Zonos2 Voice Cloning Text to Speech API

Zonos2 Voice Cloning Text-to-Speech

Zonos2 Voice Cloning Text-to-Speech is an open-source, real-time text-to-speech model from Zyphra. It clones a voice from a short reference audio sample and synthesizes the supplied text in the cloned voice.

Why Choose This?

Voice cloning from reference audio
Clone a speaker's voice from a short audio sample and generate speech from text.
Real-time text-to-speech model
Built on Zonos2, an open-source real-time TTS model from Zyphra.
Background cleanup option
Use clean_speaker_background when the reference audio has a clean background.
Standard audio output
The generated audio is returned as a URL in the standard WaveSpeed prediction response.

Parameters

Parameter	Required	Description
audio	Yes	Reference audio URL used to clone the voice. A short, clear sample works best.
text	Yes	Text to synthesize in the cloned voice.
clean_speaker_background	No	Enable when the reference audio has a clean background.

How to Use

Upload reference audio — Provide a short, clear audio sample of the speaker voice you want to clone.
Enter text — Provide the text that should be spoken in the cloned voice.
Set background option (optional) — Enable clean_speaker_background when the reference audio has a clean background.
Submit — Generate the cloned-voice speech output.

Output

Returns generated audio URL(s) in the standard WaveSpeed prediction response.

The generated audio is returned as WAV, 44.1kHz mono.

Pricing

Pricing is $0.01 per minute.

Reference Audio Duration	Billed Minutes	Price
0-60s	1	$0.01
61-120s	2	$0.02
121-180s	3	$0.03

Billing Rules

Billing is based on the reference audio duration.
Reference audio duration is rounded up to the next full minute.
Minimum billing duration is 1 minute.
Each billed minute costs $0.01.

Best Use Cases

Voice cloning TTS — Generate speech in a cloned voice from a reference audio sample.
Narration generation — Create spoken narration from text using a target speaker voice.
Dialogue prototyping — Test voice lines, character speech, or script variations.
Localized speech generation — Use supported language normalization codes for multilingual text handling.
Audio content creation — Generate voice audio for videos, demos, apps, or creative workflows.

Pro Tips

Use clean reference audio with minimal background noise for better cloning quality.
Use a short and clear speaker sample for more stable voice cloning.
Make sure the reference audio contains the target speaker clearly.
Enable clean_speaker_background only when the reference audio has a clean background.
Ensure the audio URL is publicly accessible.

Notes

audio and text are required fields.
Provider sampling settings use the default mapping values.

Zonos2 API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/zonos2 with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Zonos2 below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/zonos2" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "audio": "https://example.com/your-audio.mp3",
    "clean_speaker_background": false
}'

# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# When status is "completed", read the output from data.outputs[0].

Node.js example

// npm install wavespeed
const WaveSpeed = require('wavespeed');

const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env

const result = await client.run("wavespeed-ai/zonos2", {
        "audio": "https://example.com/your-audio.mp3",
        "clean_speaker_background": false
});

console.log(result.outputs[0]); // → URL of the generated output

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "wavespeed-ai/zonos2",
    {
    "audio": "https://example.com/your-audio.mp3",
    "clean_speaker_background": false
}
)

print(output["outputs"][0])  # → URL of the generated output

Zonos2 API — Frequently asked questions

What is the Zonos2 API?

Zonos2 is a WaveSpeedAI model for AI inference, exposed as a REST API on WaveSpeedAI. Zonos2 is a fast multilingual voice-cloning text-to-speech model that generates natural speech from text using a short reference audio sample. Ready-to-use REST inference API for voice cloning, multilingual TTS, narration, dubbing, character dialogue, virtual assistants, creator content, and professional speech generation workflows with simple integration, no coldstarts, and affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Zonos2 API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/wavespeed-ai/zonos2.

How much does Zonos2 cost per run?

Zonos2 starts at $0.010 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Zonos2 accept?

Key inputs: `audio`, `clean_speaker_background`, `text`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/wavespeed-ai/zonos2.

How do I get started with the Zonos2 API?

Sign up for a free WaveSpeedAI account to claim starter credits, copy your API key from /accesskey, then call the endpoint shown in the API tab of the playground. The playground also auto-generates a code sample in Python, JavaScript, or cURL for the parameters you've set.

Can I use Zonos2 outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (WaveSpeedAI). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

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