The proxy wallet is the address that actually holds a Polymarket account's positions and USDC, distinct from the externally owned account that signs orders. API clients take it as the funder parameter, and it must be set correctly or orders sign as one identity while settling against another.
Accounts created through the Polymarket interface get a proxy wallet automatically; Safe-based smart wallets are a separate arrangement. The signature type sent with an order tells the exchange which arrangement to expect.
Confusing the signing address with the funding address is one of the most common setup failures, and it usually presents as orders being rejected rather than as anything obviously wallet-related.
Passing the signing account as the funder. Orders then sign as one identity and settle against another, which usually surfaces as a rejection with no obvious connection to wallets.
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