npm · @fairseal/mcp-server
$npx -y @fairseal/mcp-server@0.2.4 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_.