wip t bill (#487)

* wip t bill

* Update index.ts

---------

Co-authored-by: 0xpeluche <[email protected]>

Author: Define101

src/adapters/peggedAssets/openeden-tbill/index.ts

@@ -0,0 +1,59 @@
+import axios from "axios";
+import { sumSingleBalance } from "../helper/generalUtil";
+import { addChainExports } from "../helper/getSupply";
+import { Balances, ChainContracts, PeggedIssuanceAdapter } from "../peggedAsset.type";
+
+const NODE_URL = "https://xrplcluster.com";
+
+// Contracts on different chains
+const chainContracts: ChainContracts = {
+  ethereum: {
+    issued: ["0xdd50c053c096cb04a3e3362e2b622529ec5f2e8a"],
+  },
+  arbitrum: {
+    issued: ["0xf84d28a8d28292842dd73d1c5f99476a80b6666a"],
+  },
+  solana: {
+    issued: ["4MmJVdwYN8LwvbGeCowYjSx7KoEi6BJWg8XXnW4fDDp6"],
+  },
+};
+
+function createPayload(account: string) {
+  return {
+    method: "gateway_balances",
+    params: [{ account, ledger_index: "validated" }],
+  };
+}
+
+const rippleMinted = async () => {
+  const balances: Balances = {};
+  const tokenCurrency = "TBL";
+  const issuerAddress = "rJNE2NNz83GJYtWVLwMvchDWEon3huWnFn";
+  const subscriptionOperatorAddress = "rB56JZWRKvpWNeyqM3QYfZwW4fS9YEyPWM";
+
+  // Fetch issuer obligations
+  const { data: issuerData } = await axios.post(NODE_URL, createPayload(issuerAddress));
+  const issuerObligations = parseFloat(issuerData.result.obligations[tokenCurrency] ?? "0");
+
+  // Fetch operator balances
+  const { data: operatorData } = await axios.post(NODE_URL, createPayload(subscriptionOperatorAddress));
+  const operatorAssets = operatorData.result.assets[issuerAddress] || [];
+
+  const heldByOperator = parseFloat(
+    operatorAssets.find((asset: any) => asset.currency === tokenCurrency)?.value ?? "0"
+  );
+
+  const circulatingSupply = Math.max(0, issuerObligations - heldByOperator);
+  sumSingleBalance(balances, "peggedUSD", circulatingSupply, "issued");
+  return balances;
+};
+
+// Merge everything together using addChainExports, and override ripple with custom minted logic
+const adapter: PeggedIssuanceAdapter = {
+  ...addChainExports(chainContracts, undefined),
+  ripple: {
+    minted: rippleMinted,
+  },
+};
+
+export default adapter;