"Free PostgreSQL Database Solutions" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
DC Hub is the live data layer for data-center siting that agents can query and cite. Its Data Center Power Index (DCPI) scores where data centers can get grid power across 300+ markets daily. Also 330,000+ mapped power, grid, gas and fiber assets. 94 MCP tools at https://dchub.cloud/mcp plus a REST API at https://dchub.cloud/api/v1. Free tier needs no key; paid plans: dchub.cloud/pricing.
Climate and disaster risk for any place on Earth, from open scientific data. Ask about a city, an address or coordinates and get the 7-day weather risk (heat and cold stress, wind, heavy rain, snow), hazards happening nearby right now (wildfires, earthquakes, floods, cyclones, volcanoes, air quality), long-term climate exposure to 2050 and 2080 (flood depth, sea level rise, extreme heat, drought, water stress) and the country's disaster-risk profile with ~160 benchmarked indicators. Every value cites its source: INFORM, ND-GAIN, World Bank, CMIP6, ERA5, IPCC AR6, WRI Aqueduct, GDACS, NASA FIRMS, OpenAQ, ECCC GDPS. Remote, free, no API key, read-only.
64 individually priced Chinese company data tools at 0.011 USDC per call via remote MCP/x402 on Base; 68 MCP definitions total. Legacy Basic (3 modules, 0.032 USDC) and Full (9 modules, 0.093 USDC) remain separate packages. Additional HTTP x402 products, NOT new MCP tools: Standard screening 0.29 USDC (ten Jinghai checks, JSON plus Chinese/English HTML); Enhanced screening 0.59 USDC (the same ten checks plus exactly one QCC qualifications check); QCC qualifications 0.03 USDC (normalized JSON, up to 30 records, no screening analysis). Product guide: https://yangchunhong3000.github.io/cn-evidence-public-docs/products.html Discovery is free; data queries require a funded Base USDC wallet and explicit x402 spending approval. Plain MCP clients do not pay automatically. Most V3 company tools require company_id from company_detail; record details use record_id from a matching, separately paid parent list. New paged lists return at most five first-page rows; legacy lists at most ten. No automatic pagination, top-up, retry or repayment. Provider balance and service availability apply. Selected records and limited-scope screening only: empty is not no risk; statistics/trends are not detailed records. No complete due diligence, human review, factory verification or supplier-safety guarantee. Native MPP is paused. Internal owner-funded HTTP company-detail, Standard and old QCC v1 samples passed paid delivery/recovery checks. The later QCC v2 funding-policy revision has offline/isolated and unsigned checks, not a fresh funded acceptance. These tests are not customer sales or certification of every tool or MCP client. Live products: https://api.cnevidence.com/free/cn/products
Search and read Edgepedia, a free and growing encyclopedia with citations. No key.
It connects with Smart Data models database with more than 1000 open licensed data models and helps you to create applications and systems interoperable with existing standards or real applications
Free live public-safety incident map: global crime, fire, disaster, weather and news feeds
Fintech funding rounds, companies, investors, daily digest, podcast. Free, keyless, CC BY 4.0.
US ISO interconnection queues and cited energy data. 25 free queries, then $49/mo or $490/yr.
Source-attributed data, table validation and file conversion for agents. Free data tools; country reports and reconciliation: 0.002 USDC. Supported file conversions: 0.01–0.02 USDC. Start: https://datoka.dev/qa. Provenance checks are not independent factual verification.
Spanish Companies Registry gazette (BORME) joined with public grants (BDNS) and public procurement awards (PLACSP) per company, for KYB and due diligence. Every fact links to its official publication. Bearer API key (free: 500 calls/day) via https://asientouno.com/contacto.
Verified data on 8,000+ AI tools for any AI assistant: live status, pricing reality, user sentiment, viability, and alternatives, every answer carries a last-verified date. Free, read-only, no auth.
Three public-data tools as MCP tools: building permits from 16 US city open-data portals on one schema (contractor leads, permit velocity); job postings from 9 ATS platforms (Greenhouse, Lever, Ashby, Workday, SmartRecruiters, Workable, Recruitee, Personio, Rippling) with company to ATS auto-discovery; and a free company ATS detector. Runs on Apify; send your Apify API token as a Bearer token. Pay per result, no subscription. https://makenomistakesllc.com
Search US product recalls (FDA, USDA, CPSC) via MCP. Free API keys or $0.025 USDC/call on Base via x402. Tools: search_product_recalls, search_product_recalls_by_upc, search_product_recalls_from_image. Docs: https://recallkitchen.com/docs/ GitHub: https://github.com/Recall-Kitchen/rk-mcp
US government data as clean JSON for AI agents: SAM.gov contract opportunities, USAspending awards, Grants.gov grants, House STOCK Act trades, and SEC EDGAR filings (Form 4 insider trades, 8-K events, 13F holdings, 13D/G stakes, XBRL fundamentals, 10-K/10-Q sections). 19 read-only tools. Data is as fresh as each source publishes; congressional trades lag up to 45 days and report dollar ranges (House only). Free tier, no card.
Wikipedia page views over time, with growth for any article topic. Free key at trendsmcp.ai
Free, no-auth connector on French real estate public data: price per square meter by municipality (DVF), market summaries (rent, yield, price trend, ABC zoning), and urbanism/permit requirements for renovation projects.
Search disc golf discs, compare Speed/Glide/Turn/Fade flight ratings, and find similar alternatives across brands. Free, public, read-only.
One MCP endpoint over 69 public PPN APIs: search_apis to discover, execute_api to call. Free tier.
Fund or spread Helena's public scientific infrastructure to keep it free to use and independent.
Winning numbers for 30+ world lotteries, minutes after each draw. Free, no key, CC BY 4.0.
