Wan 2.7 Video Extend API Reference

Request body

Submit an async generation request. The model field selects the model; other fields are model-specific input parameters.

stringmodelrequired

Model identifier. Set to alibaba/wan/2.7/video-extend.

Default: alibaba/wan/2.7/video-extend

stringpromptrequired

What happens after the source clip ends: action, camera movement, scene progression, and sound. Up to 5,000 characters.

stringvideorequired

URL of the source clip to continue (MP4 or MOV, 2-10 seconds, 240-4096px per side, up to 100MB).

Optional<string>end_image

Optional last frame the continuation should end on (JPEG, PNG, BMP, or WebP; 240-8000px per side, up to 20MB).

Optional<integer>duration

Total length of the output in seconds, including the source clip (2-15). For a 3-second source and duration 10, the model adds 7 seconds. Must be longer than the source clip.

Allowed values: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15

Default: 5

Optional<string>resolution

The resolution of the video to generate.

Allowed values: 720p, 1080p

Default: 720p

Optional<integer>seed

Random seed (0-2147483647) for reproducible results. Omit for a random seed.

Range: 0 to 2147483647

Response Schema

The submit endpoint returns a run response. If its status is pending or running, poll GET /v1/run/{id} with the returned opaque ID until it reaches a terminal state.

stringidrequired

Opaque SandBase run identifier. Use it exactly as returned; no prefix is guaranteed.

stringstatusrequired

Current public run status.

Allowed values: pending, running, completed, failed, timeout

Optional<string>model

Public SandBase model name used for this run.

Optional<array<object>>outputs

Present only for completed runs. Each object is capability-specific; inspect the selected model schema for its fields.

Optional<object>error

Present only for failed or timeout runs. Contains a public error type and sanitized message.

Optional<string>error.type

Stable public error category.

Optional<string>error.message

Sanitized error message safe to show to clients.

Optional<object>usage

Usage details when available.

Model capabilities

array<string>capability_tagsrequired

Capabilities declared by the model registry.

Default: video-to-video

stringexecution_moderequired

Execution mode declared by the model registry.

Default: async

# 1. Submit a generation request curl -X POST https://api.sandbase.ai/v1/run \ -H "Authorization: Bearer $SANDBASE_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "alibaba/wan/2.7/video-extend", "prompt": "A girl takes a selfie in the mirror, then picks up her backpack and walks out of the room.", "video": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260129/hfugmr/wan-r2v-role1.mp4", "duration": 5 }' # 2. If the response is still running, poll the returned id curl https://api.sandbase.ai/v1/run/f3d2e8a1-7c4b-4a12-9d2e-123456789abc \ -H "Authorization: Bearer $SANDBASE_API_KEY"