LiveKit
Messaging
Open-source realtime media infrastructure with the Agents framework, SIP, and phone numbers
MCPOpenAPIllms.txt
API keysubscription
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.
Messaging
Email API for developers with React Email, batch sending, and an official MCP server
Messaging
Voice agent platform handling telephony, turn-taking, interruptions, and warm transfers
Messaging
Bot API with gateway events, slash commands, and webhooks
Messaging
Support inbox, tickets, and conversations over API and a remote MCP server
Messaging
Notification infrastructure API — workflows, preferences, and multi-channel delivery for agent output
Messaging
Transactional email with high deliverability and detailed delivery webhooks
Messaging
Managed phone agents with conversation design, simulation testing, and production monitoring
Messaging
Email delivery and marketing API by Twilio
Messaging
Post, search, and automate in Slack workspaces via API or the official admin-approved MCP server
Messaging
SMS, voice, WhatsApp, and verification APIs, with an official MCP server over the platform
Messaging
Hosted realtime channels and WebSocket delivery
Same query as JSON: /api/v1/services?category=communicate