"Free servers available for testing purposes" matching MCP tools:

• query_registry

  Arclan MCP Registry

  Search the Arclan registry for MCP servers. By default returns only connectable servers (active, mcp_partial, auth_gated). Use status=stdio to browse local-only servers available for installation. Use status=all to query the full index. Use production_safe=true to restrict to servers with uptime > 97% and handshake success > 95%. Use read_only=true to restrict to servers with no write or exec tools. Use this before connecting to an MCP server to check its validation status and score. After using a server, call report_server to contribute reliability data.

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• check_headers

  ContrastAPI

  Validate HTTP security headers you provide (JSON): CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Permissions-Policy, Referrer-Policy against best practices. Use to test header config before deployment or validate non-public servers; use scan_headers to fetch live. Free: 30/hr, Pro: 500/hr. By default header values are truncated to 500 chars; pass include='full' for the full raw value. Returns {total, by_severity, findings}. No external requests.

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• get_spot_rate

  CurrencyGuard Guard Pricing

  Get an indicative spot FX rate for a currency pair. Returns rounded bid, ask, and mid rates for illustration purposes only — not for execution. Example: base=GBP, quote=USD returns the GBPUSD rate.

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• search_mcp_servers

  agent-tools (x402 + MCP + A2A directory)

  Find MCP servers in the directory. Searches the standalone MCP directory (PulseMCP / official MCP registry import) unioned with x402 services that also expose an MCP endpoint. Returns normalised entries with a ready-to-use streamable-http `call_hint.mcp.url`. Args: intent: Natural-language description of the tool/capability needed. top_k: Max servers to return (1-20). chain: Optional payment-network filter for paid MCP servers. require_healthy: When true, only return servers marked health=ok.

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• cyanheads_search

  cyanheads-mcp-server

  Search fleet tools and servers by natural-language description. Returns ranked matches with brief summaries and the server each tool belongs to. Use scope "servers" to find which server handles a workflow; use the default scope "tools" to find specific tools. Call cyanheads_describe on a result name to get install snippets and the connection URL.

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• check_availability

  Domains

  Check whether a name is available to register across MULTIPLE TLDs at once — the domain-hunting tool. Pass a base name ("acme") and get .com/.io/.ai/.co/.net/.org/.app/.dev checked in one call (or pass your own tlds list). For each: available true/false (+ expiration if taken). Use for "is X available", "find an open domain for my project", "which TLDs is X free on". Single-domain detail is domain_status; this is the bulk/brainstorm version.

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• get_demo_guide

  eDiscovery Decoder News/Calc

  Return a short, human-readable walkthrough for testing this server: the endpoint, the tool/prompt/resource names, and ready-to-paste sample prompts. Use to give someone a guided demo. For the full machine-readable capability catalog, use list_capabilities instead.

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• check_availability

  qasper

  Check available appointment slots for a specific service at a local business on a given date. Returns time windows when the business is free and the service bookingStartPolicy permits the start. For services with maxParticipants > 1, provider-returned starts remain available until capacity is full. ONLY call this if the business has 'booking' in its enabledFeatures array. If the business doesn't support booking, share their contact info from get_business_info instead.

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• get_sector_intelligence

  Stocklake — AI Stock Intelligence

  AI-assessed sector intelligence: signal, cycle stage, rotation signal, drivers, alerts, and computed statistics per sector (RSI distribution, breadth, performance 1W/1M, top/bottom movers, historical percentiles). Pass a sector name for a single sector, or omit the parameter (or pass None) to get the latest assessment for all 11 sectors. Refreshed every ~4 hours by the market intelligence pipeline. Available to pro tier only (AI pipeline costs). For informational purposes only. Not financial advice.

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• search_mcp_servers

  agent-tools (x402 directory)

  Find MCP servers in the directory. Searches the standalone MCP directory (PulseMCP / official MCP registry import) unioned with x402 services that also expose an MCP endpoint. Returns normalised entries with a ready-to-use streamable-http `call_hint.mcp.url`. Args: intent: Natural-language description of the tool/capability needed. top_k: Max servers to return (1-20). chain: Optional payment-network filter for paid MCP servers. require_healthy: When true, only return servers marked health=ok.

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• get_device_ads

  Trillboards DOOH Advertising

  Get current ads scheduled for a device (for testing). WHEN TO USE: - Testing device ad delivery - Debugging which ads are being shown - Verifying ad targeting is working RETURNS: - ads: Array of advertisement objects - default_stream: Default content when no ads - schedule: Current ad schedule EXAMPLE: User: "What ads are showing on device P_abc123?" get_device_ads({ fingerprint: "P_abc123" })

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• strale_getting_started

  Strale - 290+ API capabilities for AI agents

  Lists the free capabilities available without an API key and explains how to get started. Call this on first connection to see what you can do immediately. Returns 5 free capability slugs (email-validate, dns-lookup, json-repair, url-to-markdown, iban-validate) with descriptions, example inputs, and instructions for accessing the full registry of 271 paid capabilities. No API key required.

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• get_infrastructure

  Blueprint Agentic Staking (Solentic)

  Get Blueprint validator infrastructure specs: server hardware, redundancy configuration, network, and storage. Two bare-metal servers (redundant HA).

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• tech_fingerprint

  ContrastAPI

  Detect website technology stack: CMS, frameworks, CDN, analytics tools, web servers, languages (via HTTP headers + HTML analysis). Use for passive reconnaissance; for full audit use audit_domain. Free: 30/hr, Pro: 500/hr. Returns {technologies: [{name, category, confidence%, version}]}.

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• discover

  Robot Speed

  [FREE] See all available free SEO tools and recommended workflows. Call this first. FR: Découvrez les outils SEO gratuits et les workflows recommandés.

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• list_libraries

  Supericons

  List the free icon libraries available through the hosted Supericons MCP server. Use this before filtering by library or when a user asks which icon libraries are supported.

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• list_libraries

  Supericons

  List the free icon libraries available through the hosted Supericons MCP server. Use this before filtering by library or when a user asks which icon libraries are supported.

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• unassign_license

  agentView

  Removes a premium license from a display; the license returns to the account's available pool and the display reverts to the free-tier watermark. Requires admin scope.

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• function_call_validate

  IA-QA — 130+ QA & Dev Tools for AI Agents

  Validate an LLM function call / tool_use output: check that function name is in allowed list, arguments match expected schema, no extra/missing args. For OpenAI function calling & MCP tool_use testing.

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• pentest_generate_payloads

  pentest-mcp-server

  Generate payload templates for authorized testing against systems the tester owns or is permitted to test. Payloads are annotated templates — each includes why it works in the specified context, what vulnerability class it tests, detection signatures that WAF/IDS products might fire, and recommended mitigations. Context-awareness is core: an XSS payload for an HTML attribute differs entirely from one for a JS template literal, and both differ from a DOM-based sink. When a WAF profile is specified, bypass variants reference known public research for that WAF product. All payloads are illustrative templates for authorized testing only.

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