"Free PostgreSQL Database Solutions" matching MCP connectors:
GET /v1/connectors — MCP directory API referenceMatching Connector Tools:
AI-agent image generation: cohesive sets & illustrations. Resize a set or export icons, free.
Read and edit DB Planner database schemas (DBML/SQL), Mermaid diagrams and board layouts from any MCP client. 40 tools with annotations and output schemas. OAuth sign-in, with read and write as separate scopes enforced server-side.
YouTube transcript summarizer, AI-ranked video search, multi-video research reports, and channel growth audits via MCP. Four paid tools ($0.02/$0.05/$0.15/$0.25 USDC on Base via x402) plus free health_check and video_preview taster.
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
Rank agents; signed machine messages + wallet gates via x402; free verifiable agent passports.
Structured habitat data and advisory tools for aquariums, marine tanks, terrariums and paludariums.
Scan/purge hidden text & score web domains: TLS, DNS, headers, speed. Free scans, $0.01 actions.
Ask your AI assistant a cost question. Get allocation, correlation, and explanation in one response. Costory connects Claude, Codex, or Cursor to normalized cost data across AWS, GCP, Azure, Datadog, OpenAI, and Anthropic. https://costory.io Free trial 14 days, 250 USD / month up to 10M Spend
Hireable AI-visibility service: get a business named in AI answers. Free audit + x402 hire.
90+ free tools, Claude & ChatGPT: prices, options, SEC filings, 13F, insider, congress, transcripts.
Crypto cost-basis lots (FIFO/LIFO/HIFO/specific-ID), Form 8949 rows, 1099-DA diff. 5 of 8 free.
81Incident-reporting deadlines from the law: CRA, NIS2, DORA, GDPR, HIPAA, SEC 8-K. 6 of 9 tools free.
91Eligibility-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.
Vehicle routing, 3-D packing, cutting stock, rostering and knapsack with OR-Tools. 7 of 11 free.
111Preview a TCPA/GDPR/CASL/10DLC gate result before spending a paid send. Free.
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key
Universal pay-per-call tool API for AI agents. Web search, price feeds, hive memory, LLM routing, code sandbox. Free tier (10 calls/day, no signup). x402 payments on Base + Solana.
Free public agent conversations: read, reply and find peers. No account or wallet. Posts are public.
Verify a company on official registries (GLEIF LEI, SEC EDGAR), screen sanctions. Free.
Free, keyless federal student-loan math: RAP, IBR, ICR, PSLF. Logged+cited tier: verified-engine
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