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POST/v2/upload-cover/generate

POST /v2/upload-cover/generate

Upload your own audio file and generate an AI cover version with a new style, lyrics, and vocal settings — while retaining the original melody. Supports both custom mode (full control over lyrics, style, title) and non-custom mode (simple prompt-based generation). Audio file must not exceed 8 minutes in length.

POSThttps://udioapi.pro/api/v2/upload-cover/generate

tips

Two Generation Modes:

  • Non-Custom Mode (Recommended for beginners): Set custom_mode to false. Only upload_url and prompt are required. Lyrics will be auto-generated based on the prompt (max 500 chars).
  • Custom Mode: Set custom_mode to true. You must provide upload_url, prompt (used as exact lyrics), style, and title. If make_instrumental is true, prompt can be omitted.

Character Limits (vary by model):

  • chirp-v4-0: prompt (3000), style (200), title (80)
  • chirp-v4-5 / chirp-v4-5-plus: prompt (5000), style (1000), title (100)
  • chirp-v4-5-all: prompt (5000), style (1000), title (80)
  • chirp-v5 / chirp-v5-5: prompt (5000), style (1000), title (100)

Model Credits: chirp-v4-0 = 8 credits, chirp-v4-5 / chirp-v4-5-plus / chirp-v4-5-all = 10 credits, chirp-v5 / chirp-v5-5 = 12 credits each.

Developer Notes:

  • Generated files will be deleted after 15 days.
  • The uploaded audio must not exceed 8 minutes. For chirp-v4-5-all, the limit is 1 minute.
  • Use the Status API to poll for task completion (every 5–10 seconds).
  • You may also configure a callback_url to receive results via webhook.

requestHeaders

namerequireddescription
nameAuthorizationrequiredyesdescriptionBearer token for authentication
nameContent-Typerequiredyesdescriptionapplication/json

requestBody

Request body supports two modes: Non-Custom Mode (simple) or Custom Mode (full control)

commonParams

paramNameparamTyperequireddescriptionexample
paramNameupload_urlparamTypestringrequiredyesdescriptionURL of the audio file to cover. Must be a publicly accessible URL. The audio must not exceed 8 minutes (1 minute for chirp-v4-5-all).examplehttps://storage.example.com/my-song.mp3
paramNamemodelparamTypestringrequiredyesdescriptionAI model to use. Options: 'chirp-v4-0', 'chirp-v4-5', 'chirp-v4-5-plus', 'chirp-v4-5-all', 'chirp-v5', 'chirp-v5-5'.examplechirp-v4-5
paramNamecustom_modeparamTypebooleanrequirednodescriptionEnable custom mode for full control over lyrics, style, and title. Default: false. When false, only prompt and upload_url are needed.examplefalse
paramNamemake_instrumentalparamTypebooleanrequirednodescriptionGenerate instrumental music without vocals. When true in custom mode, prompt is not required.examplefalse
paramNamepromptparamTypestringrequirednodescriptionIn non-custom mode: a text description of desired output (max 500 chars, lyrics auto-generated). In custom mode: exact lyrics to be sung (max varies by model: 3000–5000 chars). Required unless make_instrumental is true.exampleA calm and relaxing piano track with soft melodies
paramNamestyleparamTypestringrequirednodescriptionMusic style/genre (custom mode only). Max length: 200 chars (chirp-v4-0), 1000 chars (other models). Leave empty in non-custom mode.examplepop, upbeat, electronic
paramNametitleparamTypestringrequirednodescriptionSong title (custom mode only). Max length: 80 chars (chirp-v4-0 / chirp-v4-5-all), 100 chars (other models). Leave empty in non-custom mode.exampleSummer Cover
paramNametagsparamTypestringrequirednodescriptionNegative tags — music styles or traits to exclude from the generated audio. Custom mode only.exampleHeavy Metal, Upbeat Drums
paramNamegenderparamTypestringrequirednodescriptionVocal gender preference. Use 'male' or 'female'. Only effective in custom mode. Note: can only increase the probability, not guarantee.examplefemale
paramNamestyle_weightparamTypenumberrequirednodescriptionStrength of adherence to style. Range 0–1, up to 2 decimals.example0.65
paramNameweirdness_constraintparamTypenumberrequirednodescriptionControls creative deviation. Range 0–1, up to 2 decimals.example0.65
paramNameaudio_weightparamTypenumberrequirednodescriptionBalance weight for audio features. Range 0–1, up to 2 decimals.example0.65
paramNamecallback_urlparamTypestringrequirednodescriptionURL to receive webhook notifications when the task completes. Your callback endpoint should accept POST requests with JSON payload.examplehttps://api.example.com/webhook/upload-cover

