Developer builds one-click Polymarket copy trading using MetaMask EIP-712 signing

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A developer has launched WhaleTrack, a free tool that enables one-click copy trading on the prediction market platform Polymarket without requiring users to expose their private keys. The system uses a three-step architecture: the backend fetches unsigned order parameters, MetaMask signs the order client-side using EIP-712 typed data, and the backend then proxies the request to Polymarket's CLOB API using HMAC-SHA256 authentication. This approach addresses a common security risk in similar tools, where private keys are stored server-side. Users can replicate a whale's bet on Polymarket in under 60 seconds by connecting via MetaMask or a Polymarket API key. The project is available at whaletrack.app and requires no signup, with the developer seeking architectural feedback from the community.

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