> ## Documentation Index > Fetch the complete documentation index at: https://apixo.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # MiniMax H3 API > MiniMax H3 2k video generation API with text-to-video, image-to-video, and reference-to-video workflows ## Overview MiniMax H3 generates 2k videos from prompts, first-frame or first-and-last-frame images, and multimodal reference inputs. Use this page when you are ready to call the API after trying the model in the APIXO playground. | Capability | Value | | --------------------- | ------------------------------------------------------------------------------------ | | Model ID | `minimax-h3` | | Modes | `text-to-video`, `image-to-video`, `reference-to-video` | | Prompt | Required non-empty string, up to 4,000 characters | | Output resolution | Fixed `2k` | | Output duration | Any integer from `5` through `15` seconds; defaults to `5` | | Aspect ratios | `21:9`, `16:9`, `4:3`, `1:1`, `3:4`, `9:16` for text-to-video and reference-to-video | | Image-to-video images | 1-2 image URLs; the second image is the optional last frame | | Reference inputs | Up to 9 image URLs, 3 video URLs, and 3 audio URLs for reference-to-video | | Result format | MP4 URL array in `resultJson.resultUrls` | ## Endpoint and authentication Base URL: ```text theme={null} https://api.apixo.ai/api/v1 ``` | Method | Endpoint | Purpose | | ------ | ---------------------------------------- | ------------------------------------- | | `POST` | `/generateTask/minimax-h3` | Submit a generation task | | `GET` | `/statusTask/minimax-h3?taskId={taskId}` | Poll task status and retrieve results | All requests require your APIXO API key: ```http theme={null} Authorization: Bearer YOUR_API_KEY ``` Submit requests also require: ```http theme={null} Content-Type: application/json ``` ## Copy-paste async quickstart This minimal request submits a text-to-video task and returns a `taskId`. ```bash theme={null} curl -X POST "https://api.apixo.ai/api/v1/generateTask/minimax-h3" \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "request_type": "async", "input": { "mode": "text-to-video", "prompt": "a cinematic product reveal with smooth camera movement and premium studio lighting", "aspect_ratio": "16:9", "resolution": "2k", "duration": 8 } }' ``` Successful response: ```json theme={null} { "code": 200, "message": "success", "data": { "taskId": "task_12345678" } } ``` Save the `taskId`; you need it to poll for the final result. ## Poll for result ```bash theme={null} curl -X GET "https://api.apixo.ai/api/v1/statusTask/minimax-h3?taskId=task_12345678" \ -H "Authorization: Bearer YOUR_API_KEY" ``` Processing response: ```json theme={null} { "code": 200, "message": "success", "data": { "taskId": "task_12345678", "state": "processing", "createTime": 1767965610929 } } ``` Success response: ```json theme={null} { "code": 200, "message": "success", "data": { "taskId": "task_12345678", "state": "success", "resultJson": "{\"resultUrls\":[\"https://file.apixo.ai/video.mp4\"]}", "createTime": 1767965610929, "completeTime": 1767965790929, "costTime": 180000 } } ``` Failed response: ```json theme={null} { "code": 200, "message": "success", "data": { "taskId": "task_12345678", "state": "failed", "failCode": "UPSTREAM_ERROR", "failMsg": "Generation failed", "createTime": 1767965610929, "completeTime": 1767965620132 } } ``` Parse `resultJson` after `state` becomes `success`: ```javascript theme={null} const payload = JSON.parse(data.resultJson); const videoUrls = payload.resultUrls; ``` ## Request body ### Text-to-video ```json theme={null} { "request_type": "async", "input": { "mode": "text-to-video", "prompt": "a cinematic night street in Tokyo with rain reflections and slow camera movement", "aspect_ratio": "16:9", "resolution": "2k", "duration": 10 } } ``` ### Image-to-video ```json theme={null} { "request_type": "async", "input": { "mode": "image-to-video", "prompt": "animate this portrait with subtle head movement and cinematic lighting", "image_urls": [ "https://example.com/first-frame.png", "https://example.com/last-frame.png" ], "resolution": "2k", "duration": 8 } } ``` ### Reference-to-video ```json theme={null} { "request_type": "async", "input": { "mode": "reference-to-video", "prompt": "create a polished product launch video using the visual references and camera motion", "image_urls": [ "https://example.com/ref-01.png", "https://example.com/ref-02.png", "https://example.com/ref-03.png", "https://example.com/ref-04.png", "https://example.com/ref-05.png", "https://example.com/ref-06.png" ], "video_urls": [ "https://example.com/motion-reference.mp4" ], "audio_urls": [ "https://example.com/voice-reference.mp3" ], "aspect_ratio": "16:9", "resolution": "2k", "duration": 8 } } ``` ## Parameters Result delivery mode. Omit this field or use `async` for polling with `statusTask`, or use `callback` for webhook delivery. Required when `request_type` is `callback`. Must be a public HTTPS URL that can receive the final task payload. See [Webhooks](/docs/api-reference/webhooks). MiniMax H3 input parameters. Generation mode. Supported values: `text-to-video`, `image-to-video`, `reference-to-video`. Text prompt describing the desired video. The backend trims whitespace, rejects empty prompts, and allows up to 4,000 characters. Output resolution. Only `2k` is supported. Output duration in seconds. Supports integers from `5` through `15`, including numeric strings such as `"8"`. Output aspect ratio for `text-to-video` and `reference-to-video`. Supported values: `21:9`, `16:9`, `4:3`, `1:1`, `3:4`, `9:16`. Image-to-video ignores this field. Image URLs. Required for `image-to-video` with 1-2 images, where `image_urls[0]` is the first frame and `image_urls[1]` is the optional last frame. Optional for `reference-to-video` with up to 9 images. Reference video URLs for `reference-to-video`. Supports up to 3 URLs when provided. Each video must be 2-15 seconds, and total reference video duration cannot exceed 15 seconds. Reference audio URLs for `reference-to-video`. Supports up to 3 URLs when provided. Each audio file must be 2-15 seconds, and total reference audio duration cannot exceed 15 seconds. Audio cannot be used alone. | Mode | Required media | Optional media | Billing note | | -------------------- | ------------------------------------- | ---------------------------------------- | --------------------------------------------------------------------------------------------------------------------------- | | `text-to-video` | None | None | Output duration is billed per second. | | `image-to-video` | `image_urls` with 1-2 images | None | Output duration is billed per second. | | `reference-to-video` | At least one image or video reference | `image_urls`, `video_urls`, `audio_urls` | Output duration and reference video seconds are billed per second; reference images after the first 5 are billed per image. | In `reference-to-video`, image, video, and audio arrays do not need to have matching counts. For example, 6 images with no video or audio is valid. Audio-only reference-to-video requests are rejected. If you provide `audio_urls`, include at least one `image_urls` or `video_urls` reference. Use public, directly accessible URLs for all reference media. Video and audio durations are checked before the task is submitted. ## Response format ### Submit task response `POST /generateTask/minimax-h3` returns a task ID when the task is accepted: API status code. `200` means the task was accepted. Human-readable status message. Unique task identifier used with the status endpoint. ### Status response fields Unique task identifier. Current task state: `processing`, `success`, or `failed`. JSON string containing generated video URLs in `resultUrls`. Present when `state` is `success`. Machine-readable failure code. Present when `state` is `failed`. Human-readable failure message. Present when `state` is `failed`. Task creation timestamp in Unix milliseconds. Task completion timestamp in Unix milliseconds. Present after completion. Processing duration in milliseconds. Present after completion when timing data is available. ## Webhook callback mode Use callback mode when your backend should receive the final result automatically instead of polling. ```bash theme={null} curl -X POST "https://api.apixo.ai/api/v1/generateTask/minimax-h3" \ -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": "reference-to-video", "prompt": "create an 8-second cinematic product video using these visual references", "image_urls": [ "https://example.com/ref-01.png", "https://example.com/ref-02.png" ], "aspect_ratio": "16:9", "resolution": "2k", "duration": 8 } }' ``` The callback payload uses the same top-level shape as status polling with `code`, `message`, and `data`. Successful callbacks include the final `state` and `resultJson`. See [Webhooks](/docs/api-reference/webhooks) for delivery requirements and retry behavior. ## Billing MiniMax H3 is billed per output second, with additional charges for reference videos and extra reference images in `reference-to-video`. | Item | APIXO price | Billing rule | | ---------------------------------- | ------------------ | ---------------------------------------- | | Output video | `$0.13 / second` | `duration * $0.13` | | Reference video input | `$0.13 / second` | Total actual seconds across `video_urls` | | Reference images after the first 5 | `$0.04 / image` | `max(0, image_urls.length - 5) * $0.04` | | Reference audio input | No separate charge | Audio is validated as reference material | Formula for `text-to-video` and `image-to-video`: ```text theme={null} total cost = output duration * $0.13 ``` Formula for `reference-to-video`: ```text theme={null} total cost = (output duration + total reference video seconds) * $0.13 + max(0, reference image count - 5) * $0.04 ``` Examples: | Request | Example charge | | ----------------------------------------------------------------- | ----------------------------------- | | 8-second output, 6 reference images, no reference video | `(8 * $0.13) + (1 * $0.04) = $1.08` | | 8-second output, one 15-second reference video, 1 reference image | `(8 + 15) * $0.13 = $2.99` | For current route and market comparison pricing, see [Pricing](https://apixo.ai/pricing). ## Latency and polling MiniMax H3 tasks are long-running 2k video jobs. Actual latency may vary by prompt complexity, duration, reference media accessibility, route queue load, and provider-side processing time. | Workload | Typical generation time | Recommended first poll | Poll interval | | ----------------------------------------------------- | ----------------------------------- | --------------------------- | ------------- | | Text-to-video or image-to-video | Varies by prompt and duration | 60s after task creation | 10s-15s | | Reference-to-video with image, video, or audio inputs | Often longer than simple generation | 60s-90s after task creation | 10s-15s | For production workloads, use callback mode to avoid frequent polling while video tasks run. Result URLs are temporary. Download and store important outputs promptly after task completion. 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](/docs/api-reference/system). ## Errors and troubleshooting ### HTTP errors | Code | Meaning | What to do | | ----- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------ | | `400` | Invalid request body, missing `input`, unsupported `mode`, missing `prompt`, invalid `resolution`, invalid `duration`, invalid `aspect_ratio`, or invalid media array | 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 | | `404` | Task not found when polling | Check the `taskId` | | `429` | Rate limit or concurrency limit reached | Retry with exponential backoff | | `500` | Server error or unknown task failure | Retry with backoff | | `502` | Upstream error | Retry with backoff | | `504` | Upstream timeout | Retry or use callback mode for long-running jobs | ### Validation notes | Condition | Backend behavior | | -------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- | | Missing `input` | Request fails before task creation. | | Missing, non-string, or empty `prompt` | Request fails before task creation. | | Prompt over 4,000 characters | Request fails before task creation. | | Missing `mode` | Request fails before task creation. | | Unsupported `mode` | Request fails before task creation. Supported values are `text-to-video`, `image-to-video`, and `reference-to-video`. | | Missing `resolution` | Defaults to `2k`. | | Unsupported `resolution` | Request fails before task creation. Only `2k` is supported. | | Missing `duration` | Defaults to `5`. | | `duration` outside `5` through `15` or a decimal value | Request fails before task creation. | | Missing `aspect_ratio` in text-to-video or reference-to-video | Defaults to `16:9`. | | Unsupported `aspect_ratio` | Request fails before task creation. | | Image-to-video without `image_urls` | Request fails before task creation. | | Image-to-video with more than 2 images | Request fails before task creation. | | Reference-to-video without both `image_urls` and `video_urls` | Request fails before task creation, even if `audio_urls` is present. | | Reference-to-video with more than 9 images, 3 videos, or 3 audio files | Request fails before task creation. | | Reference video or audio shorter than 2 seconds or longer than 15 seconds | Request fails before task creation. | | Total reference video duration or total reference audio duration over 15 seconds | Request fails before task creation. | ### Task failure codes `failCode` is generated from APIXO's mapped provider error. Common values include: | Fail code | Meaning | What to do | | ---------------------- | ------------------------------------------------------------ | ------------------------------------------------------- | | `SensitiveContent` | Prompt or input/output content was rejected by safety checks | Change the prompt or reference media | | `PromptInvalid` | Prompt was invalid or rejected by the provider | Rewrite the prompt and retry | | `ImageFormatIncorrect` | Reference image format could not be processed | Use a public, direct image URL in a common image format | | `RateLimited` | Provider-side rate limit was reached | Retry with exponential backoff | | `Timeout` | Provider-side timeout | Retry later or use callback mode | | `Unknown error` | The provider returned an unmapped failure | Retry with backoff or contact support with the `taskId` | See [Error Codes](/docs/api-reference/errors) for the full error reference. ## Related links * [Generation API Overview](/docs/models) * [Video Models](/docs/models/video) * [Generate Task](/docs/api-reference/generate-task) * [Status Task](/docs/api-reference/status-task) * [Webhooks](/docs/api-reference/webhooks) * [Error Codes](/docs/api-reference/errors) * [Parameter Specification](/docs/api-reference/parameters) * [Routing Strategies](/docs/concepts/routing-strategies) * [Try MiniMax H3 in the APIXO Playground](https://apixo.ai/models/minimax-h3) * [Pricing](https://apixo.ai/pricing)