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
DrawKind Secret Santa

Draw names for Secret Santa without sign-ups or email addresses.

Developer ToolsCommunication & messaging

Outdated check113 ms12 / 22
agentsvc.io

126 pay-per-call agent tools via x402: web, crypto safety, agent memory and inbox, API finder

Finance & CryptoCommunication & messaging

Outdated check116 ms12 / 22
CortexPlus

Personal memory layer: files, notes, messages, tasks and email, semantically indexed.

ProductivityCommunication & messaging

Outdated check122 ms12 / 22
Regex/Email/URL Validator

Regex matching, email/URL format validation, and JSON Schema validation.

Developer ToolsCommunication & messaging

Outdated check129 ms12 / 22
com.infobip/mcp

Infobip MCP server for omnichannel communication and messaging. SMS, RCS, WhatsApp, Viber and more.

ProductivityCommunication & messaging

Responded130 ms12 / 22
Studio Natali – hair salon booking (Říčany, CZ)

Book a haircut with Vilma Strakatá, Studio Natali Říčany (CZ): prices, free times, SMS-verified.

ProductivityCommunication & messaging

Outdated check133 ms12 / 22
Context Link

One semantic search across your sites, Drive, Notion, email, files and Basecamp.

ProductivityCommunication & messaging

Outdated check168 ms12 / 22
Free Small Biz Tools

Free quote and late-fee calculators, paid reminder emails and a $1 small-business tool stack report.

ProductivityCommunication & messaging

Outdated check189 ms12 / 22
ReminderIt

Schedule real phone-call reminders with WhatsApp follow-up — medication, wake-ups, family check-ins.

ProductivityCommunication & messaging

Outdated check212 ms12 / 22
Heffl Free Tools

Free email verification, business calculators, UAE estimates and drafts. No API key.

ProductivityCommunication & messaging

Outdated check218 ms12 / 22
SignaMail

Email signatures for French businesses: HTML generator, legal mentions per job, SPF/DKIM/DMARC

LegalCommunication & messaging

Outdated check225 ms12 / 22
com.jojapi/whatsapp-wyjbao

WhatsApp: The WhatsApp Profile Data API lets you programmatically fetch a user’s profile picture.

OtherCommunication & messaging

Responded227 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

Responded242 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

Responded252 ms12 / 22
com.machineinbox/machine-inbox

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

ProductivityCommunication & messaging

Responded254 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
Qualisend Email Verification

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

ProductivityCommunication & messaging

Outdated check281 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

Responded321 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
Tendeck: AI-run real estate CRM + broker recruiting

Free AI-run real estate CRM. Brokers: Florida recruiting lists, County Watch, auto email, BYO MLS.

Real Estate & PropertyCommunication & messaging

Outdated check325 ms12 / 22
Aya scam check

Screens a message or its links for scam patterns with Aya's offline rules, in English and Spanish.

OtherCommunication & messaging

Outdated check344 ms12 / 22
DeepSearch

Research a person's public footprint from a name, phone, email, or username. Sourced.

ProductivityCommunication & messaging

Outdated check354 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
io.github.zkarimi22/agentaddress

Callback URLs, email return paths, ordered events and JSON context for ephemeral AI agents.

Developer ToolsCommunication & messaging

Outdated check360 ms12 / 22

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