SMS

A self-hostable SMS relay for AI agents that uses an old Android phone and a prepaid SIM, exposed over MCP so clients like Claude, ChatGPT, and Cursor can send and receive real texts.

Hail is a communications MCP server for AI agents, giving them a phone number, SMS line, and email inbox through one endpoint. It supports inbound and outbound voice, text, and email, with managed cloud and open-source self-hosting options.

Open-source telephony infrastructure for AI agents. AgentLine provides a REST API and MCP server for making and receiving phone calls, handling SMS, and storing transcripts, with Docker-based local setup and a hosted option.

OP is an API that gives AI agents real phone numbers for account registration, OTP/2FA codes, SMS, and voice calls. The page shows a live product pitch, feature comparison, a simple API example, and multiple agent communication use cases.