Integrate the ElevenLabs Text-to-Speech API to generate and stream audio

Steps

1. Authenticate by including your API key in the 'xi-api-key' HTTP header on all requests — obtain your key from the ElevenLabs dashboard under Profile > API Key
2. List available voices by GETting 'https://api.elevenlabs.io/v1/voices' — the response contains an array of voice objects with 'voice_id', 'name', 'labels', and 'preview_url'; use the 'voice_id' value to specify a voice in generation requests
3. Generate speech by POSTing to 'https://api.elevenlabs.io/v1/text-to-speech/{voice_id}' with a JSON body containing 'text' (the content to synthesize), 'model_id' (e.g., 'eleven_flash_v2_5' for low-latency or 'eleven_multilingual_v2' for quality), and optionally 'voice_settings' with 'stability' and 'similarity_boost' floats between 0 and 1
4. Set the 'Accept' header to 'audio/mpeg' to receive MP3 output — the response body is the raw audio binary; write it directly to a file or pipe it to a player
5. For streaming audio in real time, POST to 'https://api.elevenlabs.io/v1/text-to-speech/{voice_id}/stream' — the response is a chunked stream of audio bytes you can forward directly to an audio player or WebSocket client without waiting for the full file
6. For the lowest latency in voice agent applications, use the WebSocket endpoint at 'wss://api.elevenlabs.io/v1/text-to-speech/{voice_id}/stream-input' which accepts text chunks incrementally and returns audio chunks as soon as each is synthesized