Polymarket MCP Server
Enables AI agents to browse, search, and trade on Polymarket prediction markets, including viewing markets, order books, balances, and placing/canceling orders.
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The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
polymarket_get_balanceGet the USDC balance and allowance for the configured wallet on Polymarket.
polymarket_get_positionsGet real positions (token holdings) for the configured wallet from Polymarket Data API. Returns actual token balances with P&L, not just open orders. **Parameters:** - redeemable: Filter to only show redeemable (resolved) positions (default: false) - market: Filter by condition ID (optional) - lim…
polymarket_update_allowanceTrigger a refresh of the USDC allowance for trading on Polymarket. Use this when orders fail due to insufficient allowance. This tells the CLOB server to re-check and update the on-chain allowance state.
polymarket_get_marketsList available prediction markets on Polymarket, sorted by volume. Returns market question, current prices for Yes/No outcomes, token IDs, volume, liquidity, and Polymarket URL.
polymarket_get_marketGet detailed information about a specific prediction market including token IDs, current prices, description, liquidity, and market status. Provide one of: condition_id, slug, or a full Polymarket URL (e.g. https://polymarket.com/event/btc-updown-15m-1770647400).
polymarket_get_newsFetch recent news headlines for a topic via Google News RSS. Useful for understanding current events and market context when analyzing prediction markets. No API key required.
polymarket_get_orderbookGet the order book for a specific token showing current bids and asks with prices and sizes.
polymarket_get_tradesGet recent executed trades for the configured wallet.
polymarket_place_orderPlace a limit order on Polymarket. CAUTION: This executes a real trade with real funds. Price must be between 0 and 1, size in shares.
polymarket_place_market_orderPlace a market order on Polymarket for immediate execution. CAUTION: This executes a REAL trade with REAL funds at market price! **Parameters:** - token_id: The token to trade - side: "BUY" or "SELL" - amount: For BUY — USD amount to spend. For SELL — number of shares to sell. - order_type: "FOK" …
polymarket_cancel_orderCancel an existing order on Polymarket.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
When Vitest UI server is listening, arbitrary file can be read and executed
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
11/11 tools missing one or more hints — polymarket_get_balance (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); polymarket_get_positions (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); polymarket_update_allowance (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +8 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Descriptions match behaviour
1 tool describes read intent but its handler mutates — polymarket_get_news (line 44: itemRegex.exec(xml))
Rename the tool, rewrite the description, or move the side-effect into a separate clearly-named tool.
Tool inputs are validated
Only 0/11 tool handlers declare input schemas (0%)
Declare an inputSchema with zod/joi/yup on every tool definition.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tool test coverage
Only 0/11 tools referenced in tests (0%)
Write tests that reference each tool by name so every tool has at least one test.
Production dependencies are patched
0 critical, 1 high severity in production deps — @modelcontextprotocol/sdk@1.25.3 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
1 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
Domain consistency
npm scope @c0pilot doesn't match GitHub owner unsanction
Use the same org name across GitHub, npm, and your homepage so users can verify the publisher.
Tool description accuracy
polymarket_get_news: description implies read-only but handler writes/deletes/executes
Update tool descriptions to accurately reflect all capabilities — especially write, delete, or execute operations.
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