MCP HeartbeatTHE MCP OBSERVATORY
Public workspace

Explore

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.

Connect your agent

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
GrowVib: Social Media Growth

Discover, compare and buy social media growth (Instagram, TikTok, YouTube, Telegram, X); x402 ready

Marketing & SalesCommunication & messaging

Outdated check674 ms13 / 22
WarmInboxes Free MCP

Read-only deliverability + strategy: free cold email checks, list tools, inbox planning, research.

ProductivityCommunication & messaging

Outdated check687 ms13 / 22
Synoptic

Follow live feeds from Twitter/X, Telegram, press releases, SEC filings and more; publish your own.

OtherCommunication & messaging

Outdated check698 ms13 / 22
Tenpace Review Router

Human-authenticated setup for routing GitHub pull requests into the right Slack channel.

Developer ToolsCommunication & messaging

Responded720 ms13 / 22
Voidmail (hosted)

Hosted agent inboxes: read mail, send to owner-approved recipients. Mail is server-readable.

Developer ToolsCommunication & messaging

Outdated check763 ms13 / 22
com.postboxservices/postbox-tools

Free email checks: 24 blacklists, spoofing grade, redirects, spam test, WHOIS, BIMI, AI readiness.

ProductivityCommunication & messaging

Responded767 ms13 / 22
DealMachine

Find US property owners, including LLCs, plus owner phones and emails. Needs a DealMachine account.

Developer ToolsCommunication & messaging

Responded800 ms13 / 22
Dominick Prevete: Instant Term Sheet

Written term sheets for 1–4 unit DSCR investment property loans, by email. Business-purpose only.

ProductivityCommunication & messaging

Outdated check837 ms13 / 22
Rate Ranger

Watch a hotel's price after your user booked it, and email them when it drops enough to rebook.

TravelCommunication & messaging

Outdated check929 ms13 / 22
com.thejohnsonbros/plumbing-booking

Johnson Bros. Plumbing: check coverage, services, pricing, availability, and book by SMS.

ProductivityCommunication & messaging

Responded993 ms13 / 22
I'm In! Sign-up Sheets

Turn an email, notes or a flyer into a free sign-up sheet with reminders and waitlists.

ProductivityCommunication & messaging

Outdated check1005 ms13 / 22
RealMarket Site Check

Passive checks of a public website: email authentication (SPF, DKIM, DMARC) and basic security.

ProductivityCommunication & messaging

Outdated check1090 ms13 / 22
ProfessionalHeadshot.io

LinkedIn, Slack and GitHub profile photo specs, headshot style guides and a free headshot audit.

MediaCommunication & messaging

Responded1114 ms13 / 22
Dominick Prevete: Instant Fix-and-Flip Term Sheet

Written fix-and-flip term sheets for 1–4 unit investment purchases, by email. Business-purpose only.

ProductivityCommunication & messaging

Outdated check1129 ms13 / 22
Panda Greetings

Printed greeting cards: find designs with your message inside, then order on our site.

OtherCommunication & messaging

Outdated check1381 ms13 / 22
pg.ddx.io: the PostgreSQL community's memory

Every PostgreSQL mailing list since 1991, linked to the commits, code, commitfest and docs.

Developer ToolsCommunication & messaging

Outdated check2228 ms13 / 22
MSG91

Find and call the right MSG91 API for SMS, OTP, WhatsApp, Email and Voice.

ProductivityCommunication & messaging

Responded2814 ms13 / 22
Fieldwright

Fieldwright: web page to clean Markdown, metadata, JSON-LD, emails, phones.

Developer ToolsCommunication & messaging

Responded203 ms13 / 22
io.github.geekmarine/mcp-email-auditor

Validates domain email MX records and DNS status via Cloudflare DNS-over-HTTPS.

Developer ToolsCommunication & messaging

Responded53 ms13 / 22
io.github.geekmarine/mcp-domain-auditor

DNS resolution, HTTP security headers, and SPF/DMARC email hygiene audits.

Developer ToolsCommunication & messaging

Responded62 ms13 / 22
Xposedornot

XposedOrNot MCP — free breach-exposure lookup by email.

Developer ToolsCommunication & messaging

Responded101 ms13 / 22
Leadmagic

LeadMagic MCP — wraps the LeadMagic B2B email-finder API (leadmagic.io)

Developer ToolsCommunication & messaging

Outdated check108 ms13 / 22
Klaviyo

Klaviyo MCP Pack — wraps the Klaviyo API for email marketing

Marketing & SalesCommunication & messaging

Outdated check108 ms13 / 22
Icypeas

Icypeas MCP — wraps the Icypeas email-search API (icypeas.com)

Developer ToolsCommunication & messaging

Outdated check109 ms13 / 22

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