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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3302 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
Website Change Monitor & Deterministic Diff

Deterministic webpage change detection, hashes and text diffs for recurring monitoring via x402 MCP.

Developer ToolsMonitoring & observability

Outdated check513 ms15 / 22
GhostSwap

GhostSwap — non-custodial crypto swaps across 1,600+ coins.

Finance & CryptoCode & DevOps

Outdated check520 ms15 / 22
0xinsider

Polymarket sports and esports data: wallet grades on settled P&L, large trades, markets.

Finance & CryptoPayments & trading

Outdated check520 ms15 / 22
Tolca

Web search + clean page text with sha256 proof, and company, sanctions and licence checks (x402)

Finance & CryptoData access / search

Outdated check521 ms15 / 22
VibeRaven

Check Supabase migrations for RLS and grant gaps; fixes for Supabase, Vercel, Stripe errors.

Finance & CryptoPayments & trading

Outdated check522 ms15 / 22
Article Content Extractor for AI Agents

x402 clean article text and metadata for AI/RAG. $0.002 per successful article.

Developer ToolsCode & DevOps

Outdated check525 ms15 / 22
three.ws 3D Studio (free)

Free text/image → 3D: generate, rig, avatar-ify, and refine GLB models. No auth, no payment.

Finance & CryptoPayments & trading

Outdated check529 ms15 / 22
Florida Business Verify (Sunbiz records)

Verify a Florida business in official Sunbiz records: status, agent, officers. 0.10 USDC via x402.

Finance & CryptoPayments & trading

Outdated check544 ms15 / 22
Signal Oracle

Pay-per-call change-intelligence feeds for AI agents over x402 (deps, security, regs, tariffs)

Developer ToolsCode & DevOps

Outdated check548 ms15 / 22
Axiom Agentic Tools

x402-paid Base agent tools (USDC). 5 deterministic tools. No API keys. No NFT pass.

Finance & CryptoPayments & trading

Outdated check553 ms15 / 22
Link Extractor for AI Agents

x402 structured link extraction for agents. $0.0005 per successfully processed page.

Developer ToolsCode & DevOps

Outdated check559 ms15 / 22
ABRA Flexi MCP by usefulapi

MCP server for ABRA Flexi — accounting, contacts, stock and draft-checked invoice creation.

Finance & CryptoPayments & trading

Responded566 ms15 / 22
Mazza Group AI APIs

23 pay-per-call AI APIs for agents: x402, USDC on Base, no API keys.

Finance & CryptoPayments & trading

Outdated check566 ms15 / 22
LastLook Data

FRED macro data, Treasury yields, FX rates & macro indicators for AI agents. Pay-per-query via x402.

Developer ToolsCode & DevOps

Responded568 ms15 / 22
X402-Broker Global A2A, MCP & x402 Super-Marketplace

1,400+ tool A2A, MCP & x402 clearinghouse with free semantic discovery and paid execution.

Finance & CryptoPayments & trading

Outdated check573 ms15 / 22
Veredicto Humano

Ask a real human (not an LLM) for a judgment, $0.10 USDC via x402. The result returns to the agent.

Finance & CryptoPayments & trading

Outdated check587 ms15 / 22
The White Report

The White Report news archive: crypto and AI stories, search, full text, ticker, graded calls.

Finance & CryptoPayments & trading

Outdated check587 ms15 / 22
Web Metadata, Open Graph & JSON-LD Extractor

Open Graph, JSON-LD, canonical, robots, headings and page metadata extractor via direct x402 MCP.

Developer ToolsCode & DevOps

Outdated check589 ms15 / 22
paidfor

Check an x402 seller before paying: verdict, failure rate and evidence from paid calls on Base.

Finance & CryptoPayments & trading

Outdated check589 ms15 / 22
Agent Safety Index

Is this AI agent safe with a wallet? Signed x402 Agent Safety exam results, and live demos.

Finance & CryptoPayments & trading

Outdated check596 ms15 / 22
SavingsLast retirement calculators

Retirement drawdown, 72(t) SEPP, RMD, Roth conversion, Social Security and state-tax calculators.

Finance & CryptoPayments & trading

Outdated check603 ms15 / 22
Tollkit

Web search, pages and PDFs, crypto market data, SEC filings and weather for agents. USDC per call.

Finance & CryptoData access / search

Responded605 ms15 / 22
Sitemap URL Extractor for AI Agents

x402 sitemap discovery and URL extraction for agents. $0.0001 per emitted URL.

Developer ToolsCode & DevOps

Outdated check616 ms15 / 22
BITHOT

Read-only MCP for curated crypto, Web3, and memecoin picks and reports.

Finance & CryptoCode & DevOps

Outdated check621 ms15 / 22

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