Merge pull request #2394 from DefiLlama/polymarket-fees

add polymarket fees

Author: dtmkeng

fees/polymarket.ts

@@ -0,0 +1,50 @@
+import { log } from "console"
+import { FetchOptions, FetchResultV2, SimpleAdapter } from "../adapters/types"
+import { CHAIN } from "../helpers/chains"
+
+const ctf_contract_address = '0x4d97dcd97ec945f40cf65f87097ace5ea0476045'
+const neg_risk_adaptor_contract_address = '0xd91e80cf2e7be2e162c6513ced06f1dd0da35296'
+
+const event_ctf_payout_redeemed = 'event PayoutRedemption(address indexed redeemer,address indexed collateralToken,bytes32 indexed parentCollectionId,bytes32 conditionId,uint256[] indexSets,uint256 payout)';
+const event_neg_risk_adaptor_payout_redeemed = 'event PayoutRedemption(address indexed redeemer,bytes32 indexed conditionId,uint256[] amounts,uint256 payout)';
+
+
+const fetchFees =  async (options: FetchOptions): Promise<FetchResultV2> => {
+  const logs_ctf_payout_redeemed = await options.getLogs({
+    target: ctf_contract_address,
+    eventAbi: event_ctf_payout_redeemed,
+  })
+
+  const logs_neg_risk_adaptor_payout_redeemed = await options.getLogs({
+    target: neg_risk_adaptor_contract_address,
+    eventAbi: event_neg_risk_adaptor_payout_redeemed,
+  })
+
+  const payout = options.createBalances()
+  logs_ctf_payout_redeemed.forEach((log) => {
+    payout.add(log.collateralToken, log.payout)
+  })
+
+  logs_neg_risk_adaptor_payout_redeemed.forEach((log) => {
+    payout.addUSDValue(Number(log.payout)/1e6)
+  })
+
+  payout.resizeBy(1/0.98)
+  const dailyFees = payout.clone()
+  dailyFees.resizeBy(0.02)
+  return {
+    dailyFees
+  }
+}
+
+const adapter: SimpleAdapter = {
+  version: 2,
+  adapter: {
+    [CHAIN.POLYGON]: {
+      fetch: fetchFees,
+      start: '2020-09-30',
+    }
+  },
+}
+
+export default adapter