responses

json
{
  "code": 200,
  "message": "success",
  "workId": "upcov1a2b3c4d5e6f7890abcdef",
  "data": {
    "task_id": "upcov1a2b3c4d5e6f7890abcdef"
  }
}
json
{
  "code": 422,
  "message": "upload_url is required. Please provide a valid URL to your audio file (max 8 minutes)."
}
json
{
  "code": 400,
  "message": "No body provided"
}
json
{
  "code": 401,
  "message": "No API key provided in Authorization header"
}
json
{
  "code": 402,
  "message": "Insufficient credits. Required: 10, Available: 3"
}
json
{
  "code": 500,
  "message": "Internal Server Error",
  "data": {
    "task_id": "upcov1a2b3c4d5e6f7890abcdef"
  },
  "workId": "upcov1a2b3c4d5e6f7890abcdef"
}

codeExamples

curl (simple)
curl -X POST "https://udioapi.pro/api/v2/upload-cover/generate" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "chirp-v4-5",
    "upload_url": "https://storage.example.com/my-song.mp3",
    "custom_mode": false,
    "make_instrumental": false,
    "prompt": "A calm and relaxing piano cover with soft melodies"
  }'
curl (custom)
curl -X POST "https://udioapi.pro/api/v2/upload-cover/generate" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "chirp-v4-5",
    "upload_url": "https://storage.example.com/my-song.mp3",
    "custom_mode": true,
    "make_instrumental": false,
    "prompt": "[Verse]\nWalking down the street, feeling so free\n[Chorus]\nSummer dreams are calling me",
    "style": "pop, upbeat, electronic, 120 bpm",
    "title": "Summer Cover",
    "gender": "female",
    "style_weight": 0.65,
    "weirdness_constraint": 0.65,
    "audio_weight": 0.65
  }'
javascript
const response = await fetch('https://udioapi.pro/api/v2/upload-cover/generate', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model: 'chirp-v4-5',
    upload_url: 'https://storage.example.com/my-song.mp3',
    custom_mode: false,
    make_instrumental: false,
    prompt: 'A calm and relaxing piano cover with soft melodies'
  })
});

const data = await response.json();
console.log(data);
// { code: 200, message: "success", workId: "upcov...", data: { task_id: "upcov..." } }

// Then poll for status:
const statusRes = await fetch(
  'https://udioapi.pro/api/v2/upload-cover/status?task_id=' + data.data.task_id,
  { headers: { 'Authorization': 'Bearer YOUR_API_KEY' } }
);
const status = await statusRes.json();
console.log(status);
GET/v2/upload-cover/status?task_id=xxx

GET /v2/upload-cover/status?task_id=xxx

Check the status and results of an Upload & Cover task. Poll this endpoint every 5–10 seconds until the task completes or fails. Credits are automatically refunded if the task fails.

GEThttps://udioapi.pro/api/v2/upload-cover/status?task_id=xxx

tips

Status Types:

  • IN_PROGRESS: Task is still being processed. Keep polling.
  • SUCCESS: Task completed successfully. response_data contains the generated audio URLs.
  • FAILED: Task failed (e.g., content moderation violation). Credits are refunded automatically.
  • ERROR: An error occurred during processing.

Failure Detection: Check fail_message and error_message fields in the response data for error details like "Does Not Meet Guidelines".

