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POST
/
infill
/
bytes
Infill (Bytes)
curl --request POST \
  --url https://api.cartesia.ai/infill/bytes \
  --header 'Authorization: Bearer <token>' \
  --header 'Cartesia-Version: <cartesia-version>' \
  --header 'Content-Type: multipart/form-data' \
  --form left_audio='@example-file' \
  --form right_audio='@example-file' \
  --form 'model_id=<string>' \
  --form 'language=<string>' \
  --form 'transcript=<string>' \
  --form 'voice_id=<string>' \
  --form 'output_format[container]=raw' \
  --form 'output_format[sample_rate]=8000' \
  --form 'output_format[encoding]=pcm_f32le' \
  --form 'output_format[bit_rate]=123'

Authorizations

​
Authorization
string
header
required

Cartesia API key

Headers

​
Cartesia-Version
enum<string>
required

API version header. Must be set to the API version, e.g. '2025-04-16'.

Available options:
2024-06-10,
2024-11-13,
2025-04-16,
2026-03-01
Example:

"2025-04-16"

Body

multipart/form-data
​
left_audio
file
​
right_audio
file
​
model_id
string

The ID of the model to use for generating audio. Any model other than the first "sonic" model is supported.

​
language
string

The language of the transcript

​
transcript
string

The infill text to generate

​
voice_id
string

The ID of the voice to use for generating audio

​
output_format[container]
enum<string>

The format of the output audio

Available options:
raw,
wav,
mp3
​
output_format[sample_rate]
enum<integer>

The sample rate of the output audio

Available options:
8000,
16000,
22050,
24000,
44100,
48000
​
output_format[encoding]
enum<string> | null

Required for raw and wav containers.

Available options:
pcm_f32le,
pcm_s16le,
pcm_mulaw,
pcm_alaw
​
output_format[bit_rate]
integer | null

Required for mp3 containers.

Response

204 - undefined