MCP HeartbeatTHE MCP OBSERVATORY
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Evidence for your next connection.

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

Read-only probes

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
DarkFunnels

WhatsApp AI sales agent on your own number via QR, no Meta API: audit chats, edit playbook, orders.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
Data Gleaner

Pay-per-result web data tools: company contacts and emails, leads, China social, apps.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22Not checked yet
day3

Draft email campaigns in day3 from Claude Code, Cursor or VS Code as editable composer blocks.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Dead Simple Email

Give an agent its own inbox: send, receive, and pull signup codes from real email.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Detritus Site Services: Your Account

Manage your Detritus account: sites, services, quotes, invoices, and notifications.

Finance & CryptoCommunication & messaging

Requires authOutdated checkNot measured5 / 22
DevInbox

Real email inboxes for AI agents: create inboxes, catch verification codes, extract OTPs, reply.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
DiscordServers

Search Discord server listings, and manage your own servers once you sign in.

OtherCommunication & messaging

Requires authNot measured5 / 22
DocVerdict

PDF, photo, email, and file comparison evidence checks with plain-language reports.

MediaCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Domain Lab

Track domain expiry, DNS, SSL and email security across registrars, and explain what changed.

ProductivityCommunication & messaging

Requires authNot measured5 / 22
DomainDNA: Tech Stack Detector, WHOIS & Domain Age API

DomainDNA: a domain's tech stack, email security (MX/SPF/DMARC), TLS expiry and age in one record.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
DomainDNA: Tech Stack Detector, WHOIS & Domain Age API

DomainDNA: a domain's tech stack, email security (MX/SPF/DMARC), TLS expiry and age in one record.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
dopost

Schedule and analyze posts on 12 networks, incl. Bluesky, Mastodon and Telegram, from any AI agent

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
e2a — email for AI agents

Authenticated email gateway for AI agents — per-agent inboxes, HITL approval, SPF/DKIM verified.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
e2a — email for AI agents

Authenticated email gateway for AI agents — per-agent inboxes, HITL approval, SPF/DKIM verified.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Eli

AI ops team for founders: approvals queue, inbox triage, briefing, follow-up drafting.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Requires authNot measured5 / 22Not checked yet
Email Finder Server

Extract emails and phones from any website via Apify.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
Email Inbox API + Sending by Sendmux

AI email inbox and sending tools with attachments, search, live events, and webhooks.

ProductivityCommunication & messaging

Requires authNot measured5 / 22
Email Validator (MX, Disposable, Typo)

Validate emails without sending mail: syntax, MX, disposable, role and typo checks, SPF/DMARC.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Email Verifier (SMTP, MX, Catch-All)

Bulk email verification: live SMTP mailbox check, MX, catch-all, disposable and role detection.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Email Verifier MCP

Verify email deliverability with RFC format, MX, SMTP and disposable-domain checks.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
Email Verify

Verify email addresses in chat: real-time deliverability checks with a clear verdict.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
Emailit

Send email, run campaigns and automations, manage contacts and domains, fix deliverability.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22
emailverifier.dev

Verify emails and domains for routing, disposable providers, role accounts, and SMTP risk.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22

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