MCP HeartbeatTHE MCP OBSERVATORY
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Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

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DiscoveryServer directory

Remote MCP servers

Find a server for your workflow, with connection evidence you can inspect.

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18103 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
I Bond Rate MCP

Current I bond rate, what your I bond earns by issue month, and value estimates from TreasuryDirect.

Developer ToolsCode & DevOps

Outdated check199 ms14 / 22
2027 Tax Brackets and Standard Deduction MCP

2027 federal income tax brackets and standard deduction from IRS Rev. Proc. 2026-35.

GovernmentCode & DevOps

Outdated check200 ms14 / 22
Fmind Freelance AI Architect Website

Read-only access to Fmind's portfolio, articles, news, and sites.

Developer ToolsCode & DevOps

Responded202 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
BEACON Commons

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

Developer ToolsCode & DevOps

Outdated check204 ms14 / 22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
Social Security COLA 2027 MCP

Social Security COLA 2027, full retirement age, earnings test and 2027 limits from SSA notices.

Developer ToolsCode & DevOps

Outdated check206 ms14 / 22
OpenSwissData

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

Developer ToolsCode & DevOps

Outdated check207 ms14 / 22
HackMyIP — no-key IP intelligence

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

Developer ToolsCode & DevOps

Outdated check208 ms14 / 22
io.github.pscale-commons/bsp-mcp

Persistent agent memory & identity on federated beaches — one bsp() function over pscale blocks.

TravelCode & DevOps

Outdated check209 ms14 / 22
Gas Prices Today MCP

Gas prices today from the EIA weekly survey: US, region, state and city, with year-ago change.

Developer ToolsCode & DevOps

Outdated check209 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
Printwren: HTML to PDF and URL to PDF (real Chrome)

Printwren: web page or HTML to PDF with real Chrome; pages, base64 or download link. Free, no key.

Developer ToolsCode & DevOps

Outdated check210 ms14 / 22
Nomad Stays

Search remote-work accommodations worldwide; Trusted Stay Partners can manage their own listings.

Developer ToolsCode & DevOps

Outdated check211 ms14 / 22
ToolSnap MCP

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

Developer ToolsCode & DevOps

Outdated check212 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
Xquik MCP Server

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

Developer ToolsCode & DevOps

Outdated check213 ms14 / 22
PEP Screening (Politically Exposed Persons)

Check if a person is a PEP (Wikidata public offices) during KYC. $0.02/call via x402.

Developer ToolsCode & DevOps

Outdated check214 ms14 / 22
Nasaq UI

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

Developer ToolsCode & DevOps

Outdated check214 ms14 / 22
Seamgrin

Find alterations, free tailor training, and paid work opportunities for experienced tailors.

Developer ToolsCode & DevOps

Outdated check214 ms14 / 22
NoiseFloor — market attention and evidence checks

Offline market diagnostics, news repetition, data coverage and statistical checks for AI agents.

Developer ToolsCode & DevOps

Outdated check215 ms14 / 22

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