openapi: 3.2.0
info:
  title: AAAA Nexus Delegation 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: Delegation
  description: UCAN delegation chain validation, revocation, and depth queries
paths:
  /v1/delegation/validate:
    post:
      operationId: validateDelegation
      summary: Validate UCAN delegation chain
      description: Validate a UCAN delegation chain for correctness and authorization.
      tags:
      - Delegation
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - token
              properties:
                token:
                  type: string
                  description: UCAN token to validate
      responses:
        '200':
          description: Delegation validation result
          content:
            application/json:
              schema:
                type: object
                properties:
                  valid:
                    type: boolean
                  chain_depth:
                    type: integer
                  issuer:
                    type: string
                  audience:
                    type: string
                  capabilities:
                    type: array
                    items:
                      type: string
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/delegation/chain:
    get:
      operationId: getDelegationChain
      summary: Get delegation chain
      description: Get the full delegation chain for an agent.
      tags:
      - Delegation
      parameters:
      - name: agent_id
        in: query
        required: true
        schema:
          type: string
        description: Agent identifier
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Delegation chain
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  chain:
                    type: array
                    items:
                      type: object
                  depth:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/delegation/revoke:
    post:
      operationId: revokeDelegation
      summary: Revoke delegation
      description: Revoke a delegation, invalidating the entire sub-chain.
      tags:
      - Delegation
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - token
              properties:
                token:
                  type: string
      responses:
        '200':
          description: Delegation revoked
          content:
            application/json:
              schema:
                type: object
                properties:
                  revoked:
                    type: boolean
                  revoked_at:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/delegation/list:
    get:
      operationId: listDelegations
      summary: List delegations
      description: List all delegations for an agent.
      tags:
      - Delegation
      parameters:
      - name: agent_id
        in: query
        required: true
        schema:
          type: string
        description: Agent identifier
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Delegations list
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  delegations:
                    type: array
                    items:
                      type: object
                  total:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/delegation/depth:
    get:
      operationId: getDelegationDepth
      summary: Get delegation depth
      description: Get the delegation depth for an agent.
      tags:
      - Delegation
      parameters:
      - name: agent_id
        in: query
        required: true
        schema:
          type: string
        description: Agent identifier
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Delegation depth
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  depth:
                    type: integer
                  max_allowed:
                    type: integer
        '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