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curl --request POST \
--url https://api.ultravox.ai/api/voices \
--header 'Content-Type: multipart/form-data' \
--header 'X-API-Key: <your-api-key>' \
--form 'file=@/path/to/voice.mp3' \
--form 'name=My Custom Voice' \
--form 'description=Voice recorded on Jan 1, 2024'
{
  "voiceId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "description": "<string>",
  "primaryLanguage": "<string>",
  "previewUrl": "<string>",
  "ownership": "public",
  "billingStyle": "VOICE_BILLING_STYLE_INCLUDED",
  "provider": "<string>",
  "definition": {
    "elevenLabs": {
      "voiceId": "<string>",
      "model": "<string>",
      "speed": 123,
      "useSpeakerBoost": true,
      "style": 123,
      "similarityBoost": 123,
      "stability": 123,
      "pronunciationDictionaries": [
        {
          "dictionaryId": "<string>",
          "versionId": "<string>"
        }
      ],
      "optimizeStreamingLatency": 123,
      "maxSampleRate": 123
    },
    "cartesia": {
      "voiceId": "<string>",
      "model": "<string>",
      "speed": 123,
      "emotion": "<string>",
      "emotions": [
        "<string>"
      ],
      "generationConfig": {
        "volume": 123,
        "speed": 123,
        "emotion": "<string>"
      }
    },
    "lmnt": {
      "voiceId": "<string>",
      "model": "<string>",
      "speed": 123,
      "conversational": true
    },
    "google": {
      "voiceId": "<string>",
      "speakingRate": 123
    },
    "generic": {
      "url": "<string>",
      "headers": {},
      "body": {},
      "responseSampleRate": 123,
      "responseWordsPerMinute": 123,
      "responseMimeType": "<string>",
      "jsonAudioFieldPath": "<string>",
      "jsonByteEncoding": "JSON_BYTE_ENCODING_UNSPECIFIED"
    }
  }
}
Any created voices are private to your account. Uses multipart/form-data encoding to provide the name of the voice along with an audio file containing the voice to be used for cloning.
Currently, we support one cloned voice per account. If you need more cloned voices, please reach out.

Authorizations

​
X-API-Key
string
header
required

API key

Body

​
file
file
required

An audio file containing a sample of the voice to clone.

​
name
string
required

Name for the cloned voice. Must be unique within your account.

Example:

"My Custom Voice"

​
description
string

Optional description for the voice. If not provided, a default description will be generated.

Example:

"Voice recorded on Jan 1, 2024"

Response

201 - application/json
​
voiceId
string<uuid>
required
​
name
string
required
Maximum length: 40
​
previewUrl
string<uri>
required
​
ownership
enum<string>
required
Available options:
public,
private
​
billingStyle
enum<string>
required

How billing works for this voice. VOICE_BILLING_STYLE_INCLUDED - The cost of this voice is included in the call cost. There are no additional charges for it. VOICE_BILLING_STYLE_EXTERNAL - This voice requires an API key for its provider, who will bill for usage separately.

Available options:
VOICE_BILLING_STYLE_INCLUDED,
VOICE_BILLING_STYLE_EXTERNAL
​
provider
string | null
required
​
definition
object
required

A voice not known to Ultravox Realtime that can nonetheless be used for a call. Such voices are significantly less validated than normal voices and you'll be responsible for your own TTS-related errors. Exactly one field must be set.

​
description
string | null
Maximum length: 240
​
primaryLanguage
string | null

BCP47 language code for the primary language supported by this voice.

Maximum length: 10