MCP HeartbeatTHE MCP OBSERVATORY
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Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

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DiscoveryServer directory

Remote MCP servers

Find a server for your workflow, with connection evidence you can inspect.

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1424 servers

Ordered by checks passedClear filters
Dated server measurements. The status describes the last probe or a listed authentication requirement. Checks that have not been measured are not failures. Open a server to inspect the evidence.
Server / capabilityLast probeMedian latencyChecks passedLast checked
dev.mailkite/mail-send

Send transactional email over a verified domain — templates, attachments, custom headers.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured5 / 22
io.github.antoinedelorme/kweenkl-mcp

Push notifications for AI agents - send instant iPhone notifications from any MCP client.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
io.github.aymandakir-gh/piu-copy-mcp

GrowthHackers copywriting prompts (Meta/Google Ads, email, VSL) as MCP tools — search & generate.

Marketing & SalesCommunication & messaging

Requires authOutdated checkNot measured5 / 22
io.github.Mewnah/stack-and-dns-mcp

Inspect any domain: tech stack, SPF/DKIM/DMARC/MX email health and security posture, for AI agents

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
io.github.SadaSend/sadasend

Transactional email API & AI agent safety runtime with 12 scoped tools and SpendGuard.

Developer ToolsCommunication & messaging

Requires authOutdated checkNot measured5 / 22
io.github.singleflo/evolution-api-mcp

Operate one Evolution API (WhatsApp) instance: chats, history, sending, groups, settings.

Developer ToolsCommunication & messaging

Requires authOutdated checkNot measured5 / 22
io.github.Yersat/chatflow

WhatsApp CRM for AI agents: search contacts, read chats, manage the sales pipeline, send messages.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
io.github.YS-projectcalc/agent-cold-email

Coldrig — cold-email infra run by your agent: 28 MCP tools, live sending, free sandbox, from $99/mo.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
me.wacli/whatsapp

Your own WhatsApp as an MCP server: read, search and send from any MCP client.

Developer ToolsCommunication & messaging

Requires authOutdated checkNot measured5 / 22
pro.chat-master/chat-master

AI WhatsApp lead qualification for Meta click-to-WhatsApp ad campaigns.

Marketing & SalesCommunication & messaging

Requires authOutdated checkNot measured5 / 22
run.domani/domani

Internet identity for AI agents: register or broker domains, email, DNS - pay by card or USDC.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured5 / 22
sh.crispy/crispy

Full LinkedIn access for AI agents: leads, messaging, and campaigns with activity limits built in.

Marketing & SalesCommunication & messaging

Requires authOutdated checkNot measured5 / 22
24Repost

Cross-posting between Telegram, MAX and VK: routes, copy rules, history import, chatbots.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
AdminHub for Telegram

Run a Telegram channel from your AI agent. Posts go out through your own bot, not your account.

Developer ToolsCommunication & messaging

Requires authOutdated checkNot measured5 / 22
Aerosend

Manage Aerosend cold email domains, mailboxes, tags, warmup, inbox placement and domain burn.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Agent Broker

23 MCP tools: compliance, verification, messaging, booking, US contracts. 15 need no key.

LegalCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Agent Channel

One identity across Claude Code, Codex, Cursor, Gemini, Windsurf: shared inbox and handoffs.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
Agent Data Tools: Company, compliance and checks

50 tools: OFAC sanctions, counterparty checks, company, domain, email. 25 free calls.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Agent Push Kit

Send, search, and manage notifications, accounts, and push preferences

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Agent-Native Brain

Cited company knowledge from Slack, meetings, transcripts, and decisions

ProductivityCommunication & messaging

Requires authNot measured5 / 22
Agent-Native Dispatch

Central Slack/Telegram router with jobs, memory, approvals, and A2A delegation

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
Agent-Native Mail

Agent-Native Superhuman - email client with keyboard shortcuts and AI triage

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
AgentAlarm

Notifications, reminders and alarm-style alerts on the user's iPhone. Sign in with OAuth.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
AgentFirstStack

Analytics, tag manager, email inboxes and session replay an AI agent sets up itself. Open source.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet

Automated measurements. Not a rating. Unmeasured checks are not failures. How to read the evidence