"How to Query a Knowledge Graph Using an Ontology" matching MCP connectors:
Matching Connector Tools:
Query and join across SaaS tools, SQL, and NoSQL databases through one unified SQL interface.
Gateway between LLM agents and world data through eight tools and a bundled endpoint catalog.
Search live job postings from 30+ ATS feeds and job boards, normalized to one schema.
Scans text for personally identifiable information — emails, phone numbers, SSNs, credit card numbers, physical addresses, names — and returns a redacted version. Built for agents sanitizing user content, support tickets, logs, or documents before storage, sharing, or feeding into another LLM call. Pay-per-call via x402 (USDC on Base): $0.01/call, no account or API key. tools/list and /openapi.json are free for discovery.
Scrapingdog MCP — wraps Scrapingdog (scrapingdog.com), a proxy-based web
Auto-discover validation rules from data — scan, profile, health-score. No rules to write.
Query, join, profile, clean and convert CSV/JSON/Parquet with server-side DuckDB over MCP.
Excel analytics: inspect, query (JSON rows), charts, and JSON-to-xlsx workbook writing.
AI access to Quadratic spreadsheets: open files, run Python/SQL, query connected databases.
Self-hosted, open-source MCP gateway: turn any API, database or MCP server into custom connectors for Claude, ChatGPT, Gemini, Copilot & Cursor — no code. Converts REST, SOAP, WSDL, GraphQL & SQL to MCP, with OAuth2, RBAC & audit log. 175+ pre-built adapters. This is the public read-only demo endpoint — run your own at https://github.com/HelpCode-ai/anythingmcp
Connect your Nubank account to AI via Brazil's Open Finance: balances, statements, cards, investment
Privacy-first web analytics. Query pageviews, referrers, trends, and AI insights.
Interact with your Google Cloud Datastream resources using natural language commands.
Document processing, data conversion, and web content APIs for AI agents. All tools are free via MCP. Also available as a paid x402 Agent API (Stellar XLM or Solana USDC, no API key required). Tools: extract text from PDFs, merge PDFs, generate QR codes, convert CSV to/from JSON, count words/stats, and fetch + clean any public URL with Mozilla Readability.
AI web extraction: send URLs + a JSON Schema, get clean structured data. Pay-per-use via x402.
An MCP server that provides bazaarvoic JOLT transformation capabilities.
RChilli MCP Hub is a production-grade MCP server that exposes RChilli's full HR data intelligence platform as 17 AI-callable tools across 4 categories. Built on 15+ years of HR data intelligence, it is trusted by ATS vendors, HR technology platforms, staffing agencies, and enterprise recruiting teams worldwide. Every tool is read-only and returns a consistent, structured JSON response — no raw exceptions, no inconsistent formats.
Map messy columns to a known schema — 7 scorers, domain dictionaries, F1 0.84. Zero config.
One command to validate, transform, and deduplicate — chain GoldenCheck + Flow + Match.