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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3365 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
PaymentOracle — Verifiable Multi-Rail Payment Receipts

PaymentOracle — ES256K-signed receipts for x402 payments on USDC+EURC (Base) and XRP+RLUSD (XRPL).

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
PDF Generator API

Generate PDF from HTML or Markdown with custom pages, margins, layout. x402.

Developer ToolsFile & docs

Outdated checkNot measured4 / 22
Perpetual Funding Rates API

Perp funding rates across Binance, Bybit, OKX — open interest, sentiment. x402.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
Person Enrichment API

Person lookup from email: name, title, company, social profiles. x402.

Developer ToolsCommunication & messaging

Outdated checkNot measured4 / 22
Peru Payments (Mercado Pago — Yape / PagoEfectivo)

Peru payments for AI agents — Yape / PagoEfectivo via Mercado Pago. Never holds funds.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
Philippines Payments (PayMongo — GCash / Maya / cards)

Philippines payments for AI agents — GCash, Maya, cards via PayMongo. Never holds funds.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
Phone Number Validation API

Validate phone numbers worldwide: carrier, line type, country, E.164. x402.

Developer ToolsCode & DevOps

Outdated checkNot measured4 / 22
PII Detector API

Detect PII in text: emails, phones, SSNs, credit cards, IPs. Regex + Luhn. x402.

Developer ToolsCommunication & messaging

Outdated checkNot measured4 / 22
Poland Invoices (KSeF 2.0 national e-invoice API)

Poland KSeF 2.0 national e-invoices for AI agents: issue FA(3) faktura, query by KSeF number.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
Poland Payments (Stripe — BLIK)

Poland payments for AI agents — BLIK via Stripe. Never holds funds.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
Port Scanner API

TCP port scanning — check open ports on any host. x402 micropayment.

Developer ToolsCode & DevOps

Outdated checkNot measured4 / 22
Portugal Payments (Stripe — Multibanco)

Portugal payments for AI agents — Multibanco via Stripe. Never holds funds.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
Prediction Markets API

Prediction market odds from Polymarket. Active markets, probabilities, volume. x402.

Developer ToolsCode & DevOps

Outdated checkNot measured4 / 22
preflight402

Trust verdict for an x402 payment endpoint: health, 402 handshake, price, proceed/caution/avoid.

Finance & CryptoPayments & trading

UnreachableNot measured4 / 22
PressureDesk

Read-only BUY / WAIT / AVOID spend gate for paid APIs, MCP endpoints, and x402 routes.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
PutRoots

SF move agent: rentals with sources, no-SSN banking routes, and your move plan and drafts.

Finance & CryptoPayments & trading

UnreachableNot measured4 / 22
Qatar Payments (Tap Payments — cards / Apple Pay)

Qatar payments for AI agents — cards / Apple Pay via Tap Payments. Never holds funds.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
Qorevia Market Intelligence

Qorevia agent gateway for market intelligence, XAUUSD data and x402-payable tools.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
QR Code Generator API

Generate QR codes from text or URLs. Returns base64 PNG. x402 micropayment.

Developer ToolsCode & DevOps

Outdated checkNot measured4 / 22
rainmaker-gateway

Free list of Rainmaker tools + paid need-to-tool router. x402 $0.005 USDC, Base. As is, no warranty.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22
Regex Tester API

Test, validate and explain regular expressions with match highlighting. x402 micropayment.

Developer ToolsCode & DevOps

Outdated checkNot measured4 / 22
Research Report API

Multi-source research report generator with web fetching. x402 micropayment.

Developer ToolsCode & DevOps

Outdated checkNot measured4 / 22
ResolutionRelay API Search

Search millions of x402 APIs for data, finance, validation, security, inventory, sync and automation

Finance & CryptoAutomation & workflows

Outdated checkNot measured4 / 22
Romania Payments (Stripe — cards / Apple Pay)

Romania payments for AI agents — cards / Apple Pay via Stripe. Never holds funds.

Finance & CryptoPayments & trading

Outdated checkNot measured4 / 22

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