Callsphere

Name: Callsphere
Author: CallSphere-LLC

@CallSphere-LLC

About Callsphere

Public MCP server for voice AI — search 500+ articles, compute industry ROI, fetch case studies. Works in Claude, ChatGPT, Cursor, Cline, and any MCP-capable AI assistant.

#voice-ai #voice-agent #telephony #twilio #claude #agentic-ai #mcp #roi-calculator

Basic information

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "callsphere": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://callsphere.ai/api/mcp"
      ]
    }
  }
}

Tools

Full-text search across 500+ articles on voice AI, MCP, Claude, agentic AI, Twilio/WebRTC, and how-to guides.

Fetch the full markdown body of a single CallSphere blog post by slug.

Industry-aware ROI math: monthly savings, payback period, recommended plan tier. Returns assumptions so the AI can show its work.

Narrative case study for one of 6 verticals (dental, healthcare, HVAC, real estate, salon, law).

Canonical lookup: pricing tiers, integrations, compliance posture, supported languages, founder contact.

Overview

What is Callsphere?

Callsphere is a public, read-only Model Context Protocol (MCP) server that gives any AI assistant – including Claude, Cursor, Cline, Continue, Windsurf, Zed, or ChatGPT via JSON-RPC – direct access to CallSphere’s voice‑AI knowledge base, industry ROI calculator, case studies for six verticals, and product facts.

How to use Callsphere?

Connect to https://callsphere.ai/api/mcp using Streamable HTTP transport. Install with claude mcp add --transport http callsphere https://callsphere.ai/api/mcp (Claude Code) or add it to your client’s MCP config (Claude Desktop, Cursor, Cline/Continue/Windsurf). For clients without MCP support, send plain JSON‑RPC 2.0 POST requests to the same endpoint.

Key features of Callsphere

Full‑text search across 500+ voice‑AI articles
Industry‑aware ROI calculator with transparent assumptions
Case studies for 6 verticals (dental, healthcare, HVAC, real estate, salon, law)
Canonical product info: pricing, integrations, compliance, languages
No authentication required – free and public (read‑only)
Rate limited to 120 requests per minute per IP

Use cases of Callsphere

Search for articles on building MCP servers with Twilio
Calculate voice‑AI ROI for a dental practice or other vertical
Retrieve a case study for HVAC after‑hours dispatch
Compare pricing tiers and check HIPAA readiness
Look up supported languages and compliance posture

FAQ from Callsphere

What transport does Callsphere use?

Streamable HTTP. The endpoint is https://callsphere.ai/api/mcp.

Does Callsphere require authentication?

No – it is free, public, and read‑only. No API key or sign‑up is needed.

What rate limits apply?

120 requests per minute per IP address.

Can I use Callsphere with ChatGPT?

Yes – ChatGPT and any HTTP client can call the endpoint with plain JSON‑RPC 2.0 POST requests (example curl provided in the README).

What tools are available?

Five tools: search_voice_ai_docs, read_doc, calculate_voice_ai_roi, get_industry_case_study, and get_callsphere_info.

What is NOT in this server yet?

Phase 2 write tools (outbound demo calls, newsletter signup, demo booking) are intentionally paused because they would incur per‑call costs on free public infrastructure.