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Lumenfall offers transparent, usage-based pricing with two billing modes to fit your needs.

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Billing modes

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Prepaid

Add funds to your account and pay as you go. Requests are charged against your balance in real-time.
  • Best for: Startups, side projects, controlled budgets
  • Balance check: Every request validates sufficient balance
  • Auto top-up: Optionally configure automatic refills when balance is low
Manage your balance on the Credits page.

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Postpaid (invoice billing)

Generate now, pay later. You receive a monthly invoice for your usage.
  • Best for: Established companies, high-volume usage
  • Credit limit: Based on your account history
  • Invoicing: Monthly billing cycle
Contact support@lumenfall.ai to request invoice billing.

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Pricing

Pricing varies by model and is calculated per request based on:
  • Model used — Different models have different costs
  • Image dimensions — Larger images cost more
  • Number of images — Cost scales with n parameter

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Example pricing

ModelBase priceNotes
imagen-3$0.04/image1024x1024
imagen-3-fast$0.02/image1024x1024
dall-e-3$0.04/image1024x1024 standard
dall-e-3$0.08/image1024x1024 HD
dall-e-2$0.02/image1024x1024
flux-pro$0.05/image1024x1024
Pricing varies by model, resolution, quality settings, and other factors. Check the model catalog for current pricing details.

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Cost estimation

Use dry run mode to estimate costs before generating: 
curl "https://api.lumenfall.ai/openai/v1/images/generations?dryRun=true" \
  -H "Authorization: Bearer $LUMENFALL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "imagen-3",
    "prompt": "A test prompt",
    "n": 4,
    "size": "1024x1024"
  }'
The response includes estimated cost without executing the request.

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Insufficient balance errors

If your prepaid balance is too low, requests return a 402 error: 
{
  "error": {
    "message": "Insufficient balance",
    "type": "billing_error",
    "code": "INSUFFICIENT_BALANCE"
  }
}
To resolve:
  1. Add funds to your account
  2. Enable auto top-up to prevent future interruptions
  3. Consider switching to postpaid billing for uninterrupted service