curl --request POST \
--url https://api.evolink.ai/v1/videos/generations \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"model": "kling-o3-text-to-video",
"prompt": "A cat running on a grassy field under bright sunshine",
"duration": 5,
"aspect_ratio": "16:9",
"quality": "720p"
}
'{
"created": 1757169743,
"id": "task-unified-1757169743-7cvnl5zw",
"model": "kling-o3-text-to-video",
"object": "video.generation.task",
"progress": 0,
"status": "pending",
"task_info": {
"can_cancel": true,
"estimated_time": 300,
"video_duration": 9
},
"type": "video",
"usage": {
"billing_rule": "per_call",
"credits_reserved": 7,
"user_group": "default"
}
}{
"error": {
"code": "invalid_request",
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}{
"error": {
"code": "unauthorized",
"message": "Invalid or expired token",
"type": "authentication_error"
}
}{
"error": {
"code": "insufficient_quota",
"message": "Insufficient quota. Please top up your account.",
"type": "insufficient_quota"
}
}{
"error": {
"code": "model_access_denied",
"message": "Token does not have access to model: kling-o3-text-to-video",
"type": "invalid_request_error"
}
}{
"error": {
"code": "rate_limit_exceeded",
"message": "Too many requests, please try again later",
"type": "rate_limit_error"
}
}{
"error": {
"code": "internal_error",
"message": "Internal server error",
"type": "api_error"
}
}Kling-O3
Kling-O3 Text to Video
- Kling-O3 Text to Video (kling-o3-text-to-video) pure text-driven video generation, based on Kling AI kling-v3-omni model
- Supports single-shot and multi-shot modes, can generate videos with sound effects
- Asynchronous processing mode, use the returned task ID to query status
- Generated video links are valid for 24 hours, please save them promptly
POST
/
v1
/
videos
/
generations
curl --request POST \
--url https://api.evolink.ai/v1/videos/generations \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"model": "kling-o3-text-to-video",
"prompt": "A cat running on a grassy field under bright sunshine",
"duration": 5,
"aspect_ratio": "16:9",
"quality": "720p"
}
'{
"created": 1757169743,
"id": "task-unified-1757169743-7cvnl5zw",
"model": "kling-o3-text-to-video",
"object": "video.generation.task",
"progress": 0,
"status": "pending",
"task_info": {
"can_cancel": true,
"estimated_time": 300,
"video_duration": 9
},
"type": "video",
"usage": {
"billing_rule": "per_call",
"credits_reserved": 7,
"user_group": "default"
}
}{
"error": {
"code": "invalid_request",
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}{
"error": {
"code": "unauthorized",
"message": "Invalid or expired token",
"type": "authentication_error"
}
}{
"error": {
"code": "insufficient_quota",
"message": "Insufficient quota. Please top up your account.",
"type": "insufficient_quota"
}
}{
"error": {
"code": "model_access_denied",
"message": "Token does not have access to model: kling-o3-text-to-video",
"type": "invalid_request_error"
}
}{
"error": {
"code": "rate_limit_exceeded",
"message": "Too many requests, please try again later",
"type": "rate_limit_error"
}
}{
"error": {
"code": "internal_error",
"message": "Internal server error",
"type": "api_error"
}
}Authorizations
All APIs require Bearer Token authentication
Get API Key:
Visit API Key Management Page to get your API Key
Add to request header:
Authorization: Bearer YOUR_API_KEY
Body
application/json
Video generation model name
Available options:
kling-o3-text-to-video Example:
"kling-o3-text-to-video"
Text prompt describing what video to generate
Note:
- Maximum
2500characters - Can be empty when
multi_shot=trueandshot_type=customize - You can reference elements using
<<<element_1>>>syntax
Maximum string length:
2500Example:
"A cat running on a grassy field under bright sunshine"
Video duration in seconds, defaults to 5 seconds
Note:
- Supports integers from
3to15 - Billing is based on the
durationvalue, longer duration costs more
Required range:
3 <= x <= 15Example:
5
Video aspect ratio
Options:
16:9: Landscape video9:16: Portrait video1:1: Square video
Available options:
16:9, 9:16, 1:1 Example:
"16:9"
Resolution quality
Options:
720p: Standard 720P1080p: High quality 1080P4k: Ultra-high definition 4K
Available options:
720p, 1080p, 4k Example:
"720p"
Sound effect control
Options:
on: Enable sound effectsoff: Disable sound effects
Available options:
on, off Example:
"off"
Model extension parameters
Constraint: Maximum 7 elements
Show child attributes
Show child attributes
HTTPS callback URL for task completion
Callback Timing:
- Triggered when task is completed, failed, or cancelled
- Sent after billing confirmation
Security Restrictions:
- HTTPS protocol only
- Internal IP addresses are prohibited (127.0.0.1, 10.x.x.x, 172.16-31.x.x, 192.168.x.x, etc.)
- URL length must not exceed
2048characters
Callback Mechanism:
- Timeout:
10seconds - Maximum
3retries after failure (at1/2/4seconds after failure) - Callback response format is consistent with task query API
- 2xx status code is considered successful, other codes trigger retry
Example:
"https://your-domain.com/webhooks/video-task-completed"
Response
Video generation task created successfully
Task creation timestamp
Example:
1757169743
Task ID
Example:
"task-unified-1757169743-7cvnl5zw"
Actual model name used
Example:
"kling-o3-text-to-video"
Task type
Available options:
video.generation.task Task progress percentage (0-100)
Required range:
0 <= x <= 100Example:
0
Task status
Available options:
pending, processing, completed, failed Example:
"pending"
Video task details
Show child attributes
Show child attributes
Task output type
Available options:
text, image, audio, video Example:
"video"
Usage and billing information
Show child attributes
Show child attributes