Connect Penny Rounding and your agent gets 3 tools, among them price_band, round_cash_total, rounding_impact. It answers at https://penny-rounding.gumballtools.com/api/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 9 of 9 times since 5 September 2026; the last check, on 17 October 2026, succeeded.
Round cash totals to the nearest nickel correctly — after tax, on the total, cash only.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
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 m Inputs: listPrice, taxRatePercent, rule, spreadCents |
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" questio Inputs: 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 q Inputs: prices, taxRatePercent, rule |
Every block below points at https://penny-rounding.gumballtools.com/api/mcp. Pick your client and copy.
claude mcp add --transport http penny-rounding https://penny-rounding.gumballtools.com/api/mcp
{
"mcpServers": {
"penny-rounding": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://penny-rounding.gumballtools.com/api/mcp"]
}
}
}{
"mcpServers": {
"penny-rounding": {
"url": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}{
"servers": {
"penny-rounding": {
"type": "http",
"url": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}{
"context_servers": {
"penny-rounding": {
"url": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}{
"mcpServers": {
"penny-rounding": {
"serverUrl": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}{
"mcpServers": {
"penny-rounding": {
"url": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}name: Penny Rounding
version: 0.0.1
schema: v1
mcpServers:
- name: Penny Rounding
type: streamable-http
url: https://penny-rounding.gumballtools.com/api/mcp{
"mcpServers": {
"penny-rounding": {
"httpUrl": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}{
"mcpServers": {
"penny-rounding": {
"type": "http",
"url": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}{
"mcpServers": {
"penny-rounding": {
"url": "https://penny-rounding.gumballtools.com/api/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fpenny-rounding.gumballtools.com%2Fapi%2Fmcp&type=streamable_http&id=penny-rounding&name=Penny%20Rounding
It answered our last check on 17 October 2026 in 791 ms. Over 9 checks since 5 September 2026 it answered 9. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by gumballtools.com and served from penny-rounding.gumballtools.com, the vendor's own domain: https://penny-rounding.gumballtools.com/api/mcp.
3, as returned by the server's own tools/list on 5 September 2026: price_band, round_cash_total, rounding_impact.
It answered our last check on 17 October 2026 in 791 ms. Over 9 checks since 5 September 2026 it answered 9.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://penny-rounding.gumballtools.com/api/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: com.gumballtools. Endpoint host: penny-rounding.gumballtools.com. ARD identifier: urn:air:com.gumballtools:mcp:penny-rounding.
First indexed 5 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.