[Документация Yandex Cloud](../../../../index.md) > [speechkit](../../../index.md) > Справочники API > Синтез > API v3 gRPC (англ.) > Overview

# SpeechKit Synthesis Service API v3: gRPC reference

The SpeechKit Text To Speech API v3 allows application developers to use speech synthesis technologies. <br>The service does not operate with resources. Actions are performed by making RPC calls. For more information about API architecture, see [API Concepts](../../../../api-design-guide/index.md). <br><strong> API has limitation — the request cannot exceed 250 characters and 24 seconds for synthesis.</strong>

**Interface definitions** available at [GitHub](https://github.com/yandex-cloud/cloudapi/tree/master/yandex/cloud/ai/tts/v3).

**Service URL**: `tts.api.ml.yandexcloud.kz`

#|
||Service | Description ||
|| [Synthesizer](Synthesizer/index.md) | A set of methods for voice synthesis. ||
|#