> ## Documentation Index
> Fetch the complete documentation index at: https://impossibl.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Live usage stream (SSE)

> Server-sent events. On connect, a `snapshot` event with the last 20 request log rows, the credit balance, the server-authoritative month-to-date totals (`monthToDate`: tokens, spentCredits, requests) and their read-time `cutoff`; then one `request` event per settled or failed request. Live `request` frames carry `balanceCredits`; a request replayed just after the snapshot omits it. Event data is JSON with `v: 1`. Heartbeat comments every 25s. Log rows only, payloads are never streamed.



## OpenAPI

````yaml /openapi.yaml get /v1/usage/stream
openapi: 3.1.0
info:
  title: Impossibl AI API
  version: 0.0.1
  description: >
    The Impossibl AI API is one API for all AI providers, OpenAI-compatible
    across OpenAI,

    Anthropic, Google, xAI, and more (`GET /v1/models` lists the full catalog),

    billed from a prepaid credit balance.


    Provider usage is billed at provider list prices with no usage markup.

    Prepaid credit purchases charge a separate fixed 5% platform fee before tax.


    **Agent quickstart**

    1. `POST /v1/accounts` — create a funded account; you get an API key and a
       signup-bonus balance in one call (no human step required).
    2. Call `POST /v1/chat/completions`, `POST /v1/responses`, or
       `POST /v1/audio/transcriptions` with
       `Authorization: Bearer <key>` and a `provider/model` id from `GET /v1/models`.
    3. Credits are deducted per request by token or audio-duration usage; check
    `GET /v1/account`.
servers:
  - url: https://api.impossibl.com
    description: Production
  - url: http://localhost:8787
    description: Local dev
security:
  - BearerKey: []
paths:
  /v1/usage/stream:
    get:
      summary: Live usage stream (SSE)
      description: >-
        Server-sent events. On connect, a `snapshot` event with the last 20
        request log rows, the credit balance, the server-authoritative
        month-to-date totals (`monthToDate`: tokens, spentCredits, requests) and
        their read-time `cutoff`; then one `request` event per settled or failed
        request. Live `request` frames carry `balanceCredits`; a request
        replayed just after the snapshot omits it. Event data is JSON with `v:
        1`. Heartbeat comments every 25s. Log rows only, payloads are never
        streamed.
      operationId: streamUsage
      responses:
        '200':
          description: A text/event-stream of snapshot and request events
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error:
              message: Invalid API key
              type: authentication_error
  schemas:
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
            type:
              type: string
              description: >-
                One of authentication_error, invalid_request_error,
                insufficient_quota, upstream_error, provider_not_configured.
  securitySchemes:
    BearerKey:
      type: http
      scheme: bearer
      description: Gateway API key (`imp-rt-...`) from POST /v1/accounts or /v1/keys.

````