bluebananaehr.com/docs/webhooks) ## Other (currently not working) - [Streaming guide (SSE)](https://bluebananaehr.com/docs/streaming) — `POST /api/agent` rejects every published `useCase` value. ## Machine-readable - [OpenAPI 3.1 spec](https://bluebananaehr.com/openapi.json) — tags prefixed `Experimental —` group the not-currently-working endpoints. - [Full plain-text dump](https://bluebananaehr.com/llms-full.txt) - [FHIR CapabilityStatement](https://bluebananaehr.com/api/fhir/r4/metadata)