Build an AI Voice Agent with Fish.audio API

Fish.audio makes it surprisingly easy to create natural-sounding AI voice agents. The platform offers high-quality text-to-speech (TTS), speech-to-text, instant voice cloning, and even a dedicated Agents feature (currently in private beta) that handles real-time conversations end-to-end.

In this practical tutorial, you’ll learn how to set up a complete voice agent using the Fish.audio API. Start by creating an API key in the Fish.audio dashboard. Then combine it with an LLM (via OpenRouter or similar) for intelligent responses. The core flow is simple: transcribe incoming speech with ASR, generate a reply with your preferred language model, and stream the answer back as lifelike audio using Fish.audio’s TTS (models like S2.1 Pro deliver excellent quality and low latency).

You can pick from a large voice library or clone a custom voice in seconds. The official Python and JavaScript SDKs make integration clean—just a few lines of code to convert text to speech or run a full agent loop. For more advanced use, the Agents API lets you define system prompts, attach knowledge bases, and publish ready-to-talk agents that work in the browser or over phone lines.

Whether you’re building a customer-support bot, a sales assistant, or an interactive voice experience, Fish.audio gives you production-ready voice capabilities without the complexity of stitching multiple services together.