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MCP Tools | Model Context Protocol Server Directory

Discover, compare and configure open MCP servers that connect AI assistants to web, files, databases, search and developer tools.

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Directory overview
180
curated entries
18 topic groupsLive
04 / MCP DIRECTORY

Connect AI to the outside world

Context first, better decisions. Every entry keeps the signal that matters.

CURATED DIRECTORY180 results

SpecLock - AI Constraint Engine

Remote MCP
Free

AI Constraint Engine with AI Patch Firewall. 42 MCP tools. Patch Gateway (ALLOW/WARN/BLOCK verdicts), diff-native review (10 scored signals, hard escalation rules), Spec Compiler, Code Graph, Typed constraints, Python SDK, ROS2. Works with Claude Code, Cursor, Windsurf, Cline, Bolt.new, Lovable. 1073 tests. Free and open source. By Sandeep Roy.

3.6K starsView details

CSV to JSON Converter — Auto-Detect Delimiter

Remote MCP
Free

CSV parsing API for AI agents. Convert CSV data to JSON array with auto-detection of delimiter (comma, semicolon, tab, pipe). Header row support, type inference, and clean structured output. Tools: data_parse_csv_to_json. Use this for data import, ETL pipelines, spreadsheet processing, or converting tabular data for API consumption. Returns: {data[], headers[], rowCount, delimiter}. No API key required — x402 micropayment $0.001/call on Base L2.

3.6K starsView details

bjj-belt-progress

Remote MCP
Free

BJJ Belt Progress MCP server — instant access to IBJJF belt requirements, progression timeline calculations, and BJJ training facts for any AI assistant. Three tools: get belt requirements by rank, calculate your personal timeline from belt and training frequency, and retrieve data-backed BJJ progression statistics. Built for grapplers, coaches, and anyone asking AI assistants about BJJ belt progression.

3.5K starsView details

fyndling

Remote MCP
Free

# fyndling-mcp Built for **medieval market fans, reenactors, and living-history enthusiasts** — and the AI assistants that help them plan. Fyndling MCP gives AI clients direct access to two niche European datasets: - **Medieval events** — query 2,000+ markets, concerts, castle experiences, and living-history events across 20 European countries by **location + radius + date range** (updated weekly) - **Permanent POIs** — meaderies, mead producers, castles, and medieval restaurants, also searchable by geo-radius - **Historical recipes** — 1,100+ recipes from six cookbooks spanning the 13th–17th century, with modern German adaptations, structured ingredient lists, and original manuscript transcripts → **[fyndling.de](https://fyndling.de)** — the web app behind this data **Endpoint:** `https://fyndling.de/mcp` **Transport:** Streamable HTTP (MCP spec 2025-03-26) **Auth:** none **Rate limit:*

3.5K starsView details

dominion-observatory

Remote MCP
Free

Behavioral trust scoring and MCP gateway proxy for 14,820+ MCP servers. Query real attestation data — interaction history, success rates, latency, uptime — before your agent executes sensitive operations. **8 tools** for trust evaluation, server discovery, and health monitoring: - `get-trust-score` — instant trust score (0-100) for any MCP server - `query-server` — full behavioral profile with attestation evidence - `list-servers` — browse the entire 14,820+ server directory - `get-leaderboard` — top-ranked servers by trust score - `check-health` — real-time uptime and latency checks - `get-compliance-report` — MiCA Article 12 compliance attestation receipts - `report-outcome` — report tool call outcomes to improve trust data - `get-baselines` — historical behavioral baselines **MCP Gateway Proxy**: Route agent calls through Observatory for automatic trust verification and compliance att

3.5K starsView details

ArXiv Scout

Remote MCP
Free

Search and retrieve academic papers directly from arXiv with advanced query capabilities. Extract full text from PDFs to generate summaries, literature reviews, and side-by-side comparisons. Track citations and references to discover related research and map out academic trends.

3.4K starsView details

iAeternum

Remote MCP
Free

Intelligence Aeternum — AI training dataset marketplace with 100,000+ museum artwork images with 4K token .json metadata. Search, preview, and purchase curated art datasets with provenance tracking. Powered by x402 USDC micropayments.

3.4K starsView details

The STALL

Remote MCP
Free

293 AI-callable finance and data tools over MCP. No API keys required. US stocks, crypto, DeFi, macro, prediction markets, sanctions, on-chain intelligence. x402 USDC pay-per-call on Base. Built by IntuiTek1.

3.3K starsView details

AI Answer Copier

Remote MCP
Free

AI Answer Copier is a Model Context Protocol (MCP) server that solves the "Final Mile" friction in educational content creation. It enables AI models to move beyond just writing questions to actually generating the files required for teaching and assessment. By functioning as a native MCP server, this tool allows Claude or any MCP-enabled IDE to directly pipe its output into specialized educational formats. No more manually fixing bullet points in Word or wrestling with CSV headers for your LMS. Key Capabilities:Zero-Friction Pipeline: Your AI can now "see" your local export tools. Ask it to: "Generate 10 biology questions and send them directly to my Quizizz CSV." Multi-Format Exporting: Seamlessly convert AI responses into upload-ready files for Kahoot, Quizizz, Canvas (JSON), Moodle (XML), and professionally formatted PDFs. Intelligent Smart-Parse: Automatically identifies question st

3.3K starsView details

Synmerco — Confidential Escrow for AI Agent Commerce

Remote MCP
Free

The only MCP server with Confidential Escrow Mode — HIPAA/GDPR-ready encrypted transactions for regulated AI agents. 46 tools for the full agent commerce lifecycle. **Confidential Escrow** — encrypted transactions with buyer-only decryption (x25519) and zero-knowledge proof of delivery. The escrow system never sees the work product. Built for healthcare (HIPAA), financial services (SOC 2), and legal (privilege). **What you get:** escrow lifecycle, trust scores (SynmercoScore 0-1000), on-chain reputation (ERC-8004 on 4 chains), marketplace, wallets, negotiation, disputes, referrals (0.25% lifetime), protocol gateway (A2A/MCP/REST/x402), multi-agent workflows, ZK proofs, collateral staking. **10 tools work free — no API key needed.** $1K Shield Insurance per escrow. 3.25% flat fee. 179K+ agents in ecosystem.

