track opinion PM fees and volume (#4559)

Author: KPHEMRAJ

dexs/opinion/index.ts

@@ -0,0 +1,46 @@
+import { FetchOptions, FetchResult, SimpleAdapter } from "../../adapters/types";
+import { CHAIN } from "../../helpers/chains";
+
+const OPINION_CONTRACT = "0x5F45344126D6488025B0b84A3A8189F2487a7246";
+const ORDER_FILLED_EVENT = "event OrderFilled (bytes32 indexed orderHash,  address indexed maker,address indexed taker, uint256 makerAssetId, uint256 takerAssetId, uint256 makerAmountFilled, uint256 takerAmountFilled, uint256 fee)";
+
+async function fetch(options: FetchOptions): Promise<FetchResult> {
+    const dailyVolume = options.createBalances();
+    const dailyFees = options.createBalances();
+
+    const orderFilledLogs = await options.getLogs({
+        eventAbi: ORDER_FILLED_EVENT,
+        target: OPINION_CONTRACT
+    });
+
+    orderFilledLogs.forEach((order: any) => {
+        const tradeVolume = Number(order.makerAssetId == 0 ? order.makerAmountFilled : order.takerAmountFilled) / 1e18;
+        dailyVolume.addUSDValue(tradeVolume);
+        dailyFees.addUSDValue(Number(order.fee) / 1e18);
+    });
+
+    return {
+        dailyVolume,
+        dailyFees,
+        dailyRevenue: dailyFees,
+        dailyProtocolRevenue: dailyFees,
+    }
+
+}
+
+const methodology = {
+    Volume: "Opinion prediction market trading volume",
+    Fees: "Taker fees collected by opinion",
+    Revenue: "All the fees are revenue",
+    ProtocolRevenue: "All the revenue goes to protocol",
+};
+
+const adapter: SimpleAdapter = {
+    version: 2,
+    fetch,
+    methodology,
+    chains: [CHAIN.BSC],
+    start: '2025-10-22',
+}
+
+export default adapter;