5-second Wan 3.0 clip at 480p: 32 cents, not 31, and why

A 5-second Wan 3.0 clip at 480p works out to $0.3125 at Sume's rate, and Sume rounds the billable amount up to the next cent, so the job is billed $0.32. The Video Router docs describe the billable amount as list price times 1.25, with a ceiling to cents on each row.

For one clip the extra 0.75 cent is noise. For a batch of 2,000 cheap clips it adds up, so build the rounding into your estimate.

The arithmetic

Wan 3.0 lists at $0.05, $0.10 and $0.20 per second at 480p, 720p and 1080p. Multiply by 1.25 for the Sume rate, multiply by seconds, then round up to the cent.

Where it matters

Rounding is per job, not per second. Ten 5-second jobs at 480p cost $3.20, while one 50-second job is not possible on this id (30 s is the ceiling) and would cost $3.13 if it were. Splitting work into many tiny jobs costs a little more per second than fewer long ones, and the effect is largest at the cheapest tier.

If your volume is high, batch to longer clips where the creative allows it. If it is low, ignore this and spend the time on the prompt.

Check it on your own account

Do not take this post's arithmetic as a quote. Submit one 480p job and read usage.cost on the poll response. That field is the Sume billable amount, and it will show the rounded figure. Rates can change, so re-read the catalog row before you build a spreadsheet around them.

Putting it in an estimate

Use the rounded figure per job and sum the jobs. Do not round the batch total.

The same rule holds on every row of the video catalog, not only on Wan. A clip priced at $0.1125 bills $0.12, and one at $1.875 bills $1.88, so the effect is always under one cent per job.

• Compute seconds times the Sume rate for each job.
• Round each job up to the next cent.
• Add the rounded figures.
• Compare against usage.cost on a sample of finished jobs.