openapi: 3.2.0
info:
  title: AAAA Nexus Escrow 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: Escrow
  description: 'Agent-to-agent escrow: create, release, dispute, status'
paths:
  /v1/escrow/create:
    post:
      operationId: createEscrow
      summary: Create agent-to-agent escrow
      description: Create an escrow between two agents. Costs $0.04/call.
      tags:
      - Escrow
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - payer_id
              - payee_id
              - amount
              - currency
              properties:
                payer_id:
                  type: string
                payee_id:
                  type: string
                amount:
                  type: number
                currency:
                  type: string
                conditions:
                  type: object
      responses:
        '200':
          description: Escrow created
          content:
            application/json:
              schema:
                type: object
                properties:
                  escrow_id:
                    type: string
                  status:
                    type: string
                  created_at:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/escrow/release:
    post:
      operationId: releaseEscrow
      summary: Release escrowed funds
      description: Release escrowed funds to the payee. Costs $0.02/call.
      tags:
      - Escrow
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - escrow_id
              properties:
                escrow_id:
                  type: string
      responses:
        '200':
          description: Escrow released
          content:
            application/json:
              schema:
                type: object
                properties:
                  escrow_id:
                    type: string
                  status:
                    type: string
                    example: released
                  released_at:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/escrow/dispute:
    post:
      operationId: disputeEscrow
      summary: Open escrow dispute
      description: Open a dispute on an escrow. Costs $0.06/call.
      tags:
      - Escrow
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - escrow_id
              - reason
              properties:
                escrow_id:
                  type: string
                reason:
                  type: string
                evidence:
                  type: object
      responses:
        '200':
          description: Dispute opened
          content:
            application/json:
              schema:
                type: object
                properties:
                  dispute_id:
                    type: string
                  escrow_id:
                    type: string
                  status:
                    type: string
                    example: open
                  opened_at:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/escrow/status:
    get:
      operationId: getEscrowStatus
      summary: Escrow status
      description: Check the status of an escrow. Costs $0.008/call.
      tags:
      - Escrow
      parameters:
      - name: escrow_id
        in: query
        required: true
        schema:
          type: string
        description: Escrow identifier
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Escrow status
          content:
            application/json:
              schema:
                type: object
                properties:
                  escrow_id:
                    type: string
                  status:
                    type: string
                    enum:
                    - pending
                    - released
                    - disputed
                    - refunded
                  amount:
                    type: number
                  currency:
                    type: string
                  created_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