Attribution Data API

Get session cost breakdown

Returns per-session cost totals, ordered by total cost descending. Call it with a GET request to /attribution-data/sessions, authenticated with a restricted API key and the "costs:read" scope.

GET https://api.bearlumen.com/v1/attribution-data/sessions

Returns per-session cost totals, ordered by total cost descending. Include `session_id` on your usage events to group them into sessions; optionally include `session_type` (any string label, e.g., "support-agent", "batch-summarizer"). Events without `session_id` are excluded. Events without `session_type` appear here with `session_type` "unknown". The `summary` object reflects only the sessions returned in this response (after limit/offset), not the full date range. There is no range-wide total; page until fewer than `limit` sessions are returned. Requests count toward your per-API-key rate limit; sustained overruns return 429 with the standard error envelope.

Authentication and scopes

Authenticate with a restricted API key in the Authorization: Bearer <key> header. This endpoint requires the costs:read scope.

Parameters

Name	In	Type	Required	Description
`start_date`	query	`string`	Yes	Start of date range (ISO 8601, inclusive). If start_date is not before end_date the response is empty rather than an error.
`end_date`	query	`string`	Yes	End of date range (ISO 8601, exclusive).
`session_type`	query	`string`	No	Exact-match filter on the session_type value (e.g., "support-agent").
`limit`	query	`number (double)`	No	Maximum sessions to return, ordered by total cost descending (default 100).
`offset`	query	`number (double)`	No	Number of sessions to skip for pagination (default 0).

Response example

Success response (200):

{
  "sessions": [
    {
      "event_count": 4,
      "session_id": "sess_mQ4vX8kN",
      "session_type": "multiplayer",
      "total_cost": "10.4"
    },
    {
      "event_count": 3,
      "session_id": "sess_tR7pW2jD",
      "session_type": "multiplayer",
      "total_cost": "6.6"
    }
  ],
  "summary": {
    "avg_cost_per_session": "8.5",
    "total_sessions": 2
  }
}

Error codes

Errors return the standard error envelope with a code, message, and a correlationId you can quote to support.

Status	When it happens
`400`	Invalid request data. Check that start_date and end_date are valid ISO 8601 dates and fix the field named in error.message.
`401`	Missing or invalid API key. Send your key as Authorization: Bearer YOUR_API_KEY.
`403`	API key lacks the costs:read scope. Create or update an API key with the costs:read scope, then retry.
`429`	Rate limit or plan quota exceeded. Slow down and retry after the current window resets.

Rate limits and retries

Rate limit or plan quota exceeded. Slow down and retry after the current window resets.