Open to agents

What is MCP?

Model Context Protocol is an open standard for connecting LLM clients to external data and tools. GADUIN exposes an MCP endpoint that any MCP-compatible client — Claude Desktop, Claude.ai, custom agents — can connect to with a user-issued API key. Each call is authenticated and scoped to the user who issued the key.

Available tools

The v1 tool catalogue is read-only. Each tool publishes its own input schema; the LLM client wires it automatically — you don't have to hand-roll JSON.

• list_markets

  List open prediction markets on real-world transport outcomes (flight delays, train cancellations, ship-chokepoint throughput). Optional inputs: category (FLIGHT, TRAIN, SHIP), status (defaults to OPEN), limit (1–100). Returns market id, category, question, outcomes with current prices, total volume, and close time.

• get_market

  Fetch a single market by id, including current prices and outcomes. Input: id (market UUID).

• get_my_positions

  List the authenticated user's open positions across all markets. No inputs. Returns market_id, outcome_idx, shares held, and total cost basis.

• get_balance

  Return the authenticated user's current dollar balance, as a string. No inputs.

Trading is REST-only for now

Placing trades, deposits and withdrawals are deliberately not exposed through MCP yet — an MCP-driven trade has higher blast radius than a read, and we want the human in the loop until the UX is proven. Programmatic trading is available through the REST API with a scoped API key.

Connect a client

1. 1.Sign up and verify your account.
2. 2.Generate an API key from your account settings — read scope is enough for MCP.
3. 3.Drop the snippet below into your MCP-compatible client and swap in your key.

{
  "mcpServers": {
    "gaduin": {
      "url": "https://gaduin.com/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

Endpoint reference

Prefer to wire things up directly? The Model Context Protocol endpoint and the anonymous, read-only REST API are below — the same markets, order books, and prices the site and the MCP server serve.

• GET /markets

  List open markets. Filter by category (FLIGHT, TRAIN, SHIP) and status, and page through results with limit and cursor.

• GET /markets/{id}

  Fetch a single market by id, including its settlement rule and evidence.

• GET /markets/{id}/book

  Order-book snapshot for a market.

• GET /markets/{id}/trades

  Recent trades for a market.

• GET /markets/{id}/price-history

  Historical price snapshots for a market.

• GET /markets/positions

  Live aggregate positions across every market.

• GET /markets/config

  Trading bounds — the minimum and maximum trade amount.

• GET /healthz

  Liveness probe.

Machine-readable discovery

Agents don't have to scrape this page. Every capability above is also described in a standards-based document served from the site root, so an MCP- or OpenAPI-aware client can discover the markets, the API, and how to authenticate on its own.

• /.well-known/mcp/server-card.json

  MCP Server Card (SEP-1649) — the Model Context Protocol endpoint, its transport, and how to authenticate.

• /.well-known/openapi.json

  OpenAPI 3.1 description of the anonymous, read-only REST API.

• /.well-known/api-catalog

  API Catalog (RFC 9727) — the linkset that ties every machine-readable surface together.

• /.well-known/oauth-protected-resource

  OAuth 2.0 Protected Resource Metadata (RFC 9728) — which authorization server issues API tokens, and the scopes they carry.

• /.well-known/oauth-authorization-server

  OAuth 2.0 Authorization Server Metadata (RFC 8414) — the issuer, token endpoint, and the API-key-to-token grant.

• /.well-known/agent-skills/index.json

  Agent Skills index — the SKILL.md guides an agent can fetch to learn how to work with the platform, each pinned by digest.

• /api/md

  Markdown rendering of any public page, via content negotiation (send Accept: text/markdown).

• /auth.md

  A human- and agent-readable walk-through of authenticating and minting a scoped API key.