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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40680 servers

Ordered by checks passed
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
SiteCheck

225 pay-per-call agent tools: Polymarket, chain reads, DeFi, web, SEC, KYB, geo, dev, AI. x402

Finance & CryptoCode & DevOps

Responded158 ms15 / 22
Cairn Commons

Checked dependency-bug records: look an error up, check versions before installing.

Developer ToolsCode & DevOps

Responded159 ms15 / 22
afro.tools

Open-source API specs for African providers (payments, SMS, KYC, delivery) for AI agents.

Finance & CryptoPayments & trading

Responded159 ms15 / 22
voicehook

Talk with your agents. A voice call in the browser that your agent can start or join.

Developer ToolsCode & DevOps

Responded160 ms15 / 22
Bounty Engineer Agent Commerce

Remote MCP storefront for agent routing, verification, web extraction and x402-paid tools.

E-commerceCode & DevOps

Responded160 ms15 / 22
StackTheDeal Deals

Live, verified deals from StackTheDeal — every price checked on the retailer's own page.

OtherOther

Responded160 ms15 / 22
Digital Gemology: gemology glossary and grading report terms

Gemology glossary: grading report terms, 4 Cs, clarity, colored gemstones, how sparkle is measured

OtherOther

Responded160 ms15 / 22
PostData

No-signup IoT backend: device names, sensor readings, history and live charts. No API key needed.

OtherOther

Responded160 ms15 / 22
Zetesis Scientific Due Diligence

Due diligence on life-science claims: omics, trials, gene therapy. Dimension by dimension.

Developer ToolsCode & DevOps

Responded161 ms15 / 22
MiConvert File Converter

Convert files by URL: OFD→PDF, 3D/CAD (STEP, STL, GLB), images, audio, video, documents.

MediaFile & docs

Responded162 ms15 / 22
Retirement Contribution Limits 2027

401(k), IRA, HSA limits, age 60-63 catch-up, Roth catch-up rule, Social Security COLA, 2025-2027.

Developer ToolsCode & DevOps

Responded163 ms15 / 22
Business Frameworks

Operating judgement for businesses under $50M revenue. Free top layer; nodes and bundles over x402.

Developer ToolsCode & DevOps

Responded163 ms15 / 22
DropTheHassle

Your AI publishes your site: free HTTPS link, or a .com for €19 that goes live with no DNS.

Developer ToolsCode & DevOps

Responded163 ms15 / 22
OpenCaseLaw — Swiss Caselaw, Statutes & Doctrine

1M+ Swiss court decisions, statutes & doctrine with citation graph (DE/FR/IT). CC0, free, 42 tools.

LegalKnowledge & memory

Responded164 ms15 / 22
AgentPact

Agent-to-agent marketplace: discover offers, answer needs, negotiate deals, settle in USDC escrow.

Developer ToolsCode & DevOps

Responded165 ms15 / 22
Social Media Data API

Social listening and mentions: posts, search, comments, profiles, 10 platforms. Pay per call (x402)

Marketing & SalesData access / search

Responded165 ms15 / 22
AI Pricing Hub

Source-backed AI model pricing, rankings, history, and benchmark data.

Developer ToolsAI / LLM tooling

Responded166 ms15 / 22
Gnosis Memory

Persistent memory and vector search for AI agents. Hosted, OAuth-protected via Google sign-in.

Developer ToolsAI / LLM tooling

Responded166 ms15 / 22
Recipe Nutrition Calculator

Recipe nutrition from ingredient lines: USDA FoodData Central values, per serving, FDA rounding.

Developer ToolsCode & DevOps

Responded167 ms15 / 22
Agent Cost Hub

LLM API prices and AI agent cost estimates, verified daily. Read-only cost lookup tools.

OtherData access / search

Responded167 ms15 / 22
IBGE Brasil MCP

IBGE: geography, census, economy and health from the official APIs, with provenance. 23 tools.

GovernmentCode & DevOps

Responded168 ms15 / 22
PHP, Symfony & Laravel playground

Create shareable links to run Symfony, Laravel or plain PHP code in the browser, no install.

Developer ToolsCode & DevOps

Responded168 ms15 / 22
Qimena Qi Men Dun Jia & BaZi

Qi Men Dun Jia charts, BaZi Four Pillars, best-time ranking and solar terms. Free, no key.

Developer ToolsCode & DevOps

Responded168 ms15 / 22
Pinloft: Batch Geocoder — Address to Lat/Long + Census FIPS

Pinloft: US address to lat/lon, county, FIPS; reverse geocoding. Free, no key.

GovernmentCode & DevOps

Responded168 ms15 / 22

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