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

# Check usage availability

> Check if a customer can consume a feature before actual consumption. Returns availability and cost estimates based on the plan's consumption model.

Check if a customer can consume a feature before actual consumption. Returns availability and cost estimates based on the plan's consumption model.


## OpenAPI

````yaml /openapi/es/rest/2026-08-27.json post /usage/check
openapi: 3.1.0
info:
  title: Commet API
  version: '2026-08-27'
  description: Billing and payments API for SaaS and AI products.
servers:
  - url: https://commet.co/api/v1
security:
  - ApiKeyAuth: []
tags:
  - name: Test Clock
    description: >-
      Simulate the passage of time in sandbox to test billing flows. Mirrors
      Stripe test clocks: forward-only and sandbox-only.
  - name: Customers
  - name: Subscriptions
  - name: Plans
  - name: Markets
    description: >-
      Reusable country groups for market-specific prices and selectable price
      variants.
  - name: Offers
  - name: Promo Codes
  - name: Features
  - name: Usage
  - name: Seats
  - name: Quota
  - name: Add-ons
  - name: Portal
  - name: Credit Packs
  - name: Plan Groups
  - name: Invoices
  - name: Payments
    description: >-
      One-time payments with no subscription or plan. Charge a customer's saved
      payment method off-session, or create a payment link the customer opens to
      pay. Tax, invoice, and receipt are handled automatically.
  - name: Transactions
  - name: Webhooks
  - name: API Keys
  - name: Payouts
    description: >-
      Withdraw available balance to your bank and manage the payout account
      (verification + destination bank accounts).
  - name: Provisioning
    description: >-
      Take ownership of an organization an agent provisioned headlessly. The
      agent holds the API keys from the start; a human claims the account
      through a claim link.
paths:
  /usage/check:
    post:
      tags:
        - Usage
      summary: Check usage availability
      description: >-
        Check if a customer can consume a feature before actual consumption.
        Returns availability and cost estimates based on the plan's consumption
        model.
      operationId: check-usage-availability
      parameters:
        - name: Idempotency-Key
          in: header
          required: false
          description: >-
            Unique key used to safely retry this write for 24 hours without
            applying it twice.
          schema:
            type: string
            minLength: 1
            maxLength: 200
        - name: Commet-Version
          in: header
          required: false
          description: >-
            API version used by this reference. Send this header to select this
            contract explicitly.
          schema:
            type: string
            default: '2026-08-27'
          example: '2026-08-27'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                customerId:
                  type: string
                  minLength: 1
                  maxLength: 200
                featureCode:
                  type: string
                  minLength: 1
                  maxLength: 50
                  pattern: ^[a-z0-9_]+$
                quantity:
                  default: 1
                  type: integer
                  exclusiveMinimum: 0
                  maximum: 9007199254740991
              required:
                - customerId
                - featureCode
      responses:
        '200':
          description: Success
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
            RateLimit-Limit:
              description: Maximum number of requests allowed in the current window.
              schema:
                type: string
            RateLimit-Remaining:
              description: Requests remaining in the current window.
              schema:
                type: string
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UsageCheck'
              example:
                allowed: true
                subscriptionStatus: active
                featureCode: api_calls
                quantity: 1
                consumptionModel: metered
                current: 250
                remaining: 750
                unlimited: false
                included: 1000
                overageEnabled: false
                overageUnitPrice: null
                object: usage_check
                livemode: false
        '400':
          description: Bad request
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: validation_error
                  code: validation_error
                  message: The request contains an invalid parameter.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/validation_error.md
        '401':
          description: Unauthorized
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: authentication_error
                  code: unauthorized
                  message: A valid API key is required.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/unauthorized.md
        '403':
          description: Forbidden
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: authentication_error
                  code: forbidden
                  message: You do not have permission to perform this operation.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/forbidden.md
        '404':
          description: Not found
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: not_found_error
                  code: not_found
                  message: The requested resource was not found.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/not_found.md
        '409':
          description: Conflict
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: conflict_error
                  code: idempotency_in_progress
                  message: >-
                    A request with this idempotency key is still being
                    processed.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/idempotency_in_progress.md
        '422':
          description: Unprocessable entity
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: validation_error
                  code: validation_error
                  message: >-
                    The requested operation is not valid for the current
                    configuration.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/validation_error.md
        '429':
          description: Too many requests
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
            RateLimit-Limit:
              description: Maximum number of requests allowed in the current window.
              schema:
                type: string
            RateLimit-Remaining:
              description: Requests remaining in the current window.
              schema:
                type: string
            RateLimit-Reset:
              description: Seconds until the rate limit window resets.
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying the request.
              schema:
                type: string
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: rate_limit_error
                  code: rate_limited
                  message: >-
                    Too many requests. Retry after the interval specified in the
                    Retry-After header.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/rate_limited.md
        '500':
          description: Internal server error
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: internal_error
                  code: internal_error
                  message: An unexpected error occurred while processing the request.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/internal_error.md
