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
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
Safe or Scam

Crypto scam checks (tokens, sites, wallets), chain reads, web page to Markdown, email checks.

Finance & CryptoPayments & trading

Responded91 ms13 / 22
Colin Wynd (tarvit.com)

Colin Wynd's career, writing and talks on payments, settlement, digital assets and enterprise AI

Finance & CryptoPayments & trading

Responded94 ms13 / 22
PayperDecision

Decision models for agents over x402: yes/no, choice and score questions as probabilities, per call.

Finance & CryptoPayments & trading

Responded94 ms13 / 22
NSW Planning Data (x402)

NSW DAs, CDCs and property planning reports: zoning, height, FSR, nearby DAs. Pay per call via x402.

Real Estate & PropertyCode & DevOps

Responded95 ms13 / 22
Trust Check

Base crypto safety for agents: honeypot/tax test, address poisoning, rug feed, creator record.

Finance & CryptoCode & DevOps

Responded95 ms13 / 22
Bitcoin Power Law (btclaw.io)

Live Bitcoin power-law data: price vs trend, trend and bands on any date, when BTC reaches a price.

Finance & CryptoPayments & trading

Responded95 ms13 / 22
Eudigo – EUDI Wallet index

Independent EUDI Wallet index: status in all 27 EU states, deadlines, registers, standards, news.

Finance & CryptoPayments & trading

Responded95 ms13 / 22
io.github.tony8713/casa

Private, permanent encrypted storage for AI agents. Paid per call in USDC via x402.

Finance & CryptoPayments & trading

Responded95 ms13 / 22
H/M Agent Surface - Free MCP Tools

Five free MCP tools, including proof-before-payment preview, plus one authorized x402 pack.

Finance & CryptoPayments & trading

Outdated check95 ms13 / 22
x402 Agent Tools

Pay-per-call web, Base onchain and crypto-alert tools for agents. USDC on Base via x402, no API key.

Finance & CryptoPayments & trading

Responded97 ms13 / 22
MEO Preflight

Read-only machine payment preflight using dated MEO evidence, with explicit unknowns.

Finance & CryptoPayments & trading

Responded98 ms13 / 22
Datoka Agent

Signed agent execution declarations. Free verification; issuance 0.002 USDC via x402 on Base.

Finance & CryptoPayments & trading

Responded99 ms13 / 22
CoinPaprika

Real-time crypto market data: prices, tickers, exchanges, OHLCV candles, and metadata.

Finance & CryptoData access / search

Responded99 ms13 / 22
uk.co.hopi/hopi

Free UK calculators, converters and validators (tax, VAT, stamp duty, dates, units), read-only.

Finance & CryptoPayments & trading

Outdated check99 ms13 / 22
IranTools (paid)

Persian and Iranian utilities for agents plus text tooling. Paid via x402 or MPP.

Finance & CryptoPayments & trading

Outdated check100 ms13 / 22
PaidPilot Invoice Tools

Invoice tools: reminders, late fees, terms, timesheets and a receivables health report (x402).

Finance & CryptoPayments & trading

Responded102 ms13 / 22
HoldKit

Idempotency keys, locks, timers, and inboxes for agents over MCP. No payments.

Finance & CryptoPayments & trading

Responded104 ms13 / 22
Agent Toolbox

Everyday tools for AI agents, paid per call with x402: images, markdown, speech-to-text, embeddings.

MediaAI / LLM tooling

Responded105 ms13 / 22
PayperAnswer

Pay-per-call chat on GPT-6.1, Claude, Gemini and Grok over x402. No API key; a failed call is free.

Finance & CryptoAI / LLM tooling

Responded105 ms13 / 22
CrawlWitness

AI consent & licensing check for any domain, with signed on-chain receipts. Paid via x402.

Finance & CryptoPayments & trading

Responded107 ms13 / 22

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