> ## Documentation Index > Fetch the complete documentation index at: https://docs.useboom.ai/llms.txt > Use this file to discover all available pages before exploring further. # List segments > List the organization's active segments, newest first. Archived segments are excluded. ## OpenAPI ````yaml /api-reference/openapi.json get /api/v1/segments openapi: 3.1.0 info: title: Boom API version: 1.0.0 description: >- Boom's public REST API — one uniform surface over every platform capability. CDP: upsert people and custom objects, define object and relationship types, link and unlink relationships, and record behavioral events — one record per request or up to 1000 per request via the `/batch` endpoints. Segments: read (list, read, membership) and full authoring — discover the filterable catalog, validate a filter, create and update segments, preview match counts, and trigger evaluation. Initiatives: create and configure outreach initiatives, link WhatsApp templates, drive the lifecycle (launch, cancel, archive), and read collected-data summaries. Participants: enroll people into an active initiative, track their status, read conversation transcripts, and stop outreach. Journeys: read-only access to always-on message flows and their metrics. WhatsApp templates: list your WhatsApp numbers and list, read, and create message templates. The same capabilities are exposed as MCP tools with identical schemas. servers: - url: https://www.useboom.ai description: Production - url: https://dev.useboom.ai description: Development (sandbox — use a development organization API key) security: - bearerAuth: [] paths: /api/v1/segments: get: tags: - Segments summary: List segments description: >- List the organization's active segments, newest first. Archived segments are excluded. operationId: segments_list parameters: - name: limit in: query required: false schema: $schema: https://json-schema.org/draft/2020-12/schema default: 100 description: Max items to return, 1-1000 (default 100). type: integer minimum: 1 maximum: 1000 - name: cursor in: query required: false schema: $schema: https://json-schema.org/draft/2020-12/schema description: >- Opaque pagination token from a previous response's `next_cursor`. Omit for the first page. type: string responses: '200': description: Success content: application/json: schema: $schema: https://json-schema.org/draft/2020-12/schema type: object properties: data: type: array items: type: object properties: slug: type: string description: Unique identifier within your organization. name: type: string description: anyOf: - type: string - type: 'null' evaluationCadence: type: string enum: - REACTIVE_ONLY - HOURLY - DAILY description: >- How often the segment is re-evaluated. REACTIVE_ONLY segments only change when evaluated explicitly. memberCount: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Live count of currently active members. lastEvaluatedAt: anyOf: - type: string - type: 'null' description: >- ISO 8601 timestamp; null if the segment has never evaluated. createdAt: type: string description: ISO 8601 timestamp. required: - slug - name - description - evaluationCadence - memberCount - lastEvaluatedAt - createdAt additionalProperties: false next_cursor: anyOf: - type: string - type: 'null' description: Opaque cursor for the next page; null on the last page. required: - data - next_cursor additionalProperties: false '400': description: Validation failed or the request cannot proceed. content: application/json: schema: type: object properties: error: type: object properties: code: type: string description: Stable machine-readable error code (snake_case). message: type: string required: - code - message required: - error '401': description: Missing, malformed, or revoked API key. content: application/json: schema: type: object properties: error: type: object properties: code: type: string description: Stable machine-readable error code (snake_case). message: type: string required: - code - message required: - error '404': description: The resource does not exist in this organization. content: application/json: schema: type: object properties: error: type: object properties: code: type: string description: Stable machine-readable error code (snake_case). message: type: string required: - code - message required: - error '409': description: >- Conflicts with the current state (duplicates, wrong lifecycle state). content: application/json: schema: type: object properties: error: type: object properties: code: type: string description: Stable machine-readable error code (snake_case). message: type: string required: - code - message required: - error '422': description: The request is well-formed but semantically invalid. content: application/json: schema: type: object properties: error: type: object properties: code: type: string description: Stable machine-readable error code (snake_case). message: type: string required: - code - message required: - error '429': description: Rate limit exceeded — retry after `Retry-After`. content: application/json: schema: type: object properties: error: type: object properties: code: type: string description: Stable machine-readable error code (snake_case). message: type: string required: - code - message required: - error '500': description: Internal server error. content: application/json: schema: type: object properties: error: type: object properties: code: type: string description: Stable machine-readable error code (snake_case). message: type: string required: - code - message required: - error '503': description: Transient error — retry with a narrower request. content: application/json: schema: type: object properties: error: type: object properties: code: type: string description: Stable machine-readable error code (snake_case). message: type: string required: - code - message required: - error components: securitySchemes: bearerAuth: type: http scheme: bearer description: 'Organization API key, sent as `Authorization: Bearer boom_org_...`.' ````