Communication API Directory

Communication APIs with agent-ready surfaces — email, SMS, chat, voice.

4191
Sites Indexed
36
Avg Score
120 entries in this directory
Mail a letter online in minutes | PostalForm
postalform.com
Upload a file or write a letter online, confirm addresses, and PostalForm prints and mails it for you. We prepare the envelope and postage and hand it to USPS.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP communication
100
+25 llms.txt +20 ai-plugin
MisarMail — Email Marketing, Automations & Custom Domains | MisarMail.com
mail.misar.io
Send bulk campaigns, automate email flows, manage a shared inbox, and use your own domain or a free @misar.io address. Self-hosted email that scales.
llms.txt ai-plugin OpenAPI API AI bots Schema.org communication
90
+25 llms.txt +20 ai-plugin missing +10 MCP
Resend · Email for developers
resend.com
The best way to reach humans instead of spam folders. Deliver transactional and marketing emails at scale.
llms.txt OpenAPI API Schema.org MCP communication
75
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
SecondSIM: Real UK Mobile Number for Business & WhatsApp | From £5.99
secondsim.co.uk
Get an instant UK eSIM with a real mobile number in minutes. Works for WhatsApp Business, bank verification & more. Non-VoIP, no contract — from £5.99/mo. Delivered by email.
llms.txt ai-plugin API AI bots Schema.org communication
70
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
J
Social Media Content AI Operating System | Viral Worx
jasonmartocci.com
Plan posts, write scripts and titles, make thumbnails and video briefs, schedule content, and track results across YouTube, TikTok, Instagram, and Facebook.
llms.txt OpenAPI API AI bots Schema.org communication
70
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Slack | AI Work Platform & Productivity Tools
slack.com
Boost productivity and save time with Slack‌ — ‌the AI work platform for managing projects, automating workflows, and connecting teams securely. Start working smarter today.
llms.txt ai-plugin API communication
60
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
Slack developer docs | Slack Developer Docs
api.slack.com
Plugin for querying Slack.
llms.txt ai-plugin API communication
60
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
Pantry Persona — The Complete Pantry App for ChatGPT & Claude
pantrypersona.com
The complete pantry app for ChatGPT and Claude. Remembers your pantry, recipes, and meal plans across every conversation.
llms.txt API AI bots Schema.org MCP communication
60
+25 llms.txt +15 structured API missing +20 ai-plugin
Kweenkl — Push Notifications for AI Agents | Claude, ChatGPT, MCP
kweenkl.com
The push notification layer for AI agents. Give Claude, ChatGPT, or any autonomous agent a direct line to your iPhone via MCP or a simple HTTP POST. Also works with Zapier, Make, n8n, and 5,000+ apps.
llms.txt API Schema.org MCP communication
55
+25 llms.txt +15 structured API missing +20 ai-plugin
Synlig | Norges ledende AEO-ekspert og AI-synlighet
synligdigital.no
Er bedriften din usynlig for ChatGPT, Perplexity og Google AI? Vi hjelper norske bedrifter med å bli synlige der kundene faktisk spør.
llms.txt API Schema.org MCP communication
55
+25 llms.txt +15 structured API missing +20 ai-plugin
Plain — The AI Support Stack Built for B2B
plain.com
Plain is the AI support stack built for B2B teams. Composable infrastructure that gives you complete flexibility to build a support motion that grows with your business — no-code or all-code.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
Loops - One platform for all your email
loops.so
Loops is the modern email platform for software companies. Create and send marketing email, product email and transactional email in just a few minutes.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
Manage ads right from ChatGPT and Claude | NotFair
adsagent.org
Give Claude live Google Ads access to diagnose issues, recommend fixes, and execute keyword, ad, budget, and negative changes only after approval.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
Muddy Terrain Games | AI plugins for Unreal Engine. Integrate ChatGPT, Qwen, Meshy, Claude, Gemini, Llama, Mistral, Tripo, DeepSeek, and 30+ LLMs into your game with GenAI for Unreal.
muddyterrain.com
AI plugins for Unreal Engine. Integrate ChatGPT, Qwen, Meshy, Claude, Gemini, Llama, Mistral, Tripo, DeepSeek, and 30+ LLMs into your game with GenAI for Unreal.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
beehiiv — The newsletter platform built for growth
beehiiv.com
Create, grow, and monetize your newsletter with easy-to-use newsletter tools. Build email newsletters and websites without any coding.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
