Use dry run mode to estimate the cost of a request without executing it. This validates your request parameters and returns pricing information so you can make informed decisions before generating.
Making a dry run request
Add ?dryRun=true as a query parameter to any image generation or edit request:
curl "https://api.lumenfall.ai/openai/v1/images/generations?dryRun=true" \
-H "Authorization: Bearer $LUMENFALL_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gemini-3-pro-image",
"prompt": "A capybara relaxing in a hot spring",
"size": "1024x1024",
"n": 2
}'
{
"estimated": true,
"model": "gemini-3-pro-image",
"provider": "vertex",
"total_cost_micros": 80000,
"currency": "USD",
"components": [
{
"type": "output",
"metric": "image",
"quantity": 2,
"billable_quantity": 2,
"unit_price": 0.04,
"total_cost": 80000
}
]
}
Response fields
| Field | Type | Description |
|---|
estimated | boolean | Always true for dry run responses |
model | string | The model that would be used |
provider | string | The provider that would handle the request (may differ on actual request as routing is re-evaluated) |
total_cost_micros | integer | Total estimated cost in micros (1/1,000,000 USD) |
currency | string | Currency code (always USD) |
components | array | Breakdown of cost components |
Cost components
Each component in the components array contains:
| Field | Type | Description |
|---|
type | string | Component type (e.g., output, input) |
metric | string | What is being measured (e.g., image, token) |
quantity | integer | Number of units requested |
billable_quantity | integer | Number of units that will be billed |
unit_price | number | Price per unit in USD |
total_cost | integer | Component cost in micros |
Converting micros to dollars
Costs are returned in micros (millionths of a dollar) for precision. To convert to dollars:
cost_dollars = total_cost_micros / 1_000_000
80000 micros equals $0.08.
Notes
Cost estimates are approximate. Effective pricing is calculated after the request runs, because final costs may depend on outputs (such as the number of tokens in a revised prompt).
- Validate your request parameters
- Do not generate images
- Do not affect your account balance
- Return quickly since no generation occurs
