> ## Documentation Index > Fetch the complete documentation index at: https://docs.case.dev/llms.txt > Use this file to discover all available pages before exploring further. # Get streaming transcription WebSocket URL > Returns the WebSocket URL and connection details for real-time audio transcription. The returned URL can be used to establish a WebSocket connection for streaming audio data and receiving transcribed text in real-time. **Audio Requirements:** - Sample Rate: 16kHz - Encoding: PCM 16-bit little-endian - Channels: Mono (1 channel) **Pricing:** $0.01 per minute ($0.60 per hour) ## OpenAPI ````yaml /openapi.json get /voice/streaming/url openapi: 3.1.0 info: title: Case.dev API description: >- The AI-native platform for legal technology. Build smarter legal applications with our suite of AI-powered APIs. version: 1.0.0 contact: name: Case.dev Support email: support@casemark.com url: https://case.dev license: name: Proprietary url: https://case.dev/terms servers: - url: https://api.case.dev description: Production security: - bearerAuth: [] tags: - name: Vaults description: Secure document storage with semantic search and GraphRAG - name: Memory description: >- Persistent memory for AI agents with semantic search and 12 generic indexed tag fields - name: OCR description: Extract text from PDFs, images, and scanned documents - name: Voice description: Audio transcription and text-to-speech - name: LLMs description: Access 40+ language models through a unified API - name: Search description: Web search, AI answers, and deep research - name: Mail description: Managed inboxes for agent email workflows - name: Media description: Transcript retrieval and captioned media clip generation - name: Legal description: Legal research tools including citation verification - name: Privilege description: Privilege detection for e-discovery and litigation workflows - name: Compute description: Serverless GPU and CPU infrastructure - name: Format description: Document formatting and template rendering (MD/JSON to PDF/DOCX) - name: SuperDoc description: Document conversion and template automation - name: Webhooks description: Webhook endpoint management - name: System description: Public system metadata and discovery endpoints - name: Usage description: Usage reporting and webhook subscriptions - name: Database description: Serverless PostgreSQL databases with instant branching - name: Translation description: Language detection and translation for multilingual legal workflows - name: Skills description: Search and read legal AI skills for agents - name: Agents description: >- Create, manage, and execute AI agents with tool access, sandbox environments, and async run workflows - name: Matters description: Matter-native legal workspaces and orchestration primitives - name: Applications Projects description: Web application project management - name: Applications Deployments description: Web application deployment management - name: Applications Domains description: Custom domain configuration for applications - name: Applications Env Vars description: Environment variable management for applications paths: /voice/streaming/url: get: tags: - Voice summary: Get streaming transcription WebSocket URL description: >- Returns the WebSocket URL and connection details for real-time audio transcription. The returned URL can be used to establish a WebSocket connection for streaming audio data and receiving transcribed text in real-time. **Audio Requirements:** - Sample Rate: 16kHz - Encoding: PCM 16-bit little-endian - Channels: Mono (1 channel) **Pricing:** $0.01 per minute ($0.60 per hour) operationId: getStreamingUrl responses: '200': description: WebSocket connection details returned successfully content: application/json: schema: type: object properties: url: type: string description: Base WebSocket URL for streaming transcription connect_url: type: string description: Complete WebSocket URL with authentication token protocol: type: string description: Connection protocol audio_format: type: object properties: sample_rate: type: integer description: Required audio sample rate in Hz encoding: type: string description: Required audio encoding format channels: type: integer description: Number of audio channels pricing: type: object properties: per_minute: type: number description: Cost per minute of transcription per_hour: type: number description: Cost per hour of transcription currency: type: string description: Currency for pricing example: url: >- wss://casemark-ai--websocket-stream-helper-fastapi-app.modal.run/ws connect_url: >- wss://casemark-ai--websocket-stream-helper-fastapi-app.modal.run/ws?token=cm_1234567890abcdef protocol: websocket audio_format: sample_rate: 16000 encoding: pcm_s16le channels: 1 pricing: per_minute: 0.01 per_hour: 0.6 currency: USD '401': description: Authentication failed - invalid API key '403': description: >- Insufficient permissions - API key does not have access to voice/transcription/streaming services components: securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: API Key description: API key starting with `sk_case_` ````