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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3359 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
io.github.Ainode-tech/cache-proxy

LLM caching proxy (x402 USDC on Base) - exact + semantic cache. Free health.

Finance & CryptoPayments & trading

Responded121 ms11 / 22
io.github.Ainode-tech/swiss-army

22 utility tools (x402 USDC on Base): currency, PDF, image, GDPR. Free health.

Finance & CryptoPayments & trading

Responded126 ms11 / 22
io.github.Ainode-tech/accounting-mcp

8 EU accounting (x402 USDC on Base): reconcile, VAT, invoicing. Free health.

Finance & CryptoPayments & trading

Responded127 ms11 / 22
io.github.ryuamarines/email-extractor

Extracts emails from texts. x402 payment required (testnet USDC).

Finance & CryptoPayments & trading

Responded131 ms11 / 22
Speak

Text to natural speech as MP3: 38 voices, 7 languages, 1,000 chars per call. Paid per call, x402.

Finance & CryptoPayments & trading

Responded132 ms11 / 22
observer.blacklight/signals

Realizability-gated Hyperliquid & Polymarket wallet copyability, risk & smart-money signals.

Finance & CryptoPayments & trading

Responded147 ms11 / 22
ACN Preflight

Preflight checks for agent repository contributions, bounty work, and Base payments.

Developer ToolsCode & DevOps

Responded159 ms11 / 22
one.easyrider/agent-board

Classifieds board for AI agents: free search and publishing, x402-paid full listings

Finance & CryptoData access / search

Responded172 ms11 / 22
Depcheck

Known vulnerabilities for exact package versions from OSV, with fixes. Paid per call, x402.

Finance & CryptoPayments & trading

Responded187 ms11 / 22
Rengi Forge

Gamedev tools for AI agents: level design, renders, sprites, GLB optimizer. Pay per call with x402.

Developer ToolsCode & DevOps

Responded190 ms11 / 22
io.github.mytab0r/pxbt-x402

Thai DTV/METV visa package pre-check over x402 (USDC on Base).

Finance & CryptoPayments & trading

Responded214 ms11 / 22
Delx Commerce — Pay-per-Result APIs for Agents

986 pay-per-result MCP/x402 APIs for web, data, Base, reliability and agent delivery.

Developer ToolsCode & DevOps

Responded214 ms11 / 22
Responded221 ms11 / 22
KAI Router

Find pay-per-call x402 tools (USDC on Base) for any task, ranked by relevance and real demand.

Finance & CryptoPayments & trading

Responded251 ms11 / 22
ai.tachyo/verify

Cryptographic proof of wallet ownership in two steps, with no keys and no custody.

Finance & CryptoPayments & trading

Responded268 ms11 / 22
FHI MCP Server Security Audit

Free payment guide and Base-USDC x402 MCP security, package, domain, and SEC tools.

Finance & CryptoPayments & trading

Responded306 ms11 / 22
Atinamos Agent Shop

Machine-service catalogue, payment hand-off and free market discovery for autonomous AI agents.

Finance & CryptoPayments & trading

Responded331 ms11 / 22
Academic Evidence Pack

Signed citation-integrity reports + retraction-checked evidence packs, paid per call via x402/USDC.

Finance & CryptoPayments & trading

Responded363 ms11 / 22
Ailabra Agent Profit Ledger

Determine autonomous-agent profit and cash flow with x402-paid MCP tools and signed reports.

Finance & CryptoCode & DevOps

Responded364 ms11 / 22
YouTube Video Summarizer (pay-per-call)

Summarize YouTube videos or fetch transcripts. Pay-per-call via x402 (USDC on Base), no account.

MediaPayments & trading

Responded373 ms11 / 22
ParquetHarmonize

Harmonize Parquet schemas; ordinary unions are free, residual reconciliation is x402-gated.

Developer ToolsCode & DevOps

Responded395 ms11 / 22
Creator Desk Commerce Completion Verify

Evidence-based commerce completion checks for agents. x402 paid calls and free standard metadata.

Developer ToolsCode & DevOps

Responded415 ms11 / 22
US Company Intelligence for AI Agents (SEC EDGAR, x402)

SEC EDGAR company briefs for agents: cited synthesis, XBRL metrics. x402/USDC, no account.

Finance & CryptoPayments & trading

Responded431 ms11 / 22
io.github.michu5696/paycrow

Escrow protection for agent payments on Base — USDC held in smart contract until job completion.

Finance & CryptoPayments & trading

Responded433 ms11 / 22

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