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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2917 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
SukukFi

Live vault metrics and docs for SukukFi, Islamic trade finance on Berachain. Read-only.

Data & AnalyticsData access / search

Responded209 ms12 / 22
Siima eSIM

Search travel eSIM plans for 150+ countries and buy via Stripe link; eSIM QR delivered by email.

Finance & CryptoPayments & trading

Outdated check217 ms12 / 22
toolvend - utility APIs for agents

Calendar, DNS, RDAP, LEI, URLs, scraping, text, VAT and QR utilities. Pay-per-call USDC.

ProductivityPayments & trading

Responded236 ms12 / 22
com.preesy/preesy

Print at a print shop with a short label instead of email or USB. Files expire on their own.

ProductivityCommunication & messaging

Outdated check252 ms12 / 22
droid.monster — specs

Specs of commercially available robots, each figure citing its source document.

OtherFile & docs

Outdated check252 ms12 / 22
Docfarm

Publish, edit, share and track HTML docs and decks from chat, with view analytics.

Developer ToolsCode & DevOps

Outdated check263 ms12 / 22
gecici.email - Temporary Email for QA

Temporary inboxes for authorized QA, with token-protected message, code and link reading.

ProductivityCommunication & messaging

Outdated check266 ms12 / 22
Mammoth Docs

Search and read the Mammoth Analytics docs. Tools: search_docs, get_doc, list_docs.

Data & AnalyticsData access / search

Outdated check288 ms12 / 22
Torah Library

Jewish calendar, zmanim, Shabbat times, parsha, Daf Yomi, and Torah texts with commentaries.

ProductivityFile & docs

Outdated check298 ms12 / 22
AgentIndex x402

Jev-powered decisions, web search, PDF/web to Markdown, summarize. From $0.001, no API key.

Finance & CryptoData access / search

Responded300 ms12 / 22
AstroWay API Docs

AstroWay API documentation search and endpoint lookup with credit prices. No API key needed.

OtherData access / search

Outdated check320 ms12 / 22
io.github.hebcal/hebcal

Model Context Protocol extension for Hebrew calendar

Developer ToolsCode & DevOps

Outdated check338 ms12 / 22
The Market Calendar

Seasonality by month for 9 markets, S&P 500 day by day this month, and US economic release dates.

ProductivityFile & docs

Outdated check341 ms12 / 22
CPF Mortgage Home Values

U.S. home values, comparable sales, rent estimates, forecasts and PDF reports from CPF Mortgage.

Real Estate & PropertyCode & DevOps

Outdated check349 ms12 / 22
HostDirect hosting comparison

Compare Dutch hosting, email and cloud packages with price dates, source links and limitations.

ProductivityCommunication & messaging

Outdated check356 ms12 / 22
DiviMail

Give your AI agent its own email address: send, receive and read email. $0.01 USDC per send.

ProductivityCommunication & messaging

Outdated check379 ms12 / 22
now.shiply/shiply

Publish any app in one call: SQL database, functions, email, and a custom domain. Flat price.

Developer ToolsDatabase

Outdated check380 ms12 / 22
Agent Tools UK

Pay-per-use agent tools: screenshots, web to Markdown, PDF tables, OCR, UK company checks

Developer ToolsFile & docs

Outdated check383 ms12 / 22
Microsoft Learn MCP

Official Microsoft Learn MCP Server – real-time, trusted docs & code samples for AI and LLMs.

Developer ToolsCode & DevOps

Outdated check390 ms12 / 22
io.github.robertoyanguas-ops/arxiv-digest-mcp

Queries ArXiv for AI/CS/math papers and returns structured abstracts, authors, PDF links, and BibT

Developer ToolsCode & DevOps

Outdated check421 ms12 / 22
co.sickslip.www/verify

Verify a SickSlip doctor's note by Document ID; states served, pricing, physician NPI. Read-only.

HealthcareFile & docs

Responded423 ms12 / 22
Cognita

Passive OSINT and security recon: DNS, TLS, email posture, IP reputation, CVE/KEV, CT logs.

ProductivityCommunication & messaging

Outdated check434 ms12 / 22
EmailVerify by Techforce Global

Verify email addresses: syntax, MX, disposable, role, SMTP mailbox, catch-all and typo checks.

ProductivityCommunication & messaging

Outdated check449 ms12 / 22
Yank

Five sourced lines from a video, podcast, article or PDF, and a check that a quote is in its source

MediaFile & docs

Outdated check460 ms12 / 22

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