Billing Events

Returns paginated individual billing event records with filters for endpoint and date range. Each record includes the request ID, timestamp, endpoint, and output units billed.

Key Features:

• Individual billing event records for each API request
• Flexible date range filtering
• Optional endpoint filtering
• Cursor-based pagination for efficient large dataset queries
• Limited to 10000 records per page for performance
• Date range capped at 90 days per request

Common Use Cases:

• Audit individual billing events
• Track request patterns and volumes
• Debug specific requests by ID
• Monitor billing unit consumption per request

See fal.ai docs for more details.

GET /models/billing-events

Billing Events

cURL

curl --request GET \
  --url https://api.fal.ai/v1/models/billing-events \
  --header 'Authorization: <api-key>'

import requests

url = "https://api.fal.ai/v1/models/billing-events"

headers = {"Authorization": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {Authorization: '<api-key>'}};

fetch('https://api.fal.ai/v1/models/billing-events', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

200

{
  "billing_events": [
    {
      "request_id": "abc123",
      "endpoint_id": "fal-ai/flux/dev",
      "timestamp": "2025-01-15T10:30:45Z",
      "output_units": 1.5,
      "unit_price": 0.001,
      "percent_discount": null,
      "cost_estimate_nano_usd": 1500000
    },
    {
      "request_id": "def456",
      "endpoint_id": "fal-ai/flux/dev",
      "timestamp": "2025-01-15T10:25:30Z",
      "output_units": 2,
      "unit_price": 0.001,
      "percent_discount": 10,
      "cost_estimate_nano_usd": 1800000
    }
  ],
  "next_cursor": "MjAyNS0wMS0xNVQxMDoyNTozMFo=",
  "has_more": true
}

{
  "error": {
    "type": "validation_error",
    "message": "Invalid request parameters"
  }
}

{
  "error": {
    "type": "authorization_error",
    "message": "Authentication required"
  }
}

{
  "error": {
    "type": "authorization_error",
    "message": "Access denied"
  }
}

{
  "error": {
    "type": "not_found",
    "message": "Resource not found"
  }
}

{
  "error": {
    "type": "rate_limited",
    "message": "Rate limit exceeded"
  }
}

Authorizations

Authorization · string · header · required

Admin API key must be prefixed with "Key ", e.g. Authorization: Key YOUR_ADMIN_API_KEY

Query Parameters

limit · integer

Maximum number of items to return. Actual maximum depends on query type and expansion parameters.

Required range: x >= 1

Example:

50

cursor · string

Pagination cursor from previous response. Encodes the page number.

Example:

"Mg=="

start · string<date-time> string

Start date in ISO8601 format (e.g., '2025-01-01T00:00:00Z' or '2025-01-01'). Defaults to 24 hours ago.

Example:

"2025-01-01T00:00:00Z"

end · string<date-time> string

End date in ISO8601 format, exclusive (e.g., '2025-02-01T00:00:00Z' or '2025-02-01'). Data up to but not including this timestamp is returned. Defaults to current time.

Example:

"2025-02-01T00:00:00Z"

endpoint_id · string string[]

Filter by specific endpoint ID(s). Accepts 1-50 endpoint IDs. Supports comma-separated values: ?endpoint_id=model1,model2 or array syntax: ?endpoint_id=model1&endpoint_id=model2

Example:

["fal-ai/flux/dev"]

request_id · string string[]

Filter by specific request ID(s). Accepts 1-50 request IDs. Supports comma-separated values: ?request_id=req1,req2 or array syntax: ?request_id=req1&request_id=req2

Example:

["req-abc123"]

expand · string string[]

Data to include in the response. Use 'auth_method' to include authentication method information (formatted with user key aliases).

Example:

"auth_method"

Response

200

application/json

Billing event data retrieved successfully

Response containing billing event data with pagination support

next_cursor · string | null · required

Cursor for the next page of results, null if no more pages

has_more · boolean · required

Boolean indicating if more results are available (convenience field derived from next_cursor)

billing_events · object[] · required

List of billing event records

Show child attributes