Veo 3.1

Google Veo 3.1 video generation model. Supports text-to-video, image-to-video, first-and-last-frame, and reference-based generation, with background music included.

Model

Model Name	Modes	Aspect Ratios
`veo-3`	fast (default), quality	16:9, 9:16, Auto

Pricing

Per-mode billing:

Mode	Credits	Price
fast	40 credits	$0.20
quality	300 credits	$1.50

Create Task

curl -X POST https://api.aivideoapi.ai/v1/videos/generations \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "veo-3",
    "input": {
      "prompt": "A dog playing in a park, cinematic lighting",
      "mode": "fast",
      "aspect_ratio": "16:9"
    }
  }'

Request Body

Field	Type	Required	Description
`model`	string	Yes	Must be `veo-3`
`input`	object	Yes	Generation parameters, see below
`callback_url`	string	No	URL to receive task completion/failure notifications

Input Object

Field	Type	Required	Description
`prompt`	string	Yes	Text description
`mode`	string	No	`fast` (default) or `quality`
`aspect_ratio`	string	No	`16:9` (default), `9:16`, or `Auto`
`generation_type`	string	No	Generation mode, see Generation Type
`image_urls`	string[]	No	Image URLs for image-to-video modes
`seeds`	integer	No	Random seed (10000-99999) for controlling randomness
`watermark`	string	No	Watermark text

Generation Type

Value	Description
`TEXT_2_VIDEO`	Text-to-video (default when no images provided)
`FIRST_AND_LAST_FRAMES_2_VIDEO`	First/last frame mode. 1 image = first frame, 2 images = first + last frame
`REFERENCE_2_VIDEO`	Reference-based generation. 1-3 reference images. mode=fast only

When generation_type is not specified, the system auto-detects based on whether image_urls is provided.

Example: Text-to-Video

curl -X POST https://api.aivideoapi.ai/v1/videos/generations \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "veo-3",
    "input": {
      "prompt": "A drone shot flying over mountains at sunset, cinematic lighting",
      "mode": "fast",
      "aspect_ratio": "16:9"
    }
  }'

Example: First and Last Frames

curl -X POST https://api.aivideoapi.ai/v1/videos/generations \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "veo-3",
    "input": {
      "prompt": "A person walks from the park to the city center",
      "generation_type": "FIRST_AND_LAST_FRAMES_2_VIDEO",
      "image_urls": [
        "https://example.com/start.jpg",
        "https://example.com/end.jpg"
      ],
      "aspect_ratio": "16:9"
    }
  }'

Example: Reference-Based Generation

curl -X POST https://api.aivideoapi.ai/v1/videos/generations \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "veo-3",
    "input": {
      "prompt": "Create a product showcase video based on these reference images",
      "generation_type": "REFERENCE_2_VIDEO",
      "mode": "fast",
      "image_urls": [
        "https://example.com/ref1.jpg",
        "https://example.com/ref2.jpg"
      ],
      "aspect_ratio": "16:9"
    }
  }'

Response

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "cbf6b69d-4f03-4817-8ed7-94c0292184a8"
  }
}

Query Task

curl https://api.aivideoapi.ai/v1/tasks/{taskId} \
  -H "Authorization: Bearer sk-your-api-key"

Status transitions: pending -> processing -> completed or failed.

Processing

{
  "id": "e717a5ee-2ed4-47f4-8cc3-53394f1abb35",
  "status": "processing",
  "model": "veo-3",
  "created_at": 1774706165,
  "progress": null
}

Completed

{
  "id": "7d89c51e-9430-410e-909e-df347131ebaa",
  "status": "completed",
  "model": "veo-3",
  "created_at": 1774790227,
  "completed_at": 1774796529,
  "output": {
    "urls": [
      "https://file.aivideoapi.ai/videos/2026/04/02/abc123.mp4"
    ],
    "metadata": {
      "resolution": "720p"
    }
  }
}

Video URLs are permanent. All videos include background music by default.

Failed

{
  "id": "57c8772c-f834-46f3-9b7d-81f92e104050",
  "status": "failed",
  "model": "veo-3",
  "created_at": 1774793758,
  "error": {
    "code": "upstream_error",
    "message": "Video generation failed"
  }
}

When a task fails, pre-charged credits are automatically refunded.

Callback

Pass callback_url when creating the task. The system will automatically send a POST request to your URL when the task completes or fails. The format matches the query task response.

Video Extension

Use extend_task_id to extend a completed video:

curl -X POST https://api.aivideoapi.ai/v1/videos/generations \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "veo-3-extend",
    "input": {
      "prompt": "Continue the scene, camera slowly zooms out",
      "extend_task_id": "upstream task id of the original video"
    }
  }'

Error Codes

When a request fails, the API returns a JSON error response:

{
  "error": {
    "code": "insufficient_credits",
    "message": "Your credit balance is too low. Please top up.",
    "type": "billing_error"
  }
}

Error Reference

HTTP Status	Code	Type	Description
400	`invalid_request`	invalid_request_error	Missing or invalid parameters
401	`invalid_api_key`	authentication_error	API key is invalid, disabled, or deleted
402	`insufficient_credits`	billing_error	Credit balance too low, please top up
403	`ip_not_allowed`	permission_error	Request IP not in the key's allowlist
404	`model_not_found`	invalid_request_error	Model does not exist or is inactive
404	`task_not_found`	invalid_request_error	Task ID does not exist
429	`rate_limit_exceeded`	rate_limit_error	Too many requests, please slow down
429	`spend_limit_exceeded`	billing_error	Key spend limit reached (hourly/daily/total)
500	`internal_error`	api_error	Unexpected server error
503	`upstream_error`	upstream_error	Upstream AI provider returned an error

Common Scenarios

invalid_request (400)

Returned when required fields are missing or invalid.

{
  "error": {
    "code": "invalid_request",
    "message": "'model' is required.",
    "type": "invalid_request_error"
  }
}

insufficient_credits (402)

Your balance is too low. Check your balance with GET /v1/credits and top up in Dashboard > Billing.

invalid_api_key (401)

Possible causes:

The key does not start with sk-
The key has been disabled or deleted
The user account has been banned

upstream_error (503)

The upstream AI provider returned an error. This may happen when:

The input contains sensitive or prohibited content
The provider is temporarily unavailable
The request parameters are not supported by the provider

Credits are automatically refunded when a task fails due to upstream errors.