MCP Server

Payload Validator MCP Server

com.gumballtools/payload-validator

What is the Payload Validator MCP server?

Validate JSON, YAML, XML and CSV with exact line/column errors and silent-corruption warnings.

Copy-paste configuration for popular MCP clients.

transport: http

Config generated by PluginBench — verify against the source before use.

~/.cursor/mcp.json

{
  "mcpServers": {
    "payload-validator": {
      "url": "https://payload-validator.gumballtools.com/api/mcp"
    }
  }
}

Round cash totals to the nearest nickel correctly — after tax, on the total, cash only.

One MCP server exposing every tool in the Gumball portfolio.

Explain a regex in plain English and detect catastrophic backtracking risk.

Work an offside call through IFAB Law 11 or NHL Rule 83, step by step.

Convert times between IANA zones and detect skipped or ambiguous DST local times.

Words-in-context vocabulary practice questions with distractor explanations.