Side-by-side comparison of two Model Context Protocol servers — install paths, tools, quality signals, and directory engagement so you can pick the right one for Claude, Cursor, and other MCP clients.
Give AI agents a real phone number and voice. Make outbound calls, handle inbound calls, send email, and manage contacts via 26 MCP tools. 500ms voice latency (Deepgram Nova-3 + Claude + Cartesia Sonic-3). Install: pip install spix-mcp. Free tier available.
Send physical mail with Solana payments — AI agents can compose, price, and send letters and postcards via cryptocurrency.