CallSphere MCP Server

Read-only MCP server giving any AI assistant — Claude, Claude Desktop, Cursor, Cline, Continue, Windsurf, Zed, or ChatGPT via JSON-RPC — direct access to CallSphere's voice-AI knowledge base, industry ROI calculator, case studies, and product facts.

Endpoint: https://callsphere.ai/api/mcp · Transport: Streamable HTTP · Auth: none · Rate limit: 120 req/min/IP

Tools

• search_voice_ai_docs — Full-text search across 500+ CallSphere articles on voice AI, MCP, Claude, agentic AI, Twilio/WebRTC.
• read_doc — Fetch the full markdown body of a single post by slug.
• calculate_voice_ai_roi — Industry-aware ROI math (dental, healthcare, HVAC, real estate, salon, law). Returns monthly + annual savings, payback period, recommended plan, and the assumptions used so the AI shows its work.
• get_industry_case_study — Narrative case studies for 6 verticals.
• get_callsphere_info — Canonical lookup: pricing tiers, integrations, compliance posture, supported languages, founder contact.

Install

Claude Code

claude mcp add --transport http callsphere https://callsphere.ai/api/mcp
Claude Desktop
Edit claude_desktop_config.json (Settings → Developer → Edit Config) and merge:
{
 "mcpServers": {
 "callsphere": {
 "command": "npx",
 "args": ["-y", "mcp-remote", "https://callsphere.ai/api/mcp"]
 }
 }
}
Cursor
Settings → MCP → Add new MCP server:
{
 "mcpServers": {
 "callsphere": {
 "url": "https://callsphere.ai/api/mcp",
 "transport": "http"
 }
 }
}
ChatGPT / any HTTP client
The same endpoint accepts plain JSON-RPC 2.0 POST. Example with curl:
curl -sS https://callsphere.ai/api/mcp \
 -H 'Content-Type: application/json' \
 -d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
 "params":{"name":"calculate_voice_ai_roi",
 "arguments":{"industry":"dental","monthly_calls":1200}}}'
Try these prompts after installing
- "Search CallSphere for articles on building MCP servers with Twilio."
- "Calculate the voice-AI ROI for a 4-provider dental practice doing 1,500 calls a month — show your
assumptions."
- "Show me a case study for HVAC after-hours dispatch."
- "What languages does CallSphere support, and is it HIPAA-ready?"
Discovery
- Manifest: https://callsphere.ai/.well-known/mcp.json
- Docs / install: https://callsphere.ai/mcp
- Source: https://github.com/CallSphere-LLC/mcp-server
License
Free, public, read-only. No API key. Maintained by CallSphere LLC.
If the form rejects long content, here's a **120-character short** version:
Voice-AI knowledge + ROI MCP server. Search 500+ articles, compute industry ROI, fetch case studies. Free,
 public, read-only.
And a **300-character medium** version:
Public MCP server giving any AI assistant — Claude, ChatGPT, Cursor, Cline — access to CallSphere's
voice-AI knowledge base (500+ articles), industry-aware ROI calculator, case studies for 6 verticals, and
product facts. Read-only, no API key, free. Discovery manifest at /.well-known/mcp.json.