openapi: 3.2.0
info:
  title: AAAA Nexus Audit 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: Audit
  description: Audit event logging, trail retrieval, and export
paths:
  /v1/audit/log:
    post:
      operationId: logAuditEvent
      summary: Log audit event
      description: Log an audit event. Costs $0.02/event.
      tags:
      - Audit
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - event_type
              - details
              properties:
                event_type:
                  type: string
                actor:
                  type: string
                details:
                  type: object
      responses:
        '200':
          description: Audit event logged
          content:
            application/json:
              schema:
                type: object
                properties:
                  event_id:
                    type: string
                  logged_at:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/audit/trail:
    get:
      operationId: getAuditTrail
      summary: Retrieve audit trail
      description: Retrieve the audit trail. Costs $0.02/query.
      tags:
      - Audit
      parameters:
      - name: actor
        in: query
        schema:
          type: string
        description: Filter by actor
      - name: event_type
        in: query
        schema:
          type: string
        description: Filter by event type
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Audit trail
          content:
            application/json:
              schema:
                type: object
                properties:
                  events:
                    type: array
                    items:
                      type: object
                      properties:
                        event_id:
                          type: string
                        event_type:
                          type: string
                        actor:
                          type: string
                        details:
                          type: object
                        timestamp:
                          type: string
                          format: date-time
                  total:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/audit/export:
    get:
      operationId: exportAuditLog
      summary: Export audit log
      description: Export the full audit log. Costs $0.08/export.
      tags:
      - Audit
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Audit log export
          content:
            application/json:
              schema:
                type: object
                properties:
                  export_id:
                    type: string
                  events:
                    type: array
                    items:
                      type: object
                  total:
                    type: integer
                  exported_at:
                    type: string
                    format: date-time
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
components:
  responses:
    PaymentRequired:
      description: 'Payment required. Use x402 protocol: send USDC on Base L2, Polygon, or Solana to the treasury address provided in the response, then retry with the X-Payment-Proof header.'
      content:
        application/json:
          schema:
            type: object
            properties:
              error:
                type: string
                example: Payment required
              amount:
                type: string
                example: '0.002'
              currency:
                type: string
                example: USDC
              treasury:
                type: string
                description: Destination wallet address
              chains:
                type: array
                items:
                  type: string
                example:
                - base
                - polygon
                - solana
    BadRequest:
      description: Invalid request body or missing required fields.
      content:
        application/json:
          schema:
            type: object
            properties:
              error:
                type: string
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            type: object
            properties:
              error:
                type: string
                example: Unauthorized
  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