"Free PostgreSQL Database Solutions" matching MCP connectors:
Matching Connector Tools:
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
Check an MCP endpoint resolves: liveness, live tool list, schema drift. Free.
JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)
Create hosted mock REST APIs as tools: seed fake data, import specs, query, write, snapshot. Free.
Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.
Free *.pntr.dev dev subdomains — register subdomains, manage DNS and wildcard records, receive email on disposable inboxes, and capture HTTP requests for webhook debugging. OAuth sign-in; free tier.