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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2911 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
Subpay Document Reader

Reads AIA G702/G703 pay applications and change orders from PDF to JSON. $0.04/page via x402.

Finance & CryptoFile & docs

Responded1391 ms13 / 22
SODAX Builders MCP

Cross-network DeFi API data, AMM analytics, and SDK docs for 17+ networks.

Developer ToolsCode & DevOps

Outdated check1452 ms13 / 22
ベストカレンダー 暦データ

Japanese calendar data (rokuyo, lucky days, solar terms, holidays, moon, sunrise), 1926-2080.

ProductivityFile & docs

Outdated check1500 ms13 / 22
Open Creator Graph docs

How the Open Creator Graph works: records, confidence labels, AI consent, removals, reuse.

OtherOther

Responded1536 ms13 / 22
Lordevo Shop (x402 website checks)

33 paid x402 web/DNS/email/SSL checks for agents from $0.01 per call, plus 2 free tools.

ProductivityCommunication & messaging

Responded1635 ms13 / 22
DocMorph Studio

Render Mermaid diagrams, Markdown to PDF and outlines, image OCR, and media metadata cleanup.

MediaFile & docs

Responded1685 ms13 / 22
pg.ddx.io: the PostgreSQL community's memory

Every PostgreSQL mailing list since 1991, linked to the commits, code, commitfest and docs.

Developer ToolsCommunication & messaging

Outdated check2228 ms13 / 22
MSG91

Find and call the right MSG91 API for SMS, OTP, WhatsApp, Email and Voice.

ProductivityCommunication & messaging

Outdated check2814 ms13 / 22
ai.byteask/embedded-docs

Page-cited retrieval for embedded docs, datasheets, MISRA, CMSIS, and RTOS references.

OtherOther

Responded2976 ms13 / 22
Printwren: HTML to PDF and URL to PDF (real Chrome)

Printwren: web page or HTML to PDF with real Chrome; pages, base64 or download link. Free, no key.

Developer ToolsCode & DevOps

Responded182 ms13 / 22
LlmFiles

Convert PDF, DOCX, XLSX and 25 other formats to clean Markdown for LLMs and RAG. No key or account.

Developer ToolsFile & docs

Responded1086 ms13 / 22
io.github.geekmarine/mcp-email-auditor

Validates domain email MX records and DNS status via Cloudflare DNS-over-HTTPS.

Developer ToolsCommunication & messaging

Outdated check53 ms13 / 22
Tool Pantry

Find and use 216 free browser tools for PDF, images, video, audio and text that run locally.

MediaCode & DevOps

Responded59 ms13 / 22
io.github.geekmarine/mcp-domain-auditor

DNS resolution, HTTP security headers, and SPF/DMARC email hygiene audits.

Developer ToolsCommunication & messaging

Outdated check62 ms13 / 22
io.github.CCSTT-dev/callable

API for AI agents to delegate tasks to real humans.

Developer ToolsCode & DevOps

Outdated check77 ms13 / 22
Agent Channel Placement

Placement across agent channels: MCP, Cursor, Claude, ChatGPT, npm, docs, Smithery, Glama.

Developer ToolsCode & DevOps

Responded87 ms13 / 22
Public Board — Anonymous Message Board for AI Agents

Message board for AI agents: read, search and leave notes over HTTP, DNS or a non-CDN mirror.

Developer ToolsCode & DevOps

Outdated check91 ms13 / 22
Mygene Info

MyGene.info MCP. Docs: https://docs.mygene.info/en/latest/

Developer ToolsCode & DevOps

Outdated check93 ms13 / 22
Lob

Lob MCP — US address verification, bulk verification, and autocompletion (docs.lob.com). BYO-key…

Developer ToolsCode & DevOps

Outdated check97 ms13 / 22
Xposedornot

XposedOrNot MCP — free breach-exposure lookup by email.

Developer ToolsCommunication & messaging

Outdated check101 ms13 / 22
Sportmonks

Sportmonks Football MCP — wraps the Sportmonks Football v3 API (docs.sportmonks.com/football).…

MediaCode & DevOps

Outdated check101 ms13 / 22
Microsoft Todo

Microsoft To Do (Microsoft 365) MCP Pack

Developer ToolsCode & DevOps

Outdated check101 ms13 / 22
Ocrspace

OCR.space MCP — wraps the OCR.space API (ocr.space) for image/PDF → text OCR.

MediaCode & DevOps

Outdated check103 ms13 / 22
Leadmagic

LeadMagic MCP — wraps the LeadMagic B2B email-finder API (leadmagic.io)

Developer ToolsCommunication & messaging

Outdated check108 ms13 / 22

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