openapi: 3.2.0
info:
  title: BuiltWith Agent Stripe Credit Top-Up API via aliases Mppx API
  version: 1.1.0
  description: Authenticated aliases that charge an existing account's saved Stripe method and add account API credits. This is not x402 and does not use payment challenges.
servers:
- url: https://api.builtwith.com
tags:
- name: Mppx
paths:
  /mppx/api-discovery:
    get:
      operationId: getStripeTopUpBalance
      summary: Account API credit balance
      security:
      - agentBillingKey: []
      responses:
        '200':
          description: Current account API credit balance
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DiscoveryResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
      tags:
      - Mppx
  /mppx/api-configuration:
    get:
      operationId: getStripeTopUpConfiguration
      summary: Spending limits and purchase rules
      security:
      - agentBillingKey: []
      responses:
        '200':
          description: Configured spending limits, UTC period and purchase rules
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ConfigurationResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
      tags:
      - Mppx
  /mppx/api-purchase:
    post:
      operationId: purchaseAccountCreditsWithStripe
      summary: Charge saved Stripe method and add account API credits
      description: Requires the separately scoped Agent Billing Key and a unique Idempotency-Key. Reuse the same key only when retrying the identical purchase. Quantities are fixed increments of 2,000 credits.
      security:
      - agentBillingKey: []
      parameters:
      - name: Idempotency-Key
        in: header
        required: true
        schema:
          type: string
          minLength: 8
          maxLength: 200
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PurchaseRequest'
      responses:
        '200':
          description: Credits purchased or the original response replayed
          headers:
            Idempotency-Replayed:
              schema:
                type: boolean
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PurchaseResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentFailed'
        '403':
          $ref: '#/components/responses/Forbidden'
        '409':
          $ref: '#/components/responses/Conflict'
      tags:
      - Mppx
components:
  responses:
    Conflict:
      description: Idempotency key is in progress or conflicts with an earlier request
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid Agent Billing Key
      headers:
        WWW-Authenticate:
          schema:
            type: string
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Validation failure
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    PaymentFailed:
      description: Stripe payment failed or no chargeable payment method is on file
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Forbidden:
      description: Billing credential required, account suspended, or spending permission denied
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    ConfigurationResponse:
      type: object
      properties:
        max_per_purchase:
          type: integer
        max_monthly:
          type: integer
        monthly_purchased:
          type: integer
        monthly_remaining:
          type: integer
        monthly_reset_timezone:
          const: UTC
        purchase_increment:
          const: 2000
        idempotency_key_required:
          const: true
    DiscoveryResponse:
      type: object
      properties:
        service:
          type: string
        payment_processor:
          const: Stripe saved payment method
        is_x402:
          const: false
        credits_total:
          type: number
        credits_used:
          type: number
        credits_available:
          type: number
    Error:
      type: object
      required:
      - success
      - code
      - error
      properties:
        success:
          const: false
        code:
          type: string
        error:
          type: string
        details:
          type: object
    PurchaseResponse:
      type: object
      required:
      - success
      - credits_purchased
      - cost_usd
      - payment_id
      - credits_available
      properties:
        success:
          const: true
        idempotency_replayed:
          type: boolean
        credits_purchased:
          type: integer
        cost_usd:
          type: number
        payment_id:
          type: string
        credits_available:
          type: number
    PurchaseRequest:
      type: object
      additionalProperties: false
      required:
      - credits
      properties:
        credits:
          type: integer
          minimum: 2000
          multipleOf: 2000
  securitySchemes:
    agentBillingKey:
      type: http
      scheme: bearer
      description: Separately scoped Agent Billing Key from payments.builtwith.com/agent-payment-api-config. General API keys and temporary bw- tokens cannot purchase.
externalDocs:
  description: Agent Stripe Credit Top-Up documentation
  url: https://api.builtwith.com/agent-payment-api