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.

Connect your agent

40673 servers

Ordered by checks passed
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
smry Public Reader

Read and search exact public source URLs with stable paragraph citations.

Developer ToolsCode & DevOps

Responded65 ms15 / 22
ThawDay

Turkey thaw, roast, and food-safety timelines calculated for your bird's weight and dates.

OtherOther

Responded65 ms15 / 22
The Bitcoin Rainbow

Explains the Bitcoin rainbow valuation chart and where price sits in the cycle today.

Finance & CryptoPayments & trading

Responded65 ms15 / 22
HORIZON SHIELD YAKUMO (verified contractor directory)

Neutral, verification-gated MCP directory of Japan construction contractors (KIRA-audited).

Developer ToolsCode & DevOps

Responded66 ms15 / 22
x402 Checker (AI Nock)

Free check/board/name; paid bid/report 0.05, 1c fx/wx/lookups, news 0.001.

Developer ToolsCode & DevOps

Responded66 ms15 / 22
Guard Brasil

Detecta e mascara dado pessoal brasileiro (CPF, CNPJ, RG, e-mail) antes do texto ir a uma IA. LGPD.

Developer ToolsCode & DevOps

Responded66 ms15 / 22
pkgxray

Pre-install security scans for npm packages, MCP servers, and AI agents with cited verdict evidence.

Developer ToolsCode & DevOps

Responded66 ms15 / 22
Hatch

Hosting for AI agents: publish a live website in one tool call, ephemeral or forever.

Developer ToolsCode & DevOps

Responded66 ms15 / 22
OboeLib — Conservatory Oboe Fingering, Half-Hole, Forked F & Trill Chart Engine

Look up Conservatory oboe fingerings, half-hole, left/forked F rules, octave keys & trills.

Developer ToolsData access / search

Responded66 ms15 / 22
CheckChinaTransit — China 24/240-Hour Visa-Free Transit Compliance Engine

Verify China 240-hour (formerly 144h) visa-free transit eligibility, ports & third-country routes.

Developer ToolsCode & DevOps

Responded66 ms15 / 22
Tabularium

Agent memory and a signed spending ledger: pay any x402 API, keep a provable receipt.

Finance & CryptoCode & DevOps

Responded67 ms15 / 22
Qiniso

Deterministic fact verification for AI agents — checksums & curated data, not guesses.

Developer ToolsCode & DevOps

Responded67 ms15 / 22
Juicy Designs Quote

Free digital marketing quote and strategy requests from Juicy Designs SA. No price returned.

Marketing & SalesCode & DevOps

Responded67 ms15 / 22
Company Facts

Company data from official sources, plus a finder for the best paid x402 API for any task.

Finance & CryptoPayments & trading

Responded67 ms15 / 22
Faxwell

Fax any US or Canada number, as low as 6¢ a page. No subscription, no account needed first.

OtherPayments & trading

Responded67 ms15 / 22
IoMarkets Topup (demo)

Demo only, payments switched off. Travel eSIMs and mobile top-ups priced in USDC via x402.

Finance & CryptoPayments & trading

Responded67 ms15 / 22
InferIndex

LLM API prices across 70+ providers: cheapest offer, comparisons, history and cost estimates.

Developer ToolsCode & DevOps

Responded68 ms15 / 22
Electronic Compliance Objects (49 markets)

Each market's disclosure regime as one sourced, signed object, with the issuer's ACM-68000 signal.

Developer ToolsCode & DevOps

Responded68 ms15 / 22
Address Poisoning Check

Before sending crypto, check the recipient for address poisoning: lookalikes and bad checksums

Finance & CryptoCode & DevOps

Responded68 ms15 / 22
AuthiChain

Verification of signed records, plus an EU DPP check.

OtherOther

Responded68 ms15 / 22
Receipts Index

Free index and sample of dated AI-engine answer rows; prices for paid x402 rows. Never pays.

Developer ToolsCode & DevOps

Responded69 ms15 / 22
TweetFeed

IOCs (URLs, domains, IPs, hashes) shared by the infosec community on X/Twitter. No auth, CC0.

SecurityCode & DevOps

Responded69 ms15 / 22
OTInstaller Registry

Read-only search of the OTInstaller registry of OSINT tools and guides, with consent classes.

OtherData access / search

Responded69 ms15 / 22
Clearline Family

Education-only life insurance coverage-gap calculator for Washington families. Math shown.

EducationKnowledge & memory

Responded69 ms15 / 22

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