Communication API Directory
Communication APIs with agent-ready surfaces — email, SMS, chat, voice.
5287
Sites Indexed
38
Avg Score
154 entries in this directory
Ed Discussion
edstem.org
Ed Discussion helps scale course communication in a beautiful and intuitive interface. Questions reach and benefit all students in the class. Less email, more time saved.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
Secure, customizable & reliable WebRTC Video Calls| Whereby
whereby.com
Host quick instant meetings or embed video calls into your platform with Whereby’s video conferencing API and SDK.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
M
Communications infrastructure your AI agents operate — Bird
messagebird.com
Send and receive across email, SMS, WhatsApp, and voice. One API, one contract, on the network that already carries 40% of the world's commercial messages.
ai-plugin
API
Schema.org
communication
40
+20 ai-plugin
+15 structured API
missing +25 llms.txt
Customer Engagement Platform for Email, Push… - OneSignal
onesignal.com
The world's leader for mobile push notifications, web push, SMS, email and in-app messaging. Trusted by 2 million+ businesses to send 12 billion+ messages per…
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
Social technologies | Meta for Developers
developers.facebook.com
Use Meta's developer tools and resources to build solutions that help people connect and grow businesses.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
SendGrid Email API and Email Marketing Campaigns | Twilio
sendgrid.com
SendGrid's trusted email API and marketing campaigns platform is now available through Twilio.com.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
D
Welcome to Whereby Embedded | Whereby
docs.whereby.com
Whereby Embedded is the easiest way to add video calls to your web page or mobile app. Get up and running in minutes, not months, so you're free to focus on what you do best — your business.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
D
What is VDO.Ninja? | Ninja Docs
docs.vdo.ninja
"Vee-Dee-Oh" .. oh, video!
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
Courier | Customer messaging platform for humans & AI agents
courier.com
The messaging platform for humans and AI agents. Send multichannel notifications across email, push, SMS, Slack, and more, with journeys and preferences built in.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
Ship 10x smarter with perfect context | SpecStory
specstory.com
Never lose an AI conversation again. Automatically capture every chat from Cursor, Copilot, Claude Code & Codex. Save locally, access everywhere. Ship 10x smarter with perfect context.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
Pageradar : The best SEO alert tracker tool - Catch issues before Google
pageradar.io
Get instant SEO alerts for Core Web Vitals drops, HTML changes, broken pages & ranking losses. The best SEO alert tracker catches issues before Google penalties.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
BulkSMS.com | SMS Gateway to 213 Countries | BulkSMS.com
bulksms.com
Get your message across. One account, so many ways to send.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
T
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
Reliable Email Verification API - Mailboxlayer API Service
mailboxlayer.com
Simple and powerful email verification JSON API using SMTP, typo checks, syntax validation, and free and disposable provider filtering. Free for personal use.
llms.txt
API
communication
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
Mailsac : Disposable Email Testing Platform
mailsac.com
Test your application's email delivery with our disposable email services. Empower your QA and Software teams with integrations throughout the testing process.
OpenAPI
API
Schema.org
communication
40
+20 OpenAPI
+15 structured API
missing +25 llms.txt
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
S
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
D
40
+25 llms.txt
+15 structured API
missing +20 ai-plugin
Chat Expasy
chat.expasy.org
Assistant to navigate resources from the Swiss Institute of Bioinformatics (SIB).
OpenAPI
API
communication
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
ChatGPT Learn
learn.chatgpt.com
Use ChatGPT for ambitious work, creative projects, and software development.
API
AI bots
Schema.org
communication
25
+15 structured API
+5 AI robots
missing +25 llms.txt
R
Recordo - The AI Second Brain for ADHD
recordo.app
AI task manager for ADHD that works with ChatGPT & Claude. Capture ideas by voice, text, or photo. Never lose track again.
API
AI bots
Schema.org
communication
25
+15 structured API
+5 AI robots
missing +25 llms.txt
Quo (formerly OpenPhone) | Best Phone System for Startups & Small Businesses
openphone.com
Quo brings your calls, texts, and contacts together in one AI-powered shared space. Keep your team aligned, respond faster, and ensure every customer feels valued.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
CrawlBit · Get cited by ChatGPT, Perplexity, Claude and Gemini
crawlbit.app
CrawlBit audits your site for SEO and AI visibility, then shows you exactly what to fix so ChatGPT, Perplexity and Google AI Overviews cite you.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Inoreader – Build your own newsfeed
inoreader.com
With Inoreader, content comes to you the minute it's available. Follow websites, social media feeds, podcasts, blogs, and newsletters. Enjoy what's important to you, all in one place.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Shared markdown memory for Claude, ChatGPT & Cursor | Agentage
memory.agentage.io
Shared markdown memory for Claude, ChatGPT, Cursor & every AI - one MCP endpoint, files-first, EU-private, export anytime. Owned by you.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
One platform to connect | Zoom
api.zoom.us
Modernize workflows with Zoom's trusted collaboration tools: including video meetings, team chat, VoIP phone, webinars, whiteboard, contact center, and events.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
One platform to connect | Zoom
zoom.us
Modernize workflows with Zoom's trusted collaboration tools: including video meetings, Zoom Chat, VoIP phone, webinars, whiteboard, contact center, and events.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
The AI Customer Support Platform for Every Business - Crisp
crisp.chat
Crisp is the ultimate all-in-one AI-powered multichannel messaging platform that helps businesses connect instantly with their customers or leads who are waiting for support. With its quickly evolving set of tools, Crisp is leading businesses through the AI-driven revolution by using conversations to unlock hypergrowth.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Ecommerce Email Marketing & Automation | Drip
drip.com
Switch and save up to 40% on your email bill. Drip is an ecommerce email and automation built for lean teams: all the power, none of the bloat. Start free.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Discord - Group Chat That’s All Fun & Games
discord.com
Discord is great for playing games and chilling with friends, or even building a worldwide community. Customize your own space to talk, play, and hang out.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Wire NHS into your agent — MCP server
Add Not Human Search as an MCP tool. Your agent can call search_agents, get_site_details, get_stats, and submit_site at runtime.
Claude Code
claude mcp add --transport http nothumansearch https://nothumansearch.ai/mcp
Other clients: point any MCP-compatible tool at
https://nothumansearch.ai/mcp (streamable-http transport).Use NHS via REST
Prefer plain HTTP? Hit the search endpoint directly.
Search API
curl "https://nothumansearch.ai/api/v1/search?q=payment+API"
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