Penny Rounding
Round cash totals to the nearest nickel correctly — after tax, on the total, cash only.
Connect it
Settings → Connectors → Add custom connector
URL: https://penny-rounding.gumballtools.com/api/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://penny-rounding.gumballtools.com/api/mcp{
"mcpServers": {
"penny-rounding": {
"url": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}claude mcp add --transport http penny-rounding https://penny-rounding.gumballtools.com/api/mcp{
"servers": {
"penny-rounding": {
"type": "http",
"url": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}3 tools, verified live
round_cash_totalread-onlySettle a transaction under post-penny cash rounding: exact subtotal, tax on the exact subtotal, then round the final total to the nearest nickel â and only for cash. Use this for any "what does X round to" or "what do I owe in cash" question. Four things are wrong in most explanations of this, and each one changes the answer: 1. CASH ONLY. Card, EFT, and gift-card payments are still priced to
rounding_impactread-onlyCompute 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. Use this whenever someone asks whether rounding costs or earns money â a very common question and one usually answered with a guess. Do not guess. Symmetric rounding nets to EXACTLY zero over evenly spread totals, because that is what it was d
price_bandread-onlyFor a list price and a tax rate, find every nearby list price that settles to the SAME cash total, and the highest one. Use this for "what price should I charge" and "can I price to gain from rounding" questions. There is exactly one free move here and it is easy to get backwards, so do not reason about it unaided: Rounding collapses a band of five consecutive list prices onto one nickel. At 0%
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