Text to speech

Product

POST /v1/tts

Voices that pronounce Indian names correctly, switch scripts mid-sentence, and sound the same next month as they do today. Three tiers, one endpoint.

TRY IT IN THE BROWSER READ THE DOCS

Models

Version	Aliases	Rate / 1M chars
echo-turbo-1.0.0 Lowest latency. Voice agents and IVR.	echo-turbo · echo-turbo-1	$8
echo-1.0.0 The default. Balanced quality and speed.	echo-1 · echo-latest	$15
echo-pro-1.0.0 Most expressive. Narration and long form.	echo-pro · echo-pro-1	$40

Aliases move when a new version ships. Exact versions never do — pin one to a key and that key is frozen until you change it.

Controls

text	1 – 5 000 characters, whitespace collapsed
voice_id	14 public voices, plus your org's own
speed	0.25 – 4.0× · out of range is rejected, not clamped
pitch	−20 – +20 semitones
seed	any integer · same seed, same bytes
output_format	wav_<rate> · pcm_<rate> · mulaw_<rate>

✓ mulaw_8000 for telephony✓ pcm for streaming into your own mixer✓ mp3 and opus are not available yet

Example

One request, one wav file.

import requests

r = requests.post(
    "https://api.vocalix.ai/v1/tts",
    headers={"Authorization": f"Bearer {KEY}"},
    json={
        "text": "आपका parcel आज शाम तक deliver हो जाएगा।",
        "voice_id": "meera-hi",
        "model": "echo-1",
        "output_format": "wav_22050",
        "speed": 1.0,
        "seed": 42,
    },
)
r.raise_for_status()
open("reply.wav", "wb").write(r.content)
print(r.headers["X-Vocalix-Model-Version"])   # echo-1.0.0