Pricing
Nuton’s API is pay-as-you-go: you’re billed per successful operation, in USD.
There’s no subscription on the PAYG model. Test keys (sk-nuton-test-*) are
free and never billed; only production keys (sk-nuton-prod-*) incur charges.
The one operation most people use is course generation. Everything else — study notes, flashcards, exams, podcasts — is an optional add-on you only pay for when you explicitly request it. So your real monthly cost is usually far lower than adding up every line in the table.
What course generation includes
A single course generation ($0.50) isn’t just one LLM call — it produces a complete learning unit:
- Complete multi-chapter course — structured outline, chapters, and content
- Auto-generated study guide — created with the course, no extra charge
You can then optionally layer on materials (each billed only if you generate it):
| Optional add-on | Price | When you’re charged |
|---|---|---|
| Study notes | $0.05 / course | Only if you call generate-notes (cached re-gen is free) |
| Flashcards | $0.03 / course | Only if you call generate-flashcards |
| Exam generation | $0.05 / course | Only if you call generate-exam |
| Exam grading | $0.01 / submission | Per exam submitted for grading |
| Podcast generation | $0.30 / course | Only if you generate podcasts |
The numbers below are served live by GET /api/v2/pricing (no auth) and
power the estimator on this page. If a number here ever disagrees with that
endpoint, the endpoint wins.
Estimate your cost
Full price list
Core
| Operation | Unit | Price (USD) |
|---|---|---|
| Course generation (incl. course + chapters + study guide) | per course | $0.50 |
Optional study materials
| Operation | Unit | Price (USD) |
|---|---|---|
| Study notes | per course | $0.05 |
| Flashcards | per course | $0.03 |
| Exam generation | per course | $0.05 |
| Exam grading | per submission | $0.01 |
Documents & queries
| Operation | Unit | Price (USD) |
|---|---|---|
| Document processing (upload + chunk + embed) | per document | $0.10 |
| Queries & chat (document query / ask a course) | per query | $0.02 |
| YouTube transcript | per video | $0.02 |
Podcasts
| Operation | Unit | Price (USD) |
|---|---|---|
| Podcast generation | per course | $0.30 |
| Podcast regeneration | per episode | $0.30 |
Re-fetching already-generated study materials (notes, flashcards, exams) is free — you’re only charged for the generation.
Document extraction (per-unit)
Extraction (POST /v2/documents/extract) is not a flat per-request price —
it’s metered by the work done:
| Extraction type | Rate (USD) |
|---|---|
| OCR (PDF, scanned images) | $0.002 per page |
| Plain-text files (.txt, .md, DOCX/PPTX/HTML via reader) | $0.001 per file |
| YouTube transcript fetch | $0.0005 per video |
Worked examples
- Just courses — 100 courses / month (no optional add-ons)
100 × $0.50 =$50 / month - Courses + notes — 100 courses, each with study notes
100 × ($0.50 + $0.05) =$55 / month - Query-heavy app — 50 courses + 5,000 queries / month
50 × $0.50 + 5,000 × $0.02 =$125 / month - Extraction-heavy — 1,000 PDFs averaging 12 pages each / month
1,000 × 12 × $0.002 =$24 / month