Video Generation

Endpoints

POST /v1/videos/generations            # submit job
GET  /v1/videos/generations/{id}       # poll status

Video generation is asynchronous. The submit call returns immediately with a job id and a poll_url; the client polls until status is completed (or failed).

Submit Request

Field	Type	Default	Description
`model`	string	`"auto"`	Video model (see Providers). Use `"auto"` for health-aware routing.
`prompt`	string	required	Text description. 1–8000 chars.
`duration_seconds`	number	provider default	1–60 seconds. Most models cap at 4–10s on free tier.
`aspect_ratio`	string	`"16:9"`	One of `"16:9"`, `"9:16"`, `"1:1"`.
`image_url`	string	—	Public HTTPS image URL for image-to-video models (Wan 2.6, Wan 2.2 I2V).
`project_id`	string	—	Body-level project tag. Alternative to `x-gateway-project-id` header.

Required Header

Header	Required	Description
`Authorization: Bearer <GATEWAY_API_KEY>`	yes	Gateway API key.
`x-gateway-project-id`	yes (or body `project_id`)	1–64 chars `[a-zA-Z0-9._:-]`.

Providers

All video models currently route through Together AI (TOGETHER_API_KEY required).

Model ID	Upstream Model	Capabilities
`sora-2`	`openai/sora-2`	Text-to-video
`veo-3-audio`	`google/veo-3.0-audio`	Text-to-video with audio
`veo-3-fast-audio`	`google/veo-3.0-fast-audio`	Faster Veo 3 variant with audio
`veo-2`	`google/veo-2.0`	Text-to-video
`kling-2.1-master`	`kwaivgI/kling-2.1-master`	High-quality Kling
`kling-2.1-pro`	`kwaivgI/kling-2.1-pro`	Kling pro tier
`kling-2.0-master`	`kwaivgI/kling-2.0-master`	Previous-gen Kling
`kling-1.6-pro`	`kwaivgI/kling-1.6-pro`	Kling 1.6
`wan-2.6-image`	`Wan-AI/Wan2.6-image`	Image-to-video
`wan-2.2-i2v`	`Wan-AI/Wan2.2-I2V-A14B`	Image-to-video
`vidu-q1`	`vidu/vidu-q1`	Text-to-video
`seedream-3`	`ByteDance-Seed/Seedream-3.0`	ByteDance Seedream
`seedream-4`	`ByteDance-Seed/Seedream-4.0`	ByteDance Seedream v4

Daily free-tier limits are tight (typically 10–30 requests per model per day). See GET /v1/models for the live enabled list.

Submit Response

Status 202 Accepted when the job is queued, or 200 OK if the provider happens to return a finished job synchronously.

{
  "id": "job_abc123",
  "status": "processing",
  "poll_url": "/v1/videos/generations/job_abc123",
  "x_gateway": {
    "provider": "together",
    "model": "openai/sora-2",
    "attempts": 1,
    "request_id": "req_xyz",
    "project_id": "my_project"
  }
}

Poll Response

{
  "id": "job_abc123",
  "status": "completed",
  "video_url": "https://cdn.example/video.mp4",
  "x_gateway": {
    "provider": "together",
    "model": "openai/sora-2",
    "attempts": 1,
    "request_id": "req_poll1",
    "project_id": "my_project"
  }
}

status is one of "processing", "completed", "failed". When failed, error contains the upstream message.

Examples

curl https://ai-gateway.sassmaker.com/v1/videos/generations \
  -H "Authorization: Bearer <GATEWAY_API_KEY>" \
  -H "x-gateway-project-id: my_project" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "sora-2",
    "prompt": "A slow aerial drone shot over a misty mountain lake at dawn",
    "duration_seconds": 5,
    "aspect_ratio": "16:9"
  }'

const res = await fetch('https://ai-gateway.sassmaker.com/v1/videos/generations', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer <GATEWAY_API_KEY>',
    'x-gateway-project-id': 'my_project',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model: 'sora-2',
    prompt: 'A slow aerial drone shot over a misty mountain lake at dawn',
    duration_seconds: 5,
    aspect_ratio: '16:9',
  }),
});

const job = await res.json();
console.log('Job ID:', job.id, 'Status:', job.status);

Poll until complete

const BASE = 'https://ai-gateway.sassmaker.com';

async function pollUntilDone(jobId, { interval = 5000, timeout = 300_000 } = {}) {
  const deadline = Date.now() + timeout;
  while (Date.now() < deadline) {
    const res = await fetch(`${BASE}/v1/videos/generations/${jobId}`, {
      headers: { 'Authorization': 'Bearer <GATEWAY_API_KEY>' },
    });
    const body = await res.json();
    if (body.status === 'completed') return body.video_url;
    if (body.status === 'failed') throw new Error(body.error ?? 'job failed');
    await new Promise((r) => setTimeout(r, interval));
  }
  throw new Error('poll timeout');
}

const videoUrl = await pollUntilDone('job_abc123');
console.log(videoUrl);

Image-to-video (Wan)

curl https://ai-gateway.sassmaker.com/v1/videos/generations \
  -H "Authorization: Bearer <GATEWAY_API_KEY>" \
  -H "x-gateway-project-id: my_project" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "wan-2.2-i2v",
    "prompt": "Camera pans right as clouds roll in",
    "image_url": "https://example.com/source-frame.jpg",
    "duration_seconds": 4
  }'

Error Codes

Status	`code`	Meaning
400	`invalid_project_id`	Missing/invalid `project_id`.
404	—	Job ID unknown, or upstream poll endpoint returned 404 (see beta caveat above).
502	`provider_error`	Submit or poll failed at upstream.
503	`no_video_provider`	`TOGETHER_API_KEY` not configured.