Chatterbox Text to Speech API

Chatterbox Text-to-Speech

Chatterbox Text-to-Speech converts text into expressive speech with optional reference-audio guidance and adjustable generation controls. It is suitable for narration, character voice prototyping, creator voiceovers, and other prompt-free speech generation workflows where you want simple text input plus style tuning.

Why Choose This?

Text-to-speech generation
Turn written text into spoken audio with a simple workflow.
Optional reference voice guidance
Add reference_audio when you want the generated voice to follow a particular tone or vocal style.
Expressiveness control
Use exaggeration to make the delivery more restrained or more expressive.
Generation tuning
Adjust temperature and cfg for different levels of variation and prompt adherence.
Production-ready API
Useful for voiceovers, demos, creator content, character voice testing, and narration workflows.

Parameters

Parameter	Required	Description
text	Yes	Text to synthesize into speech.
reference_audio	No	Optional reference audio used to guide the generated voice style.
exaggeration	No	Controls how expressive or exaggerated the generated delivery sounds.
temperature	No	Controls randomness and variation in the generated speech.
cfg	No	Guidance setting used to influence generation behavior.

How to Use

Enter your text — provide the script you want the model to speak.
Add reference audio (optional) — upload a voice sample if you want style guidance.
Adjust exaggeration (optional) — increase it for more expressive delivery or keep it lower for a calmer tone.
Adjust temperature and cfg (optional) — tune generation behavior if needed.
Submit — run the model and download the generated speech audio.

Example Text

Welcome to wavespeed! It's nice to meet you!

Pricing

Pricing is based on the length of the input text.

Text Length	Cost
1–1000 characters	$0.03
1001–2000 characters	$0.06
2001–3000 characters	$0.09
3001–4000 characters	$0.12
4001–5000 characters	$0.15

Billing Rules

Pricing is $0.025 per started 1000 characters
Character count is rounded up in blocks of 1000
Minimum billed length is 1 block
reference_audio, exaggeration, temperature, and cfg do not affect pricing

Best Use Cases

Narration — Generate spoken audio for explainers, demos, and presentations.
Creator voiceovers — Produce quick voice tracks for short-form content.
Character voice prototyping — Explore delivery styles with optional reference voice guidance.
Product and onboarding content — Create friendly spoken intros or guidance clips.
Speech testing workflows — Compare different expressive settings from the same script.

Pro Tips

Keep the input text clean and naturally punctuated for better rhythm.
Add reference_audio only when you want stronger voice-style guidance.
Lower exaggeration for calm narration and raise it for more dramatic delivery.
Increase temperature when you want more variation, or keep it lower for steadier results.
Test short lines first before generating longer scripts.

Notes

text is required.
Pricing depends only on input text length.
Character count is billed in started 1000-character blocks.
Optional tuning controls affect delivery style, but not price.

Related Models

Other text-to-speech workflows — Useful when you need different voice style, pricing, or synthesis behavior.
Voice cloning workflows — Useful when you need a reusable voice identity instead of prompt-guided speech generation.
Audio generation workflows — Useful when you need music or sound generation instead of spoken voice.

Text To Speech API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/chatterbox/text-to-speech 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 Text To Speech below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/chatterbox/text-to-speech" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "exaggeration": 0.25,
    "temperature": 0.7,
    "cfg": 0.5
}'

# 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("chatterbox/text-to-speech", {
        "exaggeration": 0.25,
        "temperature": 0.7,
        "cfg": 0.5
});

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

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "chatterbox/text-to-speech",
    {
    "exaggeration": 0.25,
    "temperature": 0.7,
    "cfg": 0.5
}
)

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

Text To Speech API — Frequently asked questions

What is the Text To Speech API?

Text To Speech is a Chatterbox model for audio generation, exposed as a REST API on WaveSpeedAI. Chatterbox Text to Speech is a fast AI TTS model that converts text into expressive speech with optional reference audio, emotive tags, and delivery controls. Ready-to-use REST inference API for voice generation, narration, character dialogue, dubbing, virtual assistants, creator content, and professional text-to-speech 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 Text To Speech 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/chatterbox/chatterbox-text-to-speech.

How much does Text To Speech cost per run?

Text To Speech starts at $0.030 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 Text To Speech accept?

Key inputs: `cfg`, `exaggeration`, `reference_audio`, `temperature`, `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/chatterbox/chatterbox-text-to-speech.

How do I get started with the Text To Speech 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 Text To Speech outputs commercially?

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

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