Verifiable entropy, provably-fair games, and receipt verification for AI agents (FairSeal API).
Connect Runs on your machine
claude mcp add mcp-server -e FAIRSEAL_API_KEY=<FAIRSEAL_API_KEY> -e FAIRSEAL_API_URL=<FAIRSEAL_API_URL> -e FAIRSEAL_NOTARY_API_KEY=<FAIRSEAL_NOTARY_API_KEY> -e FAIRSEAL_ANCHOR_API_KEY=<FAIRSEAL_ANCHOR_API_KEY> -- npx -y @fairseal/[email protected]{
"mcpServers": {
"mcp-server": {
"command": "npx",
"args": [
"-y",
"@fairseal/[email protected]"
],
"env": {
"FAIRSEAL_API_KEY": "<FAIRSEAL_API_KEY>",
"FAIRSEAL_API_URL": "<FAIRSEAL_API_URL>",
"FAIRSEAL_NOTARY_API_KEY": "<FAIRSEAL_NOTARY_API_KEY>",
"FAIRSEAL_ANCHOR_API_KEY": "<FAIRSEAL_ANCHOR_API_KEY>"
}
}
}
}{
"mcpServers": {
"mcp-server": {
"command": "npx",
"args": [
"-y",
"@fairseal/[email protected]"
],
"env": {
"FAIRSEAL_API_KEY": "<FAIRSEAL_API_KEY>",
"FAIRSEAL_API_URL": "<FAIRSEAL_API_URL>",
"FAIRSEAL_NOTARY_API_KEY": "<FAIRSEAL_NOTARY_API_KEY>",
"FAIRSEAL_ANCHOR_API_KEY": "<FAIRSEAL_ANCHOR_API_KEY>"
}
}
}
}{
"servers": {
"mcp-server": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@fairseal/[email protected]"
],
"env": {
"FAIRSEAL_API_KEY": "<FAIRSEAL_API_KEY>",
"FAIRSEAL_API_URL": "<FAIRSEAL_API_URL>",
"FAIRSEAL_NOTARY_API_KEY": "<FAIRSEAL_NOTARY_API_KEY>",
"FAIRSEAL_ANCHOR_API_KEY": "<FAIRSEAL_ANCHOR_API_KEY>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
FAIRSEAL_API_KEYOptional, 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… |
FAIRSEAL_API_URLOptional | Upstream API base URL (default https://api.fairseal.io). |
FAIRSEAL_NOTARY_API_KEYOptional, 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_KEYOptional, secret | Key override for Anchor API v2 only (POST /v2/anchor). Falls back to FAIRSEAL_API_KEY if not set. Key prefix: anck_. |
Details
| Package | @fairseal/[email protected] (NPM, stdio) |
| First published | 30 Sep 2026 |
| Last updated | 30 Sep 2026 |
| Registry name | io.fairseal/mcp-server |
More ai and media servers See all
Listing data from the official MCP registry. Status and tools from NestDaddy's daily check. Browse all MCP servers.