openapi: 3.2.0
info:
  title: Machine Library Payments API
  description: 'Search, retrieve, and synthesize scholarly and public-interest documents through Machine Library, the search and AI product by Space Frontiers Company. Document recognition endpoints (`/v1/recognitions`: PDF, EPUB, and DJVU to structured Markdown) share this host and are described at `/v1/recognitions/docs/openapi.json`; the site reference at https://machinelibrary.ai/docs/api/reference presents both specs merged.'
  license:
    name: MIT
    identifier: MIT
  version: 0.1.0
servers:
- url: https://api.machinelibrary.ai
  description: Machine Library
- url: https://api.spacefrontiers.org
  description: Space Frontiers (compatible endpoint)
tags:
- name: Payments
paths:
  /v2/payments/mpp/top-up:
    post:
      tags:
      - Payments
      operationId: createMppBalanceTopUp
      summary: Fund the authenticated account balance using Stripe MPP
      description: The first authenticated request returns a Stripe MPP challenge. Retry the same request with the resulting Payment credential to settle and credit the existing USD balance.
      security:
      - bearer_auth: []
      - api_key: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - package
              properties:
                package:
                  type: string
                  enum:
                  - usd-5
                  - usd-10
                  - usd-25
                  - usd-50
                  - usd-100
                  - usd-250
                  - usd-500
                  - usd-1000
      x-payment-info:
        intent: charge
        method: stripe
        amount: '500'
        currency: usd
        description: Prepaid-credit packages from $5 to $1000; select one in the request body.
        offers:
        - intent: charge
          method: stripe
          amount: '500'
          currency: usd
          description: Prepaid-credit package usd-5; select it in the request body.
        - intent: charge
          method: stripe
          amount: '1000'
          currency: usd
          description: Prepaid-credit package usd-10; select it in the request body.
        - intent: charge
          method: stripe
          amount: '2500'
          currency: usd
          description: Prepaid-credit package usd-25; select it in the request body.
        - intent: charge
          method: stripe
          amount: '5000'
          currency: usd
          description: Prepaid-credit package usd-50; select it in the request body.
        - intent: charge
          method: stripe
          amount: '10000'
          currency: usd
          description: Prepaid-credit package usd-100; select it in the request body.
        - intent: charge
          method: stripe
          amount: '25000'
          currency: usd
          description: Prepaid-credit package usd-250; select it in the request body.
        - intent: charge
          method: stripe
          amount: '50000'
          currency: usd
          description: Prepaid-credit package usd-500; select it in the request body.
        - intent: charge
          method: stripe
          amount: '100000'
          currency: usd
          description: Prepaid-credit package usd-1000; select it in the request body.
      responses:
        '200':
          description: Payment settled and balance credited.
        '400':
          description: Malformed package or Payment credential.
        '401':
          description: Missing or invalid account credential.
        '402':
          description: MPP payment challenge or verification failure.
          headers:
            WWW-Authenticate:
              schema:
                type: string
        '409':
          description: Payment is already being processed.
        '503':
          description: Agent payments are temporarily disabled.
components:
  securitySchemes:
    api_key:
      type: apiKey
      in: header
      name: X-Api-Key
      description: Machine Library API key from https://machinelibrary.ai/keys.
    bearer_auth:
      type: http
      scheme: bearer
      bearerFormat: API key or OAuth 2.0 access token
      description: Send the same API key, or an OAuth 2.0 access token, as a Bearer token.
x-service-info:
  categories:
  - data
  - search
  docs:
    apiReference: https://machinelibrary.ai/docs/api/reference
    homepage: https://machinelibrary.ai
    llms: https://machinelibrary.ai/llms.txt