Billing and credits
Prepaid API balance in pounds, paying with your paid credits, bulk bonus, limits and alerts.
How you pay
Each API project has a prepaid balance in pounds. Every job has a fixed price: it is held on the balance while the job runs and charged only when the job completes, so a failed job costs nothing. Prices are set in credits on the API rate card, at 10p a credit. Marking one submission is 15 credits, so £1.50 a submission.
- API balance. Top up in pounds, from £20.00 to £5,000 at a time.
- Use credits towards API. If your team switches this on, a job is paid from your organisation’s paid credits when they cover it, at the same number of credits; otherwise it is paid from your API balance. A job is never split between the two. Free starter and goodwill credits are never used for the API.
- Monthly invoices are only for contracts arranged with EduMark.
- Sandbox keys are free, on every plan.
Bulk bonus
Bigger top-ups buy credits at a lower price, and your balance is always credited at the full 10p a credit. For example, paying £90 for 1,000 credits gives you £100 of balance.
| Credits in one top-up | Price a credit | Example |
|---|---|---|
| Any amount | 10p | Pay £10.00, get £10.00 of balance |
| 1,000 or more | 9p | Pay £90.00, get £100 of balance |
| 5,000 or more | 8p | Pay £400, get £500 of balance |
| 20,000 or more | 7p | Pay £1,400, get £2,000 of balance |
Limits, alerts and automatic top-ups
- A monthly spending limit (default £100) covers both balance and credits. Jobs that would go over it are refused with
402 API_SPEND_LIMIT_REACHED. - Alerts are emailed at 50%, 80% and 100% of the limit, and when your balance runs low.
- Automatic top-up refills your balance from your saved card when it drops below a threshold, never past a monthly cap you set.
- Every job shows
credits,payment_sourceand, once settled, what was charged.