LinqAlpha MCP API

openapi: 3.0.1
info:
  title: LinqAlpha Briefing MCP API
  description: Linq helps finance professionals make informed decisions using Retrieval-Augmented Generation (RAG)-enhanced answers. By leveraging cutting-edge Large Language Models (LLM) and supplementary technology, Linq provides the most optimized responses based on your queries.
  version: 1.0.0
  license:
    name: MIT
servers:
- url: https://api.linqalpha.com
security:
- ApiKeyAuth: []
tags:
- name: MCP
  description: LinqAlpha MCP — Financial data tools for AI assistants via Model Context Protocol
paths:
  /v1/mcp:
    post:
      summary: LinqAlpha MCP
      description: "LinqAlpha MCP gives AI assistants direct access to institutional-grade financial data for fundamental research. Through the Model Context Protocol (MCP), your AI can query company fundamentals, earnings estimates, stock prices, economic indicators, SEC filings, and earnings transcripts — all from a single endpoint.\n\nSupports JSON-RPC 2.0 protocol.\n\nAvailable methods:\n- `initialize` — Initialize MCP session\n- `ping` — Health check\n- `tools/list` — List available financial data tools\n- `tools/call` — Execute a financial data tool\n\n**Setup (Claude Desktop):**\n```json\n{\n  \"mcpServers\": {\n    \"linqalpha\": {\n      \"url\": \"https://api.linqalpha.com/v1/mcp\",\n      \"headers\": { \"x-api-key\": \"<your-api-key>\" }\n    }\n  }\n}\n```"
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/McpJsonRpcRequest'
      responses:
        '200':
          description: JSON-RPC 2.0 response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/McpJsonRpcResponse'
        '400':
          description: Invalid JSON-RPC request
        '401':
          description: Authentication failed
      tags:
      - MCP
components:
  schemas:
    McpJsonRpcResponse:
      type: object
      properties:
        jsonrpc:
          type: string
          enum:
          - '2.0'
        id:
          type: integer
          nullable: true
          description: Request identifier (null for error responses)
        result:
          type: object
          description: Method result (present on success)
        error:
          type: object
          properties:
            code:
              type: integer
              description: JSON-RPC error code
            message:
              type: string
              description: Error message
          description: Error object (present on failure)
    McpJsonRpcRequest:
      type: object
      required:
      - jsonrpc
      - method
      properties:
        jsonrpc:
          type: string
          enum:
          - '2.0'
          description: JSON-RPC version
        method:
          type: string
          enum:
          - initialize
          - ping
          - notifications/initialized
          - tools/list
          - tools/call
          description: MCP method to invoke
        id:
          type: integer
          description: Request identifier
        params:
          type: object
          description: 'Method-specific parameters. For tools/call: { name: string, arguments: object }'
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-KEY