Jackpot Calculator MCP Server

by jiankn Your server? Claim it

answering

Jackpot Calculator is answering right now. Last checked 13 min ago. It exposes 4 tools. Last commit 13 Oct 2026.

Estimate US lottery taxes, compare cash and annuity, split pool prizes and calculate jackpot odds.

Uptime history 72 hours of history

72 hours agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

125 ms

Response time

average over 24h

Stars

last commit 13 Oct 2026

Nothing serious here today

Today is the operative word: we check Jackpot Calculator every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "jackpot-calculator": {
      "url": "https://jackpot-calculator-mcp.jiankn.workers.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.jackpot-calculator]
url = "https://jackpot-calculator-mcp.jiankn.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "jackpot-calculator": {
      "url": "https://jackpot-calculator-mcp.jiankn.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "jackpot-calculator": {
      "url": "https://jackpot-calculator-mcp.jiankn.workers.dev/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

calculate

calculate_lottery_odds

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

calculate_lottery_payout

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

calculate_pool_share

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

compare

compare_lump_sum_annuity

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

Endpoints

URL	Transport	State	Latency	Checked
https://jackpot-calculator-mcp.jiankn.workers.dev/mcp	streamable-http	answering	65 ms	13 min ago

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Jackpot Calculator — questions

Answers built from our own checks of this server.

What can Jackpot Calculator do?

It exposes 4 tools, read directly from the server on our last check. Among them: calculate_lottery_odds, calculate_lottery_payout, calculate_pool_share, compare_lump_sum_annuity. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Jackpot Calculator working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 125 ms. The bar chart above shows every period we have measured.

How do I connect Jackpot Calculator?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Jackpot Calculator need an API key?

No. Jackpot Calculator completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Jackpot Calculator?

It answers our handshake in 125 ms on average, which is faster than 80% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Jackpot Calculator open source?

Yes — it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.