MiniMax H3 Max API
Generate polished AI video from text, one image, or first and last frames through the imageat video API—without managing inference infrastructure.
Live playground
Try MiniMax H3 Max in your browser
Run a real video generation using your imageat account, then preview and download the completed output without leaving this page.
Output
Example outputTransparent pricing
Pay only for generated seconds
No model subscription or infrastructure fee. API requests are billed in USD; generations made in the browser playground use imageat credits.
480p
Fast drafts and lower-cost production
$0.05 / sec API
5-second video
$0.25 API · 6 credits
15-second video
$0.75 API · 18 credits
Browser playground: 1.2 credits per generated second, rounded up.
768p
Higher-detail final output · default
$0.08 / sec API
5-second video
$0.40 API · 6 credits
15-second video
$1.20 API · 18 credits
Browser playground: 1.2 credits per generated second, rounded up.
Text-to-video, image-to-video, and first/last-frame generation use the same rate. Failed generations are not charged.
Text and image input
Use only a prompt, add imageUrl, or provide firstFrameUrl and lastFrameUrl.
Asynchronous by design
Receive a taskId immediately and poll until the final CDN video URL is ready.
One imageat key
Use the same Bearer key, credits, run history, and response contract as other imageat models.
Quickstart
Your first request
Keep the API key on your server. Submit JSON, save the returned task and generation IDs, then poll the status endpoint.
POST /api/v1/videos
GET /api/v1/videos/status?taskId=…
curl -X POST "https://imageat.com/api/v1/videos" \
-H "Authorization: Bearer $IMAGEAT_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "minimax-h3-max",
"prompt": "A white kitten chases a butterfly through a sunlit garden",
"duration": "5s",
"resolution": "768p",
"aspectRatio": "16:9",
"generateAudio": false
}'Request parameters
| Parameter | Required | Values | Description |
|---|---|---|---|
| model | Yes | minimax-h3-max | Selects MiniMax H3 Max. |
| prompt | Yes | string | Describes subject, motion, camera, lighting, and style. |
| duration | No | 5s–15s | Defaults to 5 seconds. |
| resolution | No | 480p, 768p | Defaults to 768p. |
| aspectRatio | Text mode | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 | Image modes follow the supplied image. |
| imageUrl | No | public URL | Activates image-to-video. |
| firstFrameUrl + lastFrameUrl | No | public URLs | Activates first-to-last-frame generation. |
Polling response
{
"status": "completed",
"url": "https://cdn.imageat.com/generated/video.mp4"
}Production checklist
- Store IMAGEAT_API_KEY only on your server.
- Persist taskId and generationId before polling.
- Use exponential backoff for pending jobs.
- Treat the returned CDN URL as the final MP4 output.
Ready to build with MiniMax H3 Max?
Your existing imageat credits and API keys work here.