> ## 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. # Get the deliverability health trend and forecast for a number > Per-DID predictive deliverability trajectory: a per-period score series, trend direction and slope, a linear forecast at a configurable horizon, and a step-change anomaly flag (read-only, live bucketed scan over locally-stored message rows). Periods below the sample-size floor return `score: null`, `tier: "unknown"` and are excluded from the trend fit. Distinct from /api/v1/numbers/{id}/health, which serves the daily point-in-time snapshot. ## OpenAPI ````yaml /openapi.yaml get /api/v1/numbers/{id}/health/trend 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 - name: Risk description: >- Unified cross-channel Trust & Fraud risk scoring — fuses SMS-pumping, URL-reputation, Verify Fraud Guard, and Voice Biometrics signals into one composite verdict queryable before a send or a call. - name: Orby description: >- In-dashboard Orby operator assistant: streamed assistant turns, conversation threads, product knowledge-base search, and the tool-action approval gate. Available to signed-in operators only (dashboard session auth — API-key requests are rejected). paths: /api/v1/numbers/{id}/health/trend: get: tags: - Numbers summary: Get the deliverability health trend and forecast for a number description: >- Per-DID predictive deliverability trajectory: a per-period score series, trend direction and slope, a linear forecast at a configurable horizon, and a step-change anomaly flag (read-only, live bucketed scan over locally-stored message rows). Periods below the sample-size floor return `score: null`, `tier: "unknown"` and are excluded from the trend fit. Distinct from /api/v1/numbers/{id}/health, which serves the daily point-in-time snapshot. parameters: - schema: type: string in: path name: id required: true - schema: type: string enum: - 30d - 60d - 90d default: 90d in: query name: window description: Lookback window - schema: type: string enum: - day - week default: week in: query name: bucket description: Period granularity of the score series - schema: type: integer minimum: 1 maximum: 60 default: 14 in: query name: horizon_days description: Forecast horizon in days responses: '200': description: Trend series, direction, forecast and anomaly for the number content: application/json: schema: type: object properties: data: type: object properties: phone_number_id: type: string phone_number: type: string window: type: string enum: - 30d - 60d - 90d bucket: type: string enum: - day - week window_start: type: string format: date-time window_end: type: string format: date-time lookback_days: type: integer min_sample_size: type: integer points: type: array items: type: object properties: period_start: type: string format: date-time period_end: type: string format: date-time score: type: number nullable: true tier: type: string description: >- excellent | good | fair | poor | critical | unknown sample_size: type: integer scored_periods: type: integer direction: type: string description: improving | declining | stable | insufficient_data slope_per_day: type: number nullable: true forecast: type: object nullable: true properties: horizon_days: type: integer projected_score: type: number projected_tier: type: string slope_per_day: type: number anomaly: type: object properties: detected: type: boolean latest_score: type: number nullable: true baseline_mean: type: number nullable: true deviation: type: number nullable: true meta: $ref: '#/components/schemas/ResponseMeta' components: schemas: ResponseMeta: type: object required: - request_id - timestamp additionalProperties: false properties: request_id: type: string description: Unique request identifier (also returned as X-Request-Id header) timestamp: type: string format: date-time docs_url: type: string format: uri nullable: true 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_*) ````