[Yandex Cloud documentation](../../../index.md) > [Yandex SmartCaptcha](../../index.md) > API reference > gRPC > Overview

# SmartCaptcha API: gRPC reference

Actions are performed by making RPC calls. For more information about API architecture, see [API Concepts](../../../api-design-guide/index.md).

**Interface definitions** available at [GitHub](https://github.com/yandex-cloud/cloudapi/tree/master/yandex/cloud/smartcaptcha/v1).

**Service URL**: `https://smartcaptcha.api.cloud.yandex.net`

#|
||Service | Description ||
|| [Captcha](Captcha/index.md) | A set of methods for managing Captcha resources. ||
|| [Operation](Operation/index.md) | A set of methods for managing operations for asynchronous API requests. ||
|#