MCP.Market

Polymarket Guard MCP server

by evidai·io.github.evidai/polymarket-guard·v0.1.0·3 stars
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Polymarket prediction markets — buy/sell positions in USDC. LemonCake pay-per-call billing.

B72/100grade B
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Safety scan
B72/100

full report

Adoption
New

3 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

Polymarket Guard tools (11, 4 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • cancel_orderwrite action

    Cancel an open limit order by order ID. Requires POLYMARKET_PRIVATE_KEY. Billed at $0.10 USDC via LemonCake.

  • get_balance

    Get your USDC balance and token allowances on Polymarket's Polygon contracts. Requires POLYMARKET_PRIVATE_KEY. Billed at $0.05 USDC via LemonCake.

  • get_market

    Get full details for a single Polymarket market by its condition ID or slug. Includes resolution criteria, outcomes, current prices, and volume. Free — no billing.

  • get_order_bookwrite action

    Get the live order book (bids and asks) for a Polymarket market token. Use token_id from list_markets or get_market. Free — no billing.

  • get_positions

    Get your current open positions on Polymarket: market titles, outcome tokens, shares held, cost basis, and current P&L. Requires POLYMARKET_PRIVATE_KEY. Billed at $0.05 USDC via LemonCake.

  • get_trade_history

    Get your past trades on Polymarket: order IDs, market, outcome, price, size, timestamp. Requires POLYMARKET_PRIVATE_KEY. Billed at $0.05 USDC via LemonCake.

  • list_markets

    List active Polymarket prediction markets. Returns market titles, condition IDs, token IDs, volume, and YES/NO prices. Free — no billing.

  • place_limit_orderwrite action

    Place a limit order to buy or sell outcome shares at a specific price on Polymarket CLOB. Requires POLYMARKET_PRIVATE_KEY. Billed at $0.10 USDC via LemonCake.

  • place_market_orderwrite action

    Buy or sell outcome shares at market price on Polymarket. USDC cost is calculated at the current best ask/bid. Requires POLYMARKET_PRIVATE_KEY. Billed at $0.10 USDC via LemonCake.

  • redeem_positions

    Claim winnings from resolved Polymarket markets. Redeems outcome token shares for USDC if the market resolved in your favor. Requires POLYMARKET_PRIVATE_KEY. Billed at $0.10 USDC via LemonCake.

  • search_markets

    Search Polymarket markets by keyword. Searches market titles and descriptions. Free — no billing.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings
  • Code scan3 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 102 days ago8/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 72/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Polymarket Guard compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
72/100
higher than 38% of 48,255 servers
Tools
11
the typical server has 7
Tools that change things
36%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
3
more than 80% of 28,688 servers

What its tools let an agent do: 7 read · 3 change · 1 delete

Install Polymarket Guard in Claude Code, Cursor or VS Code

Runs npx -y polymarket-guard-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add polymarket-guard -- npx -y polymarket-guard-mcp
Add to Cursor

What the publisher says

From the Polymarket Guard repository's README, as published. We do not edit it. Read it on GitHub

🍋 LemonCake

The billing, budget & identity layer for software for agents. Private Beta · Open core

Monetize any MCP/API in minutes, and let AI agents pay for it safely — each agent gets a spend-capped identity (budget, usage, pause/revoke). Buyers pay by card; no crypto wallet. First 3,000 calls free (lifetime). Then 3% only when your API earns.

-green.svg)

🚀 Get started · 💲 Pricing · 📚 Docs · 🌐 Live

☝️ A real AI agent buys API calls by itself ($0.01 each), stops at its cap, and the API owner earns — no human, no crypto. · demo source

🚀 Get started

Monetizing an MCP/API? Start here — one command:

npx create-lemon-mcp my-paid-mcp     # a paid MCP server, running in sandbox now
# then add a Seller Key in /app and set LEMONCAKE_SELLER_KEY → it charges for real (no code change)

Pick your path:

Buyer-side MCP — try in 30 seconds

npx -y agent-payment-mcp
{ "mcpServers": { "lemon": { "command": "npx", "args": ["-y", "agent-payment-mcp"] } } }

Ask your agent to run listdemos / calldemo. To call paid APIs, set LCPAYTOKEN (get one at lemoncake.xyz/app).

What is LemonCake?

LemonCake is an x402 payment rail for monetizing MCP servers and HTTP APIs. Sellers register an endpoint and set a price per call. Buyers prepay by card and receive a spend-capped Pay Token. Agents call the gateway with that token, and LemonCake verifies, meters, forwards, and records usage.

sequenceDiagram
    participant A as 🤖 AI Agent
    participant G as 🍋 LemonCake Gateway
    participant API as Your API
    A->>G: POST /g/:id (no token)
    G-->>A: 402 + accepts[] (price, mintUrl)
    A->>G: mint Pay Token (off-session, capped)
    A->>G: Bearer :jwt
    G->>API: forward (upstream key hidden)
    API-->>A: 200 + result
    Note over A,G: budget exhausted → 402 → agent self-funds → continues

Sellers register any HTTP API and set a price per call. Buyers / agents prepay with a card → Pay Token issued automatically → agent calls the API within budget. Budget exhausted → 402 challenge → agent self-funds → continues. No humans.

🧱 Open core

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Polymarket Guard: common questions

Is Polymarket Guard MCP server safe?
Mostly: it is graded B (72/100). Read the Polymarket Guard safety report
How do I install Polymarket Guard?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Polymarket Guard need an API key?
Yes. The registry entry asks for POLYMARKET_PRIVATE_KEY, LEMON_CAKE_BUYER_JWT.
Is Polymarket Guard maintained?
The last commit was 139 days ago (2026-06-17). The latest release is v0.1.0.
What can I use instead of Polymarket Guard?
Servers from other publishers that do the same job: CCXT MCP server.
How does Polymarket Guard compare with other MCP servers?
safety score 72/100 (higher than 38% of 48,255 servers); tools 11 (the typical server has 7); tools that change things 36% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Polymarket Guard

Same job from other publishers: the closest match first, then the best rated.

  • CCXT
    Official CCXT MCP server - Market data and trading across 100+ exchanges and prediction markets
    A

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