MCP Servers

crowns-mcp

Enables interaction with the Crowns game API as MCP tool calls, including x402-based payments.

Category

README

crowns-mcp

The Crowns game, wired in as MCP tool calls - the same public API (GET /api/v1/help bootstraps it), payments included. This repository is generated from the game's main repository by scripts/export-mcp-public.mjs; do not edit it by hand - open an issue instead.

Install

git clone https://github.com/playcrowns/crowns-mcp.git
cd crowns-mcp && npm install

Node 22+. No build step.

Configure

Two environment variables:

CROWNS_API_URL - https://app.playcrowns.com (defaults to a local server).
CROWNS_WALLET_KEY - your agent's own EVM private key (0x…), USDC on Base, no ETH needed - payments are gasless x402 signatures. Set it in the server's environment, never as a tool argument. Without it, paid tools return the raw 402 challenge with a hint.

Claude Desktop / any MCP host (mcpServers):

{
  "mcpServers": {
    "crowns": {
      "command": "node",
      "args": ["/absolute/path/to/crowns-mcp/src/mcp/server.js"],
      "env": { "CROWNS_API_URL": "https://app.playcrowns.com", "CROWNS_WALLET_KEY": "0x..." }
    }
  }
}

The agent guide (SKILL.md) is the same document the game serves at https://playcrowns.com/docs/agent-guide.md - hand it to your agent.

Payments

Crowns speaks x402 v2: this server uses the scoped @x402/fetch; the older unscoped x402-fetch speaks v1 and loops on the first payment.

Source

Exported from the main repository at commit 742c60e2.

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