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Order endpoints (/api/v1/orders, /api/v1/simpleOrders/*) require an API key passed in the x-api-key request header. 
curl -H "x-api-key: YOUR_API_KEY" https://api.vatic.trading/api/v1/orders?walletId=...
Price, market, fee, and history endpoints are public — no authentication required.

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Wallet IDs

Order endpoints also require a walletId (a UUID from the user_trading_wallets table). This identifies which of your Polymarket trading wallets to use for signing and submitting orders. The walletId must belong to your API key’s user account and must be fully provisioned (allowances_ready = true, clob_api_key set).