When to Use

Use this tool when you need to get organized list of available fields for customizing search results.

this tool provides a list of available fields that can be used to customize the results of other search tools. the fields are organized into categories.

input:

• category: an optional string to specify a category of fields to return. if not provided, all categories and default fields will be returned. example: 'conditions'. This is part of the Clinical Trials provider on xpay✦.

MCP Connection

Connect to xpay✦ to access this tool (and 11+ others):

{
  "mcpServers": {
    "xpay": {
      "url": "https://mcp.xpay.sh/mcp?key=YOUR_API_KEY"
    }
  }
}

For Claude Code:

claude mcp add --transport http xpay "https://mcp.xpay.sh/mcp?key=YOUR_API_KEY"

How to Execute

Use the xpay✦ meta-tools to run this tool:

1. xpay_details — Get full input schema: xpay_details("clinical-trials/get_available_fields")
2. xpay_run — Execute: xpay_run("clinical-trials/get_available_fields", { ...inputs })

Input Parameters

Pricing

• Cost: $0.01/call
• Balance check: Use xpay_balance to check remaining credits
• Get your API key at xpay.tools — $5 free credits included

Related Skills

• Clinical Trials (all tools) — 12 tools
• Search Trials By Condition — $0.01/call
• Search Trials By Intervention — $0.01/call
• Search Trials By Sponsor — $0.01/call
• Search Trials By Acronym — $0.01/call
• Search Trials By Nct Ids — $0.01/call

Links

• Tool page: https://xpay.tools/clinical-trials/get-available-fields/
• Provider: https://xpay.tools/clinical-trials/
• All tools: https://xpay.tools/explore