openapi: 3.2.0
info:
  title: AAAA Nexus Agents 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: Agents
  description: Agent registration, topology, planning, intent classification, and reputation
paths:
  /v1/agents/register:
    post:
      operationId: registerAgent
      summary: Register an agent
      description: Register an agent in the swarm topology. Compatible with the Google A2A protocol. No authentication required.
      tags:
      - Agents
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - agent_id
              - capabilities
              properties:
                agent_id:
                  type: string
                  example: my-agent-001
                capabilities:
                  type: array
                  items:
                    type: string
                  example:
                  - inference
                  - planning
                  - code-generation
      responses:
        '200':
          description: Agent registered successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                    example: my-agent-001
                  registered_at:
                    type: string
                    format: date-time
                    example: '2026-04-09T14:30:00Z'
                  status:
                    type: string
                    example: active
                  capabilities:
                    type: array
                    items:
                      type: string
                    example:
                    - inference
                    - planning
              example:
                agent_id: my-agent-001
                registered_at: '2026-04-09T14:30:00Z'
                status: active
                capabilities:
                - inference
                - planning
        '400':
          $ref: '#/components/responses/BadRequest'
  /v1/agents/topology:
    get:
      operationId: getSwarmTopology
      summary: Live swarm topology
      description: Returns live swarm topology statistics for all registered agents. No authentication required.
      tags:
      - Agents
      responses:
        '200':
          description: Swarm topology
          content:
            application/json:
              schema:
                type: object
                properties:
                  agents:
                    type: integer
                    example: 1247
                  edges:
                    type: integer
                    example: 3891
                  average_degree:
                    type: number
                    format: float
                    example: 3.1
                  components:
                    type: integer
                    example: 5
                  largest_component_size:
                    type: integer
                    example: 1240
              example:
                agents: 1247
                edges: 3891
                average_degree: 3.1
                components: 5
                largest_component_size: 1240
  /v1/agents/status:
    get:
      operationId: getAgentStatus
      summary: Agent status lookup
      description: Look up the current status of a registered agent.
      tags:
      - Agents
      parameters:
      - name: agent_id
        in: query
        required: true
        schema:
          type: string
        description: Agent identifier
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Agent status
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  status:
                    type: string
                    enum:
                    - active
                    - inactive
                    - suspended
                  last_seen:
                    type: string
                    format: date-time
                  uptime_s:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/capabilities:
    get:
      operationId: getAgentCapabilities
      summary: List agent capabilities
      description: List the registered capabilities for a specific agent.
      tags:
      - Agents
      parameters:
      - name: agent_id
        in: query
        required: true
        schema:
          type: string
        description: Agent identifier
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Agent capabilities
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  capabilities:
                    type: array
                    items:
                      type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/search:
    get:
      operationId: searchAgents
      summary: Search agents by capability
      description: Search for agents that provide a specific capability.
      tags:
      - Agents
      parameters:
      - name: capability
        in: query
        required: true
        schema:
          type: string
        description: Capability to search for
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Matching agents
          content:
            application/json:
              schema:
                type: object
                properties:
                  agents:
                    type: array
                    items:
                      type: object
                      properties:
                        agent_id:
                          type: string
                        capabilities:
                          type: array
                          items:
                            type: string
                        status:
                          type: string
                  total:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/health:
    get:
      operationId: getAgentHealth
      summary: Agent health check
      description: Check the health status of a specific agent.
      tags:
      - Agents
      parameters:
      - name: agent_id
        in: query
        required: true
        schema:
          type: string
        description: Agent identifier
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Agent health status
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  healthy:
                    type: boolean
                  last_heartbeat:
                    type: string
                    format: date-time
                  latency_ms:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/discover:
    get:
      operationId: discoverAgents
      summary: Discover agents (A2A compatible)
      description: Discover available agents in the network. Compatible with Google A2A discovery protocol.
