Reaction clip on Wan 3.0: 3 s is $0.1875 at 480p, 50 for $9.375

A 3-second Wan 3.0 clip costs $0.1875 at 480p, $0.375 at 720p and $0.75 at 1080p on Sume. That is three times the per-second rate, because Wan 3.0 is billed per second by resolution and accepts any whole number of seconds from 2 to 30 (read 2026-10-09).

What a 3-second reaction clip costs

Reaction clips, sticker loops and chat-reply videos are short, so the floor matters more than the ceiling. Wan 3.0 has the lowest floor in the Sume catalog at 2 seconds, and nothing forces you to round up to 4 or 5.

Submit it

Send duration as an integer. The request goes to POST /v1/videos, and you poll the returned polling_url. Reuse one Idempotency-Key per clip so a retried submit returns the original job instead of a second charge.

import os, time, requests

API = "https://api.sume.com/v1/videos"
H = {"Authorization": "Bearer " + os.environ["SUME_API_KEY"]}
body = {"model": "wan-3.0", "prompt": "A cat blinks, then slowly raises one eyebrow at the camera", "duration": 3, "resolution": "480p", "aspect_ratio": "1:1"}
job = requests.post(API, headers={**H, "Idempotency-Key": "reaction-cat-001"}, json=body, timeout=60).json()
deadline = time.time() + 1800
while time.time() < deadline:
    time.sleep(30)
    job = requests.get(job["polling_url"], headers=H, timeout=60).json()
    if job["status"] == "completed":
        print(job["unsigned_urls"][0], job["usage"]["cost"])
        break
    if job["status"] in ("failed", "cancelled"):
        print(job["status"], job.get("error"))
        break

A worked batch: 50 reaction clips

Say a community bot sends a fresh reaction clip for each of 50 triggers. At 3 seconds and 480p that is 50 x $0.1875 = $9.375. The same 50 at 720p cost $18.75, and at 1080p $37.50. Reaction clips are watched at chat size, so the 480p row is usually the right default.

The 2-second row is worth a look as well. If the joke lands in two seconds, 50 clips cost $6.25 at 480p. The only change in the request is duration: 2, which is the lowest value the Wan 3.0 envelope allows.

Because Wan 3.0 has no aspect-ratio term in its price, you can generate 1:1 for chat apps and 9:16 for stories at the same cost. If you want both from one idea, run the prompt twice with a different aspect_ratio rather than cropping.

Limits to check first

• Durations outside 2 to 30 do not get a price. A 1-second request is outside the envelope, so read supported_durations from GET /v1/videos/models instead of guessing.
• Aspect ratios are listed per model in supported_aspect_ratios; for a sticker-style loop, 1:1 is in the Wan 3.0 list, and the price does not change with the ratio.
• usage.cost on the completed poll response is the billable amount. At submit Sume reserves the list price times 1.25, so a 3-second 480p test needs only about 19 cents of balance.
• Three seconds at 1080p ($0.75) costs the same as six seconds at 720p ($0.75). If a viewer on a phone will not see the difference, the longer 720p clip is the better buy.