Organizer Guide: Billing

How credits, pricing, and billing work on razorBridge.

Credit system

razorBridge uses EUR credits. One credit equals one euro. Credits cover both GPU Blade usage and Inference Gates API calls — one account, one ledger.

Credits are denominated in EUR
Both GPU Blades and Inference Gates deduct from the same balance
Credits do not expire

Getting credits

For the current version, credits are granted manually:

Free tier — every new account receives €10 on signup, for testing and evaluation.
Grants — contact KlusAI at [email protected] to request a credit grant for your course or organization.

Self-serve credit purchase via Stripe is planned. For now, grants are processed within 24 hours.

Checking balance

In the Hub, go to Billing to see:

Current credit balance
Transaction history with timestamps
Cost breakdown by event and usage type

Students can check their balance from the CLI:

$ rb credits
Balance: €8.43

Recent transactions:
  -€0.22  Inference Gates (llama-3.1-8b)     2h ago
  -€1.44  GPU Blade (CUDA-2026, L40S, 1hr)   yesterday
  +€10.00 Signup credit                       3 days ago

Cost tracking

Every GPU session and inference call is logged in the transaction ledger. The Source column identifies the cost type:

consumption — GPU Blade runtime
inference — Inference Gates API calls
grant — credits received from admin or signup bonus

GPU pricing

GPU	VRAM	Best for	Rate
L40S	48 GB	Training & workshops	€1,44/hr
H100	80 GB	Large model training	€3,12/hr
H100 × 8	640 GB	Multi-GPU workloads	€22,01/hr

Pricing is per blade, per hour. Partial hours are billed proportionally (per-minute granularity).

Budgeting for a semester

Use this formula to estimate your semester cost:

semester_cost = weeks × session_cost × sessions_per_week

session_cost = hourly_rate × duration_hours × participants

Example: ML course

12 weekly labs, 3 hours each
40 students
L40S GPUs (€1,44/hr)

session_cost = €1,44/hr × 3hr × 40 students = €172,80/session
semester_cost = 12 weeks × €172,80 = €2073,60/semester

In practice, not all students attend every session. With 80% average attendance:

realistic_cost = €2088 × 0.8 = ~€1670/semester

You only pay for blades that are actually provisioned. If 32 out of 40 students join, you pay for 32 blades — not 40.

Future: self-serve purchase

Stripe integration for self-serve credit purchase is planned. For now:

Contact [email protected] for credit grants
University invoicing available for semester budgets over €500
Grants are processed within 24 hours