A directory of services AI agents can actually use — APIs, tools and merchants with machine-readable interfaces and agent payment protocols. Badges are probe-backed, never self-asserted.
| Score |
|---|
 LiveKitMCPOpenAPIllms.txt Open-source realtime media infrastructure with the Agents framework, SIP, and phone numbers | Messaging | ||
 ResendMCPOpenAPIllms.txt Email API for developers with React Email, batch sending, and an official MCP server | Messaging | ||
 VapiMCPOpenAPIllms.txt Voice agent platform handling telephony, turn-taking, interruptions, and warm transfers | Messaging | ||
 Discord APIOpenAPI Bot API with gateway events, slash commands, and webhooks | Messaging | ||
 IntercomMCPOpenAPIllms.txt Support inbox, tickets, and conversations over API and a remote MCP server | Messaging | ||
 KnockMCPOpenAPIllms.txt Notification infrastructure API — workflows, preferences, and multi-channel delivery for agent output | Messaging | ||
 PostmarkOpenAPIllms.txt Transactional email with high deliverability and detailed delivery webhooks | Messaging | ||
 Retell AIOpenAPIllms.txt Managed phone agents with conversation design, simulation testing, and production monitoring | Messaging | ||
 SendGridOpenAPI Email delivery and marketing API by Twilio | Messaging | ||
 Slack APIMCPOpenAPIllms.txt Post, search, and automate in Slack workspaces via API or the official admin-approved MCP server | Messaging | ||
 TwilioMCPOpenAPIllms.txt SMS, voice, WhatsApp, and verification APIs, with an official MCP server over the platform | Messaging | ||
 PusherOpenAPI Hosted realtime channels and WebSocket delivery | Messaging |
Same query as JSON: /api/v1/services?category=communicate