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100
MCP live MCP 2026-07-28 streamable-http

Penny Rounding

com.gumballtools/penny-rounding

Round cash totals to the nearest nickel correctly — after tax, on the total, cash only.

Watch this dependency Share evidence report
Uptime
100.0%
5 direct probes · 30d
Response
1126ms
last probe
Tools
3
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://penny-rounding.gumballtools.com/api/mcp
Score: 100/100
Handshake verified by our own probe.
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
3 tools, 0 resources, 0 prompts returned.
pass 3 or more catalogue items 10/10
3 items in total; 3 or more earns these points.
pass Describes itself 10/10
87 characters; more than 30 earns these points.

Tools · 3

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 rou…

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 roundi…

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 roundin…

How to use

Claude Desktop or claude.ai: add a custom connector (Customize → Connectors; on Team and Enterprise plans an owner adds it under Organization settings → Connectors) with this server URL: https://penny-rounding.gumballtools.com/api/mcp

Cursor or Cline: add to your MCP config:

{
  "mcpServers": {
    "penny_rounding": {
      "url": "https://penny-rounding.gumballtools.com/api/mcp",
      "transport": "streamable-http"
    }
  }
}