> ## Documentation Index > Fetch the complete documentation index at: https://docs.talqui.chat/llms.txt > Use this file to discover all available pages before exploring further. # Count contacts segment > Counts contacts matching the given filter rules and channel, applying the mandatory contactBlock/contactExternal[channel] reachability gates regardless of what the client's filters request. Used by the campaign wizard's recipients step to show a live audience count as the operator builds a segment. ## OpenAPI ````yaml /api/services-api.yaml post /v1/tenants/{tenantID}/contacts/segment/count openapi: 3.0.3 info: description: >- Talqui is an omnichannel customer service platform that unifies conversations from WhatsApp, Instagram, Telegram, and many other channels into a single attendant panel, alongside a broader ecosystem of plugins and integrations. This API gives developers programmatic access to Talqui's services layer, exposing the operations needed to read and manage tenants, conversations, plugins, and related resources that power that platform. Authentication is available on behalf of an Operator (the default for this API), a Plugin Connection, or a Plugin — see the [Talqui authentication guide](https://docs.talqui.chat/guides/introduction/authentication/) for how each token is obtained and when to use it. Need help or have questions not covered here? Reach out to support@talqui.com. license: name: ISC url: https://opensource.org/license/isc-license-txt title: Talqui - Services API version: 0.65.0 servers: - description: Production url: https://services-api.talqui.chat security: [] tags: - name: Tenants - name: Settings - name: Analytics - name: Campaigns - name: Campaigns models - name: Contacts - name: Handoff links - name: Inboxes - name: Messages - name: Notifications - name: Sessions - name: Operators - name: Plugins - name: Setup - name: Uploads paths: /v1/tenants/{tenantID}/contacts/segment/count: post: tags: - Contacts summary: Count contacts segment description: |- Counts contacts matching the given filter rules and channel, applying the mandatory contactBlock/contactExternal[channel] reachability gates regardless of what the client's filters request. Used by the campaign wizard's recipients step to show a live audience count as the operator builds a segment. operationId: CountContactsSegmentController parameters: - in: path name: tenantID required: true schema: type: string requestBody: content: application/json: schema: properties: channel: description: The campaign channel URN to check reachability against. type: string filters: default: [] description: >- AND-combined filter rules — see ContactSegmentFilter for the wire format. items: properties: criterion: description: >- The field/criterion name — see the engine for the recognized set. type: string id: description: >- Client-generated identifier for this rule; echoed back, never used for logic. type: string operator: description: One of the CONTACT_SEGMENT_CONDITIONALS values. enum: - eq - ne - ex - nex - ha - nh - gt - lt - gte - lte - sw - ew type: string query: default: [] description: >- Operand values for this rule — usually a single-element array. items: {} type: array schema: description: >- Whether this criterion is native to Contact ("contact") or requires a join ("interaction"). enum: - contact - interaction type: string required: - id - schema - criterion - operator type: object type: array required: - channel type: object required: true responses: '200': content: application/json: schema: additionalProperties: false properties: totalCount: description: Number of contacts matching the given filters and channel. type: number required: - totalCount type: object description: Response for status 200. '400': content: application/json: schema: properties: errors: items: oneOf: - $ref: '#/components/schemas/MissingTenantIDError' - $ref: '#/components/schemas/InvalidChannelError' - $ref: '#/components/schemas/RequestValidationError' maxItems: 1 minItems: 1 type: array required: - errors type: object description: >- MissingTenantIDError (error_code 1001): tenantID absent from the URL. | InvalidChannelError (error_code 1700): channel missing or not a valid campaign channel. | RequestValidationError (error_code 1002): request body fails schema validation. '401': content: application/json: schema: properties: errors: items: $ref: '#/components/schemas/UnauthorizedError' maxItems: 1 minItems: 1 type: array required: - errors type: object description: 'UnauthorizedError (error_code 1003): missing/invalid operator token.' '403': content: application/json: schema: properties: errors: items: $ref: '#/components/schemas/ForbiddenError' maxItems: 1 minItems: 1 type: array required: - errors type: object description: 'ForbiddenError (error_code 1004): operator token rejected upstream.' '500': content: application/json: schema: properties: errors: items: $ref: '#/components/schemas/UnknownError' maxItems: 1 minItems: 1 type: array required: - errors type: object description: >- UnknownError (error_code 5999): Unexpected internal error not otherwise documented for this endpoint. security: - operatorAuth: [] components: schemas: MissingTenantIDError: additionalProperties: false properties: error: enum: - MissingTenantIDError type: string error_code: enum: - 1001 type: number message: example: tenantID is required. type: string statusCode: enum: - 400 type: number required: - statusCode - error - error_code - message type: object InvalidChannelError: additionalProperties: false properties: error: enum: - InvalidChannelError type: string error_code: enum: - 1700 type: number message: example: channel is required and must be a valid campaign channel URN. type: string statusCode: enum: - 400 type: number required: - statusCode - error - error_code - message type: object RequestValidationError: additionalProperties: false properties: error: enum: - RequestValidationError type: string error_code: enum: - 1002 type: number fields: items: additionalProperties: false properties: allowed: type: string field: type: string received: type: string required: - field - received - allowed type: object type: array message: example: Invalid request data. type: string statusCode: enum: - 400 type: number required: - statusCode - error - error_code - message - fields type: object UnauthorizedError: additionalProperties: false properties: error: enum: - UnauthorizedError type: string error_code: enum: - 1003 type: number message: example: You are not authorized to perform this request. type: string statusCode: enum: - 401 type: number required: - statusCode - error - error_code - message type: object ForbiddenError: additionalProperties: false properties: error: enum: - ForbiddenError type: string error_code: enum: - 1004 type: number message: example: You do not have access to this resource. type: string statusCode: enum: - 403 type: number required: - statusCode - error - error_code - message type: object UnknownError: additionalProperties: false properties: error: enum: - UnknownError type: string error_code: enum: - 5999 type: number message: example: For some unknown reason your request has not succeeded. type: string statusCode: enum: - 500 type: number required: - statusCode - error - error_code - message type: object securitySchemes: operatorAuth: bearerFormat: JWT description: >- Behalf of an Operator (default). A JWT issued by Talqui Core when an operator signs in, scoped to every tenant that operator belongs to. Send as `Authorization: Bearer `. scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.