Wan 3.0 30-second clip cost: $1.88 at 480p to $7.50 at 1080p

A 30-second Wan 3.0 clip on Sume costs about $1.88 at 480p, $3.75 at 720p and $7.50 at 1080p. Those figures come from the Sume list rates of $0.05, $0.10 and $0.20 per second, multiplied by 1.25 and rounded up to the cent. wan-3.0 accepts 2 to 30 seconds, so 30 seconds is a single generation, not a join of shorter ones.

If you generate several, the cost is linear, which makes planning simple.

How is the number built?

Seconds times list rate times 1.25, rounded up to the cent. At 480p: 30 x $0.05 = $1.50, x 1.25 = $1.875, rounded to $1.88. At 720p: 30 x $0.10 x 1.25 = $3.75. At 1080p: 30 x $0.20 x 1.25 = $7.50.

What happens if the balance runs out?

Sume's errors page lists 402 insufficient_credits when a request cannot be funded and 429 for rate_limited and queue_full. Neither bills you. Check the code before you retry, and send an Idempotency-Key on every create so a retry after a timeout does not make a second job.

Should I draft at 480p first?

It is a sensible habit: generate the draft at 480p for $1.88, judge the motion, then rerun the keeper at 1080p. The two runs are separate jobs with separate bills, so budget for both. Keep prompts and ids in a sheet so you can reproduce what you chose.