      tags:
      - Agents
      responses:
        '200':
          description: List of discoverable agents
          content:
            application/json:
              schema:
                type: object
                properties:
                  agents:
                    type: array
                    items:
                      type: object
                      properties:
                        agent_id:
                          type: string
                        capabilities:
                          type: array
                          items:
                            type: string
                        status:
                          type: string
  /v1/agents/update:
    post:
      operationId: updateAgent
      summary: Update agent capabilities
      description: Update the capabilities and metadata of a registered agent.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - agent_id
              properties:
                agent_id:
                  type: string
                  example: my-agent-001
                capabilities:
                  type: array
                  items:
                    type: string
                metadata:
                  type: object
      responses:
        '200':
          description: Agent updated
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  updated_at:
                    type: string
                    format: date-time
                  status:
                    type: string
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/deregister:
    post:
      operationId: deregisterAgent
      summary: Deregister an agent
      description: Remove an agent from the swarm topology.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - agent_id
              properties:
                agent_id:
                  type: string
                  example: my-agent-001
      responses:
        '200':
          description: Agent deregistered
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  deregistered_at:
                    type: string
                    format: date-time
                  status:
                    type: string
                    example: deregistered
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/message:
    post:
      operationId: messageAgent
      summary: Send direct message to agent
      description: Send a direct message to a specific agent in the swarm.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - target_agent_id
              - message
              properties:
                target_agent_id:
                  type: string
                message:
                  type: object
                sender_agent_id:
                  type: string
      responses:
        '200':
          description: Message delivered
          content:
            application/json:
              schema:
                type: object
                properties:
                  message_id:
                    type: string
                  delivered:
                    type: boolean
                  timestamp:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/negotiate:
    post:
      operationId: negotiateAgents
      summary: Negotiate terms between agents
      description: Negotiate terms and conditions between two agents for a collaborative task.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - initiator_id
              - responder_id
              - terms
              properties:
                initiator_id:
                  type: string
                responder_id:
                  type: string
                terms:
                  type: object
      responses:
        '200':
          description: Negotiation result
          content:
            application/json:
              schema:
                type: object
                properties:
                  negotiation_id:
                    type: string
                  status:
                    type: string
                    enum:
                    - accepted
                    - rejected
                    - pending
                  agreed_terms:
                    type: object
                  timestamp:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/delegate:
    post:
      operationId: delegateTask
      summary: Delegate task to another agent
      description: Delegate a task to another agent in the swarm network.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - from_agent_id
              - to_agent_id
              - task
              properties:
                from_agent_id:
                  type: string
                to_agent_id:
                  type: string
                task:
                  type: object
      responses:
        '200':
          description: Task delegated
          content:
            application/json:
              schema:
                type: object
                properties:
                  delegation_id:
                    type: string
                  status:
                    type: string
                  timestamp:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/semantic-diff:
    post:
      operationId: semanticDiff
      summary: Semantic diff between agent outputs
      description: Compute a semantic diff between two agent outputs to identify meaningful differences. Costs $0.04/call.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - output_a
              - output_b
              properties:
                output_a:
                  type: string
                output_b:
                  type: string
                context:
                  type: string
      responses:
        '200':
          description: Semantic diff result
          content:
            application/json:
              schema:
                type: object
                properties:
                  similarity_score:
                    type: number
                    format: float
                  differences:
                    type: array
                    items:
                      type: object
                  summary:
                    type: string
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/contradiction:
    post:
      operationId: detectContradiction
      summary: Detect contradictions in agent outputs
      description: Detect logical contradictions between agent outputs. Costs $0.02/call.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - statements
              properties:
                statements:
                  type: array
                  items:
                    type: string
                  example:
                  - The model accuracy is 95%
                  - The model fails 20% of the time
      responses:
        '200':
          description: Contradiction detection result
          content:
            application/json:
              schema:
                type: object
                properties:
                  contradictions_found:
                    type: boolean
                  contradictions:
                    type: array
                    items:
                      type: object
                  confidence:
                    type: number
                    format: float
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/swarm/inbox:
    get:
      operationId: pollSwarmInbox
      summary: Poll swarm inbox
      description: Poll queued messages for the registered agent. No authentication required.
      tags:
      - Agents
      responses:
        '200':
          description: Queued messages
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
  /v1/agents/plan:
    post:
      operationId: planAgentGoal
      summary: Autonomous agent goal planning
      description: Decompose a goal into an action plan for autonomous agent execution. Costs $0.015/call.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - goal
              properties:
                goal:
                  type: string
                  example: Deploy a web service with zero downtime
                constraints:
                  type: object
                  description: Optional constraints for the plan (e.g., time limits, resource caps)
                  additionalProperties: true
      responses:
        '200':
          description: Goal decomposition and action plan
          content:
            application/json:
              schema:
                type: object
                properties:
                  goal:
                    type: string
                  steps:
                    type: array
                    items:
                      type: object
                      properties:
                        step:
                          type: integer
                        action:
                          type: string
                        description:
                          type: string
                  estimated_complexity:
                    type: string
                  timestamp:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/intent-classify:
    post:
      operationId: classifyAgentIntent
      summary: Agent intent classification
      description: Classify agent intent from natural language text. Returns the top-3 intent classifications. Costs $0.005/call.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - text
              properties:
                text:
                  type: string
                  example: I need to fetch user data and store it in the database
      responses:
        '200':
          description: Top-3 intent classifications
          content:
            application/json:
              schema:
                type: object
                properties:
                  text:
                    type: string
                  intents:
                    type: array
                    maxItems: 3
                    items:
                      type: object
                      properties:
                        intent:
                          type: string
                        confidence:
                          type: number
                          format: float
                  timestamp:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/agents/reputation:
    post:
      operationId: getAgentReputation
      summary: Agent reputation and trust score
      description: Get the A2A trust score and compliance status for an agent. Costs $0.010/call.
      tags:
      - Agents
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - agent_id
              properties:
                agent_id:
                  type: string
                  example: my-agent-001
      responses:
        '200':
          description: Agent reputation result
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  trust_score:
                    type: number
                    format: float
                  compliance_status:
                    type: string
                    enum:
                    - compliant
                    - non_compliant
                    - unknown
                  interactions:
                    type: integer
                  timestamp:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '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