A 240-character ad line costs 2 cents on Sume TTS: per-job rounding

A 240-character ad line at Sume's list rate of $0.0475 per 1,000 characters is 1.14 cents, and Sume rounds each TTS job up to a whole cent, so it bills at least 2 cents. For many tiny lines, per-job rounding matters more than the per-character rate.

The arithmetic

Rate: $0.0475 per 1,000 characters (rate card in the Sume docs and GET /v1/catalog). The billing formula is list price times margin, rounded up to cents, with a one-cent minimum, so the table shows list cost and the smallest possible bill.

What this means for a script

Joining many short lines into one job saves the rounding but loses per-line control, since you get one audio file to cut apart. Splitting keeps each line editable but pays up to a cent of rounding each. Spaces and punctuation count as characters.

Use dry_run to see the estimate before you spend and max_spend_usd to cap a request.

Compare, carefully

Microsoft lists $15 per million characters for MAI-Voice-2.1 Flash, which is 0.36 cents for 240 characters before any rounding rule Microsoft may apply. We did not find a rounding rule on its pages, so do not assume parity.