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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2895 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
YangOpen

Vietnamese-first text to speech, photo tools, Word to PDF and TCVN3/VNI fixes. Free daily allowance.

MediaAI / LLM tooling

Outdated check132 ms13 / 22
Kokomoji

Kokomoji NFTs, ERC-8004 agents, jobs, open board and docs. Paid tools return x402 payment terms.

Finance & CryptoPayments & trading

Responded138 ms13 / 22
Vooks docs

Search and fetch the published Vooks API documentation and pricing pages.

OtherFile & docs

Outdated check138 ms13 / 22
Graph Paper

Check a plot document and get a link that opens it in Graph Paper. No account, no key.

OtherFile & docs

Outdated check139 ms13 / 22
ro.avizo/avizo-mcp

Avizo (RO SME compliance-deadline SaaS) as MCP tools: about, plans, categories, docs. Read-only.

Developer ToolsCode & DevOps

Outdated check142 ms13 / 22
LsTuvi - Tử Vi & Lịch âm

Vietnamese Tử Vi charts, lunar calendar, good-day finder and age compatibility. Free, no sign-in.

ProductivityFile & docs

Responded153 ms13 / 22
Regex/Email/URL Validator

Regex matching, email/URL format validation, and JSON Schema validation.

Developer ToolsCommunication & messaging

Responded158 ms13 / 22
HotAPI Docs

Read-only HotAPI documentation: search integration guides and inspect OpenAPI operations.

Developer ToolsFile & docs

Responded162 ms13 / 22
com.freebatteryfactory/docs

Search and read the Free Battery Factory docs (LiteShip, batpak) as live MCP tools.

Developer ToolsData access / search

Outdated check162 ms13 / 22
GBG Loqate - Reach

Verify addresses, email addresses, and phone numbers with confidence scores.

Developer ToolsCommunication & messaging

Outdated check164 ms13 / 22
ComplyOnSite

Waste codes, transfer notes filled in from chat, HAVS, noise and first-aid calculators.

ProductivityFile & docs

Responded171 ms13 / 22
Shapesoda

Vectorize images: PNG/JPG to SVG, PDF, EPS, DXF. Turns logos, icons and scans into clean vectors.

MediaFile & docs

Outdated check189 ms13 / 22
TradeAlmanac

TradeAlmanac market data: dividends, screener, sentiment indicators, calendar effects, stock lists.

Finance & CryptoData access / search

Outdated check194 ms13 / 22
Totally Tarot Calculators

Astrology, Vedic, Chinese and Maya calendar maths on real engines, cited in every answer.

ProductivityFile & docs

Outdated check198 ms13 / 22
Heffl Free Tools

Free email verification, business calculators, UAE estimates and drafts. No API key.

ProductivityCommunication & messaging

Responded199 ms13 / 22
Uptimeify

Free anonymous website, DNS, email and TLS checks, plus monitor read and opt-in write access.

ProductivityCommunication & messaging

Outdated check200 ms13 / 22
CSIDIA — operational notes and capabilities

AI regulation, data protection and compliance notes from CSIDIA, plus its capability catalogue.

LegalKnowledge & memory

Responded205 ms13 / 22
io.github.causa-prima-ai/scribo

EN 16931-compliant e-invoices: XRechnung, ZUGFeRD, Factur-X, Peppol BIS, Facturae or US PDF. Free.

Finance & CryptoPayments & trading

Responded209 ms13 / 22
scan.mx Email Diagnostics

Email deliverability check: MX, SPF, DKIM, DMARC, blacklists, MTA-STS, DNSSEC, BIMI. Graded, no key.

ProductivityCommunication & messaging

Outdated check210 ms13 / 22
Briefverzenden — fysieke post

Verstuur een echte brief per post in 22 landen: lever een PDF aan, wij printen en posten hem.

OtherFile & docs

Outdated check211 ms13 / 22
TextClean MCP

Free deterministic PDF, Markdown, citation, invisible-character, and formatting cleanup for agents.

Developer ToolsFile & docs

Outdated check212 ms13 / 22
agent-exec

Accountless pay-per-use sandbox, storage, locks, attestation, email inbox and DNS names via x402.

ProductivityCommunication & messaging

Outdated check219 ms13 / 22
ai.kaiv/email-check

Email posture for any domain: can it receive mail, can it be spoofed? MX, SPF and DMARC.

ProductivityCommunication & messaging

Responded223 ms13 / 22
spicytrade

Options quotes, IV rank and term structure, a catalyst calendar and a daily options brief.

Developer ToolsCode & DevOps

Responded229 ms13 / 22

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