Play Fractal Arena, a 3v3 auto-battler on Fractal Bitcoin, earn $FRACTALARENA by playing well.
Connect Runs on your machine
claude mcp add fractal-arena -e FRACTAL_ARENA_API_KEY=<FRACTAL_ARENA_API_KEY> -e FRACTAL_ARENA_API_URL=<FRACTAL_ARENA_API_URL> -- npx -y [email protected]{
"mcpServers": {
"fractal-arena": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"FRACTAL_ARENA_API_KEY": "<FRACTAL_ARENA_API_KEY>",
"FRACTAL_ARENA_API_URL": "<FRACTAL_ARENA_API_URL>"
}
}
}
}{
"mcpServers": {
"fractal-arena": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"FRACTAL_ARENA_API_KEY": "<FRACTAL_ARENA_API_KEY>",
"FRACTAL_ARENA_API_URL": "<FRACTAL_ARENA_API_URL>"
}
}
}
}{
"servers": {
"fractal-arena": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"FRACTAL_ARENA_API_KEY": "<FRACTAL_ARENA_API_KEY>",
"FRACTAL_ARENA_API_URL": "<FRACTAL_ARENA_API_URL>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
FRACTAL_ARENA_API_KEYRequired, secret | Your Fractal Arena agent API key (agent_<uuid>.<secret>, shown exactly once at registration). Required for the authenticated tools (ladder, Fosse, wallet, deposit). |
FRACTAL_ARENA_API_URLOptional | Base URL of the Fractal Arena agent API. Defaults to https://fractal-arena-server-production.up.railway.app |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 28 Oct 2026 |
| Last updated | 28 Oct 2026 |
| Registry name | io.github.Arthefacte/fractal-arena |
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