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

# List Trace Users

> List unique user_ids with trace statistics.

Auth: `Bearer` + `X-Project-ID` | `X-API-Key` + `X-Project-Name`



## OpenAPI

````yaml /openapi.json get /traces/users
openapi: 3.1.0
info:
  title: PandaProbe API
  description: >-
    Open-source agent engineering platform — trace LLM calls, evaluate agent
    performance, and monitor AI pipelines.
  version: 0.1.0
  contact:
    name: PandaProbe
    url: https://www.pandaprobe.com
    email: support@pandaprobe.com
servers:
  - url: https://api.pandaprobe.com
    description: Production
security: []
tags:
  - name: health
    description: Service health and readiness probes.
  - name: user
    description: Authenticated user profile.
  - name: traces
    description: Trace ingestion, querying, updating, and analytics.
  - name: sessions
    description: Session-based trace aggregation and analytics.
  - name: evaluations
    description: Evaluation runs, scores, analytics, and monitoring.
  - name: organizations
    description: Organization management and membership.
  - name: projects
    description: Project CRUD within organizations.
  - name: api-keys
    description: API key lifecycle management.
paths:
  /traces/users:
    get:
      tags:
        - traces
      summary: List Trace Users
      description: |-
        List unique user_ids with trace statistics.

        Auth: `Bearer` + `X-Project-ID` | `X-API-Key` + `X-Project-Name`
      operationId: list_trace_users_traces_users_get
      parameters:
        - name: limit
          in: query
          required: false
          schema:
            type: integer
            maximum: 200
            minimum: 1
            default: 50
            title: Limit
        - name: offset
          in: query
          required: false
          schema:
            type: integer
            minimum: 0
            default: 0
            title: Offset
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedResponse_UserSummary_'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      security:
        - HTTPBearer: []
        - ApiKey: []
        - ProjectID: []
        - ProjectName: []
components:
  schemas:
    PaginatedResponse_UserSummary_:
      properties:
        items:
          items:
            $ref: '#/components/schemas/UserSummary'
          type: array
          title: Items
        total:
          type: integer
          title: Total
        limit:
          type: integer
          title: Limit
        offset:
          type: integer
          title: Offset
      type: object
      required:
        - items
        - total
        - limit
        - offset
      title: PaginatedResponse[UserSummary]
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    UserSummary:
      properties:
        user_id:
          type: string
          title: User Id
        trace_count:
          type: integer
          title: Trace Count
        first_seen:
          type: string
          title: First Seen
        last_seen:
          type: string
          title: Last Seen
        error_count:
          type: integer
          title: Error Count
      type: object
      required:
        - user_id
        - trace_count
        - first_seen
        - last_seen
        - error_count
      title: UserSummary
      description: Aggregated trace statistics for a single end-user.
    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
  securitySchemes:
    HTTPBearer:
      type: http
      scheme: bearer
    ApiKey:
      type: apiKey
      in: header
      name: X-API-Key
    ProjectID:
      type: apiKey
      in: header
      name: X-Project-ID
    ProjectName:
      type: apiKey
      in: header
      name: X-Project-Name

````