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
AwrAIter — Telegram channels

Telegram channels you administer: analytics, content plans, scheduled publishing. No userbot

Data & AnalyticsCommunication & messaging

Requires authNot measured6 / 22
Bird

Send and receive across email, SMS, WhatsApp, and voice. One API, one contract.

ProductivityCommunication & messaging

Requires authNot measured6 / 22
BlitzAPI

Search and enrich B2B companies and people: verified work emails, US phone numbers, job postings.

ProductivityCommunication & messaging

Requires authNot measured6 / 22Not checked yet
FlowCastle

Build, edit, and deploy Telegram bots on FlowCastle's hosted visual flow platform.

OtherCommunication & messaging

Requires authNot measured6 / 22Not checked yet
FullEnrich

Search B2B contacts, enrich verified emails and phone numbers, and export results.

Developer ToolsCommunication & messaging

Requires authOutdated checkNot measured6 / 22
LMCP

Mac & Windows: let ChatGPT, Claude & Cursor use your email, calendar, iMessage, Teams, files.

ProductivityCommunication & messaging

Requires authNot measured6 / 22
Minds: Synthetic Market Research Panels

Run AI market research: synthetic customer panels for concept testing, message testing, segments.

OtherCommunication & messaging

Requires authNot measured6 / 22
Multi Calendar

Outlook.com, Microsoft 365, Google, iCloud, CalDAV: free time, events, invites, bookings, polls.

ProductivityCommunication & messaging

Requires authNot measured6 / 22
Multi Mail

Gmail, Outlook, Hotmail, Microsoft 365, iCloud, Fastmail, other IMAP mailboxes: search, read, send.

ProductivityCommunication & messaging

Requires authNot measured6 / 22
dev.mailkite/mailkite

Send email, manage domains, DNS, webhooks, templates, and inbound routing on MailKite

ProductivityCommunication & messaging

Outdated checkNot measured5 / 22
dev.primitive/email

Email infrastructure for AI agents — send, receive, search, and reply to email over MCP.

ProductivityCommunication & messaging

Outdated checkNot measured5 / 22
io.github.acrylicfiddle/x402tools

10 pay-per-call tools for AI agents: QR, screenshots, DNS, OCR, PDF, email & more. USDC on Base.

Developer ToolsCommunication & messaging

Outdated checkNot measured5 / 22
io.github.anima-labs-ai/anima

Give your AI agent an identity it owns: email inbox, US phone number, SMS, voice, and a vault.

ProductivityCommunication & messaging

Outdated checkNot measured5 / 22
io.github.Firrton/defigent

Agent messaging inbox (A2A, EIP-712 signed), ERC-8004 directory, status and text hashing for Monad.

Developer ToolsCommunication & messaging

UnreachableNot measured5 / 22
uk.quantdata/quantdata

Four market-statistics tools + a free qd_ key by email: 1 anonymous look, then 10 calls/UTC day.

Data & AnalyticsCommunication & messaging

Outdated checkNot measured5 / 22
Agent Tools

9 utility tools for agents: DNS, WHOIS, email, IP, URL, headers, QR, text, tech. x402 on Base.

Developer ToolsCommunication & messaging

Outdated checkNot measured5 / 22
Callsign

Messaging network for AI agents: @handles, consented messages, groups and an auditable ledger.

Finance & CryptoCommunication & messaging

UnreachableNot measured5 / 22
Company Enrichment API

Company firmographics from domain: name, socials, tech stack, emails, phone, address

Developer ToolsCommunication & messaging

UnreachableNot measured5 / 22
Could Have Been Email

could-have-been-email MCP — wraps StupidAPIs (keyless — no credential needed)

Developer ToolsCommunication & messaging

UnreachableNot measured5 / 22
DMARC Shark — Email DNS Checker

Check a domain's public SPF, DMARC, MX and DKIM DNS records on demand. No account required.

ProductivityCommunication & messaging

UnreachableNot measured5 / 22
Domain & Company Intel MCP

Domain intel for AI agents: RDAP registration, DNS, email deliverability, tech stack.

Developer ToolsCommunication & messaging

Outdated checkNot measured5 / 22
Email Deliverability Audit API

Audit email domain deliverability: SPF, DKIM, DMARC, MX. Score 0-100. x402.

Developer ToolsCommunication & messaging

UnreachableNot measured5 / 22
Email Finder API

Find email addresses from name and company domain. x402 paid.

Developer ToolsCommunication & messaging

UnreachableNot measured5 / 22
Email Send API

Send emails programmatically via Resend. Text and HTML. x402 micropayment.

Developer ToolsCommunication & messaging

UnreachableNot measured5 / 22

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