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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18175 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
OboeLib — Conservatory Oboe Fingering, Half-Hole, Forked F & Trill Chart Engine

Look up Conservatory oboe fingerings, half-hole, left/forked F rules, octave keys & trills.

Developer ToolsData access / search

Responded66 ms15 / 22
CheckChinaTransit — China 24/240-Hour Visa-Free Transit Compliance Engine

Verify China 240-hour (formerly 144h) visa-free transit eligibility, ports & third-country routes.

Developer ToolsCode & DevOps

Responded66 ms15 / 22
Qiniso

Deterministic fact verification for AI agents — checksums & curated data, not guesses.

Developer ToolsCode & DevOps

Responded67 ms15 / 22
InferIndex

LLM API prices across 70+ providers: cheapest offer, comparisons, history and cost estimates.

Developer ToolsCode & DevOps

Responded68 ms15 / 22
Electronic Compliance Objects (49 markets)

Each market's disclosure regime as one sourced, signed object, with the issuer's ACM-68000 signal.

Developer ToolsCode & DevOps

Responded68 ms15 / 22
Receipts Index

Free index and sample of dated AI-engine answer rows; prices for paid x402 rows. Never pays.

Developer ToolsCode & DevOps

Responded69 ms15 / 22
AgenticWebScore

Scan a public website for AI agent readiness: 60 checks, a score, and the evidence for each.

Developer ToolsCode & DevOps

Responded69 ms15 / 22
Appeal My Claim

Appeal a denied US health insurance claim: denial codes, rights, deadlines and a draft letter.

Developer ToolsCode & DevOps

Responded70 ms15 / 22
Responded70 ms15 / 22
Agent Bounty Feed

Open, paid bounties AI agents can claim, verified hourly from funded boards and audit contests.

Developer ToolsCode & DevOps

Responded70 ms15 / 22
PromptSpend

LLM pricing where every rate carries its source and the date it was last confirmed.

Developer ToolsCode & DevOps

Responded70 ms15 / 22
Protologue

Sourced, citable definitions of prompting and LLM techniques, with relations and primary sources.

Developer ToolsAI / LLM tooling

Responded70 ms15 / 22
MCP Queen

The evidence layer for MCP: live operational grades plus Trust Receipts for every registry server.

Developer ToolsCode & DevOps

Responded70 ms15 / 22
MahjongHandbook — American NMJL, MCR & Riichi Mahjong Scoring Rules Engine

Query American NMJL, Chinese Official MCR (81 Fan) & Japanese Riichi Mahjong scoring rules.

Developer ToolsCode & DevOps

Responded70 ms15 / 22
Zhiyong Agent Network

Discover AI tools, models and Agents; compare candidates, inspect unknowns, join public discussions.

Developer ToolsCode & DevOps

Responded71 ms15 / 22
CARDZ MCP

Pokémon & One Piece PSA 10 data for any AI agent

Developer ToolsCode & DevOps

Responded71 ms15 / 22
web2mcp

Zero-dependency Cloudflare Worker gateway turning websites and REST APIs into MCP tools.

Developer ToolsCode & DevOps

Responded72 ms15 / 22
GodPrompt MCP Server

GodPrompt MCP + Agent Skill for coding agents with TDD, debugging, verification, and task routing.

Developer ToolsCode & DevOps

Responded72 ms15 / 22
AiVikings.ai

Find, register, and manage domains from any AI chat or agent

Developer ToolsCode & DevOps

Responded72 ms15 / 22
McpStamp Job Cards

Job cards for on-site crews: labour hours and materials per job, client signature, totals.

Developer ToolsCode & DevOps

Responded73 ms15 / 22
Oh My Share

Publish HTML/code from your agent to openanthropic.com and get a shareable link.

Developer ToolsCode & DevOps

Responded73 ms15 / 22
HORIZON SHIELD Construction Cost Data: JCCDB (Japan) and USCCDB (United States)

Public construction cost data for Japan and the U.S., each row with its source URL and licence.

Developer ToolsCode & DevOps

Responded73 ms15 / 22
海棠诗社

Search and browse classical Chinese poetry on haitang.app. Read-only and public.

Developer ToolsCode & DevOps

Responded73 ms15 / 22
Badabun

Notas de Badabun (medio digital mexicano): últimas, búsqueda, lectura en Markdown y secciones.

Developer ToolsFile & docs

Responded73 ms15 / 22

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