openapi: 3.2.0
info:
  title: AAAA Nexus UCAN 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: UCAN
  description: UCAN token creation, verification, revocation, and delegation
paths:
  /v1/ucan/create:
    post:
      operationId: createUcan
      summary: Create UCAN token
      description: Create a new UCAN token with specified capabilities.
      tags:
      - UCAN
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - issuer
              - audience
              - capabilities
              properties:
                issuer:
                  type: string
                audience:
                  type: string
                capabilities:
                  type: array
                  items:
                    type: object
                expiration:
                  type: integer
                  description: Unix timestamp
      responses:
        '200':
          description: UCAN token created
          content:
            application/json:
              schema:
                type: object
                properties:
                  token:
                    type: string
                  issuer:
                    type: string
                  audience:
                    type: string
                  expires_at:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/ucan/verify:
    post:
      operationId: verifyUcan
      summary: Verify UCAN token
      description: Verify a UCAN token and its delegation chain.
      tags:
      - UCAN
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - token
              properties:
                token:
                  type: string
      responses:
        '200':
          description: UCAN verification result
          content:
            application/json:
              schema:
                type: object
                properties:
                  valid:
                    type: boolean
                  issuer:
                    type: string
                  audience:
                    type: string
                  capabilities:
                    type: array
                    items:
                      type: object
                  expired:
                    type: boolean
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/ucan/revoke:
    post:
      operationId: revokeUcan
      summary: Revoke UCAN token
      description: Revoke a UCAN token.
      tags:
      - UCAN
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - token
              properties:
                token:
                  type: string
      responses:
        '200':
          description: UCAN 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/ucan/delegate:
    post:
      operationId: delegateUcan
      summary: Create delegated UCAN
      description: Create a delegated UCAN token from an existing token, narrowing capabilities.
      tags:
      - UCAN
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - parent_token
              - audience
              - capabilities
              properties:
                parent_token:
                  type: string
                audience:
                  type: string
                capabilities:
                  type: array
                  items:
                    type: object
                expiration:
                  type: integer
      responses:
        '200':
          description: Delegated UCAN created
          content:
            application/json:
              schema:
                type: object
                properties:
                  token:
                    type: string
                  parent_issuer:
                    type: string
                  audience:
                    type: string
                  depth:
                    type: integer
        '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