com.gumballtools/penny-rounding · v0.1.0 · finance-and-payments
Penny Rounding is healthy: it completed an MCP handshake in 959 ms and exposes 3 tools.
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)
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| Users (last 30 days) | 0 |
| Handshake | Healthy |
| Auth needed | None |
| Tool count | 3 |
| Latency | 959 ms |
| Last checked (UTC) | 2026-10-15T21:25:14.035Z |
| Checked (UTC) | Status | Latency | Error |
|---|---|---|---|
| 2026-10-15T21:25:14.035Z | Healthy | 959 | |
| 2026-10-14T19:45:46.139Z | Healthy | 5565 |
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 |
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 |
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 |