# C integration libraries

The C integration libraries comprise C DataSource API and two extension libraries that provide trading, blotter, and notification functionality.

* **C DataSource API**\
The [C DataSource API](https://docs.caplin.com/developer/api/datasource_c/latest/) is the core DataSource library for C. Used by Liberator and Transformer.
* **C Blotter and Notification API**\
The [C Blotter and Notification API](https://docs.caplin.com/developer/api/datasource_extensions/latest/) extends the C DataSource API with APIs for to implement blotters and notifications. Requires the C DataSource API.
* **C Trading API**\
The [C Trading API](https://docs.caplin.com/developer/api/trading_c/latest/) extends the C DataSource API with APIs to implement trading. Requires the C DataSource API.

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**See also**:

* [Caplin Platform System Requirements](../platform-architecture/platform-hardware-and-software-requirements.md)