How does the success rate calculation work?

The `get_pull_success_rate` tool uses binomial probability and cumulative distribution functions, accounting for both soft pity thresholds and hard pity limits.

Can I estimate how much money I need to spend?

Yes, use the `estimate_budget_requirement` tool. It provides both an expected cost and a worst-case scenario based on your current pity state.

Does this account for 50/50 mechanics?

Yes, you can specify if you are currently in a 'fiftyFifty' or 'guaranteed' state when using the calculation tools.

Loot Box Expectation Calculator MCP Connector for Claude

A+

Calculate gacha success probabilities, expected costs, and bad luck streak risks.

3 tools Official Updated Oct 1, 2026 Official Vinkius Partner

More Details Connect to Claude

An analytical tool for gacha game players to quantify the probability of obtaining specific characters. Use get_pull_success_rate to estimate your chances within a set number of pulls, estimate_budget_requirement to plan your spending in USD or EUR, and analyze_bad_luck_streak to understand the statistical likelihood of consecutive 50/50 losses.

gachapity-systemprobabilitybudgetinggaming-tools

Connect to Claude

Subscribe on Vinkius, then add this connector to Claude.ai or Claude Code.

① Claude.ai (web app)

Go to Settings → Connectors → Add custom connector
Paste the MCP endpoint URL below

https://edge.vinkius.com/vk_preview_UdyI1nOnoiilWmVYq6cGoqV7Dd2HzZrrlotLaxZR/mcp

② Claude Code (terminal)

claude mcp add --transport http loot-box-expectation-calculator https://edge.vinkius.com/vk_preview_UdyI1nOnoiilWmVYq6cGoqV7Dd2HzZrrlotLaxZR/mcp

③ Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "loot-box-expectation-calculator": {
      "url": "https://edge.vinkius.com/vk_preview_UdyI1nOnoiilWmVYq6cGoqV7Dd2HzZrrlotLaxZR/mcp"
    }
  }
}

Get full access on Vinkius

The preview token above works for testing. Powered by Vinkius.

Details

Tools: 3
Grade: A+
Score: 100/100
Updated: Oct 1, 2026

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