Redeem winning Polymarket position for USDC.e on Polygon.
Requires API key in Authorization header. Rate limited: 10/minute per API key.
For managed wallets: signs and submits server-side, returns tx_hash. For external wallets: returns unsigned_tx for client-side signing (sign locally, then broadcast via POST /api/sdk/wallet/broadcast-tx).
tx_hash.
External wallet: Server returns unsigned_tx for you to sign. The Python SDK handles this automatically with client.redeem().