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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1557 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
Ariel Adler: branding, websites & systems (Israel)

Read about Ariel Adler (Israeli brand designer) and book an intro meeting with him.

ProductivityFile & docs

Outdated check216 ms12 / 22
ai.kaiv/email-check

Email posture for any domain: can it receive mail, can it be spoofed? MX, SPF and DMARC.

ProductivityCommunication & messaging

Outdated check242 ms12 / 22
getwork.dev

Search developer jobs read straight from employers' hiring systems: stack, level, remote, salary.

ProductivityData access / search

Outdated check246 ms12 / 22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Outdated check252 ms12 / 22
com.machineinbox/machine-inbox

Task-scoped email inboxes for AI agents: read mail, extract verification codes, and reply.

ProductivityCommunication & messaging

Outdated check254 ms12 / 22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Outdated check266 ms12 / 22
MailFerret

Find and verify work emails with live SMTP checks and catch-all detection. Free 10 calls/day.

ProductivityCommunication & messaging

Responded267 ms12 / 22
Qualisend Email Verification

Verify email addresses and clean lists to improve deliverability and sender reputation.

ProductivityCommunication & messaging

Outdated check281 ms12 / 22
Torah Library

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

ProductivityFile & docs

Outdated check298 ms12 / 22
com.jojapi/sms-verify

SMS Verify: SMS Verify API is a secure and easy-to-integrate service that sends verification codes.

ProductivityCommunication & messaging

Outdated check321 ms12 / 22
GetCourier

Email for AI agents: inbox in one call, no signup; codes, links, reply, send; own domains.

ProductivityCommunication & messaging

Outdated check321 ms12 / 22
ai.skillsinput/mcp

AI-powered career tools: job search, skills intelligence, career roadmaps, and resume building.

ProductivityData access / search

Outdated check324 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
Rafe Blandford — career and writing

Rafe Blandford's published career, case studies and writing. Read-only; no route to contact him.

ProductivityFile & docs

Outdated check341 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
Rung public career guides

Find public career guides, explore grounded occupations, and open Rung for private resume work.

ProductivityFile & docs

Outdated check375 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
ClickPhone

Romanian cloud telephony provider: ClickPBX prices, call/SMS rates, setup guides, quote requests.

ProductivityCommunication & messaging

Outdated check413 ms12 / 22
MailByGet

Temporary receive-only email inboxes for agents. Create, list and read messages without signup.

ProductivityCommunication & messaging

Outdated check415 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
dev.emailiq/email-intelligence

Email intelligence MCP: MX/SPF/DKIM/DMARC, score, enrichment. x402 on emailiq.dev/mcp.

ProductivityCommunication & messaging

Outdated check482 ms12 / 22
Nodehour: GPU capacity sized from your run and quoted by providers

GPU cluster sourcing: describe the run, get a sized requirement, quotes compared by email

ProductivityCommunication & messaging

Responded489 ms12 / 22
Nestproof: Graded pattern files your LA factory signs off before the cut

Graded pattern-file transfer to LA factories, with factory sign-off checks; terms by email

ProductivityCommunication & messaging

Responded490 ms12 / 22

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