openapi: 3.2.0
info:
  title: AAAA Nexus Identity 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: Identity
  description: Agent identity registration, lookup, revocation, and challenges
paths:
  /v1/identity/verify:
    post:
      operationId: verifyIdentity
      summary: Topological identity verification
      description: Verify agent identity in untrusted networks with Sybil-resistance and a formally proved depth limit. Costs $0.020/call.
      tags:
      - Identity
      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: Identity verification result
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  verified:
                    type: boolean
                  sybil_resistant:
                    type: boolean
                  depth_limit_proved:
                    type: boolean
                  timestamp:
                    type: string
                    format: date-time
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/identity/register:
    post:
      operationId: registerIdentity
      summary: Register agent identity
      description: Register a new agent identity in the identity registry.
      tags:
      - Identity
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - agent_id
              properties:
                agent_id:
                  type: string
                public_key:
                  type: string
                metadata:
                  type: object
      responses:
        '200':
          description: Identity registered
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  registered_at:
                    type: string
                    format: date-time
                  identity_hash:
                    type: string
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/identity/lookup:
    get:
      operationId: lookupIdentity
      summary: Lookup registered identity
      description: Look up a registered identity by agent ID.
      tags:
      - Identity
      parameters:
      - name: agent_id
        in: query
        required: true
        schema:
          type: string
        description: Agent identifier
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      responses:
        '200':
          description: Identity details
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  public_key:
                    type: string
                  registered_at:
                    type: string
                    format: date-time
                  status:
                    type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/identity/revoke:
    post:
      operationId: revokeIdentity
      summary: Revoke agent identity
      description: Revoke a registered agent identity.
      tags:
      - Identity
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - agent_id
              properties:
                agent_id:
                  type: string
      responses:
        '200':
          description: Identity revoked
          content:
            application/json:
              schema:
                type: object
                properties:
                  agent_id:
                    type: string
                  revoked_at:
                    type: string
                    format: date-time
                  status:
                    type: string
                    example: revoked
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
  /v1/identity/challenge:
    post:
      operationId: challengeIdentity
      summary: Issue identity challenge
      description: Issue a cryptographic challenge to verify an agent's identity.
      tags:
      - Identity
      security:
      - ApiKeyAuth: []
      - X402PaymentProof: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - agent_id
              properties:
                agent_id:
                  type: string
      responses:
        '200':
          description: Challenge issued
          content:
            application/json:
              schema:
                type: object
                properties:
                  challenge_id:
                    type: string
                  nonce:
                    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/identity/sybil-check:
    get:
      operationId: sybilCheck
      summary: Sybil-resistance check
      description: Sybil-resistance check on the calling IP address. Free endpoint.
      tags:
      - Identity
      responses:
        '200':
          description: Sybil check result
          content:
            application/json:
              schema:
                type: object
                properties:
                  ip:
                    type: string
                  sybil_score:
                    type: number
                    format: float
                  suspicious:
                    type: boolean
                  timestamp:
                    type: string
                    format: date-time
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