Overshoot Billing API

openapi: 3.1.0
info:
  title: Inference Service Billing API
  version: 0.4.0
  description: Pricing, prepaid balance, and checkout.
tags:
- name: Billing
  description: Pricing, prepaid balance, and checkout.
paths:
  /billing/pricing:
    get:
      tags:
      - Billing
      operationId: listPricing
      summary: List pricing
      description: 'List public model prices. No auth required. Money fields use **integer microcents**:

        `1 cent = 1,000,000 microcents`.

        '
      security: []
      servers:
      - url: https://api.overshoot.ai
      responses:
        '200':
          description: List of public prices.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Pricing'
  /billing/pricing/{model}:
    get:
      tags:
      - Billing
      operationId: getPricing
      summary: Get model pricing
      description: Return pricing for one model. The `model` path may contain slashes.
      security: []
      servers:
      - url: https://api.overshoot.ai
      parameters:
      - name: model
        in: path
        required: true
        schema:
          type: string
        description: Model identifier (may contain `/`).
      responses:
        '200':
          description: Pricing for the requested model.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Pricing'
        '404':
          description: Price not found.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /billing/accounts/me/balance:
    get:
      tags:
      - Billing
      operationId: getBalance
      summary: Get prepaid balance
      description: 'Return the authenticated user''s prepaid balance. `balance_cents` is for display;

        `balance_microcents` is the exact billing unit. Inference can return `402` when

        billing denies a request.

        '
      servers:
      - url: https://api.overshoot.ai
      responses:
        '200':
          description: Current balance.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BalanceResponse'
        '401':
          description: Missing or invalid API key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /billing/checkout:
    post:
      tags:
      - Billing
      operationId: createCheckout
      summary: Create checkout session
      description: 'Create a checkout session for buying prepaid credits. `amount_cents` must be at

        least `100`.

        '
      servers:
      - url: https://api.overshoot.ai
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CheckoutRequest'
      responses:
        '200':
          description: Checkout URL.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CheckoutResponse'
        '401':
          description: Missing or invalid API key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '422':
          description: Validation error.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ValidationError'
components:
  schemas:
    ValidationError:
      type: object
      description: Validation failure shape used by chat completions and billing.
      properties:
        error:
          type: string
          example: validation_error
        message:
          type: string
          example: Request validation failed
        details:
          type: array
          items:
            type: object
            properties:
              loc:
                type: array
                items:
                  type: string
              msg:
                type: string
              type:
                type: string
    Pricing:
      type: object
      properties:
        id:
          type: string
          format: uuid
        model:
          type: string
          example: google/gemma-4-26B-A4B-it
        provider:
          type: string
          example: google
        version:
          type: string
          example: '2026-06-01'
        input_microcents_per_token:
          type: integer
          example: 10
        output_microcents_per_token:
          type: integer
          example: 40
        cached_input_microcents_per_token:
          type: integer
          example: 2
        public:
          type: boolean
          example: true
      required:
      - id
      - model
      - provider
      - version
      - input_microcents_per_token
      - output_microcents_per_token
      - public
    CheckoutRequest:
      type: object
      properties:
        amount_cents:
          type: integer
          minimum: 100
          description: Amount to charge, in cents. Must be at least `100`.
      required:
      - amount_cents
    Error:
      type: object
      description: Standard error body used by stream-lifecycle and billing endpoints.
      properties:
        detail:
          type: string
      required:
      - detail
    BalanceResponse:
      type: object
      properties:
        user_id:
          type: string
          format: uuid
        balance_microcents:
          type: integer
          description: Exact billing unit. `1 cent = 1,000,000 microcents`.
        balance_cents:
          type: integer
          description: Display value.
      required:
      - user_id
      - balance_microcents
      - balance_cents
    CheckoutResponse:
      type: object
      properties:
        url:
          type: string
          description: Hosted checkout URL.
      required:
      - url
  securitySchemes:
    API Key:
      type: http
      description: Bearer <api_key>
      scheme: bearer