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
Sarbacane MCP by usefulapi

Read Sarbacane campaigns, stats, lists and blacklists; manage contacts and draft email campaigns.

Marketing & SalesCommunication & messaging

Outdated check57 ms14 / 22
Salsa Engage MCP by usefulapi

Search supporters, donations, emails and segments; create or update supporters in Salsa Engage.

ProductivityCommunication & messaging

Outdated check57 ms14 / 22
Loops MCP by usefulapi

Manage Loops contacts, mailing lists, and transactional/event emails.

ProductivityCommunication & messaging

Outdated check58 ms14 / 22
Emma MCP by usefulapi

Read audiences, groups, mailings and campaign results without sending email or changing contacts.

Marketing & SalesCommunication & messaging

Outdated check59 ms14 / 22
WaiverFile MCP by usefulapi

Read WaiverFile waivers, events, forms and SMS opt-ins; create and update events, invite managers.

ProductivityCommunication & messaging

Outdated check60 ms14 / 22
Telegram MCP by usefulapi

Read chats and members; send, edit and delete messages with a bot in Telegram.

Developer ToolsCommunication & messaging

Outdated check60 ms14 / 22
Customer.io MCP by usefulapi

Query people, segments, campaigns, and message deliveries; send transactional email or broadcasts.

Marketing & SalesCommunication & messaging

Outdated check60 ms14 / 22
Emailable MCP by usefulapi

Verify email addresses with Emailable one by one or in batches, and read credits and batch results.

ProductivityCommunication & messaging

Outdated check62 ms14 / 22
SecLens.ONE Email Security

Assess any domain's email security across SPF, DMARC, DKIM, MTA-STS, DNSSEC, DANE, and TLS-RPT.

ProductivityCommunication & messaging

Outdated check63 ms14 / 22
Telzio MCP by usefulapi

Read calls, queues and users; hang up or transfer live calls and send SMS in Telzio.

ProductivityCommunication & messaging

Outdated check63 ms14 / 22
Spruce Health MCP by usefulapi

Read Spruce Health contacts, conversations, messages, phone lines and team members (read-only).

OtherCommunication & messaging

Outdated check63 ms14 / 22
Placetel MCP by usefulapi

Read Placetel calls, recordings, numbers and routing; edit contacts, start calls, send SMS.

ProductivityCommunication & messaging

Outdated check63 ms14 / 22
Temp Stick MCP by usefulapi

Read temperature and humidity sensors, their readings and alert notifications in Temp Stick.

Developer ToolsCommunication & messaging

Outdated check67 ms14 / 22
B2B Email & Domain Scorer

Lead email decisions: keep / fix typo / review / drop, plus a ready-to-send list. Paid: RapidAPI

ProductivityCommunication & messaging

Responded68 ms14 / 22
Zadarma MCP by usefulapi

Read balance, tariffs, SIP and PBX status and call logs; send SMS in Zadarma.

ProductivityCommunication & messaging

Outdated check68 ms14 / 22
Giftbit MCP by usefulapi

Browse reward brands, order and cancel rewards, resend emails and check balances in Giftbit.

ProductivityCommunication & messaging

Outdated check68 ms14 / 22
Helpwise MCP by usefulapi

Read Helpwise conversations, contacts, tags and reports; note, tag, assign, close; send one email.

ProductivityCommunication & messaging

Outdated check82 ms14 / 22
com.skipshit/mcp

People and property search for Claude and ChatGPT. Phones, emails, addresses, relatives, properties.

ProductivityCommunication & messaging

Outdated check88 ms14 / 22
Potarix Enricher

Find company websites and verified business emails through the Potarix Enricher API.

Developer ToolsCommunication & messaging

Responded96 ms14 / 22
Openhook

Private channels for people and their AI agents.

Developer ToolsCommunication & messaging

Responded98 ms14 / 22
openradar

Open base of job vacancies and freelance orders from Russian and international boards and Telegram.

Developer ToolsCommunication & messaging

Responded99 ms14 / 22
io.github.fnobbe/crashtestyourstrategy

Portfolio and strategy stress diagnostics with hedge-break detection and regime outlook. Free tier.

Developer ToolsCommunication & messaging

Outdated check125 ms14 / 22
RegEvidenceHub CQC

RegEvidenceHub CQC: England provider-registration and statutory-notification preflight.

Developer ToolsCommunication & messaging

Responded129 ms14 / 22
Groove MCP by usefulapi

Read Groove shared-inbox conversations, contacts, agents and tags; close, assign, snooze and tag.

ProductivityCommunication & messaging

Outdated check130 ms14 / 22

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