Spix
Spix gives AI agents a real phone number, SMS inbox, and email address so they can communicate with humans programmatically.
About
Spix gives AI agents a real phone number, SMS inbox, and email address so they can communicate with humans programmatically. It handles the full communications stack — outbound calls with sub-300ms voice latency, two-way SMS with opt-out compliance baked in, and deliverable email with proper DKIM/SPF/DMARC setup. Everything lands in a unified inbox you can query via CLI, REST API, or MCP tools.
Developers building AI agents that need to reach real people — think appointment reminders, lead qualification, customer support handoffs, or healthcare follow-ups. If your agent currently has no way to pick up the phone or send a text, Spix is the fastest path to fixing that.
Pros & Cons
Pros
- check Three communication channels (voice, SMS, email) in a single product, avoiding the need to stitch together multiple services
- check OpenAI-compatible MCP integration means agents can trigger calls and messages without custom glue code
- check Free sandbox tier available for testing before committing to a paid plan
Cons
- close Credit-based pricing means costs can be hard to predict at scale — outbound calls burn 10 credits per minute, which adds up fast for voice-heavy workflows
- close No self-hosting option; all communications route through Spix's infrastructure, which may be a concern for sensitive industries
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