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HappyHorse text-to-video API reference ​

Reference, synced 2026-06-13.

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Generate physically realistic, motion-smooth video from text prompts with the HappyHorse model.

Availability ​

The model, endpoint URL, and API key must belong to the same region. Cross-region calls fail.

  • Select a model: Check which region the model belongs to.

  • Select a URL: Use the region's endpoint URL. HTTP is supported.

  • Configure an API key: Get an API key for the region, and then Export API key as environment variable.

Note

The sample code in this topic applies to the Singapore region.

Important

The legacy domain https://dashscope-intl.aliyuncs.com for the Singapore region will be deprecated soon. Please migrate to the new domain https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com as soon as possible.

HTTP request ​

Text-to-video tasks typically take 1 to 5 minutes. The API uses asynchronous calls with two steps: "Create a task → Poll for results".

Step 1: Create a task and get the task ID ​

Singapore

US (Virginia)

China (Beijing)

Germany (Frankfurt)

POST https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/services/aigc/video-generation/video-synthesis

Replace WorkspaceId with your actual Workspace ID.

POST https://dashscope-us.aliyuncs.com/api/v1/services/aigc/video-generation/video-synthesis

POST https://dashscope.aliyuncs.com/api/v1/services/aigc/video-generation/video-synthesis

POST https://{WorkspaceId}.eu-central-1.maas.aliyuncs.com/api/v1/services/aigc/video-generation/video-synthesis

Replace WorkspaceId with your actual Workspace ID.

Note

  • After the task is created, use the returned task_id to query the result. The task_id is valid for 24 hours. Do not create duplicate tasks. Instead, use polling to retrieve the result.

  • For guidance for beginners, see Postman.

#### Request parametersText-to-video curl curl --location 'https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/services/aigc/video-generation/video-synthesis' \ -H 'X-DashScope-Async: enable' \ -H "Authorization: Bearer $DASHSCOPE_API_KEY" \ -H 'Content-Type: application/json' \ -d '{ "model": "happyhorse-1.0-t2v", "input": { "prompt": "A miniature city built from cardboard and bottle caps comes to life at night. A cardboard train slowly passes through, with small lights dotting the scene and illuminating the way ahead." }, "parameters": { "resolution": "720P", "ratio": "16:9", "duration": 5 } }'
Content-Typestring (Required) The content type of the request. Must be application/json.
Authorizationstring (Required) Authenticates the request with a Model Studio API key. Example: Bearer sk-xxxx.
X-DashScope-Asyncstring (Required) Enables asynchronous processing. HTTP requests support only asynchronous calls. Must be enable. Important If this request header is missing, the error "current user api does not support synchronous calls" is returned.
##### Request body
modelstring (Required) Model for video generation. Valid values: - happyhorse-1.0-t2v
inputobject (Required) Model input. Properties promptstring (Required) Text description of the video to generate. Supports any language. Maximum 5,000 non-Chinese characters or 2,500 Chinese characters. Excess is truncated.
parametersobject (Optional) Video output settings (resolution, aspect ratio, duration). Properties resolutionstring (Optional) Output video resolution. Valid values: - 720P - 1080P (default) ratiostring (Optional) Output video aspect ratio. Valid values: - 16:9 (default) - 9:16 - 1:1 - 4:3 - 3:4 - 4:5 - 5:4 - 9:21 - 21:9 durationinteger (Optional) Output video duration in seconds. - happyhorse-1.0-t2v: 3–15. Default: 5. watermarkboolean (Optional) Whether to add a watermark. Displays "HappyHorse" in the lower-right corner. - true (default) - false seedinteger (Optional) The random number seed must be an integer in the range [0, 2147483647]. If not specified, a random seed is generated. A fixed seed improves reproducibility. Because model generation is probabilistic, the same seed does not guarantee identical results.
#### Response parametersSuccessful response Error response Save the task_id to query the task status and result. json { "output": { "task_status": "PENDING", "task_id": "0385dc79-5ff8-4d82-bcb6-xxxxxx" }, "request_id": "4909100c-7b5a-9f92-bfe5-xxxxxx" } Task creation failed. See Error codes. json { "code": "InvalidApiKey", "message": "No API-key provided.", "request_id": "7438d53d-6eb8-4596-8835-xxxxxx" }
outputobject Task output information. Properties task_idstring The task ID. Valid for queries for 24 hours. task_statusstring The status of the task. Enumeration values - PENDING - RUNNING - SUCCEEDED - FAILED - CANCELED - UNKNOWN: The task does not exist or its status is unknown.
request_idstring Unique request identifier for tracing and troubleshooting.
codestring Error code. Returned only for failed requests. See Error codes.
messagestring Detailed error message. Returned only for failed requests. See Error codes.

