> ## Documentation Index > Fetch the complete documentation index at: https://docs.avidoai.com/llms.txt > Use this file to discover all available pages before exploring further. # List Trace Sessions > Retrieve traces grouped by referenceId with aggregated metrics. ## OpenAPI ````yaml https://app.stainless.com/api/spec/documented/avido/openapi.documented.yml get /v0/traces/sessions openapi: 3.1.1 info: title: Avido API description: >- Avido's API for LLM usage events, tool calls, trace management, webhook validation, and more. See each endpoint's request/response schema for details. version: 0.1.0 contact: name: Avido Support email: support@avidoai.com url: https://avidoai.com/support servers: - url: https://api.avidoai.com description: Production API security: - ApiKey: [] ApplicationId: [] paths: /v0/traces/sessions: get: tags: - Traces summary: List Trace Sessions description: Retrieve traces grouped by referenceId with aggregated metrics. operationId: listTraceSessions parameters: - in: query name: skip schema: description: Number of items to skip before starting to collect the result set. example: 0 default: 0 type: integer minimum: 0 maximum: 9007199254740991 description: Number of items to skip before starting to collect the result set. - in: query name: limit schema: description: Number of items to include in the result set. example: 25 type: integer minimum: 1 maximum: 100 description: Number of items to include in the result set. responses: '200': description: Successfully retrieved trace sessions content: application/json: schema: $ref: '#/components/schemas/PaginatedTraceSessionResponse' '400': description: bad request content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: forbidden content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '422': description: invalid input content: application/json: schema: $ref: '#/components/schemas/ValidationErrorResponse' '500': description: internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: schemas: PaginatedTraceSessionResponse: type: object properties: data: type: array items: $ref: '#/components/schemas/TraceSessionOutput' pagination: type: object properties: skip: type: integer minimum: 0 maximum: 9007199254740991 description: Number of items skipped. example: 0 limit: type: integer minimum: 1 maximum: 9007199254740991 description: Number of items per page. example: 25 total: type: integer minimum: 0 maximum: 9007199254740991 description: Total number of items available. example: 100 totalPages: type: integer minimum: 0 maximum: 9007199254740991 description: Total number of pages available. example: 4 totalCount: description: >- Total number of items without filters applied. Used to distinguish between truly empty results and empty filtered results. example: 100 type: integer minimum: 0 maximum: 9007199254740991 required: - skip - limit - total - totalPages additionalProperties: false title: PaginationResponse description: Pagination metadata returned in a paginated response. required: - data - pagination additionalProperties: false title: Paginated Trace Sessions description: Paginated response containing trace sessions ErrorResponse: type: object properties: message: type: string description: A human-readable error message explaining the error. example: Resource not found required: - message additionalProperties: false title: ErrorResponse description: Standard error format for failed API operations. ValidationErrorResponse: type: object properties: message: type: string description: A human-readable error message indicating what went wrong. example: Invalid request data issues: type: array items: type: object properties: code: type: string message: type: string path: type: array items: type: string required: - code - message - path additionalProperties: false description: Array of detailed validation error objects. example: - code: invalid_string message: Invalid UUID path: - id required: - message - issues additionalProperties: false title: ValidationErrorResponse description: Details about validation errors in incoming requests. TraceSessionOutput: type: object properties: referenceId: type: string description: The reference identifier grouping multiple traces. example: ref-abc-123 traceCount: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Number of traces in this session. example: 5 firstSeen: description: Timestamp of the earliest trace in this session. example: '2025-01-05T12:00:00.000Z' type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ lastSeen: description: Timestamp of the latest trace in this session. example: '2025-01-05T12:34:56.789Z' type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ totalCost: anyOf: - type: number - type: 'null' description: Total cost across all traces in this session. example: 0.05 totalPromptTokens: anyOf: - type: integer minimum: -9007199254740991 maximum: 9007199254740991 - type: 'null' description: Total prompt tokens across all traces in this session. example: 500 totalCompletionTokens: anyOf: - type: integer minimum: -9007199254740991 maximum: 9007199254740991 - type: 'null' description: Total completion tokens across all traces in this session. example: 300 hasError: type: boolean description: Whether any trace in this session has an error. example: false required: - referenceId - traceCount - firstSeen - lastSeen - totalCost - totalPromptTokens - totalCompletionTokens - hasError additionalProperties: false title: TraceSession description: A grouped view of traces sharing the same reference identifier. securitySchemes: ApiKey: type: apiKey in: header name: x-api-key description: Your unique Avido API key ApplicationId: type: apiKey in: header name: x-application-id description: Your unique Avido Application ID ````