Create Video
Image to Video
Reference to Video
Extend VideoAbout Veo 3.1 Fast
The Veo 3.1 Fast API for clips on a production cadence: text, first and last frame, up to 3 reference images and extension, 720p with sound from $0.36 a clip.
Call it with the model name google/veo-3.1-fast/reference-to-video on POST /jobs/createTask, from $0.72.
Introduction
Veo 3.1 Fast reference-to-video keeps people, products or places from up to three images in a new 8 second 720p clip with sound.
google/veo-3.1-fast/reference-to-video
Request parameters
| Parameter | Required | Description |
|---|---|---|
aspect_ratio | No | The shape of the frame: wide, square or tall. 16:9 · 9:16 · Default: 16:9 |
duration_seconds | No | Length of the generated clip. 8 · Default: 8 |
prompt | Yes | Describe what you want to make. |
reference_image_urls | Yes | Pictures of the people, outfits or places the result should keep. |
Pricing
Prices are in USD. The API uses a separate USD balance. Website credits cannot be used or transferred to it, and API funds cannot be transferred to website credits. When a task is accepted, we reserve the maximum quoted amount from your API balance. On completion, we charge for actual usage, never more than the hold, and release the remainder. If the task fails, the hold is released.
| Option | USD per run |
|---|---|
| Standard | $0.72 |
Send the same request body to POST /jobs/quote to see the estimated and maximum USD charge before running. A quote does not run the task or charge your balance.
API quick start
Call the Veo 3.1 Fast API in three steps
- Create an API key. Sign in to PopNow and create a key in the API console. Keys start with sk-popnow-. API calls use your separate USD balance.
- Send the request. POST /jobs/createTask with model google/veo-3.1-fast/reference-to-video and an input object that follows the parameter table. The response returns a task ID straight away.
- Get the result. Poll GET /jobs/recordInfo with the task ID, or pass a callBackUrl and we post the result to it. Download the output links when the task succeeds.
# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
-H "Authorization: Bearer $POPNOW_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $IDEMPOTENCY_KEY" \
-d '{
"model": "google/veo-3.1-fast/reference-to-video",
"input": {
"prompt": "A slow aerial shot drifting over a misty pine forest at sunrise",
"reference_image_urls": [
"https://media.popnow.ai/influencer/examples/ava.webp"
],
"aspect_ratio": "16:9",
"duration_seconds": 8
}
}'
# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
-H "Authorization: Bearer $POPNOW_API_KEY"Replace the prompt and any links with your own. The API tab has the response, polling and callback reference.
Veo 3.1 Fast API questions
How much does the Veo 3.1 Fast API cost?
Veo 3.1 Fast starts at $0.72 per run with Reference to Video, its cheapest task. The API uses a separate USD balance. When a task is accepted, we reserve the maximum quoted amount from your API balance. On completion, we charge for actual usage, never more than the hold, and release the remainder. If the task fails, the hold is released.
What are the limits of the Veo 3.1 Fast · Reference to Video API?
Clip length: 8 s; Aspect ratios: 16:9 · 9:16; Reference images: 3; Prompt length (characters): 4,000; Largest upload: 20 MB. Requests outside these limits are rejected before anything is charged.