Free servers available for testing purposes MCP Connectors

MCP Verification Gate: conformance and disclosure checker for MCP servers A

Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.

Developer Tools Testing & QA Tools API Testing

511

Strale - 290+ API capabilities for AI agents A

290+ quality-scored API capabilities for AI agents across 27 countries via MCP.

Autonomous Agents Monitoring Observability

924

nlqdb — analytical memory for AI agents AOAuth

Analytical memory for AI agents: a real Postgres queried in plain English over MCP. One command.

Databases Knowledge & Memory Search

631

ListingGood MCP A

Get recommended by Amazon's AI. Hosted MCP server for Amazon listing compliance & generation.

E-commerce & Retail Marketing

721

otwarteAPI A

Search otwarteAPI.pl — a catalog of 53 official public Polish and EU APIs (VAT white list, KRS, GUS, NBP, ECB, Eurostat, VIES and more), curated for AI agents. One tool: find the right API by natural-language query. No API key, no signup.

Government Data Open Data Search

11

OrchestKit Docs MCP A

Read-only MCP server for the OrchestKit docs: full-text search + Markdown fetch. No auth.

Documentation Access Search

23186

HORIZON SHIELD: Construction Estimate Auditor for Japan (KIRA)A

Agent intake desk for property renovation. Read only, CORS open, fail closed, receipts recompute.

Finance Open Data Real Estate

521

ClearMarket A

Reference data for prediction markets: graded resolution clarity, cross-venue links, provenance.

Finance Research & Data

623

Agent402.Tools: pay-per-call web tools A

Agentic Finance: 500+ tools for AI agents over x402 or MPP, free via PoW, or prepaid card credits

Agent Orchestration Browser Automation Search

1528

Beamtrace AOAuth

AI visibility tracking & website fixes for better AI search presence

Marketing Research & Data

51

HORIZON SHIELD — construction & renovation estimate auditor A

Independent pre-transaction audit for construction estimates. Free, and every verdict recomputes.

Finance Open Data Real Estate

1421

Corpus Law A

Search and cite US law from official sources, then form an LLC or nonprofit with free agent tools.

Legal & Compliance Government Data

71

Aspicio A

DXF and PDF/X-4 for AI agents: structured facts, PNG renders, an interactive in-chat viewer.

Design Tools Workplace & Productivity

834

AlgoVault — Crypto Quant Trade Calls A

The Brain Layer for AI Trading Agents — quant calls + cross-venue arb across perp venues via MCP.

Finance Cryptocurrency Research & Data

745

PrawMi A

Polish law: search statutes (ISAP), court rulings, verify citations. Free tier + paid plans + x402.

Government Data Legal & Compliance

82

mcp A

Field-service dispatch & technician scheduling for AI agents — sub-3-second cascade rescheduling.

App Automation CRM Project Management

432

Spala Public MCP A

Discovery, OAuth, project operations, and exact project MCP handoff for Spala backend projects.

Developer Tools Security

162

ARADIA | sovereign agentic systems A

Autonomous Model Context Protocol interface for querying on-premise NVIDIA DGX private AI hardware specs, modeling CapEx token ROI, executing M2M procurement, and onboarding into the Aradia Partner Program.

Agent Orchestration AI & Machine Learning Autonomous Agents

41

squirrelscan A

Website QA for your coding agent: audit SEO, performance, security, accessibility over MCP.

Browser Automation Monitoring Web Scraping

182257

x402-data-gateway A

Twenty-two paid x402 and MPP tools for agent discovery, payment safety, data, and DeFi.

Cryptocurrency Web Scraping Agent Orchestration

222

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