> ## Documentation Index > Fetch the complete documentation index at: https://evolink.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Wan3.0 Image-to-Video > - Pass `image_start` to strictly set the video's **first frame**; add `image_end` to strictly set the **last frame** as well - **Reference material is not accepted** (reference videos / reference audio / files / web pages): first-and-last frames and reference material are mutually exclusive. For mixed references, use [Wan3.0 Reference-to-Video](/en/api-manual/video-series/wan3.0/wan3.0-reference-video) instead - At most 2 images (first frame + last frame). For 3 or more reference images, use Reference-to-Video - Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated video links are valid for 24 hours, please save them promptly ## Billing - **Billing formula**: billed duration = input video duration + output video duration, billed per second - **Resolution multiplier**: `480p` = 1x (baseline), `720p` = 2x, `1080p` = 4x - Reference images, reference audio, reference files and web page links are **not billed** - When `duration` is `-1` (smart duration), credits are pre-authorized at the `30`-second cap; once the task succeeds it is settled against the actual output duration and the difference is refunded automatically - Turning the `audio` track on or off **costs the same** - **Failed tasks are not billed**, the frozen credits are refunded in full ## OpenAPI ````yaml en/api-manual/video-series/wan3.0/wan3.0-image-to-video.json POST /v1/videos/generations openapi: 3.1.0 info: title: Wan3.0 Image-to-Video API description: >- Wan 3.0 image-to-video: strictly control where the video starts and ends with a first frame or a first-and-last-frame pair license: name: MIT version: 1.0.0 servers: - url: https://api.evolink.ai description: Production security: - bearerAuth: [] tags: - name: Video Generation description: AI video generation endpoints paths: /v1/videos/generations: post: tags: - Video Generation summary: Wan3.0 Image-to-Video description: >- - Pass `image_start` to strictly set the video's **first frame**; add `image_end` to strictly set the **last frame** as well - **Reference material is not accepted** (reference videos / reference audio / files / web pages): first-and-last frames and reference material are mutually exclusive. For mixed references, use [Wan3.0 Reference-to-Video](/en/api-manual/video-series/wan3.0/wan3.0-reference-video) instead - At most 2 images (first frame + last frame). For 3 or more reference images, use Reference-to-Video - Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated video links are valid for 24 hours, please save them promptly ## Billing - **Billing formula**: billed duration = input video duration + output video duration, billed per second - **Resolution multiplier**: `480p` = 1x (baseline), `720p` = 2x, `1080p` = 4x - Reference images, reference audio, reference files and web page links are **not billed** - When `duration` is `-1` (smart duration), credits are pre-authorized at the `30`-second cap; once the task succeeds it is settled against the actual output duration and the difference is refunded automatically - Turning the `audio` track on or off **costs the same** - **Failed tasks are not billed**, the frozen credits are refunded in full operationId: createWan30ImageToVideo requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VideoGenerationRequest' examples: first_frame: summary: First-frame to video value: model: wan3.0-image-to-video prompt: >- The boy in the frame “comes alive” out of the wall and performs an English rap at breakneck speed, while street lights under a railway bridge at night create a cinematic mood. image_start: https://example.com/first_frame.png duration: 5 quality: 720p first_last_frame: summary: First-and-last-frame to video value: model: wan3.0-image-to-video prompt: >- A young girl's smile gradually turns into a big laugh, the camera slowly pushes in, and the background light shifts from cool tones to warm tones. image_start: https://example.com/first_frame.jpg image_end: https://example.com/last_frame.jpg duration: 5 quality: 720p aspect_ratio: '16:9' responses: '200': description: Video generation task created successfully content: application/json: schema: $ref: '#/components/schemas/VideoGenerationResponse' '400': description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: invalid_parameter message: Invalid request parameters type: invalid_request_error '401': description: Unauthenticated, invalid or expired token content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: unauthorized message: Invalid or expired token type: authentication_error '402': description: Insufficient quota, recharge required content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: insufficient_quota message: Insufficient quota. Please top up your account. type: insufficient_quota '403': description: Access denied content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: model_access_denied message: 'Token does not have access to model: wan3.0-image-to-video' type: invalid_request_error '429': description: Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: rate_limit_exceeded message: Too many requests, please try again later type: rate_limit_error '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: internal_error message: Internal server error type: api_error components: schemas: VideoGenerationRequest: type: object required: - model - image_start properties: model: type: string description: Model name, fixed to `wan3.0-image-to-video` enum: - wan3.0-image-to-video example: wan3.0-image-to-video default: wan3.0-image-to-video prompt: type: string description: >- Text prompt for video generation. Chinese and English are supported, **each Chinese character / letter counts as 1 character**, maximum length `20000` characters; anything beyond that is truncated automatically (no error) Use it to describe the action, camera