openapi: 3.2.0
info:
  title: AAAA Nexus Payments API
  version: 0.5.1
  description: Formally verified AI safety APIs for autonomous agents. Supports REST, MCP, A2A (Google protocol), and x402 micropayment protocol.
  contact:
    email: atomadic69@gmail.com
    url: https://github.com/atomadictech/aaaa-nexus
servers:
- url: https://atomadic.tech
  description: Production
security: []
tags:
- name: Payments
  description: Stripe payment sessions, price listing, and payment verification
paths:
  /v1/payments/stripe/session:
    post:
      operationId: createStripeSession
      summary: Create Stripe Checkout session
      description: Create a Stripe Checkout session for purchasing credit or prompt packs. No authentication required.
      tags:
      - Payments
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - price_id
              properties:
                price_id:
                  type: string
                  description: Stripe price ID
                success_url:
                  type: string
                cancel_url:
                  type: string
      responses:
        '200':
          description: Stripe Checkout session
          content:
            application/json:
              schema:
                type: object
                properties:
                  session_id:
                    type: string
                  url:
                    type: string
        '400':
          $ref: '#/components/responses/BadRequest'
  /v1/payments/stripe/prices:
    get:
      operationId: getStripePrices
      summary: List active Stripe prices
      description: List all active Stripe prices for credit and prompt packs. No authentication required.
      tags:
      - Payments
      responses:
        '200':
          description: Active Stripe prices
          content:
            application/json:
              schema:
                type: object
                properties:
                  prices:
                    type: array
                    items:
                      type: object
                      properties:
                        id:
                          type: string
                        name:
                          type: string
                        amount:
                          type: integer
                        currency:
                          type: string
                        credits:
                          type: integer
  /v1/pay/verify:
    post:
      operationId: verifyPayment
      summary: Verify payment and retrieve API key
      description: Verify a completed payment and retrieve the associated API key. No authentication required.
      tags:
      - Payments
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - session_id
              properties:
                session_id:
                  type: string
                  description: Stripe Checkout session ID
      responses:
        '200':
          description: Payment verified, API key returned
          content:
            application/json:
              schema:
                type: object
                properties:
                  verified:
                    type: boolean
                  api_key:
                    type: string
                  credits:
                    type: integer
        '400':
          $ref: '#/components/responses/BadRequest'
components:
  responses:
    BadRequest:
      description: Invalid request body or missing required fields.
      content:
        application/json:
          schema:
            type: object
            properties:
              error:
                type: string
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key obtained from https://atomadic.tech/pay
    X402PaymentProof:
      type: apiKey
      in: header
      name: X-Payment-Proof
      description: Base64-encoded USDC payment proof for x402 autonomous payment flow (Base L2, Polygon, or Solana)
    AdminTokenAuth:
      type: apiKey
      in: header
      name: X-Admin-Token
      description: Admin token for privileged operations