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MCP servers published as npm packages: Unicode-LE to Vanguard Memory Node
8,832 servers in the MCP Registry are distributed as a Node.js package published to the npm registry. They run on the user's own computer and need Node.js; clients usually start it with npx.
| Server | Runs |
|---|---|
| Unicode-LEFind the Unicode that hides meaning: bidi controls, invisibles, homoglyphs and mixed scripts. | Local · stdio |
| UnifiUniFi semantic-analysis MCP — fleet health, anomaly detection, cross-site analytics. | Local · stdio |
| UniFi RMCPRust MCP server and CLI for UniFi Network controller operations. | Local · stdio |
| UniFi RMCPRust MCP server and CLI for UniFi Network controller operations. | Local · stdio |
| Unified Offer Protocol MCP ServerAI-powered product search, affiliate links, and price negotiation for e-commerce platforms. | Remote & Local · HTTP, stdio |
| UniprofUniversal CPU profiler designed for humans and AI agents. | Local · stdio |
| Uniprot MCPProtein sequences, names, and functions from UniProt. No key required. | Local · stdio |
| Uniprot MCP ServerProtein research over UniProtKB — search by function, fetch curated records, map IDs, proteomes. | Remote & Local · HTTP, stdio |
| UniRate-API MCPCurrency conversion and exchange rates for AI. 170+ currencies, historical data back to 1999. | Local · stdio |
| Unisender MCPMCP server for UniSender API — email lists, campaigns, contacts. API key auth. | Local · stdio |
| Uniswap Tx Builder MCPBuilds and simulates unsigned Uniswap v3 liquidity-position transactions — keyless, never signs. | Local · stdio |
| Unit Converter MCPConvert between units of length, weight, temperature, speed, and data size locally. No network... | Local · stdio |
| Unity MCP ServerMCP server for Unity: 130+ tools, Unity 6 skills, AI/ML discovery. No Editor. | Local · stdio |
| Universal Brute WorkpackStdio-first Agent MCP workpack for local tools, audit chains, search, memory, and pipelines. | Local · stdio |
| Universal Game ModderLocal MCP server: detects a game's engine and gives agents native binary analysis/patching tools. | Local · stdio |
| Universal Screenshot MCPMCP server for web page and cross-platform system screenshots (macOS, Linux, Windows) | Local · stdio |
| UnlimitedTTSQuote-first, non-custodial x402 text-to-speech with spend policy, MP3 artifacts, and receipts. | Local · stdio |
| UnlinkedMCP server that brings your LinkedIn professional profile and experience into your context. | Local · stdio |
| UnlocalhostDeploy localhost to a private, authenticated link from your AI coding agent. | Local · stdio |
| UnmarkdownThe document publishing layer for AI tools. Convert markdown to 6 destinations, 62 templates. | Remote & Local · HTTP, stdio |
| unmarkingInspect and remove C2PA content credentials from AI-generated images, video and audio. Free, no key. | Remote & Local · HTTP, stdio |
| unorouter.comSearch 200+ UnoRouter models (most free), check pricing, and chat through one key. | Remote & Local · HTTP, stdio |
| Unpaywall MCPOpen access links from Unpaywall. No key required. | Local · stdio |
| UnphurlURL intelligence for AI agents and developers. 16 tools, 25 signal weights, 20 free checks. | Remote & Local · HTTP, stdio |
| Unpkg MCPPackage file metadata from the unpkg CDN. No key required. | Local · stdio |
| Unraid RMCPRust MCP server and CLI for Unraid GraphQL operations across NAS, Docker, VM, and storage workflows. | Local · stdio |
| Unraid RMCPRust MCP server and CLI for Unraid GraphQL, NAS, Docker, VM, and storage workflows. | Local · stdio |
| Unreal Engine MCPAutomate the Unreal Editor (UE 5.0-5.8): levels, Blueprints, UI, materials, VFX and more. | Local · stdio |
| unreal-mcp-ue4UE4.27 MCP server for controlling Unreal Editor sessions over Python Remote Execution. | Local · stdio |
| unreal-mcp-ue4-for-ohdUE4.25 MCP server for Unreal Editor via Python Remote Execution (OHD mod-kit retarget). | Local · stdio |
| UnrealUGCGenerate and manage AI UGC video ads through eleven typed MCP tools. | Remote & Local · HTTP, stdio |
| Unsplash MCP ServerMCP server for the Unsplash API: search & fetch photos with attribution + download tracking. | Local · stdio |