movement and visual changes expected between the first frame (or the first and last frames). example: >- A young girl's smile gradually turns into a big laugh, the camera slowly pushes in, and the background light shifts from cool tones to warm tones. image_start: type: string format: uri description: >- First-frame image URL, used strictly as the first frame of the generated video. **Required** **Image limits:** - Formats: JPEG, JPG, PNG (transparency not supported), BMP, WEBP - Resolution: width and height in `[240, 8000]` pixels - Aspect ratio: 1:8 ~ 8:1 - File size: up to `20MB` example: https://example.com/first_frame.jpg image_end: type: string format: uri description: >- Last-frame image URL, used strictly as the last frame of the generated video. Optional **Constraint:** must be used together with `image_start`, **passing the last frame alone is not supported**. **Image limits:** - Formats: JPEG, JPG, PNG (transparency not supported), BMP, WEBP - Resolution: width and height in `[240, 8000]` pixels - Aspect ratio: 1:8 ~ 8:1 - File size: up to `20MB` example: https://example.com/last_frame.jpg duration: type: integer description: >- Duration of the generated video in seconds, defaults to `5` **Accepted values:** - Any integer between `2` and `30` - `-1`: smart duration, the model decides the output length from the prompt and the input material **How smart duration is billed:** the output length cannot be known at submission time, so credits are pre-authorized at the `30`-second **cap**; once the task succeeds it is settled against the actual output duration and the excess hold is released automatically. If your balance cannot cover the capped hold, pass an explicit number of seconds instead. default: 5 example: 5 quality: type: string description: >- Video resolution, defaults to `720p` **Options:** - `480p`: lower definition, lowest price (billing baseline) - `720p`: standard definition, this is the default, 2x the price of `480p` - `1080p`: high definition, 4x the price of `480p` enum: - 480p - 720p - 1080p default: 720p example: 720p aspect_ratio: type: string description: >- Video aspect ratio, defaults to `adaptive` **Options:** - `adaptive`: adaptive, the model recommends a suitable aspect ratio based on the input material's ratio and the intent of the prompt, this is the default - `16:9` (landscape), `9:16` (portrait), `1:1` (square), `4:3`, `3:4` enum: - adaptive - '16:9' - '9:16' - '1:1' - '4:3' - '3:4' default: adaptive example: '16:9' generate_audio: type: boolean description: >- Whether the output video contains an audio track, defaults to `true` **Options:** - `true`: the output video contains sound (voices, sound effects, background music), this is the default - `false`: silent video output **Sound on and sound off cost the same**, there is no extra charge. default: true example: true seed: type: integer description: >- Random seed, used to reproduce generation results, random by default **Notes:** - Range: `0` ~ `2147483647` - Fixing the seed reduces variation when iterating on prompts and improves reproducibility minimum: 0 maximum: 2147483647 example: 42 callback_url: type: string description: >- HTTPS callback URL for task completion **Callback timing:** - Triggered when the task is completed, failed, or cancelled - Sent after billing confirmation is complete **Security restrictions:** - Only HTTPS protocol is supported - Callbacks to private 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 `2048` characters **Callback mechanism:** - Timeout: `10` seconds - Up to `3` retries after failure (at `1`/`2`/`4` seconds after failure respectively) - Callback response body format is consistent with the task query endpoint response format - A 2xx status code is considered successful; other status codes trigger retries format: uri example: https://your-domain.com/webhooks/video-task-completed VideoGenerationResponse: type: object properties: created: type: integer description: Task creation timestamp example: 1761313744 id: type: string description: Task ID example: task-unified-1774857405-abc123 model: type: string description: Actual model name used example: wan3.0-image-to-video object: type: string enum: - video.generation.task description: Specific task type progress: type: integer description: Task progress percentage (0-100) minimum: 0 maximum: 100 example: 0 status: type: string description: Task status enum: - pending - processing - completed - failed example: pending task_info: $ref: '#/components/schemas/VideoTaskInfo' description: Video task details type: type: string enum: - text - image - audio - video description: Task output type example: video usage: $ref: '#/components/schemas/VideoUsage' description: Usage and billing information ErrorResponse: type: object properties: error: type: object properties: code: type: string description: Error code identifier message: type: string description: Error description type: type: string description: Error type VideoTaskInfo: type: object properties: can_cancel: type: boolean description: Whether the task can be cancelled example: true estimated_time: type: integer description: Estimated completion time (seconds) minimum: 0 example: 165 video_duration: type: integer description: Video duration (seconds) example: 8 VideoUsage: type: object description: Usage and billing information properties: billing_rule: type: string description: Billing rule enum: - per_call - per_token - per_second example: per_second credits_reserved: type: number description: Estimated credits consumed minimum: 0 example: 50 user_group: type: string description: User group category example: default securitySchemes: bearerAuth: type: http scheme: bearer description: >- ##All endpoints require Bearer Token authentication## **Get API Key:** Visit the [API Key Management Page](https://evolink.ai/dashboard/keys) to obtain your API Key **Add to request header:** ``` Authorization: Bearer YOUR_API_KEY ``` ````