Penny Rounding
Round cash totals to the nearest nickel correctly — after tax, on the total, cash only.
| Endpoint | https://penny-rounding.gumballtools.com/api/mcp (streamable-http) |
|---|---|
| Registry version | 0.1.0 |
| Now | 3 tools · grade F (23) · pin ts_47c9cc97626cd874afb7a8773e3989d3 · protocol 2025-06-18 |
| First / last listed | 2026-10-24 21:04 UTC / 2026-10-24 21:04 UTC |
| Grade over time | 2026-10-24: F (23), 3 tools |
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Tools: round_cash_total rounding_impact price_band
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.
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 th params: subtotal, items, taxRatePercent, tender, rule |
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.
Use this whenever someone asks whether rounding costs or earns money — 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 des params: prices*, taxRatePercent, rule |
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.
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% params: listPrice*, taxRatePercent, rule, spreadCents |
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