Io.fairseal MCP Server

Io.fairseal is an MCP integration. Verifiable entropy, provably-fair games, and receipt verification for AI agents (FairSeal API).

Packages and local setup

The published npm package is @fairseal/mcp-server, version 0.2.4. Its declared MCP transport is stdio.

The package declares FAIRSEAL_API_KEY: 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: 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: Key override for Anchor API v2 only (POST /v2/anchor). Falls back to FAIRSEAL_API_KEY if not set. Key prefix: anck_..

Before connecting

Check the maintainer’s instructions for account access, authentication and the supported client configuration. Once connected, inspect the tools your client receives and try a small task that matches the server’s stated purpose. The registry description does not include a verified, complete tool list.

Project and source

View the publisher’s registry entry · Project repository · Project website. This profile uses version 0.2.4 from the registry. Registration identifies the publisher namespace; it does not establish that this is a first-party integration for every service it connects.

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