| unstringifyFix broken JSON by line, validate, convert, read CSV/NDJSON/logs as records, unpack, compare. Local. | Local · stdio |
| UntappdMCP server exposing Untappd API tools for AI agents — full v4 read API coverage. | Local · stdio |
| Untappd MCPUntappd MCP — search beers/breweries/venues, read check-ins & wishlists, post check-ins. | Local · stdio |
| Untappd MCP by UnClickUntappd beer and brewery search, details, and activity. By UnClick. | Local · stdio |
| upAPIAll public upAPI operations as MCP tools: web scraping, search, screenshots, PDF, OCR and more. | Remote & Local · HTTP, stdio |
| Upbit MCPKorean crypto prices from Upbit. No key required. | Local · stdio |
| Upcitemdb MCPBarcode product lookup from UPCitemdb. No key required. | Local · stdio |
| Uphealth SignalThe adaptive health-messaging engine for apps and agents. Federally-sourced. Not medical advice. | Remote & Local · HTTP, stdio |
| upkeep-mcpWebsite maintenance checks: domains, SSL, uptime, technical SEO and accessibility. | Local · stdio |
| UplinkAutomate a real, logged-in browser on your own device — no stored credentials, no bot detection. | Local · stdio |
| UploadcheckQC videos, podcasts, and clips before upload — timestamped flags with agent-ready repair prompts. | Local · stdio |
| UploadkitUploadKit MCP — 40+ upload components, route scaffolds, BYOS setup, full docs search. | Local · stdio |
| uploads.shHost files from coding agents; stage on a branch and attach to GitHub PRs. | Remote & Local · HTTP, stdio |
| UpnextOne audio queue across Spotify, the browser, local files and whatever is already playing. | Local · stdio |
| UpshiftAudit a site's structured data and llms.txt, match a trade to a template, and quote real prices. | Remote & Local · HTTP, stdio |
| upstash MCP-SERVERManage Upstash databases and resources through the Upstash Developer API. | Local · stdio |
| UptierMCP-powered To-Do application with task prioritization. | Local · stdio |
| Uptime MCPCheck website availability, latency, and TLS certificate expiry locally. No key required. | Local · stdio |
| Uptimebolt MCP ServerAI-powered infrastructure monitoring — health, incidents, predictions, RCA, deploy safety. | Local · stdio |
| Uptimerobot MCPUptime, port, TLS and DNS checks for any site - no API key. | Local · stdio |
| UptyBotsUptime monitoring: create and manage HTTP, API, SSL, ping, port and domain checks. | Remote & Local · HTTP, stdio |
| Uranium MCPMCP for Uranium NFT tools to mint, list, and manage digital assets on the permaweb. | Local · stdio |
| Urdb MCPSearch URDB for product integrity scores, enshittification events, and change tracking. | Local · stdio |
| URL Safety Validator MCPAI URL safety validator: SAFE/SUSPICIOUS/DANGEROUS verdict, trust score, threat intel. | Remote & Local · HTTP, stdio |
| url2mdPDFs, JavaScript pages and ordinary HTML as clean Markdown. Follows robots.txt per RFC 9309. | Remote & Local · HTTP, stdio |
| URLs-LEExtract URLs from documentation, configuration and code, with their protocol and position. | Local · stdio |
| Urlscan MCPURL scanning from urlscan.io. No key required. | Local · stdio |
| Urlsnap MCPScreenshot, PDF, and markdown extraction from any URL via Claude Desktop and Claude Code. | Local · stdio |
| US Government DataUS government open-data APIs as MCP tools: EPA, FEMA, USGS, NOAA, FDIC, HUD, CMS and more. | Local · stdio |
| Us Regulations MCPUS compliance: HIPAA, CCPA, SOX, GLBA, FERPA, COPPA, FDA, EPA, FFIEC, NYDFS + 4 state privacy laws. | Local · stdio |
| Usable Browser AgentMCP server and Firefox add-on that let an AI agent drive your real, logged-in browser. Free tier. | Local · stdio |
| Usaspending MCPUSAspending federal agencies and awards, plus nonprofit filings. | Local · stdio |
| Usaspending MCP ServerAccess US federal award, recipient, agency, and spending analytics data from USAspending.gov. | Remote & Local · HTTP, stdio |
| Uscore Profile Gap LintFinds the FHIR R4 resources still pinned to US Core 3.1.1 or 5.0.1, and the USCDI v3 Patient element. | Local · stdio |
| Usda MCP ServerSearch foods, compare nutrients, and look up the full USDA FoodData Central database. | Remote & Local · HTTP, stdio |
