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

# List traces

> Returns traces for a project.



## OpenAPI

````yaml https://api.uselemma.ai/openapi.json get /traces
openapi: 3.1.0
info:
  title: Lemma Platform API
  description: Lemma Platform HTTP API for AI observability and workspace operations.
  version: 0.1.0
servers:
  - url: https://api.uselemma.ai
    description: Lemma production API
security:
  - bearerAuth: []
paths:
  /traces:
    get:
      tags:
        - Traces
      summary: List traces
      description: Returns traces for a project.
      operationId: list_traces
      parameters:
        - name: project_id
          in: query
          required: true
          description: Project ID.
          schema:
            type: string
        - name: environment
          in: query
          required: false
          description: Environment filter.
          schema:
            type: string
        - name: start
          in: query
          required: false
          description: Start timestamp.
          schema:
            type: string
        - name: end
          in: query
          required: false
          description: End timestamp.
          schema:
            type: string
        - name: limit
          in: query
          required: false
          description: Maximum number of records to return.
          schema:
            type: integer
            minimum: 1
        - name: error_only
          in: query
          required: false
          description: Only return traces with errors.
          schema:
            type: boolean
      responses:
        '200':
          description: Traces list
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
                  properties:
                    id:
                      type: string
                    otel_trace_id:
                      type: string
                    project_id:
                      type: string
                    project_name:
                      type: string
                    service_name:
                      type:
                        - string
                        - 'null'
                    created_at:
                      type: string
                      format: date-time
                  required:
                    - id
                    - otel_trace_id
                    - project_id
                    - service_name
                    - created_at
                  additionalProperties: true
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
                required:
                  - detail
                additionalProperties: false
        '404':
          description: Not found
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
                required:
                  - detail
                additionalProperties: false
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer

````