Step 2: Query the result by task ID ​

Singapore

US (Virginia)

China (Beijing)

Germany (Frankfurt)

GET https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/tasks/{task_id}

Replace WorkspaceId with your actual Workspace ID.

GET https://dashscope-us.aliyuncs.com/api/v1/tasks/{task_id}

GET https://dashscope.aliyuncs.com/api/v1/tasks/{task_id}

GET https://{WorkspaceId}.eu-central-1.maas.aliyuncs.com/api/v1/tasks/{task_id}

Replace WorkspaceId with your actual Workspace ID.

Note

  • Polling recommendation: Video generation takes several minutes. Use a polling mechanism with a reasonable interval, such as 15 seconds.

  • Task state transition: PENDING → RUNNING → SUCCEEDED or FAILED.

  • Result link: After a task succeeds, a video URL valid for 24 hours is returned. Download and save the video to permanent storage, such as OSS.

  • task_id validity: 24 hours. After this period, queries return the task status as UNKNOWN.

#### Request parametersQuery task result Replace {task_id} with the task_id value returned by the previous API call. The task_id is valid for queries for 24 hours. curl curl -X GET https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/tasks/{task_id} \ --header "Authorization: Bearer $DASHSCOPE_API_KEY"
##### Headers
Authorizationstring (Required) Authenticates the request with a Model Studio API key. Example: Bearer sk-xxxx.
##### Path parameters
task_idstring (Required) The ID of the task.
#### Response parametersTask succeeded Task failed Task query expired Video URLs are valid for only 24 hours and then automatically purged. Save generated videos promptly. json { "request_id": "99243b47-ec5f-9413-9993-xxxxxx", "output": { "task_id": "4673458e-28be-4a05-bf2a-xxxxxx", "task_status": "SUCCEEDED", "submit_time": "2026-04-20 17:55:17.075", "scheduled_time": "2026-04-20 17:55:17.129", "end_time": "2026-04-20 17:56:36.658", "orig_prompt": "A miniature city built from cardboard and bottle caps comes to life at night. A cardboard train slowly passes through, with small lights dotting the scene and illuminating the way ahead.", "video_url": "https://dashscope-result.oss-cn-beijing.aliyuncs.com/xxx.mp4?Expires=xxx" }, "usage": { "duration": 5, "input_video_duration": 0, "output_video_duration": 5, "video_count": 1, "SR": 720, "ratio": "16:9" } } When a task fails, task_status is FAILED with an error code and message. See Error codes. json { "request_id": "e5d70b02-ebd3-98ce-9fe8-759d7d7b107d", "output": { "task_id": "86ecf553-d340-4e21-af6e-a0c6a421c010", "task_status": "FAILED", "code": "InvalidParameter", "message": "The parameter is invalid." } } The task_id is valid for 24 hours. After this period, queries return the following error. json { "request_id": "a4de7c32-7057-9f82-8581-xxxxxx", "output": { "task_id": "502a00b1-19d9-4839-a82f-xxxxxx", "task_status": "UNKNOWN" } }
outputobject Task output information. Properties task_idstring The task ID. Valid for queries for 24 hours. task_statusstring The status of the task. Enumeration values - PENDING - RUNNING - SUCCEEDED - FAILED - CANCELED - UNKNOWN: The task does not exist or its status is unknown. State transitions during polling: - PENDING → RUNNING → SUCCEEDED or FAILED. - The initial query status is usually PENDING or RUNNING. - When the status changes to SUCCEEDED, the response contains the generated video URL. - If the status is FAILED, check the error message and retry the task. submit_timestring The time when the task was submitted. The time is in UTC+8 and the format is YYYY-MM-DD HH:mm:ss.SSS. scheduled_timestring The time when the task was executed. The time is in UTC+8 and the format is YYYY-MM-DD HH:mm:ss.SSS. end_timestring The time when the task was completed. The time is in UTC+8 and the format is YYYY-MM-DD HH:mm:ss.SSS. video_urlstring URL of the generated video. Returned only when task_status is SUCCEEDED. Valid for 24 hours. The video is in MP4 format with H.264 encoding. orig_promptstring The original input prompt, corresponding to the request parameter prompt. codestring Error code. Returned only for failed requests. See Error codes. messagestring Detailed error message. Returned only for failed requests. See Error codes.
usageobject Output statistics. Only successful tasks are counted. Properties input_video_durationinteger Input video duration in seconds. output_video_durationinteger Output video duration in seconds. durationinteger Total video duration for billing. SRinteger Output video resolution. ratiostring Output video aspect ratio. video_countinteger Number of output videos. Always 1.
request_idstring Unique request identifier for tracing and troubleshooting.

Error codes ​

Failed API calls return error codes documented in Error messages.

Previous: Image API FAQNext: HappyHorse image-to-video (first frame)

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Availability

HTTP request

Step 1: Create a task and get the task ID

Step 2: Query the result by task ID

Error codes

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