> ## Documentation Index > Fetch the complete documentation index at: https://docs.orbit.devotel.io/llms.txt > Use this file to discover all available pages before exploring further. # Materialize a lookalike preview into a static segment > Promote an AI lookalike PREVIEW into a persisted, static contact segment ready for one-click audience activation. Runs the same centroid-k-NN scoring as `/expand` (so the materialized set equals the preview), then persists the net-new candidates as a NEW static segment (no rules/filters, auto_refresh=false) whose `segment_id` feeds the CDP audience-activation surface. Returns 201 with `materialized: true` and the new segment; when the preview yields no candidates it returns 200 with `materialized: false` and a `reason`, persisting nothing. ## OpenAPI ````yaml /openapi.yaml post /api/v1/contacts/segments/{id}/materialize-lookalike openapi: 3.1.0 info: title: Devotel CPaaS API description: Orbit by Devotel — Communications Platform as a Service API version: 1.0.0 contact: name: Devotel url: https://devotel.io email: support@devotel.io license: name: Proprietary servers: - url: https://api.orbit.devotel.io description: Production security: - Bearer: [] - ApiKey: [] tags: - name: Messages description: >- Send and manage messages across all channels (SMS, WhatsApp, RCS, Email, Viber, etc.) - name: Fax description: >- List and track fax (MMS/T.38) transmissions on Telnyx-backed fax numbers (sending flows through the Messaging API) - name: Agents description: AI agent creation, configuration, and execution - name: Voice description: Voice calls, IVR, conferencing, and SIP trunking - name: OnCall description: On-call rotations and escalation policy planning for incident alerting - name: Webhooks description: Webhook endpoint management and delivery logs - name: Numbers description: Phone number search, provisioning, and configuration - name: Brand Identity description: >- Unified cross-channel brand trust posture (10DLC, toll-free, WhatsApp, RCS, branded calling, number KYC) - name: Contacts description: Contact management, segmentation, and lifecycle tracking - name: Campaigns description: Marketing campaign orchestration and analytics - name: Flows description: Automation flow builder and execution engine - name: Templates description: Message template management and approval workflows - name: Settings description: Organization, channel, and user preference settings - name: Verify description: OTP generation and verification across channels - name: Push description: Push notification delivery via FCM and APNs - name: Integrations description: Third-party service connections and OAuth management - name: CDP description: >- Customer Data Platform — activation surface (CRM object sync, streaming destinations, ad-audience activation) - name: Files description: >- Server-to-server media upload, listing, retrieval, and deletion (signed-URL backed) - name: Commerce description: >- Omnichannel conversational-commerce — persistent cart + checkout state machine, channel-agnostic hosted pay-by-link, native WhatsApp checkout, and AP2-style agent payment mandates. - name: Sync description: >- Real-time shared-state primitive (Twilio Sync parity) — Documents, Maps, Lists, and ephemeral Streams, with change events relayed over the /api/v1/ws/sync WebSocket gateway paths: /api/v1/contacts/segments/{id}/materialize-lookalike: post: tags: - Contacts summary: Materialize a lookalike preview into a static segment description: >- Promote an AI lookalike PREVIEW into a persisted, static contact segment ready for one-click audience activation. Runs the same centroid-k-NN scoring as `/expand` (so the materialized set equals the preview), then persists the net-new candidates as a NEW static segment (no rules/filters, auto_refresh=false) whose `segment_id` feeds the CDP audience-activation surface. Returns 201 with `materialized: true` and the new segment; when the preview yields no candidates it returns 200 with `materialized: false` and a `reason`, persisting nothing. parameters: - schema: type: string in: path name: id required: true requestBody: content: application/json: schema: type: object properties: limit: type: integer minimum: 1 maximum: 500 default: 100 description: >- Number of net-new lookalike contacts to materialize (matches the `/expand` preview cap so preview equals the materialized set). sample_size: type: integer minimum: 1 maximum: 200 default: 50 description: Seed members sampled for the centroid (see `/expand`). name: type: string minLength: 1 maxLength: 200 description: >- Optional override for the new segment's name; defaults to "Lookalike of ". responses: '200': description: The preview yielded no candidates; nothing was persisted. content: application/json: schema: type: object properties: data: type: object properties: materialized: type: boolean enum: - false seed_segment_id: type: string seed_count: type: integer candidate_count: type: integer reason: type: string description: >- Actionable reason the lookalike could not be materialized (e.g. empty seed, embeddings unavailable, or no lookalikes found). meta: type: object properties: request_id: type: string timestamp: type: string format: date-time '201': description: A new static lookalike segment was materialized. content: application/json: schema: type: object properties: data: type: object properties: materialized: type: boolean enum: - true seed_segment_id: type: string segment: type: object additionalProperties: true description: The newly created static segment record. member_count: type: integer activation_ready: type: boolean meta: type: object properties: request_id: type: string timestamp: type: string format: date-time components: securitySchemes: Bearer: type: http scheme: bearer bearerFormat: JWT description: Dashboard JWT token from Clerk ApiKey: type: apiKey name: X-API-Key in: header description: Server-to-server API key (dv_live_sk_*) ````