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

4109 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
dev.charliemorrison/agent-web-reader

Pay-per-call data tools for AI agents: crypto signal, web reader, SEO audit. x402 USDC on Base.

Finance & CryptoPayments & trading

Responded464 ms13 / 22
dev.invoicehub/invoicehub

Validate, generate & convert EU e-invoices (UBL, CII, XRechnung, Factur-X) — EN 16931 pre-validated.

Finance & CryptoPayments & trading

Responded522 ms13 / 22
Tereno on Base

Check a Base contract, transaction or web page before you act. Free pricing, paid per call in USDC.

LegalPayments & trading

Responded529 ms13 / 22
SAID Protocol

Check a Solana wallet before you pay it, a token before you buy it. Agent identity and reputation.

Finance & CryptoPayments & trading

Responded530 ms13 / 22
dev.rendraputra/100pro-token-risk

Read-only risk tools: token screen, contract source, wallet. $0.10 USDC on Base.

Finance & CryptoPayments & trading

Responded955 ms13 / 22
dev.x402check/mcp

Preflight before paying any x402 tool (ok|caution|avoid + history). 1 free/wallet; then $0.01 Base.

Finance & CryptoPayments & trading

Responded60 ms13 / 22
Gear & Glam — Lifestyle, Beauty & Tech Accessories Store

Search lifestyle, beauty, and tech products with live stock checks and 1-click checkout.

Finance & CryptoPayments & trading

Responded66 ms13 / 22
NullClear Arbiter

Autonomous x402 payment schema-escrow arbiter, spend firewall, failover & ERC-8004 Sybil oracle

Finance & CryptoPayments & trading

Outdated check68 ms13 / 22
io.github.builtforai/part-d-cap

Medicare Part D out-of-pocket cap: when you hit it, and what the payment plan changes

Finance & CryptoPayments & trading

Responded83 ms13 / 22
bot-check: Bitcoin Self-Custody & WorkSats MCP

Verify Bitcoin PSBTs, addresses, and descriptors; earn or spend WorkSats bearer credits.

Finance & CryptoPayments & trading

Responded88 ms13 / 22
Agent Lead Generation

Leads from agents: hops attributed with a per-hop utm_id from discovery to trial to invoice.

Marketing & SalesPayments & trading

Outdated check99 ms13 / 22
Bitcoin PSBT, Address & Descriptor Verifier + WorkSats L402 MCP

Verify Bitcoin PSBTs, addresses, and BIP380 descriptors; earn or spend WorkSats L402 bearer credits.

Finance & CryptoPayments & trading

Responded100 ms13 / 22
Ens

ENS (Ethereum Name Service) MCP.

Finance & CryptoPayments & trading

Outdated check115 ms13 / 22
Outdated check128 ms13 / 22
Open Claw x402 Tools

Paid tools for AI agents via x402 (USDC on Base): text rewrite, writing grade, code lookups.

Finance & CryptoPayments & trading

Responded131 ms13 / 22
NTWX AAAS catalogue

Read-only parent catalogue of NTWX live surfaces. No checkout.

Finance & CryptoPayments & trading

Responded146 ms13 / 22
NTWX Studio catalogue

Read-only NTWX Studio catalogue for consumer agents. No checkout.

Finance & CryptoPayments & trading

Responded147 ms13 / 22
alalanet — check before your agent installs, connects or pays

Check packages, MCP servers and x402 endpoints before agents install, connect or pay. Signed.

Finance & CryptoPayments & trading

Outdated check226 ms13 / 22
TWVS — Industrial Valves & Engineering Supply Catalog

Query industrial valve specifications, pressure ratings, stock availability, and trade quotes.

Finance & CryptoPayments & trading

Responded251 ms13 / 22
SanctionsAI

OFAC sanctions screening for AI agents: 1,050 wallets, 19,389 SDN names, <100ms. Free tier, no key.

Finance & CryptoPayments & trading

Outdated check253 ms13 / 22
APEX EVM Reads

Agent reads, ETH/Base/Arc/BNB: prices, FX, sanctions, payment checks, balances, NFTs, gas, ENS.

Finance & CryptoPayments & trading

Responded296 ms13 / 22
Crypto Perp Funding Arbitrage Radar MCP

Hyperliquid, Binance & Bybit perpetual funding rate arbitrage & DeFi APY yield scanner MCP.

Finance & CryptoPayments & trading

Responded438 ms13 / 22
Base L2 Transaction Simulator & Wallet Drain Guard

Pre-execution Base eth_call/eth_estimateGas simulator & ERC-20 approve drain detector.

Finance & CryptoPayments & trading

Responded524 ms13 / 22
cc.accrue/mcp

Stablecoin Yield Index (SYX) and live USDC vault APYs across Ethereum, Base, Arbitrum.

Finance & CryptoPayments & trading

Responded542 ms13 / 22

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