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For a complete walkthrough, see the Fees & Monetization guide.
The policy is scoped to your API key - no userId required. If you have never configured a partner fee, the endpoint returns the default policy: partnerFeeBps: 0. This is not an error.
The Fee Policy API is Polymarket-only. Predict.fun charges an exchange fee that varies by market, applied automatically by the Predict matching engine. There is no configurable platform or partner fee for Predict.
curl -s "https://trade.predexon.com/api/fees/policy?venue=polymarket" \
  -H "x-api-key: YOUR_API_KEY"

{
  "venue": "polymarket",
  "enabled": true,
  "platformFeeBps": 0,
  "partnerFeeBps": 0,
  "partnerTreasuryAddress": null,
  "totalFeeBps": 0
}