> ## Documentation Index > Fetch the complete documentation index at: https://docs.surfsky.io/llms.txt > Use this file to discover all available pages before exploring further. # Get usage > Sum sessions, billed browser time and spending over the last 24 hours, 7, 30 and 90 days, and count sessions per hour or day for a chart. Sessions count by start time, spending by when the ledger posted the charge. ## OpenAPI ````yaml /api-reference/openapi.json get /billing/usage openapi: 3.1.0 info: title: Surfsky API version: 0.1.0 description: >- Start cloud browsers, control them through CDP, and manage the profiles, proxies, and fingerprints they run with. servers: - url: '{baseUrl}' variables: baseUrl: default: https://YOUR_API_HOST description: API base URL from your Surfsky dashboard, including https://. security: - ApiToken: [] tags: - name: scrape description: >- Fetch one page through a browser that is already running: a residential proxy and a desktop fingerprint, nothing kept between requests. - name: profiles description: >- Start, stop, and manage browsers. A one-time profile is discarded when it stops; a persistent profile keeps its cookies, storage, and fingerprint according to its storage settings. - name: proxies description: >- Look up available proxy locations and check traffic quotas for the premium and shared pools. - name: fingerprints description: >- Look up accepted renderer, screen, and device model values before configuring a fingerprint. - name: extensions description: Upload Chrome extensions once and load them into any browser you start. - name: billing description: >- Read the balance, the receipt of every session and scrape, usage over time windows and the ledger of charges and top-ups. - name: site-reports description: Tell the Surfsky team about a website that keeps blocking your browsers. paths: /billing/usage: get: tags: - billing summary: Get usage description: >- Sum sessions, billed browser time and spending over the last 24 hours, 7, 30 and 90 days, and count sessions per hour or day for a chart. Sessions count by start time, spending by when the ledger posted the charge. operationId: billing_usage_billing_usage_get responses: '200': description: Successful response content: application/json: schema: $ref: '#/components/schemas/Usage' '401': description: Missing or invalid API token content: application/json: schema: $ref: '#/components/schemas/ApiError' '403': description: Account or feature access denied content: application/json: schema: $ref: '#/components/schemas/ApiError' '422': description: Request validation failed content: application/json: schema: $ref: '#/components/schemas/ApiError' components: schemas: Usage: type: object properties: success: type: boolean msg: type: string data: type: object properties: on_demand: type: boolean description: As on the balance. windows: type: object properties: 24h: type: object properties: sessions: type: integer description: Sessions and scrapes started in the window. browser_seconds: type: integer description: Billed browser time. browser_minutes: type: integer description: browser_seconds in whole minutes. browser_cost: type: string description: USD as a decimal string, such as "12.5". premium_cost: type: string description: Premium proxy traffic charges. captcha_cost: type: string description: Captcha solve charges. total_spent: type: string description: The three costs added up. premium_gb: type: number description: Premium proxy traffic in decimal GB, three decimals. required: - sessions - browser_seconds - browser_minutes - browser_cost - premium_cost - captcha_cost - total_spent - premium_gb 7d: type: object properties: sessions: type: integer description: Sessions and scrapes started in the window. browser_seconds: type: integer description: Billed browser time. browser_minutes: type: integer description: browser_seconds in whole minutes. browser_cost: type: string description: USD as a decimal string, such as "12.5". premium_cost: type: string description: Premium proxy traffic charges. captcha_cost: type: string description: Captcha solve charges. total_spent: type: string description: The three costs added up. premium_gb: type: number description: Premium proxy traffic in decimal GB, three decimals. required: - sessions - browser_seconds - browser_minutes - browser_cost - premium_cost - captcha_cost - total_spent - premium_gb 30d: type: object properties: sessions: type: integer description: Sessions and scrapes started in the window. browser_seconds: type: integer description: Billed browser time. browser_minutes: type: integer description: browser_seconds in whole minutes. browser_cost: type: string description: USD as a decimal string, such as "12.5". premium_cost: type: string description: Premium proxy traffic charges. captcha_cost: type: string description: Captcha solve charges. total_spent: type: string description: The three costs added up. premium_gb: type: number description: Premium proxy traffic in decimal GB, three decimals. required: - sessions - browser_seconds - browser_minutes - browser_cost - premium_cost - captcha_cost - total_spent - premium_gb 90d: type: object properties: sessions: type: integer description: Sessions and scrapes started in the window. browser_seconds: type: integer description: Billed browser time. browser_minutes: type: integer description: browser_seconds in whole minutes. browser_cost: type: string description: USD as a decimal string, such as "12.5". premium_cost: type: string description: Premium proxy traffic charges. captcha_cost: type: string description: Captcha solve charges. total_spent: type: string description: The three costs added up. premium_gb: type: number description: Premium proxy traffic in decimal GB, three decimals. required: - sessions - browser_seconds - browser_minutes - browser_cost - premium_cost - captcha_cost - total_spent - premium_gb required: - 24h - 7d - 30d - 90d description: Totals over the trailing window. series: type: object properties: 24h: type: array items: type: object properties: at: type: integer description: Start of the hour or day in Unix seconds, UTC. sessions: type: integer required: - at - sessions 7d: type: array items: type: object properties: at: type: integer description: Start of the hour or day in Unix seconds, UTC. sessions: type: integer required: - at - sessions 30d: type: array items: type: object properties: at: type: integer description: Start of the hour or day in Unix seconds, UTC. sessions: type: integer required: - at - sessions required: - 24h - 7d - 30d description: >- Sessions started per hour over 24 hours and per day over 7 and 30 days, oldest first. required: - on_demand - windows - series required: - success - data ApiError: type: object properties: success: type: boolean const: false msg: type: string code: type: string data: {} detail: {} error: {} description: >- Error fields vary for forwarded responses. Check HTTP status and code when present. securitySchemes: ApiToken: type: apiKey in: header name: X-Cloud-Api-Token description: API token from your dashboard. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.