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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3298 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
Fresh402 Agent Intelligence

Four web/API/Base workflows, 11 paid MCP/REST resources and free Register; x402/MPP/prepaid.

Developer ToolsCode & DevOps

Outdated check136 ms15 / 22
WebRead

Read any public web page as clean Markdown for LLMs. Respects robots.txt. Free tier; x402 paid API.

Developer ToolsFile & docs

Outdated check137 ms15 / 22
NEMO x402 Micro-Services

34 paid tools: site/SEO, weather, crypto+markets, podcasts, YouTube, Polymarket. x402/MPP/Stripe.

Finance & CryptoPayments & trading

Outdated check147 ms15 / 22
Crypto Derivatives Data API

Perp funding rates, open interest, futures basis, IV, liquidations, order books on 8 exchanges

Finance & CryptoPayments & trading

Outdated check155 ms15 / 22
SEO and Keyword Data API

SEO data: keyword volume, CPC, Trends, backlinks, domains, SERP, Maps, audits. Pay per call (x402)

Finance & CryptoData access / search

Outdated check157 ms15 / 22
SiteCheck

225 pay-per-call agent tools: Polymarket, chain reads, DeFi, web, SEC, KYB, geo, dev, AI. x402

Finance & CryptoCode & DevOps

Outdated check158 ms15 / 22
afro.tools

Open-source API specs for African providers (payments, SMS, KYC, delivery) for AI agents.

Finance & CryptoPayments & trading

Outdated check159 ms15 / 22
Bounty Engineer Agent Commerce

Remote MCP storefront for agent routing, verification, web extraction and x402-paid tools.

E-commerceCode & DevOps

Outdated check160 ms15 / 22
Business Frameworks

Operating judgement for businesses under $50M revenue. Free top layer; nodes and bundles over x402.

Developer ToolsCode & DevOps

Outdated check163 ms15 / 22
Social Media Data API

Social listening and mentions: posts, search, comments, profiles, 10 platforms. Pay per call (x402)

Marketing & SalesData access / search

Outdated check165 ms15 / 22
DecisionsCalc calculators

Official-rule calculators: retirement, home buying, tax, benefits, leave, FSA (US UK IE CA AU NZ).

Finance & CryptoPayments & trading

Outdated check172 ms15 / 22
Mirabello Immigration Intelligence

Citizenship, residency & tax-residency data for 190+ countries, with origin-aware route planning

Finance & CryptoPayments & trading

Outdated check176 ms15 / 22
RoundWatch

Durable Algorand USDC payment monitoring for autonomous workflows.

Finance & CryptoPayments & trading

Responded184 ms15 / 22
peptides.farm

Cited peptide monographs, trials, safety and FDA status as JSON. Pay per call in USDC via x402.

Finance & CryptoPayments & trading

Outdated check188 ms15 / 22
agenttool

Where agents arrive as themselves: DID identity, memory, wallet, inbox, covenants, jokes.

Finance & CryptoPayments & trading

Outdated check197 ms15 / 22
Agent Services (x402): compliance, company, procurement

27 pay-per-call agent tools (KYB, VAT, sanctions, tenders, data). Pays via x402; holds no funds.

Developer ToolsCode & DevOps

Outdated check203 ms15 / 22
Trading Zones 4H Market Decisions

BTC, ETH, XRP, ONDO and TZ SELECT 4H decisions, native x402 MCP and open buyer SDK.

Finance & CryptoPayments & trading

Outdated check203 ms15 / 22
Simvito eSIM

Compare travel eSIM plans and each local network (4G/5G), check phone support, get payment links.

Finance & CryptoPayments & trading

Outdated check207 ms15 / 22
Student Loan RAP Calculator

Student loan RAP payment calculator, 2026 federal loan limits, SAVE/PAYE/ICR end dates (OBBBA).

Finance & CryptoPayments & trading

Responded211 ms15 / 22
Countersignatory

Buy a verified human's approval, verification or judgment at a published price, paid by x402 or card

Finance & CryptoPayments & trading

Outdated check213 ms15 / 22
BridgeNode MCP

BridgeNode — x402 pay-per-request AI inference. OpenAI-compatible API + MCP, Solana USDC, gas-free.

Finance & CryptoPayments & trading

Outdated check221 ms15 / 22
Blocksize Agentic Market Intelligence

Multi-venue VWAP, bid/ask, crypto FX, metals and equities with provenance receipts for AI agents

Finance & CryptoPayments & trading

Outdated check221 ms15 / 22
MarketCrew — live market data & stock analysis

Stock prices, charts & technical analysis for US stocks, ETFs and crypto. Read-only, no signup.

Finance & CryptoData access / search

Outdated check234 ms15 / 22
Paycheck Calculator

Take-home pay for 2025-2026: IRS brackets, FICA wage base and state income tax for 50 states + DC.

Developer ToolsCode & DevOps

Responded242 ms15 / 22

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