| useqr-mcpStatic QR PNG/SVG for agents. Designer and dynamic codes live at useqr.co. | Remote & Local · HTTP, stdio |
| User IntuitionRun customer research studies, recruit participants, monitor interviews, and review reports. | Remote & Local · HTTP, stdio |
| UsercallGive your AI agents the ability to ask real users why. | Remote & Local · HTTP, stdio |
| useVyre ContextUseVyre component context for AI agents — valid props, variants, anti-patterns, and design tokens. | Local · stdio |
| USGS Earthquakes MCP by UnClickRecent earthquakes worldwide and by region, with detail, from USGS. No API key. By UnClick. | Local · stdio |
| Usgs Water MCPUse this MCP server to USGS streamflow, gauge status, and water observations. Tools include get... | Local · stdio |
| Usgs Water MCP ServerQuery real-time and historical USGS water data from ~8,000 stream gages and groundwater wells. | Remote & Local · HTTP, stdio |
| USRCP — User Context ProtocolEncrypted local ledger of structured user state, shared across every MCP-aware AI tool. | Local · stdio |
| Utilia Solana Transaction EvidenceSolana transaction diagnosis, simulation, token-risk evidence, and priority fees via x402 USDC. | Remote & Local · HTTP, stdio |
| Utuh watcherSweep bonded completeness claims on Creditcoin against Ethereum, and refute one that omits an event. | Local · stdio |
| uuaid MCPPermanent identity + encrypted, quantum-ready memory that outlives the session, for any AI agent. | Local · stdio |
| UuidMCP server for generating UUIDs (v4, v7), ULIDs, nanoids, random IDs. | Local · stdio |
| Uuid MCPGenerate UUIDs and validate formats locally. No network and no key. | Local · stdio |
| Ux MCP ServerUX toolkit: 28 knowledge resources, 23 analysis tools & 4 workflow prompts for any MCP client. | Local · stdio |
| uxlintAudit a site's UX the way a design-literate reviewer would, with a concrete fix for every finding. | Local · stdio |
| UxloomAgent-native UI/UX design validation: journey completeness, state coverage, and WCAG checks. | Local · stdio |
| V8 Cpu Profile Decoder MCPMCP server that decodes V8 CPU profiles into token-efficient bottleneck summaries for AI agents. | Local · stdio |
| VaayaPaid APIs and tokenized shares for agents. Prepaid funding, including authorized Instinct checkout. | Remote & Local · HTTP, stdio |
| VaemailEmail infrastructure for AI agents: send, authenticate domains, track delivery, diagnose issues. | Local · stdio |
| vaiz.comConnect AI assistants to your Vaiz workspace: tasks, projects, boards, documents and milestones. | Local · stdio |
| ValQA agent for vibecoded apps. Real browser checks, your AI fixes them. Ship to green. | Local · stdio |
| Valerie MCPFrench real estate AI: DVF transactions, internet coverage, market insights. Free + €5/month. | Local · stdio |
| ValidateDeterministic validation for AI-generated artifacts: JSON Schema, OpenAPI response, SQL syntax. | Remote & Local · HTTP, stdio |
| ValidateFinValidate SEPA, UBL/Peppol, XRechnung, camt, ACH & IBAN files locally — no data leaves your machine. | Local · stdio |
| Validoria MCPContinuous website testing by Validoria — monitor security, SEO, performance, and accessibility. | Remote & Local · HTTP, stdio |
| ValltAPI credential manager for Claude Code. Connect services, store keys in keychain, monitor health. | Local · stdio |
| Valorant MCPAgents, maps, and weapons from the Valorant community API. No key required. | Local · stdio |
| ValoriaMake money with x402. See what's earning, find profitable gaps, and price your service right. | Local · HTTP |
| Valoria IntelligenceFind where the money is in AI services. See what's earning and find market gaps. | Local · HTTP |
| ValtaFinancial governance for AI agents — spend gates and audit trail exposed as MCP tools. | Local · stdio |
| valvLet coding agents query any SQL database safely. Read-only by default and scoped by your policies. | Local · stdio |
| Vam MCPVictoria and Albert Museum collection search. No key required. | Local · stdio |
| Vanguard Memory NodeLocal deterministic BM25 memory for AI agents. Offline-first, no API key, SHA-256 shards, stdio. | Local · stdio |