FairSeal MCP

An MCP server that provides cryptographic receipt verification, provably fair game outcomes, and verifiable entropy for AI agents. It allows agents to create commitments, resolve outcomes using public beacons, and verify receipts to ensure agent decisions and game results are tamper-evident and independently auditable.

Visit FairSeal

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Vendor evidenceLocal stdioSource reviewed; not executedOperated by FairSeal

Vendor documentation

What you can do with it

Verify cryptographic receipts for AI agent decisions
Generate provably fair game outcomes using public entropy
Create pre-commitment hashes for agent actions
Anchor receipts on the Base blockchain for immutability

Source and maintenance

Vendor evidenceRegistry 0.2.4

mcp-registry: io.fairseal/mcp-server@0.2.4 mcp-registry: io.github.ned-del/fairseal-mcp-server@0.1.3 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@fairseal/mcp-server 0.2.4

npm

@fairseal/mcp-server package definition

{
  "version": "0.2.4",
  "transport": "stdio",
  "identifier": "@fairseal/mcp-server",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "FAIRSEAL_API_KEY",
      "description": "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."
    },
    {
      "name": "FAIRSEAL_API_URL",
      "description": "Upstream API base URL (default https://api.fairseal.io)."
    },
    {
      "name": "FAIRSEAL_NOTARY_API_KEY",
      "description": "Key override for the notary service only (POST /v1/notarize). Falls back to FAIRSEAL_API_KEY if not set. Key prefix: fsn_."
    },
    {
      "name": "FAIRSEAL_ANCHOR_API_KEY",
      "description": "Key override for Anchor API v2 only (POST /v2/anchor). Falls back to FAIRSEAL_API_KEY if not set. Key prefix: anck_."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

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Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "fairseal-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@fairseal/mcp-server@0.2.4"
      ],
      "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>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "fairseal-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@fairseal/mcp-server@0.2.4"
      ],
      "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>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "fairseal-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@fairseal/mcp-server@0.2.4"
      ],
      "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>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "fairseal-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@fairseal/mcp-server@0.2.4"
      ],
      "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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