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

3330 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
Tommy Accounting

Free UK sole-trader tools: VAT & MTD checks, tax set-aside, expense categories, bookkeeper requests.

Finance & CryptoPayments & trading

Outdated check79 ms13 / 22
Agent Utils (x402)

Public records, OSV, PII redact, web reader, stablecoin freeze check for agents. x402 USDC

Finance & CryptoPayments & trading

Responded80 ms13 / 22
eurc402 — EU compliance (VAT + company data)

Free EU VAT (VIES) + pan-EU company data (10 registers), payable in EURC/USDC via x402.

Finance & CryptoPayments & trading

Responded80 ms13 / 22
io.github.DarthSander/agentdata-nl

x402-paid tools: EU company & sanctions data, web search, LLM chat, crypto intel, x402 monitoring.

Finance & CryptoData access / search

Outdated check80 ms13 / 22
Agent Deals

Pay less for x402 APIs: free pre-payment checks, cheapest working service finder, web/PDF reader.

Finance & CryptoPayments & trading

Responded81 ms13 / 22
work.dutiful/dutiful

Cited company background reports for agents from official registries. $3 per report via x402.

Finance & CryptoPayments & trading

Outdated check81 ms13 / 22
PulseWatch Vendor Status

Is this vendor down? Pay-per-call status for 1,700+ SaaS/cloud vendors from PulseWatch (x402 USDC).

Finance & CryptoPayments & trading

Outdated check81 ms13 / 22
app.surewhynot.quantum-artificer/quantum-artificer

Scientific compute for AI agents: symbolic, numerical, quantum, chemistry, ODE. Paid via x402.

Finance & CryptoPayments & trading

Responded82 ms13 / 22
Epics Deals — US LLC & Tax Tools

LLC costs, EIN timelines, IRS deadlines and filing prices for founders forming US companies.

Developer ToolsCode & DevOps

Responded83 ms13 / 22
x402 Bazaar Listing Monitor

Checks x402 Bazaar resource listings against the public discovery catalog and flags drops.

Finance & CryptoPayments & trading

Outdated check83 ms13 / 22
VerifyLite

Verify before you pay or act: site, transaction, token and injection checks for agents. x402 USDC.

Finance & CryptoPayments & trading

Responded85 ms13 / 22
QuietProof

29 deterministic read-only audits + free discovery tools; paid per call in USDC on Base via x402.

Finance & CryptoPayments & trading

Responded85 ms13 / 22
x402card: Virtual Cards + Freeland eSIM

Issue and top up x402 virtual cards or buy Freeland travel eSIMs with Base USDC.

Finance & CryptoPayments & trading

Responded86 ms13 / 22
Verifi

Get a real human to verify, decide, or improve an AI agent's work. Pay per review via x402 on Base.

Finance & CryptoPayments & trading

Outdated check86 ms13 / 22
klaro.legal Document Explainer

Explains contracts, letters and tax notices clause by clause. Text, PDF or photos. Not legal advice.

LegalFile & docs

Outdated check87 ms13 / 22
Zovo Sales Payout Summary

Make a Stripe monthly report, turn your PayPal transaction history into Excel.

Finance & CryptoPayments & trading

Responded88 ms13 / 22
PennyQuery

Company enrichment + SEC EDGAR filings, financials, insider trades for agents; $0.01 USDC via x402

Finance & CryptoPayments & trading

Responded88 ms13 / 22
chainpulse — real-time crypto + prediction market data for AI agents

Crypto prices, gas, DeFi TVL, and live Polymarket odds. x402 pay-per-call, $0.001, no API key.

Finance & CryptoData access / search

Responded88 ms13 / 22
sharescan: check before you share

Pre-share check: flags API keys, emails, your private terms in text. As is. x402 $0.005, Base

ProductivityCommunication & messaging

Responded88 ms13 / 22
Agent Verification Utility

Deterministic JSON checks with signed evidence and x402-paid execution

Finance & CryptoPayments & trading

Responded88 ms13 / 22
ProofCheck

Free x402 offer/receipt checker: verifies signatures and whether the signer fits the host.

Developer ToolsCode & DevOps

Responded88 ms13 / 22
UK Tourist Tax (Visitor Levy) Calculator

Works out UK tourist tax for a holiday let booking: Edinburgh, Glasgow, Cardiff and more. Free.

Developer ToolsCode & DevOps

Responded90 ms13 / 22
SCRIPTMASTERLABS — HIVE402

HIVE402 by ScriptMasterLabs: 132 paid x402 endpoints from $0.001/call, 10 MCP tools, no custody.

Finance & CryptoPayments & trading

Responded90 ms13 / 22
Ni Biashara Shelves — Africa FX, freight & compliance checks (x402)

Africa FX, US carrier/broker checks, OFAC name and wallet screens, load-vet pack. Paid via x402.

Finance & CryptoPayments & trading

Responded90 ms13 / 22

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