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Jackpot Calculator MCP server

online · 100% uptime
by jiankn·io.github.jiankn/jackpot-calculator·v0.1.0
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Estimate US lottery taxes, compare cash and annuity, split pool prizes and calculate jackpot odds.

A91/100grade A
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Safety scan
A91/100

full report

Adoption
Growing

0 stars

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Jackpot Calculator tools (4)

write = sends, deletes, buys or posts
  • calculate_lottery_oddsFree

    Calculate jackpot coverage for distinct combinations in one drawing and optional before-tax expected ticket return.

  • calculate_lottery_payoutFree

    Estimate taxes and withholding on a known lottery cash prize. Input dollars; result integer cents. Bundled 2026 rules.

  • calculate_pool_shareFree

    Estimate one equal member’s cash prize, taxes and withholding. Each member is assumed to have the specified tax profile.

  • compare_lump_sum_annuityFree

    Compare a published cash option with 30 growing annuity payments after taxes, including present value and break-even rate.

Public scan report

scanner v0.1.10 · 2026-10-13 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 1503ms20/20
  • Tool poisoning4 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 0 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 91/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Jackpot Calculator compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
91/100
higher than 85% of 48,255 servers
Tools
4
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
209 ms
faster than 62% of 30,031 servers

What its tools let an agent do: 4 read

Install Jackpot Calculator in Claude Code, Cursor or VS Code

claude mcp add --transport http jackpot-calculator https://jackpot-calculator-mcp.jiankn.workers.dev/mcp
Add to Cursor

What the publisher says

From the Jackpot Calculator repository's README, as published. We do not edit it. Read it on GitHub

Jackpot Calculator MCP

Four read-only MCP tools for US lottery prize taxes, cash vs annuity comparisons, equal pool shares and jackpot probabilities. Calculations use a fixed 2026 data snapshot and the same engine as Jackpot Calculator.

Connect to the hosted server

Add this Streamable HTTP URL in a client that supports remote MCP servers:

https://jackpot-calculator-mcp.jiankn.workers.dev/mcp

No API key is required. The public endpoint allows up to 120 requests per minute per IP at the Cloudflare edge; rate limiting is approximate, not a global quota. Connection examples and output units: Jackpot Calculator MCP setup.

Tools

Money inputs are US dollars. Tax/payout results use integer cents. The odds tool reports money in dollars. Rates and probabilities are fractions, so 0.04 is 4%. Each result states its units, assumptions and related calculator.

Example tool call:

{
  "name": "calculate_lottery_payout",
  "arguments": { "prize": 1000000, "stateCode": "TX", "status": "single" }
}

The bundled 2026 calculation returns an estimated $320,000 final federal tax and $680,000 take-home, separately from $240,000 federal withholding. See the interactive lottery tax calculator to explore other states and filing statuses.

For game-specific cash estimates, select game: "powerball" or game: "megaMillions", provide the known cash prize and compare it with the Powerball payout calculator or Mega Millions tax calculator. For annuities provide both the published cash option and advertised annuity total; the package never guesses the cash option from a fixed percentage.

Run locally from the source or release archive

Node.js 22.12 or newer is required.

git clone https://github.com/jiankn/jackpot-calculator-mcp.git
cd jackpot-calculator-mcp
npm ci
npm test
node src/cli.mjs

The last command starts an MCP stdio server and waits for a client; it is not an interactive CLI prompt. Configure a stdio client with command: "node" and args: ["/absolute/path/to/jackpot-calculator-mcp/src/cli.mjs"]. Only protocol messages go to stdout.

Release archives can also be installed with npm install ./jackpot-calculator-mcp-0.1.0.tgz. An npm registry listing is optional and is not needed for the hosted endpoint.

Calculation boundaries

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Jackpot Calculator: common questions

Is Jackpot Calculator MCP server safe?
Yes, by our scan: it is graded A (91/100). Read the Jackpot Calculator safety report
How do I install Jackpot Calculator?
It runs remotely at jackpot-calculator-mcp.jiankn.workers.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Jackpot Calculator need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Jackpot Calculator maintained?
The last commit was 22 days ago (2026-10-13). The latest release is v0.1.0.
Is Jackpot Calculator up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Jackpot Calculator compare with other MCP servers?
safety score 91/100 (higher than 85% of 48,255 servers); tools 4 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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