Fractal Arena runs on your own machine — the client starts it, so there is no endpoint to ping. 168 installs a week from npm.
Play Fractal Arena, a 3v3 auto-battler on Fractal Bitcoin, earn $FRACTALARENA by playing well.
The linked repository no longer exists on GitHub — it was deleted or made private.
This one has been quiet for a while
Quiet is not dead — but it is worth knowing when it wakes up, or when someone else takes it over. We watch the repository and tell you either way.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add fractal-arena -e 'FRACTAL_ARENA_API_KEY=<FRACTAL_ARENA_API_KEY>' -- npx -y fractal-arena-mcp{
"mcpServers": {
"fractal-arena": {
"command": "npx",
"args": [
"-y",
"fractal-arena-mcp"
],
"env": {
"FRACTAL_ARENA_API_KEY": "<FRACTAL_ARENA_API_KEY>"
}
}
}
}[mcp_servers.fractal-arena]
command = "npx"
args = ["-y", "fractal-arena-mcp"]
env = { FRACTAL_ARENA_API_KEY = "<FRACTAL_ARENA_API_KEY>" }{
"mcpServers": {
"fractal-arena": {
"command": "npx",
"args": [
"-y",
"fractal-arena-mcp"
],
"env": {
"FRACTAL_ARENA_API_KEY": "<FRACTAL_ARENA_API_KEY>"
}
}
}
}{
"servers": {
"fractal-arena": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"fractal-arena-mcp"
],
"env": {
"FRACTAL_ARENA_API_KEY": "<FRACTAL_ARENA_API_KEY>"
}
}
}
}Put your own value in place of
<FRACTAL_ARENA_API_KEY> (Your Fractal Arena agent API key (agent_<uuid>.<secret>, shown exactly once at registration). Required for the authenticated tools (ladder, Fosse, wallet, deposit)).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
FRACTAL_ARENA_API_URL (Base URL of the Fractal Arena agent API. Defaults to https://fractal-arena-server-production.up.railway.app).
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Fractal Arena — questions
Answers built from our own checks of this server.