# @fairseal/mcp-server

MCP server for FairSeal — verifiable entropy, provably-fair games, and cryptographic receipt verification for AI agents (stdio transport).

- **Type:** MCP server
- **Trust:** 60/100 (B), scored on the package rubric
- **Verification:** community-indexed — nobody has claimed this listing
- **Version:** 0.2.3
- **Author:** FairSeal
- **License:** MIT
- **npm:** @fairseal/mcp-server
- **Source:** https://github.com/ned-del/fairseal
- **Compatible clients:** claude-code, cursor, copilot, gemini (basis: transport)

## Trust

60/100 (B), scored on the package rubric
- Publisher verified: no
- Install scripts: nothing suspicious found
- Prompt-injection scan: not run
- Obfuscation scan: not run
- Evidence age: 34 days

## Security scan

- **Status:** clean
- **Scanned:** 2026-09-01T10:02:58.063Z
- **Version scanned:** 0.1.3
- **CVEs:** none found by OSV at scan time

## Tools

13 declared. Statically extracted from the shipped source — a floor on the surface, not a census.
- `fairseal_entropy` — Fetch raw verifiable entropy from the latest resolved VDF epoch at api.fairseal.io. Read-only. [requires FAIRSEAL_API_KEY]
- `fairseal_games_catalog` — List available provably-fair games (sicbo, dice, gacha, slots) with bet types and endpoints. Read-only.
- `fairseal_stats` — FairSeal entropy engine statistics. Read-only. [requires FAIRSEAL_API_KEY]
- `fairseal_recent_games` — List recently resolved games (useful to find game_ids to verify). Read-only.
- `fairseal_game_result` — Fetch the result of a game by game_id (poll until resolved). Read-only.
- `fairseal_verify_game` — Verify the fairness of a completed game. Returns VDF proof data and replay steps for independent verification. Read-only.
- `fairseal_rng_generate` — Request raw verifiable random number generation (resolves after next VDF epoch, ~5s). Returns a poll URL / game_id. [requires FAIRSEAL_API_KEY]
- `fairseal_sicbo_bet` — Place a three-dice Sic Bo bet. Outcomes provably fair via VDF. Resolves after next epoch (~5s); use fairseal_game_result to poll.
- `fairseal_dice_bet` — Place a two-dice bet (exact/over7/under7/odd/even). Resolves after next epoch (~5s).
- `fairseal_gacha_pull` — Pull a weighted loot box (standard or premium pool). Provably fair via VDF.
- `fairseal_slots_spin` — Spin the 5-reel 3-row slot machine with wild substitution. Provably fair via VDF.
- `fairseal_anchor_submit` — PREVIEW STUB of the future Anchor API v2 (POST /v2/anchor). Simulates queuing a commitment hash for Merkle-batch anchoring to Base. No payment, no chain writes.
- `fairseal_anchor_status` — PREVIEW STUB of the future Anchor API v2 (GET /v2/anchor/{id}). Each poll advances the simulated lifecycle: queued → batched (Merkle proof) → anchored (simulate

## Install

**Verdict: review** — Installable, but 1 thing to check first: No publisher has proved control of this listing; it is indexed, not vouched for.
**Cautions** (coverage gaps and advisories — never blocking)
- No publisher has proved control of this listing; it is indexed, not vouched for.
**Config** (claude-code):
```json
"{\n  \"mcpServers\": {\n    \"mcp-server\": {\n      \"command\": \"npx\",\n      \"args\": [\n        \"-y\",\n        \"@fairseal/mcp-server\"\n      ],\n      \"env\": {\n        \"FAIRSEAL_API_KEY\": \"<YOUR_FAIRSEAL_API_KEY>\"\n      }\n    }\n  }\n}"
```
**Credentials it will ask for** (names only — Forge never holds a value):
- `FAIRSEAL_API_KEY` — Fairseal API Key (optional)
Placeholders only. Forge never holds, brokers, or transmits a credential value — replace each <YOUR_NAME> in your own config file. Do not send a value back to Forge; no Forge endpoint accepts one.
- This entry needs 1 credential (0 required). The generated config carries placeholders, so it will fail in the editor rather than at runtime if they are left unset.

## Blast radius

Moderate blast radius — holds an api key; runs on your machine.
- Floor 23, ceiling 23 (tier: moderate)
- This is impact, not likelihood. A high radius is not a defect: a filesystem server is supposed to write files. It is never part of the trust score.

## Machine-readable views of this entry

- Signed JSON: https://forgeregistry.com/api/v1/packages/%40fairseal%2Fmcp-server
- Install plan: https://forgeregistry.com/api/v1/packages/%40fairseal%2Fmcp-server/install-plan
- Alternatives: https://forgeregistry.com/api/v1/alternatives/%40fairseal%2Fmcp-server
- HTML page: https://forgeregistry.com/registry/%40fairseal%2Fmcp-server
- MCP: POST https://forgeregistry.com/api/mcp → `forge_get_package` / `forge_install_plan`

## About this document

Generated by Forge (https://forgeregistry.com) — a compact rendering of the same record served, signed, at the JSON URL above. Trust and scan facts are the registry's own measurements; anything Forge did not measure is named as unmeasured rather than omitted.