> ## 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.

# Find similar legal sources

> Find cases and documents similar to a given legal source. Useful for finding citing cases, related precedents, or similar statutes.



## OpenAPI

````yaml /openapi.json post /legal/v1/similar
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:
  /legal/v1/similar:
    post:
      tags:
        - Legal
      summary: Find similar legal sources
      description: >-
        Find cases and documents similar to a given legal source. Useful for
        finding citing cases, related precedents, or similar statutes.
      operationId: legalFindSimilar
      requestBody:
        description: Source URL and filtering options
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - url
              properties:
                url:
                  type: string
                  format: uri
                  description: URL of a legal document to find similar sources for
                jurisdiction:
                  type: string
                  description: Optional jurisdiction ID to filter results
                numResults:
                  type: integer
                  description: 'Number of results 1-25 (default: 10)'
                  minimum: 1
                  maximum: 25
                  default: 10
                startPublishedDate:
                  type: string
                  format: date
                  description: >-
                    Optional ISO date to find only newer documents (e.g.,
                    "2020-01-01")
      responses:
        '200':
          description: Similar sources found successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  sourceUrl:
                    type: string
                    description: Original source URL
                  jurisdiction:
                    type: string
                    description: Jurisdiction filter applied
                  found:
                    type: integer
                    description: Number of similar sources found
                  similarSources:
                    type: array
                    items:
                      type: object
                      properties:
                        url:
                          type: string
                          description: URL of the similar source
                        title:
                          type: string
                          description: Title of the document
                        snippet:
                          type: string
                          description: Text excerpt from the document
                        publishedDate:
                          type: string
                          description: Publication date
                          nullable: true
                        source:
                          type: string
                          description: Domain of the source
                  hint:
                    type: string
                    description: Usage guidance
        '400':
          description: Bad request - invalid URL or parameters
        '401':
          description: Unauthorized - invalid API key
        '403':
          description: Forbidden - insufficient permissions
        '503':
          description: Service unavailable - similarity service unreachable
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key
      description: API key starting with `sk_case_`

````