Best API AI Skills & MCP Servers

Provide access to the LittleSis API to track corporate power and accountability. Enable querying and exploring relationships and entities related to corporate influence. Facilitate integration of corporate data into LLM applications for enhanced context and insights.

IA-QA as an MCP Server Use IA-QA's developer tools to test your llm agents RAG ai tools, directly from Cursor, Claude Desktop, Windsurf, or any AI agent without leaving your IDE. Many classical testing tools too ! Enjoy ! No API key. No signup. Free.

Free UK SIC code lookup, GICS/ICB cross-classification mapping, and Companies House company search. No API key required. lookup_sic_code - Look up any SIC, GICS, or ICB code with full hierarchy and cross-mappings search_sic_codes - Describe a business activity in plain Englis

MCP server for the ClinicalTrials.gov v2 API. Search trials, retrieve study details and results, and match patients to eligible trials.

Compare API providers based on real-time pricing, performance benchmarks, and known issues. Evaluate detailed project profiles and past decision data to make informed architectural choices. Identify the most cost-effective and reliable solutions across various service categories

PoW CAPTCHA verification for MCP clients. Exposes generate_challenge and verify_solution tools — stateless proof-of-work that agents can embed in auth flows. L402 Lightning skip tier available for trusted clients. No API key required for PoW path.

OpenVan MCP Server exposes OpenVan.camp public APIs over the Model Context Protocol: fuel prices across 125+ countries, VanSky weather suitability scores (0–100), VanBasket food price index, currency exchange rates, vanlife events (expos, festivals, meetups) and aggregated news s

Real estate market intelligence, financial calculators, and capital advisory tools covering all 50 US states plus DC and Puerto Rico. Access CFO-level market data for 86,000+ locations, calculate DSCR and flip ROI with professional assessments, check financing eligibility, and sc

MCP server for the NCBI E-utilities API. Search PubMed, fetch article metadata and full text, generate citations, explore MeSH terms, and discover related research.

PDF to Markdown API for AI agents. Pay $0.001 USDC per page via x402. No accounts needed.

A Model Context Protocol server that taps access to real-time bus and train information across 12 Malaysian cities. Get live arrivals, vehicle tracking, and route details from Rapid KL, Rapid Penang, and various BAS.MY services across Malaysia. Currently covering the following a

Real-time NYC transit data for subway, bus, ferry, commuter rail, and Citi Bike. Get live arrivals, service alerts, trip planning, and station info across all MTA services. Zero API key required - just connect and query.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required - just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on

**Lightning-fast domain search directly in your AI workflow** Search domain availability, generate brandable alternatives, and validate bulk domain lists without leaving Claude, Cursor, or any other MCP-compatible environment. Powered by the same sub-10ms API infrastructure behi

Supply chain intelligence APIs for AI agents. Real-time freight rates (85+ carriers), crypto/forex/commodity prices, port congestion (NOAA), shipping lanes, economic indicators (FRED), and Cerebrix AI inference. 100 free calls/day, no signup. x402 USDC micropayments, ERC-8004 t

The base layer for AI agents. Five APIs: task deduplication, cost prediction, output validation, behavioral governance, and shared failure intelligence. 1,000 free credits/month, no card required.

AskMia eSIM API - Search, browse, and purchase prepaid eSIM data plans for 190+ countries. List available countries, search packages by destination, check network coverage, and generate Stripe checkout links for instant eSIM delivery. No API key required; optional key for higher

Real estate investment tools powered by DoorVault IDEAL Scoring v2.0. Analyze any rental property deal and get a structured verdict (IDEAL/PASS/NEAR-MISS/FAIL), capital velocity rating, priority score breakdown, dual rent scenarios comparing market rent vs Section 8 FMR, and a de

US federal and state statutory law MCP server. 529K sections across 50 states, the US Code, and Code of Federal Regulations. 11 tools: fulltext search, citation graph traversal, cross-reference navigation, risk surface analysis, doctrinal lineage. Free tier — no API key needed.

270+ quality-scored API capabilities for AI agents — compliance, company data, financial validation, web intelligence across 27 countries.

**CoachSync MCP** provides barbell strength training tools for AI assistants. Built for coaches, lifters, and fitness apps that want to add structured programming to their AI workflows. No API key required — connect and start using. ## Tools ### Warmup Calculator Generate a St

# NWO Robotics MCP Server Control real robots, IoT devices, and autonomous agent swarms through natural language — powered by the [NWO Robotics API](https://nwo.capital). --- ## What This Server Does This MCP server exposes the full NWO Robotics API as 64 ready-to-use tools.

Inspect and analyze running Go processes with detailed goroutine states, memory statistics, and binary information. Use an interactive terminal UI or HTTP API for programmatic access. Enable the MCP server to interact with Go process data via a Server-Sent Events endpoint and ava

Provision new tenants with admin setup and initial document templates. Add document templates to existing tenants to expand your workspace. Authenticate and connect to external APIs to perform secure operations.