Does Sume offer invoice or PO billing? What is public and what is not

Yes, in the sense that the Sume pricing page lists "Invoice / PO billing" as an Enterprise feature, next to custom plans and volume pricing, higher concurrency and controls, and priority support. The page gives no price, no payment terms and no minimum; the call to action is a contact address.

This post is short because the public record is short. It separates what you can read today from what a purchasing team has to ask.

What is public about Enterprise?

The pricing page, read on 2026-10-03, and its FAQ say the following about the tiers that are not self-serve.

What stays the same on invoice billing?

The pages cited here do not say, so do not assume. What the public docs do establish is the metering: every paid call reserves at submit, captures on success and refunds on failure, and GET /v1/usage with job_id, run_id or thread_id returns a summary with debited_usd_micros. That is the number an invoice would have to reconcile against, so keep the job ids from your own systems.

Top-ups are made in the dashboard, and the credits page says the public API has no top-up endpoint. Whether invoiced customers prepay or are billed in arrears is not on a page I could read, so ask before you design around either.

What should a purchasing team ask?

Write the questions before the call so the answers can be filed.

• Is the account prepaid, or billed in arrears against a limit?
• What happens to jobs when the limit is reached: the same 402 insufficient_credits, or a different path?
• Are the per-unit rates on the API pricing page the starting point for the custom volume rate?
• Can usage be split by workspace or cost centre, and how does that appear on the invoice?
• What is the PO number process and the payment term?
• Who is the contact for disputes on a captured job?

How can you budget before the call?

Use the published rates as a ceiling and your own job logs as a floor. Multiply your expected units by the API rates, add a retake factor from your last month, and treat the result as the upper bound for the volume conversation. How to top up AI API credits covers the self-serve alternative, and the top-up sizing post shows what each purchase size buys.

If you will be under about $1,000 between top-ups, the self-serve wallet is enough and needs no negotiation. Invoice billing is for teams whose finance process cannot pay by card.