        '503':
          description: Service unavailable
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: internal_error
                  code: idempotency_unavailable
                  message: >-
                    Idempotency storage is temporarily unavailable. Retry with
                    the same idempotency key.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/idempotency_unavailable.md
      x-codeSamples:
        - lang: typescript
          label: TypeScript
          source: |-
            import { Commet } from "@commet/node";

            const commet = new Commet({ apiKey: "ck_xxx" });

            const usageCheck = await commet.usage.check({
              customerId: "user_123",
              featureCode: "api_calls",
            });
        - lang: python
          label: Python
          source: |-
            from commet import Commet

            commet = Commet("ck_xxx")

            usage_check = commet.usage.check(
                customer_id="user_123",
                feature_code="api_calls",
            )
        - lang: go
          label: Go
          source: "client, err := commet.New(\"ck_xxx\")\nif err != nil {\n\tlog.Fatal(err)\n}\nctx := context.Background()\n\nusageCheck, err := client.Usage.Check(ctx, &commet.CheckUsageAvailabilityParams{\n\tCustomerID: \"user_123\",\n\tFeatureCode: \"api_calls\",\n})\nif err != nil {\n\tlog.Fatal(err)\n}"
        - lang: java
          label: Java
          source: |-
            import co.commet.Commet;
            import co.commet.params.CheckUsageAvailabilityParams;

            var commet = Commet.builder().apiKey("ck_xxx").build();

            var usageCheck = commet.usage().check(
                CheckUsageAvailabilityParams.builder("user_123", "api_calls").build()
            );
        - lang: php
          label: PHP
          source: |-
            use Commet\Commet;

            $commet = new Commet('ck_xxx');

            $usageCheck = $commet->usage->check(
                customerId: 'user_123',
                featureCode: 'api_calls',
            );
components:
  headers:
    RequestId:
      description: >-
        Server-generated identifier that correlates this response with Platform
        logs.
      schema:
        type: string
        format: uuid
  schemas:
    UsageCheck:
      oneOf:
        - type: object
          properties:
            allowed:
              type: boolean
            subscriptionStatus:
              type: string
            featureCode:
              type: string
            quantity:
              type: integer
              minimum: -9007199254740991
              maximum: 9007199254740991
            reason:
              type: string
            message:
              type: string
            consumptionModel:
              type: string
              const: metered
            current:
              type: number
            remaining:
              type: number
            unlimited:
              type: boolean
            included:
              type: number
            overageEnabled:
              type: boolean
            overageUnitPrice:
              anyOf:
                - type: number
                - type: 'null'
            object:
              type: string
              const: usage_check
            livemode:
              type: boolean
          required:
            - allowed
            - subscriptionStatus
            - featureCode
            - quantity
            - consumptionModel
            - current
            - remaining
            - unlimited
            - included
            - overageEnabled
            - overageUnitPrice
            - object
            - livemode
          additionalProperties: false
        - type: object
          properties:
            allowed:
              type: boolean
            subscriptionStatus:
              type: string
            featureCode:
              type: string
            quantity:
              type: integer
              minimum: -9007199254740991
              maximum: 9007199254740991
            reason:
              type: string
            message:
              type: string
            consumptionModel:
              type: string
              const: credits
            creditsPerUnit:
              type: integer
              minimum: -9007199254740991
              maximum: 9007199254740991
            estimatedCredits:
              type: integer
              minimum: -9007199254740991
              maximum: 9007199254740991
            planCredits:
              type: integer
              minimum: -9007199254740991
              maximum: 9007199254740991
            purchasedCredits:
              type: integer
              minimum: -9007199254740991
              maximum: 9007199254740991
            totalCredits:
              type: integer
              minimum: -9007199254740991
              maximum: 9007199254740991
            object:
              type: string
              const: usage_check
            livemode:
              type: boolean
          required:
            - allowed
            - subscriptionStatus
            - featureCode
            - quantity
            - consumptionModel
            - creditsPerUnit
            - estimatedCredits
            - planCredits
            - purchasedCredits
            - totalCredits
            - object
            - livemode
          additionalProperties: false
        - type: object
          properties:
            allowed:
              type: boolean
            subscriptionStatus:
              type: string
            featureCode:
              type: string
            quantity:
              type: integer
              minimum: -9007199254740991
              maximum: 9007199254740991
            reason:
              type: string
            message:
              type: string
            consumptionModel:
              type: string
              const: balance
            unitPrice:
              type: number
            estimatedAmount:
              type: number
            currentBalance:
              type: number
            blockOnExhaustion:
              type: boolean
            currency:
              type: string
            object:
              type: string
              const: usage_check
            livemode:
              type: boolean
          required:
            - allowed
            - subscriptionStatus
            - featureCode
            - quantity
            - consumptionModel
            - unitPrice
            - estimatedAmount
            - currentBalance
            - blockOnExhaustion
            - currency
            - object
            - livemode
          additionalProperties: false
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            type:
              type: string
            code:
              type: string
            message:
              type: string
            param:
              type: string
            details: {}
            doc_url:
              type: string
          required:
            - type
            - code
            - message
            - doc_url
          additionalProperties: false
      required:
        - error
      additionalProperties: false
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key

````

## Related topics

- [Remove an Offer from a pending checkout](/docs/es/api-reference/subscriptions/remove-subscription-offer.md)
- [Configurar features](/docs/es/configure-features.md)
- [Get feature access](/docs/es/api-reference/features/get-feature-access.md)
- [Registrar uso](/docs/es/track-usage.md)
- [CLI](/docs/es/cli.md)


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