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

3355 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
BidGlow

Publish approved free listings and preview optional bids. No payments.

Finance & CryptoPayments & trading

Responded272 ms12 / 22
onchaincheck

100+ pay-per-call tools: token risk, wallet sanctions screening, onchain data, web, company, AI

Finance & CryptoPayments & trading

Responded290 ms12 / 22
NythosX Market Data

Crypto/stock trade setups, signal bias, levels, regime, odds. Free track record. Pay per call, x402.

Finance & CryptoData access / search

Responded290 ms12 / 22
Agent Data API

Token risk, wallet profiles, OFAC screening, whale trades on 6 chains. x402, USDC per call.

Finance & CryptoPayments & trading

Responded293 ms12 / 22
Teppi

Check what a paid x402 endpoint or MCP server delivered, from probes anyone can repeat.

Finance & CryptoPayments & trading

Responded300 ms12 / 22
AgentIndex x402

Jev-powered decisions, web search, PDF/web to Markdown, summarize. From $0.001, no API key.

Finance & CryptoData access / search

Responded300 ms12 / 22
sh.clearhouse/clearhouse

One search across every agent registry: 100K+ MCP/A2A/x402 services, signed receipts.

Finance & CryptoData access / search

Responded308 ms12 / 22
LocalMark Hosted Agents

Documents, data, localization, A2A repair and x402 analysis. Shared trial, then 0.05 USDC/task.

Finance & CryptoPayments & trading

Responded315 ms12 / 22
47620 Solana Data API

x402 pay-per-call Solana data + crypto market + JWT/unit utils for AI agents.

Finance & CryptoPayments & trading

Responded317 ms12 / 22
JKTJJ MCP Server

BJJ gym, coach, event, and city data for AI agents. Free base tools, x402-paid premium.

Developer ToolsCode & DevOps

Responded323 ms12 / 22
org.blocksigner/agentworld

Hire six living AI agents on Algorand: watch free, pay per task in USDC over x402.

Finance & CryptoPayments & trading

Responded330 ms12 / 22
Smartsheet Audit (x402)

Smartsheet workflow audit: free preview, full report $0.10 USDC on Base via x402.

Finance & CryptoPayments & trading

Responded340 ms12 / 22
agent-site-audit - website audits for agents

Paid website audits for agents: flat JSON, HTML report, deep audit. USDC via x402.

Finance & CryptoPayments & trading

Responded341 ms12 / 22
Kuotia

Spanish tax calendar, RETA and IRPF estimates and guides for autónomos in Spain, by Kuotia.

ProductivityFile & docs

Responded344 ms12 / 22
Revenue Agent — OpenAPI Audit & Change Detection

Paid OpenAPI audit and API change detection for agents. $0.10 USDC per analysis via x402 on Base.

Finance & CryptoPayments & trading

Responded360 ms12 / 22
Penny x402 utilities

Pay-per-call dev utilities (hash, base64, uuid, URL, time, NIP-19, BOLT11) via x402 USDC on Base.

Finance & CryptoPayments & trading

Responded366 ms12 / 22
x402 Toolbox

Free, read-only MCP subset of x402 Toolbox's cheap data endpoints, free via MCP.

Developer ToolsCode & DevOps

Responded371 ms12 / 22
Calculate.co.nz NZ Calculators

Search and run New Zealand tax, KiwiSaver, mortgage and property calculators

Real Estate & PropertyData access / search

Responded398 ms12 / 22
Agent Transaction Trust

Authorize and prove autonomous x402/AP2 agent payments with cryptographic receipts.

Finance & CryptoPayments & trading

Responded411 ms12 / 22
Base Token Check

Base token honeypot/tax/liquidity check via buy-sell simulation. Paid per call: 0.02 USDC (x402).

Finance & CryptoPayments & trading

Responded417 ms12 / 22
LaunchCheck x402

Paid x402 MCP tool for stress-testing launch and marketing copy before publication.

Marketing & SalesCode & DevOps

Responded426 ms12 / 22
ukintel.uk — UK company, tender and grant intelligence

Companies House, Find a Tender and Find a Grant as paid JSON for agents. USDC via x402, no signup.

Finance & CryptoPayments & trading

Responded434 ms12 / 22
Lilambd Data for Agents

21 world data tools: airports, units, markets, security, travel meds, pet entry. x402 per call.

TravelCode & DevOps

Responded436 ms12 / 22
Slid Phi Labs

CuNi exactness, Chamber two-key JSON, Agent-Rider. Lab signup, agent keys, x402 catalog.

Developer ToolsCode & DevOps

Responded437 ms12 / 22

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