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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1052 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
io.github.machinegrade/validate

Deterministic validation for AI-generated artifacts: JSON Schema, OpenAPI response, SQL syntax.

Developer ToolsCode & DevOps

Outdated check95 ms13 / 22
SmartRetry Payment Tools

Free BIN, issuer, MCC and decline code lookups for card payments (Visa, Mastercard, Stripe, Adyen).

Finance & CryptoPayments & trading

Outdated check99 ms13 / 22
Code civil (France)

French Civil Code (LEGI) as executable rules: facts and a legal date in, answers with grounds out

LegalKnowledge & memory

Responded120 ms13 / 22
BGB (Germany)

German Civil Code (BGB) as executable rules: periods, deadlines and more, answered with grounds

OtherOther

Responded123 ms13 / 22
US Grow Zones

USDA hardiness zone, frost dates and vegetable planting calendar for any U.S. ZIP code.

ProductivityFile & docs

Outdated check127 ms13 / 22
opchain

Claude Code / MCP skills for the dev pipeline: discover, spec, design, build, ship, operate.

Developer ToolsCode & DevOps

Responded149 ms13 / 22
Medicare Fee Schedule Rates

Medicare Physician Fee Schedule amounts by code, date and locality, traced to archived CMS files.

HealthcareData access / search

Outdated check165 ms13 / 22
StarProof

GitHub repo authenticity scoring: stars-vs-forks, star velocity, astroturf fingerprints. Free API.

Developer ToolsCode & DevOps

Outdated check172 ms13 / 22
brief bar_

Free bar for digital product briefs: your model judges, open rules and code score it.

OtherOther

Responded187 ms13 / 22
TestLens

Paste code + tests, get a strong/weak verdict with killed/survived mutants. Free API + MCP.

Developer ToolsCode & DevOps

Outdated check187 ms13 / 22
iva.pt — EU VAT check (VIES) and Portuguese VAT law

Validate EU VAT numbers in VIES and read the Portuguese VAT Code and RITI in Portuguese or English.

LegalKnowledge & memory

Outdated check199 ms13 / 22
UnderHyper

Hyperliquid referral code, perp markets, funding rates, HIP-3 dexes and site search. Read-only.

Developer ToolsData access / search

Outdated check199 ms13 / 22
urlhub

Many links as one short link with a QR code; read urlhub sets and preview what links are about.

OtherOther

Outdated check205 ms13 / 22
AIStrategyMiner

Design trading strategies with your AI and open them in a visual no-code Strategy Builder.

Finance & CryptoPayments & trading

Outdated check207 ms13 / 22
Prince of Post

Print a Royal Mail QR code (Vinted, eBay, ASOS returns) as a 6x4 shipping label at home.

OtherOther

Outdated check216 ms13 / 22
Latitude 10 Agent Readiness

Scores how well AI agents will use your API, 0-100, from its OpenAPI spec. Free and read-only.

Developer ToolsCode & DevOps

Outdated check218 ms13 / 22
Upgrade Brief

Breaking changes between two versions: npm, PyPI, GitHub Actions, Helm, Terraform, crates.io, Go.

Developer ToolsCode & DevOps

Outdated check221 ms13 / 22
io.github.UnityNodes/blobpedia

Celestia knowledge base: CIPs, docs, forum, videos, GitHub, plus live on-chain state

Finance & CryptoKnowledge & memory

Outdated check264 ms13 / 22
Package Tracker by Spoke

Track a package from its tracking code and follow it on spokepackagetracker.com.

OtherOther

Outdated check272 ms13 / 22
quantakrypto pqc-tools

Scan code for quantum-vulnerable cryptography and get NIST post-quantum migration guidance.

Developer ToolsCode & DevOps

Responded314 ms13 / 22
io.github.greenmtnsun/wikimint

Generate wiki docs from source code. Supports PowerShell, Python, Go, C#, Java, COBOL.

Developer ToolsCode & DevOps

Responded324 ms13 / 22
FLOP Independent MCP V2

Bounded readonly SHA256 verification with the official MCP SDK. No code execution or model calls.

Developer ToolsCode & DevOps

Responded325 ms13 / 22
VibeDoctor

Lets coding agents check their own code for leaked secrets, risky dependencies and AI-code mistakes

Developer ToolsCode & DevOps

Outdated check329 ms13 / 22
Upstar

Rising GitHub repos per topic, ranked by star velocity, plus repos spotted early. Free, read-only.

Developer ToolsCode & DevOps

Outdated check336 ms13 / 22

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