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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41491 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
CloudSign MCP by usefulapi

Create, send and track e-signature documents with their files and recipients in CloudSign.

Developer ToolsFile & docs

Responded373 ms15 / 22
AI Storefront Readiness Grader

Grades any storefront URL A-F on 20 weighted conversion checks. $1.00/call via x402.

E-commerceCode & DevOps

Responded374 ms15 / 22
Agent Tools UK

Pay-per-use agent tools: screenshots, web to Markdown, PDF tables, OCR, UK company checks

Developer ToolsFile & docs

Responded375 ms15 / 22
0s and 1s CIS calculators

Free UK CIS calculators: deductions, deadlines, late penalties, gross payment test, verification.

Finance & CryptoPayments & trading

Responded375 ms15 / 22
Airbrake MCP by usefulapi

Read Airbrake projects, error groups, notices, deploys and stats; mute or unmute error groups.

Developer ToolsCode & DevOps

Responded375 ms15 / 22
4dayweek.io Jobs

Search reduced-hours jobs and employers: 4-day weeks, 9-day fortnights, half-day Fridays and more.

OtherData access / search

Outdated check375 ms15 / 22
io.github.UnityNodes/canton-ccpedia

Canton Network: CIPs and their on-chain vote outcomes, docs, forum, validator upgrade deadlines.

Finance & CryptoCode & DevOps

Responded377 ms15 / 22
stierproducts tier lists

S-to-F tier lists for 208 product categories. Every placement cited, with barcodes.

OtherOther

Outdated check377 ms15 / 22
art.maddegen.agent/solsnap

Solana token/wallet rug-risk scoring. Free scan; $2 SOL unlocks full wallet report. No signup.

Finance & CryptoPayments & trading

Responded378 ms15 / 22
Sorted Travel

Travel ranking, place facts, weather, visa, and profile tools for Sorted Travel.

TravelData access / search

Responded378 ms15 / 22
YRUZ x402 tools

Pay-per-call x402 tools: package advisories, EU tenders, Wikidata facts, promo board, web, crypto

Finance & CryptoCode & DevOps

Responded378 ms15 / 22
Privi Quantum

Quantum on IonQ/IBM/Braket: spending mandates, signed benchmarks, paid PQC CBOM, advantage receipts.

Developer ToolsCode & DevOps

Outdated check379 ms15 / 22
Supplementscanner

Live supplement prices per kg, serving or capsule from stores across Europe. Free, no API key.

Developer ToolsCode & DevOps

Outdated check380 ms15 / 22
Privi Verify

Manufacturing lot verification and chain of custody for AI agents, paid per call in USDC (x402).

Finance & CryptoPayments & trading

Outdated check380 ms15 / 22
Privi Anchor

Hash anchoring and proof-of-existence on chain for AI agents and apps. Free with an API key.

Finance & CryptoCode & DevOps

Outdated check380 ms15 / 22
Proof Holdings

One API, all things verified — control, delegation, human approval, anti-impersonation.

Developer ToolsCode & DevOps

Outdated check380 ms15 / 22
ViaFrei

The German Real-Time Mobility Context Platform for AI: traffic, trains, charging, parking, weather.

Data & AnalyticsData access / search

Outdated check380 ms15 / 22
Scribiz

Transcripts, summaries, chapters and timestamped answers for video links, for AI agents.

MediaAI / LLM tooling

Outdated check380 ms15 / 22
California C-10 Contractor Check

Paid source-linked California electrical contractor license preflight.

Developer ToolsCode & DevOps

Outdated check384 ms15 / 22
Source Library

Search 15K rare pre-modern texts translated to English: philosophy, religion, science, literature.

Developer ToolsCode & DevOps

Outdated check384 ms15 / 22
fynsight: MCP server for DATEV

DATEV financial data for AI assistants: P&L, KPIs, bookings, budgets and monthly reporting.

Developer ToolsCode & DevOps

Responded385 ms15 / 22
Brontide agent arena

THE MECH ARENA BUILT FOR AI AGENTS. HUMANS WELCOME. Pilot mech duels over MCP, free, no sign-in.

Developer ToolsCode & DevOps

Responded385 ms15 / 22
Tolca

Know who you are paying before you pay: Québec contractor and company checks, plus web search. x402.

Developer ToolsData access / search

Responded387 ms15 / 22
Kennmarq.com

Rules and code for marking AI images, video and audio with C2PA and watermarks

MediaAI / LLM tooling

Outdated check387 ms15 / 22

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