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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1549 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
AgentKit x402 MCP server

Remote MCP tools for pay-per-call email, domain, SEO and Swedish data utilities (x402).

ProductivityCommunication & messaging

Outdated check57 ms13 / 22
heade.rs

Look up any domain, IP address or AS number: hosting, DNS, registration, email, TLS and headers.

ProductivityData access / search

Outdated check61 ms13 / 22
Camp Notice

Email alerts when a summer camp opens sign-ups, or when a sold-out camp has a seat open.

ProductivityCommunication & messaging

Outdated check61 ms13 / 22
LNX QR codes

Styled, print-ready QR codes for links, text, email or phone, with frames and custom colors.

ProductivityCommunication & messaging

Outdated check64 ms13 / 22
Northline WebKit

Pay-per-call web tools for agents: URL to markdown, metadata, links, DNS, email/domain checks, RDAP.

ProductivityCommunication & messaging

Outdated check64 ms13 / 22
GoTable MCP by usefulapi

Read availability, reservations, guests; create, change, cancel bookings; add notes in GoTable.

ProductivityFile & docs

Responded66 ms13 / 22
beep.me

Find when public events happen and get email reminders before them, following moved matches.

ProductivityCommunication & messaging

Outdated check66 ms13 / 22
P0: email check, uptime, web reader

Email address checks, URL uptime pings and web page to markdown for agents, pay per call

ProductivityMonitoring & observability

Outdated check66 ms13 / 22
Recapwren Client Reports

Weekly client reports: change, % change, targets, status, printable page and email text. Free.

ProductivityCommunication & messaging

Outdated check70 ms13 / 22
Workday Calendar

Public holidays and business-day math (T+N, counts) for many countries; pay per call via x402

ProductivityPayments & trading

Outdated check77 ms13 / 22
TrackerHacker

Spreadsheets that fill themselves from your emails and webhooks, the same way every time.

ProductivityFile & docs

Outdated check84 ms13 / 22
Destava job search

Search current job postings from companies' own career sites. Free, no account.

ProductivityData access / search

Outdated check84 ms13 / 22
Avenbridge

Hosted MCP knowledge base: businesses forward emails and docs; buyers query them over MCP.

ProductivityKnowledge & memory

Outdated check84 ms13 / 22
data-cleanup: fix a messy CSV before you load it

Fix messy CSVs in one call: trim, ISO dates, normalize emails/phones, flag dupes. x402 $0.005, Base

ProductivityCommunication & messaging

Outdated check85 ms13 / 22
Droppy docs

Search and read the Droppy for Mac handbook, droplets, DroppyKit SDK and release notes.

ProductivityData access / search

Outdated check87 ms13 / 22
HuntBoard

Search real, recent job postings from company career pages and ATS boards, scored for fit.

ProductivityData access / search

Outdated check88 ms13 / 22
Macro Index

Neutral, cited central-bank rate decisions, calendars, inflation releases and bond auctions.

ProductivityFile & docs

Outdated check90 ms13 / 22
humans fix ai

Ask a real, manually approved developer for help. Nothing is sent until you confirm by email.

ProductivityCommunication & messaging

Outdated check90 ms13 / 22
hovhannes.io

Yerevan Product Coffee: table dates, remaining seats, seat requests, and the field notes behind it.

ProductivityFile & docs

Outdated check91 ms13 / 22
Digital Garden by Alicia — Notes

Search and read Alicia's English and Chinese notes on Houdini, Three.js, OpenUSD and AI workflows.

ProductivityAutomation & workflows

Outdated check92 ms13 / 22
InboxGuards Email Check

Check emails before you send, and get a $1 SPF/DKIM/DMARC fix plan for your domain. Pay per call.

ProductivityCommunication & messaging

Outdated check100 ms13 / 22
Agent Email List — Free SMTP Relay for AI Agents

Free transactional email + SMTP relay. Agents self-signup, no API key needed to start.

ProductivityCommunication & messaging

Outdated check107 ms13 / 22
Release Notes Index

Release notes and changelogs from across the web, indexed for agents. Also via CLI and REST API.

ProductivityCode & DevOps

Outdated check108 ms13 / 22
Jiaheniao Tibetan Calendar

Reviewed Tibetan dates, festivals and day mechanisms for 2026–2027.

ProductivityFile & docs

Outdated check109 ms13 / 22

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