S1 / SVC — REST API v1
Singing voice conversion for whole songs.
You send a finished track and a short voice sample. The API pulls the vocal out, re-sings it in the sampled voice, mixes it back and masters the result. You get one file.
State of the art. #1 singing-voice-conversion quality on the market. Do not take our word for it: run your own track through the demo and listen.
$0.06 per minute of source audio · tracks up to 10 min · about 2 min per track
Demo
Hear ten seconds of it
Pick a song and a voice. We cut 10 seconds from the middle of the song, convert them and play the fragment here. No account needed.
- State of the art: #1 SVC quality on the market
- Whole songs, not stems
- Mixed and mastered
- $0.06 per minute
- Billed per second
- MP3 / WAV
- Failed jobs cost nothing
- Inputs deleted when the job ends
- Result deleted after 5 min
Signal path
What happens to your track
The instrumental is never touched by the voice model. It goes around the conversion and meets the new vocal at the mix, so the arrangement you sent is the arrangement you get back.
Processing is asynchronous. A typical track takes about two minutes; when the queue is long the job status tells you your position and an estimate in seconds.
Pricing
Price and specifications
$0.06/ min
Per minute of the source track, counted to the second. A 3 min 30 s song costs $0.21.
You spend from a prepaid balance in US dollars. There is no online checkout: contact us to get access and add credit. When a job starts we hold the price of a 10-minute track ($0.60); when it ends we charge the real length and release the rest. A failed job releases the whole hold.
| Quality | State of the art. #1 SVC quality on the market. Hear it in the demo. |
|---|---|
| Price | $0.06 per minute of source audio |
| Billing step | 1 second |
| Credit | added by arrangement — contact us |
| Charged when | the job succeeds; failed jobs cost nothing |
| Track length | up to 10 min |
| File size | up to 200 MB per file |
| Output | MP3 or WAV, mixed and mastered |
| Typical time | about 2 min per track |
| Result link | valid for 5 min |
| Interface | REST, asynchronous jobs, bearer key |
Nothing is kept.
- 0:00You upload a song and a voice sample.
- job endsBoth uploads are deleted — whether the job succeeded or failed.
- +5 minThe result is deleted. It cannot be downloaded again.
An account is a nickname and a password. We do not ask for an email or any other personal data. What stays in it is a row of numbers per job: status, track duration, cost, timestamps. No audio and no file names.
The site sets one session cookie after you log in. There are no analytics or advertising cookies. Details are in the Privacy Policy.
API
Four requests
POST /v1/jobs | Returns a job id and two upload links, valid for 30 min. |
|---|---|
PUT ×2 | Raw bytes of the song and the voice sample to those links. |
POST …/start | Places the hold and queues the job. |
GET /v1/jobs/{id} | Poll it. On done it carries result_url. |
Error codes, the job object and a complete Python client are in the docs.
curl -X POST "$S1_API/v1/jobs" \
-H "Authorization: Bearer $S1_KEY" \
-H "Content-Type: application/json" \
-d '{"format": "mp3"}'
curl -T song.mp3 "$TRACK_URL"
curl -T voice.wav "$VOICE_URL"
curl -X POST "$S1_API/v1/jobs/$JOB_ID/start" \
-H "Authorization: Bearer $S1_KEY"
curl "$S1_API/v1/jobs/$JOB_ID" \
-H "Authorization: Bearer $S1_KEY"Questions
- Which formats come back?
- MP3 or WAV. You choose when you create the job.
- How long does it take?
- About two minutes for a typical track. If the queue is busy it takes longer, and the status shows an estimate.
- What does a track cost?
- $0.06 per minute of the source track, counted to the second. A 3-minute song is $0.18.
- How do I pay?
- We set you up personally: message us, we agree on volume and payment, and credit your balance.
- What if a job fails?
- You pay nothing. The hold goes back to your balance and the status carries the reason.
- How long can I download the result?
- For 5 minutes after the job is done. After that the file is gone, so download it as soon as the status says
done. - What do I need to sign up?
- A nickname and a password. No email and no personal data. You get a recovery code once, at sign-up — keep it, it is the only way to restore access.
- Who owns the output?
- We claim no rights in your uploads or in the result. What you may do with it depends on the rights you hold in the song and the voice. See the Terms.
- Can I use anyone's voice?
- No. You need the rights or permission for both the song and the voice, and you may not impersonate a real person without their consent. See Acceptable Use.