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

1052 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
GrabMail disposable email

Disposable email for agents: create an inbox, wait for the message, read the code. No key needed.

ProductivityCommunication & messaging

Outdated check328 ms11 / 22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

Outdated check347 ms11 / 22
us.recalert/mcp

Search U.S. product recalls (CPSC, FDA, NHTSA, FSIS) by product, brand, model, or UPC code.

Developer ToolsData access / search

Outdated check358 ms11 / 22
dev.fly.looper-products/app-reviews

Read-only tools: App Store customer reviews and Docker Hub repo metadata.

Developer ToolsCode & DevOps

Outdated check432 ms11 / 22
oasdiff

Detect breaking changes, generate changelogs, diff, and validate OpenAPI specs.

Developer ToolsCode & DevOps

Outdated check470 ms11 / 22
PlanLimits

AI coding plan limits (Claude Code, Codex, Cursor, Copilot): router, picker, status, budget check

Developer ToolsAI / LLM tooling

Outdated check474 ms11 / 22
io.github.hellosg/coderegistry

Enterprise code intelligence for M&A, security audits, and tech debt. Hosted server with 200k free.

Developer ToolsCode & DevOps

Outdated check479 ms11 / 22
Owl Group Trading — Indicator Code

Verified cross-platform implementations of Owl Group Trading indicators as queryable code.

Finance & CryptoPayments & trading

Outdated check540 ms11 / 22
Bring Your AI

No-data MCP handoff for local Claude Code to Codex harness moves. $49 lifetime.

Developer ToolsAI / LLM tooling

Outdated check571 ms11 / 22
io.github.HectorGuerilla/review-mcp

Multi-model code review: a panel of models + detectors return a pass/fail verdict. Paid via x402.

Developer ToolsCode & DevOps

Outdated check588 ms11 / 22
Rolling Edition

Search, read and cite technical books whose code examples run on each edition's pinned versions.

OtherData access / search

Outdated check677 ms11 / 22
Namli

Checks if a project, brand or app name already exists: trademarks, domains, web and GitHub.

LegalCode & DevOps

Outdated check797 ms11 / 22
io.github.rainbow686/china-export-rebate-mcp

China export tax rebate rate & HS code lookup (官方退税率).

Developer ToolsCode & DevOps

Outdated check1029 ms11 / 22
com.bankcodelookup/site

Bank Code Lookup: the site's own MCP server — dataset, enquiry (enquiry = a human handoff, not a...

Data & AnalyticsData access / search

Outdated check1182 ms11 / 22
QuintaDB

No-code databases, forms, portals and AI sites. Manage records and automation via natural language.

Developer ToolsAutomation & workflows

Outdated check1316 ms11 / 22
QuintaDB

No-code databases, forms, portals and AI sites. Manage records and automation via natural language.

Developer ToolsAutomation & workflows

Outdated check1317 ms11 / 22
monit.rs

Schema-aware API monitoring: diff OpenAPI specs for breaking changes, manage endpoints.

Developer ToolsMonitoring & observability

Outdated check1814 ms11 / 22
MANA — la vie locale française

Lieux, commerces, artisans et associations en France — 3,7 M de fiches, rangées par code NAF.

OtherOther

Outdated check2115 ms11 / 22
PublicAPIs.io

Search 1,500+ public APIs with docs, code and auth/free-tier filters; list or sponsor your API.

OtherData access / search

Outdated check3430 ms11 / 22
Outdated check30 ms11 / 22
Outdated check30 ms11 / 22
Outdated check30 ms11 / 22
Outdated check30 ms11 / 22
Outdated check31 ms11 / 22

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