how much does HeyGen Instant Voice Clone cost?

$0.0007/sec audio (clone-only runs: free). you pay per run from your inference shell credits. no subscription is required.

how do I run HeyGen Instant Voice Clone via api?

call heygen/voice-clone with the javascript or python sdk, the rest api, or `belt app run heygen/voice-clone` from a terminal. the api reference on this page lists every input.

who makes HeyGen Instant Voice Clone?

HeyGen Instant Voice Clone is made by heygen and runs on inference shell. every heygen app is listed at https://inference.sh/apps/heygen.

can my agent use HeyGen Instant Voice Clone?

yes. agents call it as a tool through the inference shell mcp server (https://api.inference.sh/mcp), the belt cli or the sdk, and pay per run like you do.

what are the alternatives to HeyGen Instant Voice Clone?

other audio apps on inference shell include Fish Audio Drama 3, Eleven Flash v2.5, Eleven Multilingual v2, Eleven v3. they run through the same api, so switching is a one-line change.

HeyGen Instant Voice Clone

Clone a voice from a single short recording with HeyGen Instant Clone, and speak any text in it in the same call. The cloned voice ID also works with heygen/text-to-speech and avatar videos.

text to speech voice cloning

run in browser →run via API run with your agent

maker: heygen
category: audio
input → output: text → speech
runs via: api, javascript and python sdk, belt cli, mcp
updated: 2026-09-12
price: $0.0007/sec audio (clone-only runs: free)

api reference

about

clone a voice from a single short recording with heygen instant clone, and speak any text in it in the same call. the cloned voice id also works with heygen/text-to-speech and avatar videos.

get an api key

create one in settings → api keys. the examples read it from INFERENCE_API_KEY.

bash

1export INFERENCE_API_KEY="inf_your_key"

1. calling the api

install the client

nothing to install. any http client works; the examples use curl, and jq to read responses. every response wraps its result in a data field.

run and get result

send "wait": true to hold the connection until the task finishes. without it the call returns right away with the task still running.

bash

12# "wait": true holds the connection until the task finishes.3# the response is {"data": {"id", "status", "status_text", "output", ...}}4curl -X POST https://api.inference.sh/apps/run \5  -H "Authorization: Bearer $INFERENCE_API_KEY" \6  -H "Content-Type: application/json" \7  -d '{8    "app": "heygen/voice-clone",9    "input": {10      "audio": "https://example.com/file.png",11      "text": "Merhaba, bu benim klonlanmış sesim. Nasıl duyuluyor?"12    },13    "wait": true14  }'

stream live updates

get real-time progress updates as the task runs. ideal for showing progress bars, partial results, or long-running tasks. send "stream": true and the response is a server-sent event stream that ends when the task does.

bash

12# "stream": true answers with server-sent events until the task finishes3curl -N -X POST https://api.inference.sh/apps/run \4  -H "Authorization: Bearer $INFERENCE_API_KEY" \5  -H "Content-Type: application/json" \6  -d '{7    "app": "heygen/voice-clone",8    "input": {9      "audio": "https://example.com/file.png",10      "text": "Merhaba, bu benim klonlanmış sesim. Nasıl duyuluyor?"11    },12    "stream": true13  }'

run in the background

start the task and get its id back right away, then check on it later. for long tasks, or when you'd rather be called back, see webhooks.

bash

1# without "wait" the call returns the task right away (status 1, "received")2TASK_ID=$(curl -s -X POST https://api.inference.sh/apps/run \3  -H "Authorization: Bearer $INFERENCE_API_KEY" \4  -H "Content-Type: application/json" \5  -d '{6    "app": "heygen/voice-clone",7    "input": {8      "audio": "https://example.com/file.png",9      "text": "Merhaba, bu benim klonlanmış sesim. Nasıl duyuluyor?"10    }11  }' | jq -r '.data.id')1213# later: read its state. done when status is 10 (completed), 11 (failed) or 12 (cancelled)14curl -s https://api.inference.sh/tasks/$TASK_ID \15  -H "Authorization: Bearer $INFERENCE_API_KEY" | jq '.data | {status, status_text, output}'

2. authentication

the api uses api keys for authentication. see the authentication docs for detailed setup instructions.

