io.fairseal/mcp-server MCP Server

io.fairseal/mcp-server

Repository Registry

What is the io.fairseal/mcp-server MCP server?

Verifiable entropy, provably-fair games, and receipt verification for AI agents (FairSeal API).

How to install io.fairseal/mcp-server

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

FAIRSEAL_API_KEY
secret
API key for gated tools (fairseal_entropy, fairseal_stats, fairseal_rng_generate, fairseal_notarize_decision, fairseal_anchor_submit). Key prefix: fsn_. Without a key these tools return 401; free tools (game reads, notarize_status, anchor_status) work without any key. x402 micropayment ($0.02 USDC on Base) is an alternative to the key for notarize/anchor.
FAIRSEAL_API_URL
Upstream API base URL (default https://api.fairseal.io).
FAIRSEAL_NOTARY_API_KEY
secret
Key override for the notary service only (POST /v1/notarize). Falls back to FAIRSEAL_API_KEY if not set. Key prefix: fsn_.
FAIRSEAL_ANCHOR_API_KEY
secret
Key override for Anchor API v2 only (POST /v2/anchor). Falls back to FAIRSEAL_API_KEY if not set. Key prefix: anck_.

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

{
  "mcpServers": {
    "mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@fairseal/mcp-server"
      ],
      "env": {
        "FAIRSEAL_API_KEY": "<YOUR_FAIRSEAL_API_KEY>",
        "FAIRSEAL_API_URL": "<YOUR_FAIRSEAL_API_URL>",
        "FAIRSEAL_NOTARY_API_KEY": "<YOUR_FAIRSEAL_NOTARY_API_KEY>",
        "FAIRSEAL_ANCHOR_API_KEY": "<YOUR_FAIRSEAL_ANCHOR_API_KEY>"
      }
    }
  }
}

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