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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18179 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
EU EORI Number Check

Verify EU EORI numbers in the official EC register before shipping. $0.01/call via x402.

Developer ToolsCode & DevOps

Responded201 ms14 / 22
Drug Label, Recall & Adverse Event Check (openFDA)

FDA label warnings, recalls and adverse event counts for a drug. $0.003/call via x402.

Developer ToolsCode & DevOps

Responded201 ms14 / 22
IronShard Object Storage Sandbox

Create a free sandbox object storage bucket; upload, download, list, inspect, and delete objects.

Developer ToolsCode & DevOps

Responded202 ms14 / 22
com.babyagecalculator/baby-age

Free hosted MCP server by Baby Age Calculator: exact baby age, zodiac, and milestone dates. No key.

Developer ToolsCode & DevOps

Responded204 ms14 / 22
Context Relay

Compact, citation-verifiable public web context for AI agents, paid per use with x402.

Developer ToolsCode & DevOps

Responded205 ms14 / 22
The JQ API

Free hosted jq MCP server for inline JSON, public HTTPS URLs, and reusable 15-minute uploads.

Developer ToolsCode & DevOps

Responded205 ms14 / 22
io.github.newspacemarket-com/mrd

Spacecraft component specs from vendor datasheets: search, digests, facts, gaps, budgets, bus design

Developer ToolsCode & DevOps

Responded205 ms14 / 22
A/B Test Sample Size Calculator MCP

Exact A/B test sample size, duration, z-test, chi-square, Fisher-Freeman-Halton and peeking risk.

Developer ToolsCode & DevOps

Responded205 ms14 / 22
DESIGN.md Linter & Extractor

Lint and diff DESIGN.md files with the official Google linter, or write one from a web page.

Developer ToolsCode & DevOps

Responded206 ms14 / 22
io.github.lxxmng/ocean-schedules

Compare ocean carrier schedules, transit times and reliability: 60+ carriers, 72,000+ sailings.

Developer ToolsCode & DevOps

Responded207 ms14 / 22
Counterparty Due Diligence

One-call counterparty screen: sanctions, export, PEP, registry. $0.10/call via x402.

Developer ToolsCode & DevOps

Responded208 ms14 / 22
HackMyIP — no-key IP intelligence

Free no-key IP intelligence: geolocation, VPN detection, DNS, WHOIS, blacklists, breach checks

Developer ToolsCode & DevOps

Responded209 ms14 / 22
X (Twitter) MCP Server by Xquik

Xquik is the world's fastest and cheapest X (Twitter) data API with the most complete X data.

Developer ToolsCode & DevOps

Responded209 ms14 / 22
POPCORN MCP

Witness layer for agents: signed receipts binding a fingerprint to a witnessed time. $0.001.

Developer ToolsCode & DevOps

Responded210 ms14 / 22
Wealth Engine — Economic Opportunity Intelligence

Ranked economic opportunities, market evidence, experiments, and margin intelligence for AI agents.

Developer ToolsCode & DevOps

Responded211 ms14 / 22
OpenSwissData

Swiss customs tariff (TARES), FINMA register, NOGA/NACE/ISIC codes. 4 free tools + search trial.

Developer ToolsCode & DevOps

Responded212 ms14 / 22
ToolSnap MCP

Deterministic AI agent microtools, no accounts/API keys. fetch_extract: 98% token cut. 47 tools.

Developer ToolsCode & DevOps

Responded212 ms14 / 22
Chapa

Read, compare, and verify public developer impact profiles and Chapa badges.

Developer ToolsCode & DevOps

Responded212 ms14 / 22
BEACON Commons

Discover tasks and reproducible results. Public reading; invited, host-approved contributions.

Developer ToolsCode & DevOps

Responded213 ms14 / 22
io.github.sly13/cryptoetf

Live spot crypto ETF flows for 16 assets and their funds, CEFI index and prices.

Finance & CryptoCode & DevOps

Responded213 ms14 / 22
Weav Customer Service

Explore Weav customer service pricing, features, comparisons, signup, and demos. No auth required.

Developer ToolsCode & DevOps

Responded214 ms14 / 22
io.github.iamalanlui/apipay

Prepaid balance for AI agents: one key, 4,900+ tools your agent can run today, caps, receipts.

Developer ToolsCode & DevOps

Responded214 ms14 / 22
Engg.space jobs

Search open engineering jobs at funded startups and AI labs, from company career pages. No key.

Developer ToolsCode & DevOps

Responded216 ms14 / 22
Nasaq UI

Nasaq design system docs for agents: 390 components for React, Vue, Blade and HTML, with Arabic RTL.

Developer ToolsCode & DevOps

Responded216 ms14 / 22

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