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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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
Slack Webhook Shape

Check a Slack webhook URL shape. Secret discarded.

Developer ToolsCommunication & messaging

Responded31 ms12 / 22
Discord Webhook Shape

Check a Discord webhook URL shape. Secret discarded.

Developer ToolsCommunication & messaging

Responded31 ms12 / 22
Responded33 ms12 / 22
Responded37 ms12 / 22
Responded42 ms12 / 22
Responded46 ms12 / 22
Responded59 ms12 / 22
Hyades

Render LaTeX math as pure Unicode text art for terminals, code comments, and emails.

Developer ToolsCommunication & messaging

Responded70 ms12 / 22
Apollo.io B2B Person Enrichment & Verified Email Finder (x402)

Apollo.io B2B Person Enrichment & Verified Work Email Finder via x402 on Base ($0.03, free on miss).

Developer ToolsCommunication & messaging

Responded458 ms12 / 22
SendaFax

Send a fax in Australia (+61). Pay only if it delivers. Email receipt. No card at send.

ProductivityCommunication & messaging

Outdated check515 ms12 / 22
Outdated check558 ms12 / 22
LetsBot

WhatsApp Business messaging, live chat, chatbots, campaigns and CRM for a LetsBot workspace.

Marketing & SalesCommunication & messaging

Outdated check2789 ms12 / 22
Ashraf Gents Hostel, Kalamassery

Men's hostel in Kalamassery, Kochi: facts, rates, local guides, nearby places, WhatsApp enquiry.

OtherCommunication & messaging

Outdated check50 ms11 / 22
echo.email Deliverability Test

Send a test email, get SPF, DKIM, DMARC, TLS and IPv6 results plus sender rules. No key.

ProductivityCommunication & messaging

Outdated check64 ms11 / 22
com.x402supply/pii-redact

Detects and redacts PII (emails, phones, SSNs, names, addresses) from text. $0.02/call via x402.

ProductivityCommunication & messaging

Responded68 ms11 / 22
Data Breach Notification Deadlines

Who to notify after a data breach and by what date: all US states, SEC, HIPAA, GDPR, UK. Sourced.

HealthcareCommunication & messaging

Outdated check76 ms11 / 22
Email DNS Preflight x402

Paid email, DNS, mail-security and RDAP intelligence for agents over x402.

Developer ToolsCommunication & messaging

Outdated check82 ms11 / 22
Magicalink by AgentTransmit

Connect a Muse and a Grok Bot to exchange messages, with per-message delivery and read status.

OtherCommunication & messaging

Responded87 ms11 / 22
de.flowboxx/agenten-tuer

flowboxx Agenten-Tür: ehrliche Antworten zu Websites, Software, KI, Telegram. Anfrage an Menschen.

OtherCommunication & messaging

Responded87 ms11 / 22
Professor Sausages — Trust & Verification

Email, phone, domain, URL & OFAC verification; phishing and IBAN checks via x402.

ProductivityCommunication & messaging

Outdated check88 ms11 / 22
HLWatch Hyperliquid Wallet Tracker

Live Hyperliquid wallet positions, recent trades with PnL, and fill alerts to Discord/Telegram.

Finance & CryptoCommunication & messaging

Outdated check98 ms11 / 22
agentic sinkhole research

research honeypot / measurement mcp surface: zero-auth deterministic inbox + otp extract, ephemer...

ProductivityCommunication & messaging

Outdated check138 ms11 / 22
tgboard — Telegram Directory

Search 100k+ auto-verified Telegram channels, bots and groups: full-text search and top rankings.

OtherCommunication & messaging

Outdated check192 ms11 / 22
MyShop - solutions for restaurants

Match a restaurant to a MyShop solution and send a real, signable $89/month quote by email.

Developer ToolsCommunication & messaging

Outdated check193 ms11 / 22

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