DNS Lookup, Email Deliverability Test & Network Tools - SPF, DKIM, DMARC Checker - mailX
themailx.com
Free email deliverability test, DNS lookup & IP lookup. Check MX records, SPF, DKIM, DMARC, blacklist status, SMTP servers & more. Analyze your domain instantly
llms.txt API MCP communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
brag.fast | Keep building, we'll market
brag.fast
Turn shipped wins into branded visuals and post copy in seconds. Install the GitHub App, surface merges in your feed, brag when you're ready. Web app, MCP, or API. You approve every post.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
Ask AI — Ask questions about your Shopify data with Claude, ChatGPT & Gemini
ask-ai-data-connector.co.uk
Ask AI about your business and get real answers. Connect Shopify, Klaviyo, GA4, and 19+ sources to Claude, ChatGPT, or Gemini.
llms.txt OpenAPI Schema.org communication
50
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
LLMGenerator - Generate llms.txt & Markdown Files for AI Visibility
llmgenerator.com
Generate llms.txt, llms-full.txt, and markdown files for your website to make it extractable, citable, and authoritative to AI systems like ChatGPT, Claude, Gemini, and Perplexity. Start free today with 50 credits.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
FlowRunner | Run Salesforce Screen Flows in Outlook & Gmail
flow-runner.com
Run your Salesforce Screen Flows inside Outlook and Gmail. Records surface the moment an email opens, with context pre-filled. 14-day free trial.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
Bending Spoons
meetup.com
Find Meetup events, join groups, or start your own. Make new friends and connect with like-minded people. Meet people near you who share your interests.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
Alertoscan — Automated Website Forensics & Threat Intelligence
alertoscan.io
Run deep, anti-detection live scans on arbitrary domains. Extract forensic signals, map Neo4j threat correlations, compute a deterministic 14-chain trust score.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
LLMS Central - AI Bot Tracking, Citation Tracking & llms.txt Repository | LLMS Central
llmscentral.com
Track AI bots visiting your site + monitor when ChatGPT, Perplexity & Claude cite your domain. Free AI bot tracker with citation tracking, real-time analytics & llms.txt repository.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
ZYNT | Buying Signal Monitoring for B2B Sales Teams
getzynt.com
ZYNT monitors public sources for buying triggers in your target accounts. Alerts with context and recommended next steps. Done-for-you setup, live in days. Starting at $800/mo.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
CarScout - Your Car Search, On Autopilot
usecarscout.com
Set your criteria once. We scan thousands of dealers nationwide. Matches find you with daily alerts.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
Trilo — The AI Workspace for Teams | Chat, Tasks, Docs & Calendar
trilo.chat
Trilo is the AI workspace with autonomous coworkers that work 24/7. One app for meetings, tasks, docs, and calendar — no more tool sprawl.
llms.txt API AI bots Schema.org communication
50
+25 llms.txt +15 structured API missing +20 ai-plugin
AI-Powered Service Platform | Zendesk
zendesk.com
Move beyond deflection with AI agents that resolve issues end-to-end. Improve service quality, speed, and scale. Start your free trial.
llms.txt API Schema.org communication
45
+25 llms.txt +15 structured API missing +20 ai-plugin
Intercom | The only helpdesk designed for the AI Agent era
intercom.com
The only helpdesk with a natively integrated AI Agent. Deliver perfect customer experiences with the highest-performing platform. Start your free trial today.
llms.txt API Schema.org communication
45
+25 llms.txt +15 structured API missing +20 ai-plugin
Email & SMS Marketing Platform | Mailchimp
mailchimp.com
Utilize real-time user behavior data and artificial intelligence to convert more customers. Easy to use, get started for free!
llms.txt API Schema.org communication
45
+25 llms.txt +15 structured API missing +20 ai-plugin
Customer.io Platform: Automation, Data, Content Creation
customer.io
Explore Customer.io, the data-driven platform for personalized customer journeys across all channels, fueled by first-party data.
llms.txt API Schema.org communication
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+25 llms.txt +15 structured API missing +20 ai-plugin

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
llms.txt OpenAPI spec ai-plugin.json

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Use the public homepage. NHS checks standard paths like /llms.txt, OpenAPI, MCP, robots, and schema.