3.2K starsView details

Lorem Ipsum Generator — Paragraphs, Sentences, Words

Remote MCP
Free

Lorem Ipsum placeholder text generator API for AI agents. Generate paragraphs, sentences, or words with exact count control. Classic Latin placeholder text for mockups and prototypes. Tools: text_generate_lorem_ipsum. Use this for generating placeholder content in mockups, testing layouts, or filling templates. Lightweight utility. Returns: {text, type, count}. No API key required — x402 micropayment $0.001/call on Base L2.

3.2K starsView details

ocean-schedules

Remote MCP
Free

Ocean freight sailing schedules & carrier on-time reliability. Compare carriers on any lane before you book: 72,000+ forward sailings, 5,000+ port-pairs, reliability scored from 4,200+ observed port calls (measured against first-declared schedules, to the minute). 9 tools incl. compare_lanes, carrier_reliability, transit_time, find_sailings. Free demo key smcp_demo_public — real data at schedulesmcp.com.

3.1K starsView details

openfoodfacts-mcp-server

Remote MCP
Free

Barcode lookup, nutrition search, and product comparison for 3M+ crowd-sourced food products.

3.1K starsView details

anchor-compliance

Remote MCP
Free

Australian advertising & marketing compliance for AI assistants. Scan websites, check ad/social/email copy, and look up regulator guidelines (ACCC, TGA, ASIC, AHPRA, ACMA) directly from Claude, ChatGPT, or Cursor. Tools: - `scan_website_compliance` — audit any public URL for AU advertising risk - `check_ad_copy` — analyse ad, social, or email copy for regulatory issues - `get_compliance_guidelines` — look up rules by industry & jurisdiction Free tier: 20 scans / 40 ad checks / 60 guideline lookups per IP per hour. Indicative results only — not legal advice. Built by [Anchor Compliance](https://anchorcompliance.io).

3.1K starsView details

QR Code Generator — Base64 PNG from Any Text

Remote MCP
Free

QR code generation API for AI agents. Generate QR codes from any text or URL: base64-encoded PNG output, configurable size (100-1000px). Fast and lightweight. Tools: utility_generate_qr_code. Use this for generating payment links, sharing URLs, encoding data for mobile scanning, or building checkout flows. IMPORTANT: For barcode generation (EAN-13, UPC), use utility_generate_barcode. Returns: {qrCode (base64 PNG), size}. No API key required — x402 micropayment $0.001/call on Base L2.

3.1K starsView details

Most Recommended Books

Remote MCP
Free

Read-only MCP server for verified book recommendations and reading lists. Ask who recommends a book, what books a public figure recommends, consensus best-of lists, series reading orders, and book summaries. No authentication required.

3.1K starsView details

Stexa Voice MCP

Remote MCP
Free

Connect voice telephony to your AI agent. Make outbound calls, get transcripts, check call status — all via MCP tools. Built on Asterisk + Yandex SpeechKit. OAuth 2.1, FZ-152 compliant.

3.0K starsView details

middleBrick | API-Security

Remote MCP
Free

Scan any API for OWASP Top 10 vulnerabilities and get a security risk score. Covers authentication, authorization (BOLA/BFLA), injection, data exposure, rate limiting, GraphQL, and LLM security.

2.9K starsView details

mainstreet

Remote MCP
Free

Onchain AI-agent reputation oracle on Base. Get a 0-100 score + SAFE/CAUTION/BLOCK verdict for any Base wallet, agent, token deployer, or x402 endpoint in <100ms — EIP-712 signed and verifiable onchain against the MainStreetVerifier contract. ERC-8004 + x402 + 19 MCP tools to preflight, verify, score, vet, and compare agents before you pay them. Free reads (100/day/IP); pay-per-call audits over x402 (USDC on Base).

2.9K starsView details

WorldMonitor MCP

Remote MCP
Free

Live global-intelligence data as a 74-tool MCP server: real-time markets, conflict events, country risk and resilience scores, shipping chokepoints, maritime, aviation and flight pricing, energy, climate, health, cyber threats, sanctions, trade flows, forecasts, and AI-generated world/country briefs. Also ships 25 Agent Skills, 6 workflow prompts, 11 resources, and 10 interactive in-chat apps. Discovery is anonymous — connect and issue tools/list, prompts/list, or skills/list with no key. Nearly every tool takes a JMESPath projection so agents fetch exactly the fields they need. get_sources is free and anonymous; signed-in accounts get a daily taste of the cached tools; full access via OAuth2 or an API key from worldmonitor.app/pro.

2.8K starsView details

agent-registry

Remote MCP
Free

The Registry for the Agent Economy Discover, verify, and connect with AI agents. The first protocol-aware directory built on the A2A standard.

2.8K starsView details

RedStone MCP

Remote MCP
Free

Real-time and historical cryptocurrency price data from RedStone oracle infrastructure. 1,300+ assets, 110+ chains, no API key required. Powered by 50+ DEX and 30+ CEX sources with $4.943B Total Value Secured.

2.7K starsView details

orcid-mcp-server

Remote MCP
Free

Researcher profiles, works, affiliations, funding, and peer reviews from the ORCID registry.

2.7K starsView details
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