Poll this endpoint every 5–10 seconds until generation completes or fails.

requestParams

paramNameparamTyperequireddescription
paramNametask_idparamTypestringrequiredyesdescriptionThe unique task ID returned from the generate endpoint.

responses

json
{
  "code": 200,
  "message": "success",
  "data": {
    "type": "IN_PROGRESS",
    "request_body": {
      "model": "chirp-v4-5",
      "upload_url": "https://storage.example.com/my-song.mp3",
      "custom_mode": false,
      "prompt": "A calm and relaxing piano cover"
    },
    "response_data": null,
    "created_at": "2026-02-07T12:00:00.000Z"
  }
}
json
{
  "code": 200,
  "message": "success",
  "data": {
    "type": "SUCCESS",
    "request_body": {
      "model": "chirp-v4-5",
      "upload_url": "https://storage.example.com/my-song.mp3",
      "custom_mode": false,
      "prompt": "A calm and relaxing piano cover"
    },
    "response_data": [
      {
        "id": "e231xxxx-xxxx-xxxx-xxxx-xxxx8cadc7dc",
        "audio_url": "https://cdn1.suno.ai/xxxx.mp3",
        "image_url": "https://cdn2.suno.ai/image_xxxx.jpeg",
        "image_large_url": "https://cdn2.suno.ai/image_xxxx.jpeg",
        "created_at": "2026-02-07T12:00:00.000Z",
        "status": "complete",
        "title": "Summer Cover",
        "prompt": "[Verse] Walking down the street, feeling so free",
        "tags": "pop, upbeat",
        "duration": 198.44,
        "model_name": "chirp-v4-5",
        "extra_message": "synced_from_api",
        "fail_message": "",
        "error_message": ""
      },
      {
        "id": "bd15xxxx-xxxx-xxxx-xxxx-xxxxxxxx1873",
        "audio_url": "https://cdn1.suno.ai/yyyy.mp3",
        "image_url": "https://cdn2.suno.ai/image_yyyy.jpeg",
        "image_large_url": "https://cdn2.suno.ai/image_yyyy.jpeg",
        "created_at": "2026-02-07T12:00:00.000Z",
        "status": "complete",
        "title": "Summer Cover",
        "prompt": "[Verse] Walking down the street, feeling so free",
        "tags": "pop, upbeat",
        "duration": 228.28,
        "model_name": "chirp-v4-5",
        "extra_message": "synced_from_api",
        "fail_message": "",
        "error_message": ""
      }
    ],
    "created_at": "2026-02-07T12:00:00.000Z"
  }
}
json
{
  "code": 200,
  "message": "success",
  "data": {
    "type": "FAILED",
    "request_body": {
      "model": "chirp-v4-5",
      "upload_url": "https://storage.example.com/my-song.mp3",
      "custom_mode": false,
      "prompt": "..."
    },
    "response_data": [
      {
        "status": "FAILED",
        "fail_message": "Does Not Meet Guidelines",
        "error_message": "Does Not Meet Guidelines"
      },
      {
        "status": "FAILED",
        "fail_message": "Does Not Meet Guidelines",
        "error_message": "Does Not Meet Guidelines"
      }
    ],
    "created_at": "2026-02-07T12:00:00.000Z"
  }
}
json
{
  "code": 404,
  "message": "Task not found",
  "data": null
}
json
{
  "code": 500,
  "message": "Internal Server Error",
  "data": null
}

codeExamples

curl
curl -X GET "https://udioapi.pro/api/v2/upload-cover/status?task_id=upcov1a2b3c4d5e6f7890abcdef" \
  -H "Authorization: Bearer YOUR_API_KEY"
javascript
// Poll until completed
async function pollStatus(taskId) {
  while (true) {
    const res = await fetch(
      'https://udioapi.pro/api/v2/upload-cover/status?task_id=' + taskId,
      { headers: { 'Authorization': 'Bearer YOUR_API_KEY' } }
    );
    const result = await res.json();

    if (result.data?.type === 'SUCCESS') {
      console.log('Audio URLs:', result.data.response_data.map(d => d.audio_url));
      return result;
    }
    if (result.data?.type === 'FAILED' || result.data?.type === 'ERROR') {
      console.error('Task failed:', result.data.response_data);
      return result;
    }

    // Still in progress, wait 5 seconds
    await new Promise(r => setTimeout(r, 5000));
  }
}