# API reference addresses

> Find System OpenAPI and Dev API documentation for China Mainland cloud, International cloud, and self-hosted deployments.

Source: https://doc.fastgpt.io/en/openapi/api-reference

Following the documentation transition in 4.15.0, generated references maintain current endpoint contracts. System OpenAPI covers operations explicitly accessible with API keys. Dev API covers internal development interfaces; follow each operation's authentication requirements.

* Self-hosted: `<instance>/apidoc/systemopenapi` and `<instance>/apidoc/devapi`.
* China Mainland cloud: [System OpenAPI](https://cloud.fastgpt.cn/apidoc/systemopenapi) and [Dev API](https://cloud.fastgpt.cn/apidoc/devapi).
* International cloud: [System OpenAPI](https://cloud.fastgpt.io/apidoc/systemopenapi) and [Dev API](https://cloud.fastgpt.io/apidoc/devapi).

For your first integration, start with [API getting started: make your first request](/en/openapi/intro).