Kling 3.0 Std API

Standard-quality video generation API with text-to-video, image-to-video, and motion-control modes

Overview

Kling 3.0 Std is a standard-quality video generation model for text prompts, reference-image animation, and motion transfer from a reference video. Use this page when you are ready to call the API after trying the model in the APIXO playground.

Capability	Value
Model ID	kling-3-0-std
Modes	text-to-video, image-to-video, motion-control
Text prompt	Required for text-to-video and image-to-video; optional for motion-control
Reference images	image-to-video: 1-2 URLs; motion-control: exactly 1 URL
Reference video	motion-control: exactly 1 public MP4, MOV, or M4V URL
Duration	text-to-video and image-to-video: 3-15 seconds, default 5
Motion-control duration	Auto-detected from video_urls[0]; videos over 30 seconds are rejected
Aspect ratios	1:1, 9:16, 16:9 for text-to-video

Endpoint and authentication

Base URL:

https://api.apixo.ai/api/v1

Method	Endpoint	Purpose
POST	/generateTask/kling-3-0-std	Submit a generation task
GET	/statusTask/kling-3-0-std?taskId={taskId}	Poll task status and retrieve results

All requests require your APIXO API key:

Authorization: Bearer YOUR_API_KEY

Submit requests also require:

Content-Type: application/json

Copy-paste async quickstart

This minimal request submits a text-to-video task and returns a taskId.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/kling-3-0-std" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-video",
      "prompt": "a cinematic city skyline at sunset, slow camera push-in",
      "duration": 5,
      "sound": false,
      "aspect_ratio": "16:9"
    }
  }'

Successful response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Save the taskId; you need it to poll for the final result.

Poll for result

curl -X GET "https://api.apixo.ai/api/v1/statusTask/kling-3-0-std?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Processing response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "processing",
    "createTime": 1767965610929
  }
}

Success response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://file.apixo.ai/video.mp4\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965712317,
    "costTime": 101388
  }
}

Failed response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "CONTENT_VIOLATION",
    "failMsg": "Content does not meet safety guidelines",
    "createTime": 1767965610929,
    "completeTime": 1767965620132
  }
}

Parse resultJson after state becomes success:

const payload = JSON.parse(data.resultJson);
const videoUrls = payload.resultUrls;

Request body

Text-to-video

{
  "request_type": "async",
  "input": {
    "mode": "text-to-video",
    "prompt": "a cinematic city skyline at sunset, slow camera push-in",
    "negative_prompt": "blur, low quality",
    "duration": 5,
    "sound": false,
    "aspect_ratio": "16:9",
    "cfg_scale": 0.5,
    "multi_prompt": [
      {
        "duration": 2,
        "prompt": "wide establishing shot"
      },
      {
        "duration": 3,
        "prompt": "slow push-in toward glowing skyscrapers"
      }
    ]
  }
}

Image-to-video

{
  "request_type": "async",
  "input": {
    "mode": "image-to-video",
    "prompt": "animate the character waving to the camera",
    "duration": 6,
    "sound": true,
    "image_urls": [
      "https://example.com/start.png",
      "https://example.com/end.png"
    ],
    "cfg_scale": 0.5
  }
}

Motion-control

{
  "request_type": "async",
  "input": {
    "mode": "motion-control",
    "prompt": "keep the same character identity while following the motion reference",
    "negative_prompt": "distorted face, extra limbs",
    "sound": true,
    "character_orientation": "video",
    "image_urls": [
      "https://example.com/character.png"
    ],
    "video_urls": [
      "https://example.com/motion.mp4"
    ]
  }
}

Parameters

request_type · string · default: "async" · required

Result delivery mode. Use async for polling with statusTask, or callback for webhook delivery.

callback_url · string

Required when request_type is callback. Must be a public HTTPS URL that can receive the final task payload. See Webhooks.

input · object · required

Kling 3.0 Std input parameters.

Show properties

mode · string · required

Generation mode. Supported values: text-to-video, image-to-video, motion-control.

prompt · string

Text prompt for the video. Required for text-to-video and image-to-video; optional for motion-control. If provided, it must be a non-empty string.

negative_prompt · string

Optional negative prompt. If provided, it must be a non-empty string.

duration · integer · default: "5"

Output duration in seconds for text-to-video and image-to-video. Supports integer values or numeric strings from 3 to 15. Ignored and not forwarded in motion-control.

sound · boolean · default: "true"

For text-to-video and image-to-video, controls whether Kling generates audio with the video. For motion-control, controls whether the reference video’s original audio is retained.

aspect_ratio · string · default: "16:9"

Output aspect ratio for text-to-video only. Supported values: 1:1, 9:16, 16:9.

cfg_scale · number

Guidance scale for text-to-video and image-to-video. Supported range: 0 to 1.

image_urls · string[]

Reference image URLs. Required for image-to-video and motion-control. image-to-video supports 1-2 images; motion-control requires exactly 1 image. Upstream expects JPG, JPEG, or PNG images, with each image under 10 MB.

video_urls · string[]

Required for motion-control only. Provide exactly 1 public HTTP/HTTPS MP4, MOV, or M4V URL. APIXO probes video_urls[0] to detect duration; videos over 30 seconds are rejected.

character_orientation · string

motion-control only. Supported values: image, video. Determines whether character orientation follows the character image or the motion reference video.

multi_prompt · object[]

Optional shot-level prompt segments for text-to-video and image-to-video. Each item must include a non-empty prompt and a duration integer or numeric string. multi_prompt does not affect billing.

