Communication API Directory
Communication APIs with agent-ready surfaces — email, SMS, chat, voice.
4310
Sites Indexed
37
Avg Score
122 entries in this directory
S
20
+15 structured API
+5 AI robots
missing +25 llms.txt
Home | WMATA
wmata.com
Metro is the Washington, DC region’s public transportation system, offering bus and rail service across DC, Maryland, and Virginia. Find real-time arrivals, service alerts, schedules, trip planning tools, fares, and station information.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
ClickSend | Business SMS and MMS via Web, Integration or API
clicksend.com
Communicate with your customers and staff via SMS and MMS with ClickSend. From single to scale by web app, API or integration.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Effective Global Business Messaging API | SMS,WhatsApp,NumberLookUp APIs
d7networks.com
D7 Networks provides powerful messaging APIs for SMS, WhatsApp, and more. Reach customers globally with seamless, secure, and fast communication solutions.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Inbox Zero | Automate and clean your inbox
getinboxzero.com
Your AI executive assistant to reach inbox zero fast. Automate emails, bulk unsubscribe, block cold emails, and analytics. Open-source
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Email Validation API - Verify Email Address | MailboxValidator
mailboxvalidator.com
MailboxValidator email validation clean email lists and reduces bounce. It connects to the mail server and checks whether the mailbox exists or not.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Email Validation Service, Email List Cleaning<!-- --> | CampaignKit
campaignkit.cc
Email validation service. Clean your email lists to reduce bounces. Email List cleaning doesn't have to be expensive. Start your free trial today.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Find email addresses and send cold emails • Hunter
hunter.io
Hunter is the leading solution to find and verify professional email addresses. Start using Hunter and connect with the people that matter for your business.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Komo — The AI Revenue Engine
komo.ai
The AI Revenue Engine. Komo puts the repetitive work between your CRM and your inbox on autopilot — signal monitoring, research, drafting, meeting prep, follow-up, CRM updates — in one workflow, with you on every send that matters.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
DMARC Solution for Businesses | DmarcDkim.com
dmarcdkim.com
DmarcDkim.com provides an easy-to-follow action plan to help you resolve email delivery issues with DMARC.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
D
Twilio SendGrid | SendGrid Docs | Twilio
docs.sendgrid.com
Learn to send transactional and marketing emails at scale with the platform that offers a 99% deliverability rate. From quickstarts and onboarding guides to full API reference, the Twilio SendGrid docs have everything you need to send email at scale.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Tumblr
tumblr.com
Tumblr is the place you go to be yourself on the internet. No performance, no perfection. Just you, and the people who get it.
API
AI bots
communication
20
+15 structured API
+5 AI robots
missing +25 llms.txt
Find the Best Concerts Near You, Tour Dates & Tickets Worldwide | Songkick
songkick.com
Find live music near you, track your favorite artists, get instant concert alerts and buy tickets for all the best upcoming concerts.
API
AI bots
communication
20
+15 structured API
+5 AI robots
missing +25 llms.txt
Home | Twitch Developers
dev.twitch.tv
Live Streaming, Meet Developers.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
SigParser | Uncover Hidden Contacts & Streamline Email Parsing
sigparser.com
SigParser: Supercharge your marketing and contact data quality with automated contact extraction from emails, calendars, and address books in Outlook and Gmail.
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
SMS Messaging, Voice, Email, Video & Verification APIs | Sinch
sinch.com
Unlock meaningful conversations across the customer journey with programmable SMS, voice, email, video, & verification APIs!
API
Schema.org
communication
20
+15 structured API
+5 Schema.org
missing +25 llms.txt
Pushover: Simple Notifications for Android, iPhone, iPad, and Desktop
pushover.net
API
communication
15
+15 structured API
missing +25 llms.txt
15
+15 structured API
missing +25 llms.txt
X Developer Platform
developer.x.com
Use the X API with an all-new Developer Console and consumption-based billing. No fixed monthly costs, no monthly caps.
API
communication
15
+15 structured API
missing +25 llms.txt
Pusher | Leader In Realtime Technologies
pusher.com
Simple, scalable and reliable. Hosted realtime APIs loved by developers and trusted by giants. Build live dashboards, notifications, geotracking, chat and more.
API
communication
15
+15 structured API
missing +25 llms.txt
Multichannel 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.
API
communication
15
+15 structured API
missing +25 llms.txt
15
+15 structured API
missing +25 llms.txt
15
+15 structured API
missing +25 llms.txt
I
15
+15 structured API
missing +25 llms.txt
The SMS Works
thesmsworks.co.uk
Easy and fast SMS integration. SMS API account comes with free reply number and test credits. Developers love our copy and paste code samples and top-notch support.
API
communication
15
+15 structured API
missing +25 llms.txt
M
Model Context Protocol (MCP) | Intercom and Fin Developer Platform
mcp.intercom.com
Faster resolutions, higher CSAT, and lighter support volumes with the only platform to combine the power of automation and human customer support.
API
communication
15
+15 structured API
missing +25 llms.txt
Magic Studio : Make beautiful images with AI
magicstudio.com
With Magic Studio anybody can use AI to create images, add & remove objects, backgrounds and more. Make beautiful images for product pages, ads & social media.
API
communication
15
+15 structured API
missing +25 llms.txt
ShareGPT: Share your wildest ChatGPT conversations with one click.
sharegpt.com
ShareGPT is a Chrome extension that allows you to share your wildest ChatGPT conversations with one click.
API
communication
15
+15 structured API
missing +25 llms.txt
F
file.io - Super simple file sharing
file.io
Sharing files with file.io is convenient, anonymous and secure. Just upload files and share the links via email, SMS, Slack, Discord, etc. Easy-to-use REST API.
API
communication
15
+15 structured API
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"
Agent Docs
Hiring AI / agentic engineers?
Live feed of AI/agent roles from AI Dev Jobs — 8,000+ positions, 489 companies:
Free: Monitor Your Agentic Readiness
We'll email you when your site's agent signals regress — so you catch it before your AI traffic drops. One email per week, only on real regressions.
Set up free monitoring →Submit Your Site
Get crawled and scored on agentic readiness. Appear in agent search results.