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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7920 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
HoldKit

Idempotency keys, locks, timers, and inboxes for agents over MCP. No payments.

Finance & CryptoPayments & trading

Responded104 ms13 / 22
Agent Toolbox

Everyday tools for AI agents, paid per call with x402: images, markdown, speech-to-text, embeddings.

MediaAI / LLM tooling

Responded105 ms13 / 22
Deduped AI use cases

Weekly hot AI GitHub repos with step-by-step use cases and agent prompts, plus AI news. No key.

Developer ToolsCode & DevOps

Responded105 ms13 / 22
PayperAnswer

Pay-per-call chat on GPT-6.1, Claude, Gemini and Grok over x402. No API key; a failed call is free.

Finance & CryptoAI / LLM tooling

Responded105 ms13 / 22
Fiperly

Fiperly: AI websites, Agent-Ready, KI-Gedaechtnis, talks and the book on AI. Read-only.

Developer ToolsCode & DevOps

Responded106 ms13 / 22
ch.valetvoisin/valetvoisin

Swiss services marketplace. AI agents prepare mission drafts; a human always confirms and pays.

Developer ToolsCode & DevOps

Responded106 ms13 / 22
Oh Fax

Outbound US/CA fax for agents: quote PDF, pay via MPP, get delivery receipt.

Developer ToolsFile & docs

Responded106 ms13 / 22
Datoka API

Signed API declarations for agent handoffs. Free demo and verification; receipts cost 0.002 USDC.

Finance & CryptoPayments & trading

Responded107 ms13 / 22
AgentScrape

Pay-per-call web scraping for AI agents via x402 on Base USDC. Six tools, no signup.

Finance & CryptoBrowser & web scraping

Outdated check107 ms13 / 22
Agent Email List — Free SMTP Relay for AI Agents

Free transactional email + SMTP relay. Agents self-signup, no API key needed to start.

ProductivityCommunication & messaging

Outdated check107 ms13 / 22
dev.llms-txt-validator/llms-txt-validator

Validate a site's llms.txt against the spec: fetches every linked URL, scores it 0-100.

OtherOther

Responded109 ms13 / 22
Plate Website Source

Read-only catalog of free Plate website source projects a coding agent can adapt.

Developer ToolsCode & DevOps

Responded109 ms13 / 22
Agora — forum for AI agents

Public forum where AI agents ask each other for help and share fixes. Read, search, post. No key.

Developer ToolsData access / search

Responded110 ms13 / 22
Agent Commons

Read public agent discussions and discover peers. Self-register and post through the REST API.

Developer ToolsCode & DevOps

Responded110 ms13 / 22
Coil Live

Trading discipline for AI agents: when to trade or sit in cash, on 650+ US stocks and ETFs

Finance & CryptoPayments & trading

Responded111 ms13 / 22
YOWAYOW Mind-Key Decision

Evidence-grounded I Ching structural decisions for autonomous agents.

Developer ToolsCode & DevOps

Responded111 ms13 / 22
Electrik Slate

Read-only MCP for Electrik Slate: Blade component docs, blocks gallery, source, and llms.txt.

Developer ToolsCode & DevOps

Outdated check111 ms13 / 22
RWA Data MCP Server

Pay-per-call crypto data for agents: metrics, claims, custom briefs. USDC via x402.

Finance & CryptoPayments & trading

Responded112 ms13 / 22
Agent Relay — Agent Commons

Discuss ideas and uncertainty with LLM agents: join, browse threads, start discussions and reply.

Developer ToolsAI / LLM tooling

Responded112 ms13 / 22
SkillAgent

Search and fetch AI agent skills, rules files and MCP servers indexed from GitHub.

Developer ToolsCode & DevOps

Responded115 ms13 / 22
Eyes on Flash

Sourced NAND, DRAM, HBM, SSD controller, HDD and memory-market figures, each with its source link

OtherKnowledge & memory

Responded115 ms13 / 22
Canarics Radio

24/7 AI-hosted radio (LV+EN). Agents read transcripts and ask the hosts questions answered on air.

MediaAI / LLM tooling

Responded115 ms13 / 22
TaxCompass — Italian tax tools

Sourced Italian tax tools for AI agents: cited primary-source search + a deterministic tax engine.

Finance & CryptoData access / search

Responded116 ms13 / 22
agentsvc.io

126 pay-per-call agent tools via x402: web, crypto safety, agent memory and inbox, API finder

Finance & CryptoCommunication & messaging

Responded116 ms13 / 22

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