Response format

Submit task response

POST /generateTask/kling-3-0-std returns a task ID when the task is accepted:

code · integer

API status code. 200 means the task was accepted.

message · string

Human-readable status message.

data.taskId · string

Unique task identifier used with the status endpoint.

Status response fields

taskId · string

Unique task identifier.

state · string

Current task state: pending, processing, success, or failed.

resultJson · string

JSON string containing the generated video URLs. Present when state is success.

failCode · string

Machine-readable failure code. Present when state is failed.

failMsg · string

Human-readable failure message. Present when state is failed.

createTime · integer

Task creation timestamp in Unix milliseconds.

completeTime · integer

Task completion timestamp in Unix milliseconds. Present after completion.

costTime · integer

Processing duration in milliseconds. Present after successful completion.

Webhook callback mode

Use callback mode when your backend should receive the final result automatically instead of polling.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/kling-3-0-std" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/webhooks/apixo",
    "input": {
      "mode": "image-to-video",
      "prompt": "animate the product photo with a slow studio camera move",
      "duration": 5,
      "sound": true,
      "image_urls": [
        "https://example.com/product.png"
      ]
    }
  }'

See Webhooks for delivery requirements and retry behavior.

Billing

Kling 3.0 Std is billed per generated video second. For text-to-video and image-to-video, the selected sound value determines the unit price. For motion-control, APIXO probes the reference video duration and uses a minimum of 3 billable seconds.

Workflow	Billing input	APIXO price
text-to-video or image-to-video, sound: false	duration seconds	$0.084 / second
text-to-video or image-to-video, sound: true	duration seconds	$0.13 / second
motion-control	Detected video_urls[0] duration, minimum 3 seconds	$0.13 / second

For current route and market comparison pricing, see Pricing.

Latency and polling

Actual latency may vary by prompt complexity, reference media, sound generation, route, and current queue load.

Request shape	Typical generation time	Recommended first poll	Poll interval
3-5 second text/image video	60s-90s	60s after task creation	5s-10s
6-10 second text/image video	90s-120s	60s after task creation	5s-10s
11-15 second text/image video	120s-180s	60s after task creation	5s-10s
Motion-control	Varies with reference video duration and probing	60s after task creation	5s-10s

Video generation takes longer than image generation. For production workloads, use callback mode to avoid frequent polling.

Rate limits and concurrency can vary by account, API key, and route. If you receive 429, slow down requests and retry with backoff. For account-level details, see System APIs.

Errors and troubleshooting

HTTP errors

Code	Meaning	What to do
400	Invalid request body, mode, parameter, image URL, or video URL	Fix the request before retrying
401	Missing or invalid API key	Check the Authorization header
402	Insufficient balance or quota	Add balance or switch account/key
403	Key or route cannot access the model	Check permissions and route strategy
429	Rate limit or concurrency limit reached	Retry with exponential backoff
500	Server error	Retry with backoff
502	Upstream error	Retry with backoff
504	Upstream timeout	Retry or use callback mode for long-running jobs

Task failure codes

Fail code	Meaning	What to do
CONTENT_VIOLATION	Prompt or reference media failed safety checks	Change the prompt or input media
INVALID_IMAGE_URL	A reference image URL could not be fetched or decoded	Use a public, direct JPG, JPEG, or PNG URL
INVALID_VIDEO_URL	A reference video URL could not be fetched, decoded, or probed	Use a public MP4, MOV, or M4V URL
INVALID_PARAMETER	A model parameter is unsupported or malformed	Check mode, duration, sound, aspect_ratio, image_urls, and video_urls
INSUFFICIENT_BALANCE	The account does not have enough balance for the task	Add balance before retrying
UPSTREAM_ERROR	Upstream failure	Retry with backoff
TIMEOUT	Generation did not finish in time	Retry, simplify inputs, or use callback mode

Common fixes

Symptom	Fix
Request fails with invalid mode	Set input.mode to text-to-video, image-to-video, or motion-control
Unexpected audio cost	sound defaults to true; set sound: false for text/image video without generated audio
duration has no effect in motion-control	This mode detects duration from video_urls[0] and does not forward duration
Aspect ratio has no effect	aspect_ratio is only forwarded for text-to-video
Video URL probe fails	Use a direct public HTTP/HTTPS MP4, MOV, or M4V URL that supports range reads or full download
Motion-control video is rejected	Keep the reference video at 30 seconds or shorter

See Error Codes for the full error reference.

Related links

• Generation API Overview
• Video Models
• Generate Task
• Status Task
• Webhooks
• Error Codes
• Parameter Specification
• Routing Strategies
• Try Kling 3.0 Std in the APIXO Playground
• Pricing