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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3337 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
tech.distribution/distribution

Priced X creators, campaigns from a goal, plan changes, mandated payment links, proof and results.

Finance & CryptoPayments & trading

Outdated check572 ms13 / 22
Grove Hopper Property Tax Check

Check any US address for property tax over-assessment: value, appeal deadline, exemptions. No login.

Finance & CryptoPayments & trading

Responded574 ms13 / 22
Mifori CertAgent Trust Oracle

Live AI agent trust oracle: audit synthetic IQ, latency & JSON compliance via x402 or free tokens.

Developer ToolsCode & DevOps

Responded579 ms13 / 22
SCRIPTMASTERLABS — Calibration Court

Calibration leaderboard + paid recalibration via x402. Settle-proven 2026-11-02 (SELF-PROOF).

LegalPayments & trading

Responded582 ms13 / 22
FaxFair

Fax API and MCP server for AI agents. Fax US and Canada, pay per request with x402. No account.

Developer ToolsCode & DevOps

Outdated check582 ms13 / 22
Context Window Supply

Browse merch for AI builders, get US shipping quotes, and create Stripe checkout links.

Finance & CryptoPayments & trading

Responded584 ms13 / 22
Mooncatcher Wire

Free crypto news for agents: top stories by market impact, search, topics, AI digest.

Finance & CryptoData access / search

Responded587 ms13 / 22
Realask - verified answers from the physical world

Ask a US local business a current question by phone. Typed, timestamped answers for agents; x402.

Developer ToolsCode & DevOps

Outdated check587 ms13 / 22
com.scriptmasterlabs/agent-browser

Chromium browser agents pay per action via x402 — USDC on Base, USDC on Solana, or XRP on XRPL.

Finance & CryptoPayments & trading

Outdated check587 ms13 / 22
PlanVoyager

Compare ACA health plans by real yearly cost, with tax credits, doctors and drugs, from CMS data.

Developer ToolsCode & DevOps

Responded588 ms13 / 22
Alder Invoices

Free invoice drafts, templates and direct PDF generation for AI agents. No account needed.

Finance & CryptoPayments & trading

Responded594 ms13 / 22
AIXBT

Crypto market intelligence for Projects, Topics, Intel, Reports, and Clusters.

Finance & CryptoCode & DevOps

Responded595 ms13 / 22
Fatstack

Paid MCP tools behind one endpoint. Agents pay per call in USDC on Base via x402.

Finance & CryptoPayments & trading

Responded595 ms13 / 22
Agent Desk API (deskfeed.dev)

Crypto market context, BSC alerts & token verdicts for agents. x402 on Base.

Finance & CryptoPayments & trading

Responded596 ms13 / 22
Riley Craig x402 Agent Store

AI brand/token visibility, prediction-market odds & cheap x402 data feeds for AI agents.

Developer ToolsCode & DevOps

Outdated check601 ms13 / 22
MLAIEL public collaboration

Public AI collaboration discovery and scoped, moderated agent contributions. No payments.

Finance & CryptoPayments & trading

Responded602 ms13 / 22
ARC (arcreport.ai): can an agent reach checkout?

Free open check: can an AI agent reach checkout on this store? Advisory; ARC stops before payment.

Finance & CryptoPayments & trading

Responded603 ms13 / 22
Limitless

Solana market data, mainnet bonding-curve quotes and unsigned buy/sell transactions. No wallet keys.

Finance & CryptoData access / search

Responded604 ms13 / 22
Reddit data for agents

15 Reddit endpoints. Pay per call in USDC via x402.

Finance & CryptoPayments & trading

Responded609 ms13 / 22
Tenjin

Search, read & publish paid essays. Pay-per-read in USDC on Base (x402); wallet-only, no account.

Finance & CryptoPayments & trading

Responded621 ms13 / 22
NetNest Design Fundamentals API

SEC company fundamentals and filing events, each with its source filing. Pay per call with x402.

Finance & CryptoPayments & trading

Responded622 ms13 / 22
io.github.AgentTanuki/agent-guild

Rank agents; signed machine messages + wallet gates via x402; free verifiable agent passports.

Finance & CryptoPayments & trading

Responded626 ms13 / 22
x402 Email Verifier

Email verification for AI agents: syntax, MX, disposable, role, score. $0.001 USDC/call via x402.

Finance & CryptoPayments & trading

Responded628 ms13 / 22
First Dollar Test

Base wallet-agent beta: deposit 1 USDC; PASS returns 1 USDC; terminal failure is refunded.

Finance & CryptoPayments & trading

Responded629 ms13 / 22

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