Hail
Send and receive emails, calls, SMS via a single MCP/API/CLI
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What is Hail?
Hail is a platform that enables AI agents to communicate via phone calls, SMS, and email through a unified API, MCP, and CLI interface. It handles compliance, deliverability, and carrier management while integrating with popular AI models and communication providers.
Hail pricing
Pricing model: Freemium
Pay-per-use: Pilot $50 (500 min calls, 2,777 texts, or 50,000 emails), Team $250 (2,500/13,888/250,000), Scale $1,000 (10,000/55,555/1,000,000). Mix channels, top up any amount, no expiring credits, no subscriptions.
Hail pros
- Multi-channel communication (phone, SMS, email) unified in one platform for agents
- Works directly in coding agents and backends via MCP (one-click OAuth), CLI, and REST API—no new workflows
- Compliance and deliverability fully managed (SPF/DKIM/DMARC, opt-outs, registered numbers, open/bounce tracking)
- Multi-language support with sub-800ms call latency; from first prompt to production in ~5 minutes
- Self-hostable with AGPL open-source option; managed cloud is pay-per-use with no subscriptions
Hail cons
- Agent wallet feature (budget controls and auto-approval) is still coming soon—not yet available
- Requires integration with external providers (Twilio, Telnyx, AWS SES, etc.) or bring-your-own infrastructure
- Limited transparency on advanced features and edge cases—documentation links suggest many details require reading docs
Frequently asked questions about Hail
How do I integrate Hail with my AI agent?
Via MCP (one-click OAuth in Claude, ChatGPT, Cursor), CLI (brew install), or REST API with bearer tokens and Python SDK.
Do I need to own phone numbers and email domains?
No—you can bring your own or use Hail's pre-warmed domains and registered numbers from day one. Hail handles all compliance.
Can I self-host Hail?
Yes, the entire platform is open-source under AGPL. Managed cloud is pay-per-use; no subscription required.
What integrations does Hail support?
Twilio, Telnyx, AWS SES, Deepgram, ElevenLabs, LiveKit, Stripe, OpenAI, Anthropic, Gemini, and voice/text providers.