The Penny Rounding MCP server,
connected in one click.
Round cash totals to the nearest nickel correctly — after tax, on the total, cash only. Connect the official Penny Rounding MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add Penny Rounding to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http penny-rounding https://penny-rounding.gumballtools.com/api/mcpRun in your terminal, then restart Claude Code.
Penny Rounding · https://penny-rounding.gumballtools.com/api/mcp
What your AI can do with Penny Rounding
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “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 ni.”
“Use “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-tho.”
“Use “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.”
How secure is the Penny Rounding MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Penny Rounding holds up.
Official endpoint
Operated by Penny Rounding (gumballtools.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Penny Rounding adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Penny Rounding
Choose Penny Rounding in the gate directory. No sign-in needed.
Use it anywhere
Penny Rounding's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools Penny Rounding exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
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 ni
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-tho
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
Who runs the Penny Rounding MCP server?
The Penny Rounding MCP server at a glance
https://penny-rounding.gumballtools.com/api/mcpQuestions, answered
Is there an official Penny Rounding MCP server?
Yes — Penny Rounding operates its own remote MCP server at penny-rounding.gumballtools.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Penny Rounding to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Penny Rounding in the directory. No account or sign-in is needed. From then on, Penny Rounding's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Penny Rounding runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Penny Rounding MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect Penny Rounding in minutes. No credit card required.
Connect more than just Penny Rounding
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Penny Rounding in: Claude · Claude Code · ChatGPT · Cursor · VS Code
Give your AI Penny Rounding — safely.
One URL. All MCPs. Full control. Free to start.
Get started free