Account

Communication API Directory

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

5686
Sites Indexed
39
Avg Score
175 entries in this directory
Spook - Get organic traffic on auto-pilot
tryspook.com
Spook finds winnable Google & ChatGPT queries, writes SEO content, and publishes automatically, growing organic traffic while you focus on your business.
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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
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Free AI Email Marketing Platform | MisarMail
mail.misar.io
Free AI email marketing platform: send bulk campaigns, automate email flows, manage a shared inbox, and use your own domain or a free @misar.io address. No credit card required.
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RankBull: AI Visibility & AI SEO for Small Businesses and Shopify
rankbull.io
RankBull shows whether ChatGPT, Google and other AI recommend your business or Shopify store, then writes and publishes the fixes. Free AI visibility report.
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InboxGuard — Email deliverability monitoring & DMARC reports
inboxguard.io
Continuous SPF, DKIM, DMARC, MTA-STS, BIMI, and 13-DNSBL monitoring for engineering teams shipping transactional and lifecycle email. Daily scans, instant alerts, hosted DMARC reports.
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Abundance APIs — Simple, affordable APIs for developers
abundanceapis.com
A small catalog of fast, affordable, no-nonsense APIs — CORS proxy, PDF tools, email validation, IP geolocation, and currency exchange rates. Generous free tiers, clean JSON, available on RapidAPI.
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SignupBouncer: block disposable emails and fake signups
signupbouncer.com
Check new signups for disposable emails, Gmail aliases and repeat accounts. Use it as a Supabase auth hook or call the REST API. The Free plan needs no card.
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Customer support that answers before your team has to · Communicate
communicate.so
Give the assistant your help content, allow only the tasks you choose, and bring in a teammate when a customer needs a person.
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Resend · Email for developers
resend.com
The best way to reach humans instead of spam folders. Deliver transactional and marketing emails at scale.
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TLS Radar - SSL/TLS Certificate Monitoring
tlsradar.com
Free SSL/TLS certificate monitoring with real-time expiry alerts. Run a free SSL scan, issue a free 90-day certificate, and catch misconfigurations and vulnerabilities before they cause downtime.
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Free Form Backend & Contact Form for Websites | splitforms
splitforms.com
Point any HTML, React, Next.js or AI-built contact form at one URL and get each submission by email and in a dashboard. 500 free submissions, no card.
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FormsList - Form Backend as a Service
formslist.com
Point your HTML form to FormsList. We handle submissions, notifications, spam filtering, and integrations. No server code required. Free plan included.
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Echo Agent — AI event discovery & outreach
yourechoagent.com
Find conferences, webinars, podcasts and communities in your niche. AI drafts outreach and triages replies. 50 free emails.
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SecondSim: Real UK Mobile Number for Business & WhatsApp
secondsim.co.uk
Real UK mobile number via eSIM — not VoIP, not virtual. Guaranteed to verify on WhatsApp Business, Monzo, Barclays and more. No contract. From £5.99/mo.
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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.
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ReadGZH - 微信文章 AI 阅读器 | 让 AI 读懂微信公众号
readgzh.site
ReadGZH：粘贴微信公众号文章链接，一键生成 AI 可直接读取的精简页面。支持 REST API 与 MCP 协议，可配合 ChatGPT、Claude、DeepSeek、豆包等工具使用；缓存文章读取不扣积分。
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Find your next customers | Argorant
argorant.com
Search 626.5M B2B contacts by what a company does. Find decision-makers and check every work email live before you export. No annual lock-in.
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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.
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Slack | AI Work Platform & Productivity Tools
join.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.
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Everlange — AEO, GEO & AIO software: 67-criteria audit | Get cited by AI
aeotool.io
Everlange is the AEO software (AEO / GEO SaaS) that audits your website against 67 criteria and gets it cited by ChatGPT, Claude, Gemini, Perplexity, Copilot, Grok and Google AI Overviews. Answer Engine Optimization (AEO), Generative Engine Optimization (GEO) and AI Overviews Optimization (AIO). First AEO audit free.
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Oblipali — SMS marketing Shopify, Sheets et agents IA
oblipali.app
Automatisez vos SMS : relance de paniers abandonnés Shopify, envois depuis Google Sheets et Trello, API MCP pour agents IA. Tarifs transparents, 90+ pays.
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Slack developer docs | Slack Developer Docs
api.slack.com
Plugin for querying Slack.
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Pantry App for ChatGPT & Claude | Pantry Persona
pantrypersona.com
The complete pantry app for ChatGPT and Claude. Remembers your pantry, recipes, and meal plans across every conversation.
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DMARC enforcement without blocking your mail | DomainCanary
domaincanary.com
Move your domain to p=reject a step at a time, and approve each step. With hosted DMARC, if a step blocks your own email, we put the previous policy back.
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13F.chat — 13F Holdings Chat and AI Portfolio Research
13f.chat
13F.chat turns SEC 13F filings into decisions: track what top managers bought, at what estimated cost, and follow smart money with AI explanations.
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ReLU.chat — Free Learning Assistants That Run in Your Browser
relu.chat
Free learning assistants for game theory, data science, reinforcement learning, linear algebra and more. Worked answers with the math shown. No account; chats stay in your browser.
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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.
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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.
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Mother — Anonymous AI Chat, No Account | MU/TH/UR 6000
mu7hur.com
Chat with Mother, an anonymous AI terminal for writing, research, coding and private apps. No account required. Choose SMART or UNCENSORED for fewer restrictions.
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Get Your Business Recommended by ChatGPT | Rankli
rankli.io
Find the questions customers ask ChatGPT, Claude and Gemini. Rankli publishes the answers, then asks again to see if AI starts recommending you.
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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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