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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1497 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
MCP security checks — WARDEN and HISTOR

Scan MCP tool definitions for poisoning, look up server history, count tool-list tokens. Free.

Developer ToolsData access / search

Responded327 ms15 / 22
VulKill Security

Autonomous AppSec & DAST scanner across 12 security domains (260+ controls) with 3-Layer Triage.

Developer ToolsCode & DevOps

Responded346 ms15 / 22
MiniURL

OAuth 2.1 short-link tools for AI agents with scoped tokens, approvals, audit logs, and revocation.

Developer ToolsCode & DevOps

Outdated check427 ms15 / 22
PropFácil

Search authorized real estate in Mexico and manage favorites and publishing with OAuth.

Real Estate & PropertyCode & DevOps

Responded438 ms15 / 22
Aegis Security Skills

Read-only library of 24 defensive cybersecurity skills: ATT&CK, ATLAS, DFIR, CTEM and more.

SecurityCode & DevOps

Responded487 ms15 / 22
FMCSA Carrier Intelligence

US carrier vetting on FMCSA data: authority, insurance, safety, identity links. Pay per call (x402)

Developer ToolsCode & DevOps

Responded489 ms15 / 22
US compliance and books health

US company filing obligations, plus a 25-check bookkeeping diagnostic. Sourced, dated, no signup.

Finance & CryptoPayments & trading

Outdated check513 ms15 / 22
Signal Oracle

Pay-per-call change-intelligence feeds for AI agents over x402 (deps, security, regs, tariffs)

Developer ToolsCode & DevOps

Responded548 ms15 / 22
SendIt

Publish and schedule social posts, upload media, and review analytics through OAuth.

Developer ToolsCode & DevOps

Responded558 ms15 / 22
GribStream Weather MCP

NOAA and ECMWF weather forecast MCP for discovery, validation, and GribStream OAuth queries.

Data & AnalyticsData access / search

Outdated check565 ms15 / 22
Tektolo Rental Property

Rental property tools for agents: turnover cost estimates and security deposit rules by US state.

Real Estate & PropertyData access / search

Outdated check573 ms15 / 22
GameFork MCP

Publish, fork, improve browser games. No-auth reads; OAuth to post. Wheel: verified ops knowledge.

OtherOther

Outdated check581 ms15 / 22
SavingsLast retirement calculators

Retirement drawdown, 72(t) SEPP, RMD, Roth conversion, Social Security and state-tax calculators.

Finance & CryptoPayments & trading

Outdated check603 ms15 / 22
Compliance Check

Preview a TCPA/GDPR/CASL/10DLC gate result before spending a paid send. No key needed.

LegalKnowledge & memory

Responded623 ms15 / 22
ProductClank

Boost posts and launch community growth campaigns from your AI assistant. OAuth, credit-billed.

Marketing & SalesData access / search

Outdated check634 ms15 / 22
SignalTender B2B, GovCon & LegalTech MCP Server

B2B, GovCon & LegalTech MCP server for live RFPs, contract parsing, compliance & proposal tools.

LegalCode & DevOps

Outdated check642 ms15 / 22
Moltline Code Review

Risk-scan a diff, flag AI-generated-code tells, find secrets. 5 of 7 tools need no account.

OtherOther

Outdated check678 ms15 / 22
ViewportWitness by Apex Labs

Agent website testing: browser QA, visual regression, Markdown extraction, and security checks.

Developer ToolsFile & docs

Outdated check734 ms15 / 22
GuardLayer

Security checks for Next.js + Supabase apps: code scan, read-only live DB check, fix confirmation.

Developer ToolsDatabase

Responded771 ms15 / 22
GoSQLX

SQL validation, formatting, parsing, metadata extraction, linting, and security analysis.

Developer ToolsCode & DevOps

Outdated check795 ms15 / 22
x402 Micropayments MCP

Pay-per-call US city property compliance and Base tx checks, paid in USDC on Base via x402.

Finance & CryptoPayments & trading

Responded894 ms15 / 22
EchelonGraph CVE & Exposure

CVE, KEV, EPSS, SBOM and advisory lookups; per-CVE exposure from Shodan data (© Shodan). Keyless.

SecurityData access / search

Outdated check928 ms15 / 22
Mnemom — Trust Ratings for AI Agents

Trust infrastructure for AI agents: read a verifiable Trust Rating, claim an identity, earn a badge.

Developer ToolsCode & DevOps

Responded959 ms15 / 22
Wraps

Search the Wraps docs and estimate AWS SES costs. Public, read-only, no authentication.

OtherData access / search

Outdated check1007 ms15 / 22

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