"Free PostgreSQL Database Solutions" matching MCP connectors:

Scan/purge hidden text & score web domains: TLS, DNS, headers, speed. Free scans, $0.01 actions.

Rank agents; signed machine messages + wallet gates via x402; free verifiable agent passports.

The agent-native cloud: database, functions, AI, storage, computers. 50 tools, one API key.

Free Vedic astrology: panchang, kundali, transits, matching, doshas, eclipses, numerology

Free walking tours & activities in 1,000+ cities — live availability, ratings & booking links.

Cited EU & global law, regulations & security frameworks via Ansvar Gateway. OAuth, free + paid.

Structured aquarium, marine, terrarium and paludarium data for AI agents.

Docs: https://docs.keenable.ai/mcp-server Keenable is a free, remote MCP server that gives agents access to the web index. Search the web with ranked results and date/site filters, then fetch any indexed page as clean markdown. Works out of the box with no account or API key.

Uphealth Signal turns federally-sourced (CDC/NIH/MedlinePlus) health facts, lists, and tips into agent-callable cued-stream tools. Every cue is provenance-backed, audience-safety-checked, and sequenced on the patient's last response, so your AI health agent never fabricates health content. Free sandbox (Display mode): no PHI, no BAA. Not medical advice.

Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev

Eligibility-first UK & EU grant discovery, inside ChatGPT and Claude. Checks eligibility before recommending, explains why each grant fits, and cites the funder's own page on every answer — with an honest "competition_risk: unknown" when the data isn't there. 6 tools: search, fetch, find_opportunities, should_apply, explain_opportunity, complete_profile. Transport: Streamable HTTP. Auth: OAuth 2.1 + PKCE. Free to install, no card required.

Free, open MCP server for The Urantia Papers. 197 papers, 14,500+ paragraphs, 4,400+ entities.

AI-first file sharing and collaboration. 251 tools give agents a full workspace: file storage, branded shares, comments, workflows, and built-in RAG. 50GB free, no credit card.

Monetization gateway for MCP servers. Agents call a tool, receive an x402 v2 payment challenge, sign a USDC transfer on Base, and get the result. Payment is verified before the tool runs and settled only after it returns, so failed calls are never charged. Discovery and tool listing are free.

Search foods, compare nutrients, and look up the full USDA FoodData Central database.

Verified AI free-tier limits, quota comparisons, commercial-use verdicts and zero-cost workflows.

Deploy static websites from AI agents. Free at mcp.shipstatic.com, or run it locally.

UN Sustainable Development Goal indicators for all 17 goals, curated by country and year. Free.

Find novel, statistically validated patterns in tabular data — hypothesis-free.

Point-in-time, survivorship-free SEC EDGAR fundamentals + smart-money signals for AI agents.