Birthday invitation clip from an illustrated card: Seedance 2.5, $3.47

A 6-second 9:16 birthday invitation clip from one illustrated card costs $3.47 on Seedance 2.5 at 720p on Sume, or $1.62 at 480p. Three variants (balloons, confetti, a cake candle flicker) are $10.41. Use an illustration, not a photo of a child: uploading a child's photo to any video service is a decision for the parent, not a default.

Send the card as the first_frame. The model animates from the card and the party details stay where you drew them. Put the date, time and address on the text of your message or as a caption, not in the generated frames.

The request

The request is image-to-video on seedance-2.5, 9:16, 6 seconds, 720p:

{
  "model": "seedance-2.5",
  "prompt": "The illustrated balloons float up and sway, confetti falls softly, the cake candle flickers, the camera stays still",
  "duration": 6,
  "resolution": "720p",
  "aspect_ratio": "9:16",
  "generate_audio": false,
  "frame_images": [
    {"type": "image_url", "image_url": {"url": "https://example.com/invite-card.png"}, "frame_type": "first_frame"}
  ]
}

Details that matter

generate_audio is optional on Seedance 2.5 and the price does not change with it, so a muted invite costs the same as one with sound. Mute it if the clip goes into a chat where autoplay sound is unwelcome.

The card must be a public HTTPS URL. Prepare the card at 9:16 (720x1280) and set aspect_ratio to 9:16 explicitly, so the first frame and the output share a shape and nothing is cropped.

Next step

If you want a version with a voiceover, make it separately and lay it on a timeline; the clip is the picture.