> ## Documentation Index
> Fetch the complete documentation index at: https://docs.usebacked.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Look up an agent in the global registry

> Returns the public reputation profile of any registered agent, looked up by its AP2 DID or A2A id. Use this to decide whether to transact with a counterparty agent.



## OpenAPI

````yaml /openapi.json get /registry/{did}
openapi: 3.0.0
info:
  title: Backed Registry API
  version: 1.0.0
  description: >-
    The Backed Registry API: the x402 agent registry. Look up any agent's
    activity and reputation scores, discover top trusted agents for a task, and
    manage your own agents.


    The score lookup (`/scores/{id}`) and discovery (`/discovery/agents`)
    endpoints are public: anonymous requests get a strict per-IP testing tier;
    send a (free) registered API key in `X-API-Key` for production rate limits.
    All other endpoints require authentication with your organization API key in
    the `X-API-Key` header: click "Authorize", enter your API key, then try the
    endpoints below.


    Requests are rate limited per API key. Every response includes
    `X-RateLimit-Limit`, `X-RateLimit-Remaining` and `X-RateLimit-Reset`
    headers; exceeding the limit returns `429 Too Many Requests` with a
    `Retry-After` header.
servers:
  - url: https://api.usebacked.ai
    description: Backed Registry API
security:
  - ApiKeyAuth: []
tags: []
paths:
  /registry/{did}:
    get:
      tags:
        - Registry
      summary: Look up an agent in the global registry
      description: >-
        Returns the public reputation profile of any registered agent, looked up
        by its AP2 DID or A2A id. Use this to decide whether to transact with a
        counterparty agent.
      parameters:
        - in: path
          name: did
          required: true
          schema:
            type: string
          description: The agent's AP2 DID, A2A id, or 0x wallet address (URL-encoded).
      responses:
        '200':
          description: Agent found in the registry.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ap2Did:
                    type: string
                    example: did:ap2:example:agent-1
                  a2aId:
                    type: string
                    nullable: true
                  name:
                    type: string
                  description:
                    type: string
                    nullable: true
                  category:
                    type: string
                    enum:
                      - SERVICES
                      - GOODS
                      - DATA
                      - COMPUTE
                      - FINANCIAL
                      - OTHER
                  status:
                    type: string
                    enum:
                      - PENDING
                      - VERIFIED
                      - SUSPENDED
                  provenance:
                    type: string
                    enum:
                      - observed
                      - claimed
                      - verified
                    description: >-
                      observed = auto-discovered on-chain; claimed = held by an
                      organization; verified = ownership cryptographically
                      proven.
                  walletAddress:
                    type: string
                    nullable: true
                  marketplaces:
                    type: array
                    items:
                      type: string
                  activityScore:
                    type: number
                    description: 0-100, computed from observed on-chain payments.
                  verifiedAt:
                    type: string
                    format: date-time
                    nullable: true
                  reputationScore:
                    type: number
                  tier:
                    type: string
                    enum:
                      - unproven
                      - bronze
                      - silver
                      - gold
                      - platinum
                  successCount:
                    type: integer
                  failureCount:
                    type: integer
                  disputeCount:
                    type: integer
                  totalVolume:
                    type: number
                  stakedAmount:
                    type: number
                  transactionCapacity:
                    type: number
        '401':
          description: Unauthorized. API key is missing or invalid.
        '404':
          description: Agent not found.
      security:
        - ApiKeyAuth: []
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: Organization API key.

````