diff --git a/fees/openeden-t-bills/index.ts b/fees/openeden-t-bills/index.ts
new file mode 100644
index 0000000000..ebc9e37d0c
--- /dev/null
+++ b/fees/openeden-t-bills/index.ts
@@ -0,0 +1,65 @@
+// https://docs.openeden.com/treasury-bills-vault/fees
+
+import { Chain } from "@defillama/sdk/build/general";
+import { Adapter, FetchOptions, FetchResultV2 } from "../../adapters/types";
+import { CHAIN } from "../../helpers/chains";
+import ADDRESSES from "../../helpers/coreAssets.json";
+
+const eventAbi = `event ProcessDeposit(
+  address sender,
+  address receiver,
+  uint256 assets,
+  uint256 shares,
+  uint256 oeFee,
+  uint256 pFee,
+  uint256 totalFee,
+  address oplTreasury,
+  address treasury
+)`;
+
+const VAULT_ADDRESSES: Record<Chain, string> = {
+  [CHAIN.ETHEREUM]: "0xdd50C053C096CB04A3e3362E2b622529EC5f2e8a",
+  [CHAIN.ARBITRUM]: "0xF84D28A8D28292842dD73D1c5F99476A80b6666A",
+};
+
+const MANAGEMENT_FEES: number = 0.003;
+const DAILY_MANAGEMENT_FEES: number = MANAGEMENT_FEES / 365;
+
+const fetch = async (
+  vault: string,
+  { api, getLogs, createBalances }: FetchOptions
+): Promise<FetchResultV2> => {
+  const dailyFees = createBalances();
+
+  const [logs, totalUSDC] = await Promise.all([
+    getLogs({ target: vault, eventAbi }),
+    api.call({ target: vault, abi: "uint256:totalAssets" }),
+  ]);
+
+  dailyFees.add(ADDRESSES[api.chain].USDC, totalUSDC * DAILY_MANAGEMENT_FEES);
+
+  logs.forEach((log) => {
+    const feeAmount = log[4];
+    dailyFees.add(ADDRESSES[api.chain].USDC, feeAmount);
+  });
+
+  return { dailyFees };
+};
+
+const adapter: Adapter = {
+  version: 2,
+  adapter: {
+    [CHAIN.ETHEREUM]: {
+      fetch: (options: FetchOptions) =>
+        fetch(VAULT_ADDRESSES[CHAIN.ETHEREUM], options),
+      start: 1697580000,
+    },
+    [CHAIN.ARBITRUM]: {
+      fetch: (options: FetchOptions) =>
+        fetch(VAULT_ADDRESSES[CHAIN.ARBITRUM], options),
+      start: 1707778800,
+    },
+  },
+};
+
+export default adapter;