"Free PostgreSQL Database Solutions" matching MCP connectors:

See what actually settles on x402: wash-adjusted volume, payTo checks. Free, no key, no signup.

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.

Pay-per-use tool API for AI agents. Free tier, x402 USDC micropayments, or API key.

The trust layer of the x402 economy: free conformance checks, attestation, corpus, agent store.

European payment QR — SPAYD (CZ/SK) & EPC/GiroCode (SEPA), plus text/WiFi/vCard. Local, free.

Pay-per-call US brand evidence and signal workflows with free MCP discovery and x402 payments.

Pay-per-call compliance lead scanners with free MCP discovery and x402 payments.

Real 3D-print slicing, quoting, DFM, orientation & material/settings advisors. Free personal tier.

Pay-per-call Apify Store analytics with free MCP discovery and x402 payments.

Pay-per-call lead intelligence tools with free MCP discovery and x402 payments.

Verify your agent's x402 payment flow for free on Base Sepolia testnet before real money moves.

8 pay-per-call web intel tools over MCP. Free discovery, calls settle in USDC on Base (x402).

Pre-signature x402 payment-risk oracle. AI agents call forecast_payment before paying a counterparty and get a GO / HOLD / STOP verdict from settlement reputation, price-anomaly (quoted vs the payee's own median), and OFAC sanctions screening — plus a third-party-verifiable Ed25519 signed receipt. Verdict only; never takes custody. Free under $10 at risk; returns an x402 payment challenge over that.

Agent-native helpdesk. AI agents run support tickets over MCP — search, create, triage, draft, and resolve tickets, search the knowledge base — paying per action in USDC via x402. Read tools are free; priced tools return HTTP 402 with payment terms.

EN 16931-compliant e-invoices: XRechnung, ZUGFeRD, Factur-X, Peppol BIS, Facturae or US PDF. Free.

Curated audio-news MCP server. Search trending articles, fetch narrated audio, subscribe topic feeds. OAuth 2.1 + RFC 7591 DCR. Free tier; premium briefings via x402 with stablecoin settlement.

An accounting engine your AI connects to over MCP. Hand it bank and card statements, invoices, bills and receipts; get reconciled double-entry books with every number traceable to the page it came from. Requires a host that can reach files on your machine — Claude Code, Codex, Cursor, Grok Build, or Claude Desktop + Cowork. Browser chat can install it but cannot send files. Open beta; first 1,000,000 tokens free.

AI-native CRM. 37 tools: pipeline, leads, health scores, GDPR rights. EU-hosted, free tier.

Give your AI coding assistant a backend to deploy to. WiseWall turns a static site into a real product — magic-link accounts, a per-member database, Polar-powered payments, and a server-side paywall — and this package lets your coding agent drive all of it: deploy, configure a custom domain and DNS, manage secrets, create plans, without ever opening a dashboard.

Let your AI send invoices and take payment — card or ACH. Free.