INDIVIDUAL MCP TOOL

price_band

For a list price and a tax rate, find every nearby list price that settles to the SAME cash total, and the highest one.

gumballtools.comnone authenticationAvailability not checked

LIVE ENDPOINT

https://penny-rounding.gumballtools.com/api/mcp

No auth detected

Connect to this endpoint to inspect the live schema for price_band and invoke it with your own arguments.

{}

Inferred read-only · medium confidence · heuristic, not a guarantee.

No write-capable action terms were found; this is not proof that invocation has no side effects.

CONNECT WITH APPROVAL

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.penny-rounding]
url = "https://penny-rounding.gumballtools.com/api/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "penny-rounding": {
      "type": "http",
      "url": "https://penny-rounding.gumballtools.com/api/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: penny-rounding
Remote MCP URL: https://penny-rounding.gumballtools.com/api/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "penny-rounding": {
      "url": "https://penny-rounding.gumballtools.com/api/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "penny-rounding": {
      "type": "http",
      "url": "https://penny-rounding.gumballtools.com/api/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "penny-rounding",
  "transport": "streamable-http",
  "url": "https://penny-rounding.gumballtools.com/api/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

round_cash_total — Settle a transaction under post-penny cash rounding: exact subtotal, tax on the exact subtotal, then round the final total to the nearest nickel — and only for cash.
rounding_impact — Compute what cash rounding is actually worth across a list of prices: mean delta per transaction, the up/down/unchanged split, and a per-thousand figure.