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Polymarket Guard

evidai/agent-payment-mcp

Gives Claude direct access to Polymarket's prediction markets through LemonCake's pay-per-call billing layer. You can buy and sell positions in real-money prediction markets using USDC, settled on-chain via ERC-2612 permits. Sign once for 90 days with a daily spending cap, and the agent can autonomously trade on events without holding your funds or prompting for signatures on every call. Built on the same infrastructure as LemonCake's other trading MCPs (xstocks, Alpaca, Dinari). Useful when you want an agent to take positions based on research, news analysis, or portfolio rebalancing logic without manually executing each trade or worrying about runaway spending.

auth
Secret needed
transport
STDIO
env vars
2
last updated
May 16, 2026
View on GitHub

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Configuration

POLYMARKET_PRIVATE_KEYsecret

Polygon wallet private key for trading. Leave unset for read-only mode.

LEMON_CAKE_BUYER_JWTsecret

LemonCake Buyer JWT for pay-per-call billing.

Readme

🍋 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.

License: MIT (SDK) Open core MCP Compatible x402 native npm: agent-payment-mcp FSA-confirmed Glama score

View the full README on GitHub

Details

Repository
github.com/evidai/agent-payment-mcp
Categories
AI & LLM Tools, Finance & Commerce
Package
polymarket-guard-mcp
Transport
STDIO
Auth
Required
Registry
MCP registry, active

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