openapi: 3.2.0
info:
  title: A2A Autonomous Trader Agent X402 API
  version: 0.1.0
tags:
- name: X402
paths:
  /x402/{skill}:
    post:
      summary: X402 Pay Per Call
      description: 'HTTP x402 gate: Challenge → Sign → Retry → Settle for contractor skills.


        Without PAYMENT-SIGNATURE → 402 + PAYMENT-REQUIRED.

        With valid signature → settle, create A2A task (marked paid), return receipt + artifact.'
      operationId: x402_pay_per_call_x402__skill__post
      parameters:
      - name: skill
        in: path
        required: true
        schema:
          type: string
          title: Skill
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                title: Response X402 Pay Per Call X402  Skill  Post
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      tags:
      - X402
components:
  schemas:
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
            - type: string
            - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
      - loc
      - msg
      - type
      title: ValidationError