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
Odile answering lines

A phone line for your app or business that answers calls, takes messages and bookings.

OtherCommunication & messaging

Responded677 ms15 / 22
Signal by StackEnhance

How often 13,000+ e-commerce brands send marketing emails: counts, send dates, recent subject lines.

E-commerceCommunication & messaging

Responded678 ms15 / 22
getwowlink

Check link previews (Open Graph, Twitter cards) on X, LinkedIn, Slack; OG images per page.

MediaCommunication & messaging

Responded699 ms15 / 22
Faxbeep

Test fax numbers for AI agents. Send a test fax or scan-to-email, then read what Faxbeep received.

ProductivityCommunication & messaging

Responded730 ms15 / 22
HiddenSwap

No-KYC crypto swaps, no account or email. Read-only quotes, coins, swap links, order status.

Finance & CryptoCommunication & messaging

Responded763 ms15 / 22
Ichimoku Signal

Free Ichimoku trend; paid signals, levels, scan, setups and Telegram signal alerts via x402.

Developer ToolsCommunication & messaging

Responded803 ms15 / 22
ProSignature email signatures

Email signatures for Gmail, Workspace, Outlook: design 3-4, free HTML, prices, install steps.

ProductivityCommunication & messaging

Responded870 ms15 / 22
Agent Inbox — direct agent-to-agent messaging with receipts

Free agent-to-agent inbox: send, claim, ack. Be born in one signed call, no signup.

ProductivityCommunication & messaging

Responded982 ms15 / 22
Smarter Weather

Smarter Weather MCP: forecasts, alerts, outlooks, observations, AQI, grids, and map imagery.

Developer ToolsCommunication & messaging

Responded1010 ms15 / 22
TradeGraph

An export sales team for consumer brands, inside your AI: markets, buyers, emails and pricing.

ProductivityCommunication & messaging

Responded1607 ms15 / 22
BlackVeil DNS & Email Security Scanner

DNS and email security scanner with 82 MCP tools for SPF, DMARC, DNSSEC, SSL, and brand audits.

ProductivityCommunication & messaging

Responded1718 ms15 / 22
TamingDNS

Check SPF, DKIM, DMARC, MX, MTA-STS, TLS-RPT, BIMI, DANE and DNSSEC, and analyse email headers.

ProductivityCommunication & messaging

Responded6094 ms15 / 22
Voodoo SMS MCP by usefulapi

Read Voodoo SMS credits, reports, inbox and lists; send one SMS; manage the opt-out blacklist.

ProductivityCommunication & messaging

Outdated check51 ms14 / 22
Formspark MCP by usefulapi

List forms and submissions, and create or update forms and their notifications in Formspark.

Developer ToolsCommunication & messaging

Outdated check51 ms14 / 22
Spryng MCP by usefulapi

Check credits, read sent messages, send or cancel scheduled SMS in Spryng.

ProductivityCommunication & messaging

Outdated check52 ms14 / 22
NeverBounce MCP by usefulapi

MCP server for NeverBounce — business email verification, credits and bulk jobs.

ProductivityCommunication & messaging

Outdated check52 ms14 / 22
Missive MCP by usefulapi

Read email/chat conversations, messages, contacts and teams; draft, send and update threads.

ProductivityCommunication & messaging

Outdated check52 ms14 / 22
Notifyre MCP by usefulapi

Read Notifyre SMS, replies, faxes, numbers, prices and contacts; send SMS to up to 10 numbers.

ProductivityCommunication & messaging

Outdated check53 ms14 / 22
Messente MCP by usefulapi

Read Messente balance, prices, delivery status and statistics; send SMS to up to 10 numbers.

Data & AnalyticsCommunication & messaging

Outdated check54 ms14 / 22
Nylas MCP by usefulapi

MCP server for Nylas — read email, calendars, events and contacts, and send email or create events.

ProductivityCommunication & messaging

Outdated check55 ms14 / 22
FireText MCP by usefulapi

Read FireText credit, messages and reports; send an SMS to up to 10 numbers; manage opt-outs.

ProductivityCommunication & messaging

Outdated check55 ms14 / 22
Trumpia MCP by usefulapi

Read Trumpia lists, subscribers, keywords and reports; add contacts and send SMS or email campaigns.

ProductivityCommunication & messaging

Outdated check56 ms14 / 22
smsmode MCP by usefulapi

Read smsmode balance, messages, replies, campaigns and usage; send SMS to up to 10 numbers.

Marketing & SalesCommunication & messaging

Outdated check57 ms14 / 22
SendGrid MCP by usefulapi

Send email and read templates, marketing contacts, lists, stats, bounces and unsubscribes.

Marketing & SalesCommunication & messaging

Outdated check57 ms14 / 22

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