openapi: 3.2.0
info:
  title: AAAA Nexus Protocol 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: Protocol
  description: 'Protocol discovery endpoints: MCP and A2A agent card'
paths:
  /.well-known/agent.json:
    get:
      operationId: getAgentCard
      summary: A2A agent card
      description: Returns the Google A2A protocol agent card for agent discovery and capability advertisement.
      tags:
      - Protocol
      responses:
        '200':
          description: A2A agent card
          content:
            application/json:
              schema:
                type: object
  /.well-known/mcp.json:
    get:
      operationId: getMcpManifest
      summary: MCP server manifest
      description: Returns the MCP server manifest for client auto-discovery.
      tags:
      - Protocol
      responses:
        '200':
          description: MCP server manifest
          content:
            application/json:
              schema:
                type: object
  /.well-known/ai-plugin.json:
    get:
      operationId: getAiPluginManifest
      summary: OpenAI plugin manifest
      description: Returns the OpenAI plugin manifest for ChatGPT plugin discovery.
      tags:
      - Protocol
      responses:
        '200':
          description: OpenAI plugin manifest
          content:
            application/json:
              schema:
                type: object
  /.well-known/agent-card.json:
    get:
      operationId: getAgentCardAlt
      summary: Alternative A2A agent card path
      description: Alternative path for the A2A agent card, for compatibility with various A2A client implementations.
      tags:
      - Protocol
      responses:
        '200':
          description: A2A agent card
          content:
            application/json:
              schema:
                type: object
  /mcp:
    post:
      operationId: mcpEndpoint
      summary: MCP server endpoint
      description: 'Model Context Protocol (MCP) endpoint. Available tools: health, metrics, oracle_entropy, oracle_hallucination, ratchetgate_session, ratchetgate_register, ratchetgate_advance, inference, inference_stream.'
      tags:
      - Protocol
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
      responses:
        '200':
          description: MCP response
          content:
            application/json:
              schema:
                type: object
  /a2a:
    post:
      operationId: a2aEndpoint
      summary: A2A agent-to-agent endpoint
      description: 'Google Agent-to-Agent (A2A) protocol endpoint. Supports methods: message/send, tasks/get.'
      tags:
      - Protocol
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - jsonrpc
              - method
              - id
              properties:
                jsonrpc:
                  type: string
                  enum:
                  - '2.0'
                method:
                  type: string
                  enum:
                  - message/send
                  - tasks/get
                params:
                  type: object
                id:
                  type: string
            example:
              jsonrpc: '2.0'
              method: message/send
              params:
                message:
                  role: user
                  parts:
                  - type: text
                    text: Check health
              id: '1'
      responses:
        '200':
          description: A2A JSON-RPC response
          content:
            application/json:
              schema:
                type: object
                properties:
                  jsonrpc:
                    type: string
                  result:
                    type: object
                  id:
                    type: string
components:
  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