MCP Server Kalshi

- Discovery—list_markets,get_market,list_events,get_event,list_series,get_series. (Kalshi has no free-text search;list_marketsfilters are the search.)
- Research—get_market_orderbook,get_market_candlesticks,get_market_trades.
- Deep rules—get_market_rulesconsolidates a market'srules_primary/rules_secondary, early-close conditions, settlement sources, and series prohibitions;fetch_rules_pdfdownloads and extracts the text of the actual legal contract PDF so the agent can read it.
- Exchange—get_exchange_status,get_exchange_schedule(is the market open, and its hours).
- Portfolio—get_balance,get_positions,get_fills,get_settlements.
- Trading—create_order,cancel_order,amend_order,decrease_order, pluslist_orders/get_order.

- The server targets Kalshi'sdemo (sandbox)environment unless you explicitly setKALSHI_ENV=prod.
- Order-placing tools (create_order,amend_order) requireconfirm=true. Without it they return apreview— a human-readable summary and the exact payload — and place nothing.
- Credentials areoptional: all market/rules tools work unauthenticated. Only portfolio and order tools need an API key + RSA private key.

Kalshi's V2 order API quotes everything from the YES leg (bid/askin fixed-point dollars). This server exposes the natural model instead —action(buy/sell) +side(yes/no) + a wholecentslimit price — and translates it (including the buy-NO ⇄ sell-YES price inversion).

See.env-example. Get API credentials atdocs.kalshi.com/getting_started/api_keysand a demo account via thedemo environment guide.

"mcpServers": { "kalshi": { "command": "uvx", "args": ["mcp-server-kalshi"], "env": { "KALSHI_ENV": "demo", "KALSHI_API_KEY": "<YOUR KALSHI API KEY>", "KALSHI_PRIVATE_KEY_PATH": "PATH TO YOUR RSA KEY FILE" } } }

"mcpServers": { "kalshi": { "command": "docker", "args": ["run", "--rm", "-i", "--mount", "type=bind,src=/Users/username,dst=/Users/username", "-e", "KALSHI_ENV", "-e", "KALSHI_API_KEY", "-e", "KALSHI_PRIVATE_KEY_PATH", "mcp-server-kalshi"], "env": { "KALSHI_ENV": "demo", "KALSHI_API_KEY": "<YOUR KALSHI API KEY>", "KALSHI_PRIVATE_KEY_PATH": "PATH TO YOUR RSA KEY FILE" } } }

- Create a.envfile (see.env-example).
- Install deps:uv sync(add--extra devfor dev tools). Requires Python 3.10+.
- Run:uv run start.
- Test:uv run pytest.

npx @modelcontextprotocol/inspector uv --directory /path/to/mcp-server-kalshi run start

uv sync --extra dev # install dev tools (ruff, mypy, pytest, ...) uv run pytest # run the test suite uv run pytest --cov # tests with a coverage report uv run ruff check src tests # lint uv run black src tests # format (add --check to verify only) uv run mypy # type check uv run pre-commit install # (once) run ruff + black on every commit

Tests are pure/offline — they exercise the order translation and confirm-gate, the HTTP client (via an injectedhttpx.MockTransport), the MCP tool registry, config, and PDF extraction, all without touching the live Kalshi API. CI (.github/workflows/ci.yml) runs ruff + black + mypy + pytest across Python 3.10–3.13 on every push/PR, and releases are gated on that same suite.

Requests are signed with RSA-PSS (MGF1-SHA256, max salt). Each authenticated request sendsKALSHI-ACCESS-KEY,KALSHI-ACCESS-TIMESTAMP, andKALSHI-ACCESS-SIGNATURE, where the signed message istimestamp_ms + METHOD + path(path includes/trade-api/v2, excludes the query string).

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