Billing
Billing
Prepaid credits and exact API-key spend control.
Billing formula
10€ paid buys 20€ GPT-5.5 credit
X420.ai uses one simple rule across checkout and billing: choose X€ before VAT, pay X€ + VAT, and receive X×2€ official-value GPT-5.5 API credit. A 10€ base amount grants 20€ credit.
- You pay
- 10€
- API credit
- 20€ official-value credit
- Multiplier
- 2×
- Effective reduction
- 50%
Updated 2026-06-04. Pricing and availability can change with partner surplus supply.
How prepaid credit works
Your balance holds prepaid credits. Each API call deducts the token cost after completion. You are never charged for failed requests.
Pack formula
Selected amount × 2 = official-value wallet credit Selected amount = Stripe payment amount
The checkout uses the same x2 credit rule shown before payment.
Pack examples
| Customer pays | Credit received | Effective reduction |
|---|---|---|
| 10€ | 20€ | 50% |
| 50€ | 100€ | 50% |
| 100€ | 200€ | 50% |
| 250€ | 500€ | 50% |
Credits are added after Stripe confirmation. Availability and discounting depend on partner surplus supply.
Low balance alerts
When your balance falls below certain thresholds, you receive an in-app notification.
Buy credit from the Dashboard → Billing.