3. files

file inputs are automatically handled by the sdk. you can pass local paths, urls, or base64 data.

automatic upload

pass urls directly or use data uris for inline content.

bash

1# pass URLs or data URIs as input values2curl -X POST https://api.inference.sh/apps/run \3  -H "Authorization: Bearer $INFERENCE_API_KEY" \4  -H "Content-Type: application/json" \5  -d '{6    "app": "heygen/voice-clone",7    "input": {8      "image": "https://example.com/image.png",9      "audio": "data:audio/mp3;base64,..."10    },11    "wait": true12  }'

manual upload

you can also upload files manually and use the returned url.

bash

1# 1. create the file: the response has an upload_url and the file's uri2FILE=$(curl -s -X POST https://api.inference.sh/files \3  -H "Authorization: Bearer $INFERENCE_API_KEY" \4  -H "Content-Type: application/json" \5  -d '{"files": [{"filename": "image.png", "content_type": "image/png"}]}')67# 2. PUT the bytes to upload_url8curl -X PUT "$(echo "$FILE" | jq -r '.data[0].upload_url')" \9  -H "Content-Type: image/png" \10  --data-binary @image.png1112# 3. pass the uri as an input value13echo "$FILE" | jq -r '.data[0].uri'

4. webhooks

get notified when a task completes by providing a webhook url. when the task reaches a terminal state (completed, failed, or cancelled), a POST request is sent to your url with the task result.

bash

1curl -X POST https://api.inference.sh/apps/run \2  -H "Authorization: Bearer $INFERENCE_API_KEY" \3  -H "Content-Type: application/json" \4  -d '{5    "app": "heygen/voice-clone",6    "input": {7        "audio": "https://example.com/file.png",8        "text": "Merhaba, bu benim klonlanmış sesim. Nasıl duyuluyor?"9    },10    "webhook": "https://your-server.com/webhook"11  }'

webhook payload

your endpoint receives a JSON POST with the task result:

json

1{2  "event": "task.completed",3  "timestamp": "2024-01-15T10:30:05Z",4  "data": {5    "id": "task_abc123",6    "short_id": "abc123",7    "status": 10,8    "status_text": "completed",9    "output": { ... },10    "created_at": "2024-01-15T10:30:00Z",11    "updated_at": "2024-01-15T10:30:05Z"12  }13}

eventstringtask.completed, task.failed or task.cancelled

timestampstringiso timestamp of the delivery

data.idstringtask id

data.short_idstringshort task id

data.statusnumberterminal status (10=completed, 11=failed, 12=cancelled, 13=rejected)

data.status_textstringthe status as a word: completed, failed or cancelled

data.outputobjecttask output (when completed)

data.errorstringerror message (when failed, omitted otherwise)

data.session_idstringsession id (when the task ran in a session, omitted otherwise)

data.created_atstringiso timestamp

data.updated_atstringiso timestamp

5. schema

input

audiostring(file)*

reference recording of the voice to clone. 30-60 seconds of clean, single-speaker speech works best.

textstring

text to speak in the cloned voice. leave empty to only create the voice and return its id.

example: "Merhaba, bu benim klonlanmış sesim. Nasıl duyuluyor?"

voice_namestring

display name for the cloned voice.

default: "cloned voice"maxLength:100

languagestring

language hint for the clone (e.g. 'tr', 'en'). auto-detected if omitted.

speednumber

speech speed multiplier for the generated audio (0.5-2.0).

default: 1min:0.5max:2

remove_background_noiseboolean

clean background noise out of the reference recording before cloning.

default: true

keep_voiceboolean

keep the cloned voice in the workspace so its id can be reused later. off by default: the clone is deleted after the audio is generated, because the heygen account holds a limited number of clone slots. forced on when no text is given.

default: false

output

audiostring(file)

speech generated in the cloned voice (if text was supplied).

keptboolean*

whether the voice still exists in the workspace. false means the clone was deleted after generation and the id is no longer usable.

preview_audio_urlstring

heygen's own short preview clip of the cloned voice.

voice_idstring*

cloned voice id. usable with heygen/text-to-speech and avatar videos while the voice is kept.

voice_namestring*

display name of the cloned voice.

other audio apps

Fish Audio Drama 3

fish-audio/drama-3

$50.00/1M UTF-8 bytes

Eleven Flash v2.5

elevenlabs/eleven-flash-v2-5

$0.04/1K characters

Eleven Multilingual v2

elevenlabs/eleven-multilingual-v2

$0.08/1K characters

Eleven v3

elevenlabs/eleven-v3

$0.08/1K characters

Eleven v4 Turbo

elevenlabs/eleven-v4-turbo

$0.04/1K characters

more from heygen

HeyGen Create Avatar

heygen/create-avatar

$1.00/call

HeyGen Text to Speech

heygen/text-to-speech

$0.0007/sec

HeyGen Lip Sync

heygen/lipsync

$0.033/sec speed, $0.067/sec precision

HeyGen Video Translate

heygen/video-translate

$0.033/sec (speed), $0.067/sec (precision), $0.033/sec (audio-only)

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from the blog

HeyGen Instant Voice Clone

api reference

about

get an api key

1. calling the api

install the client

run and get result

stream live updates

run in the background

2. authentication

3. files

automatic upload

manual upload

4. webhooks

5. schema

input

output

other audio apps

more from heygen

new models

ready to run HeyGen Instant Voice Clone?