> ## 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. # Send an ad-hoc broadcast to selected contacts > Create and launch an ad-hoc campaign targeting a selected audience on a single channel. Target the audience with either an explicit `contact_ids` array or a `filters` AST — provide exactly one. Reuses the campaign pipeline so opt-outs, billing, throttling and delivery tracking all apply. Provide `scheduled_at` to schedule instead of sending immediately; large selections are queued. ## OpenAPI ````yaml /openapi.yaml post /api/v1/contacts/bulk/send 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/contacts/bulk/send: post: tags: - Contacts summary: Send an ad-hoc broadcast to selected contacts description: >- Create and launch an ad-hoc campaign targeting a selected audience on a single channel. Target the audience with either an explicit `contact_ids` array or a `filters` AST — provide exactly one. Reuses the campaign pipeline so opt-outs, billing, throttling and delivery tracking all apply. Provide `scheduled_at` to schedule instead of sending immediately; large selections are queued. requestBody: required: true content: application/json: schema: type: object properties: contact_ids: type: array items: type: string description: >- Explicit contact ids to message (max 50,000). Provide this OR `filters`. filters: type: object additionalProperties: true description: >- Segment filter AST resolving the audience server-side. Provide this OR `contact_ids`. name: type: string maxLength: 200 description: A label for the ad-hoc campaign this broadcast creates. channel: type: string enum: - sms - whatsapp - rcs - viber - email - messenger - instagram - voice description: The delivery channel for the broadcast. message_template: type: string maxLength: 4096 description: >- The message body, with optional personalization placeholders. subject: type: string maxLength: 500 description: Subject line, used for the email channel. scheduled_at: type: string format: date-time description: ISO 8601 time to send at. Omit to send immediately. required: - name - channel - message_template example: contact_ids: - contact_01HZX8Y7QJK4M name: February VIP offer channel: sms message_template: Hi {{first_name}}, enjoy 20% off this week! responses: '201': description: Broadcast created and launched inline. content: application/json: schema: type: object properties: data: type: object properties: queued: type: boolean campaign_id: type: string total: type: integer meta: type: object properties: request_id: type: string timestamp: type: string format: date-time example: data: queued: false campaign_id: camp_01HZX9SEND total: 1 meta: request_id: req_01HZX9ABCDEF timestamp: '2026-02-02T12:00:00.000Z' '202': description: >- Large selection accepted and queued; poll the returned job id for progress. content: application/json: schema: type: object properties: data: type: object properties: queued: type: boolean job_id: type: string total: type: integer meta: type: object properties: request_id: type: string timestamp: type: string format: date-time example: data: queued: true job_id: bulkop_01HZX9QJK4M total: 20000 meta: request_id: req_01HZX9ABCDEF timestamp: '2026-02-02T12:00:00.000Z' 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_*) ````