Authentication

Layer 3 — Trading

Polymarket Auth Troubleshooting: POLY Headers, Signature Types, and Error Reference

Fix Polymarket API authentication errors. Covers all five POLY_* headers, signatureType values, funder addresses, proxy wallet architecture, and step-by-step debugging.

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Sign-In with Ethereum (SIWE)

Wallet-based authentication standard (EIP-4361) used by Polymarket and dApps. No accounts, no passwords, just wallet signatures.

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