feat: add LOAN Protocol adapter for DefiLlama

Author: andrewlfc7

projects/ithaca/index.js

@@ -24,3 +24,4 @@ module.exports = {
     }),
   }
 }; 
+

projects/loan-protocol/index.js

@@ -0,0 +1,111 @@
+const { post } = require('../helper/http');
+const sdk = require('@defillama/sdk');
+
+const tokenMapping = {
+  'xtokens:XBTC': 'bitcoin',
+  'xtokens:XLTC': 'litecoin',
+  'xtokens:XETH': 'ethereum',
+  'xtokens:XXRP': 'ripple',
+  'eosio.token:XPR': 'proton',
+  'xtokens:XMT': 'metal',
+  'xtokens:XUST': 'terrausd-wormhole',   // optional/legacy
+  'xtokens:XLUNA': 'terra-luna-2',       // optional/legacy
+  'xtokens:XUSDC': 'usd-coin',
+  'xtokens:XDOGE': 'dogecoin',
+  'xtokens:XUSDT': 'tether',
+};
+
+const API_ENDPOINT = 'https://proton.eosusa.io';
+const LENDING_CONTRACT = 'lending.loan';
+
+function parseAsset(assetString) {
+  if (!assetString) return { amount: 0, symbol: '' };
+  const [amount, symbol] = assetString.split(' ');
+  return { amount: parseFloat(amount), symbol };
+}
+
+async function fetchMarkets() {
+  const res = await post(`${API_ENDPOINT}/v1/chain/get_table_rows`, {
+    code: LENDING_CONTRACT,
+    scope: LENDING_CONTRACT,
+    table: 'markets',
+    limit: 100,
+    json: true,
+  });
+  return res.rows || [];
+}
+
+async function fetchLiquidity(tokenContract, symbol) {
+  const res = await post(`${API_ENDPOINT}/v1/chain/get_table_rows`, {
+    code: tokenContract,
+    scope: LENDING_CONTRACT,
+    table: 'accounts',
+    limit: 100,
+    json: true,
+  });
+  const rows = res.rows || [];
+  const tokenBalance = rows.find(b => parseAsset(b.balance).symbol === symbol);
+  return tokenBalance ? parseAsset(tokenBalance.balance).amount : 0;
+}
+
+// ----------------------------
+// TVL = borrows + cash reserves
+// ----------------------------
+async function tvl() {
+  const balances = {};
+  const markets = await fetchMarkets();
+
+  const promises = markets.map(async (market) => {
+    const totalVar = parseAsset(market.total_variable_borrows.quantity).amount;
+    const totalStable = parseAsset(market.total_stable_borrows.quantity).amount;
+    const totalBorrows = totalVar + totalStable;
+
+    const [ , symbol ] = market.underlying_symbol.sym.split(',');
+    const tokenContract = market.underlying_symbol.contract;
+
+    // liquidity available in lending contract
+    const cashAvailable = await fetchLiquidity(tokenContract, symbol);
+    const totalSupplied = totalBorrows + cashAvailable;
+
+    const internalId = `${tokenContract}:${symbol}`;
+    const cgkId = tokenMapping[internalId];
+    if (!cgkId) return;
+
+    sdk.util.sumSingleBalance(balances, `coingecko:${cgkId}`, totalSupplied);
+  });
+
+  await Promise.all(promises);
+  return balances;
+}
+
+// ----------------------------
+// Borrowed = borrows only
+// ----------------------------
+async function borrowed() {
+  const balances = {};
+  const markets = await fetchMarkets();
+
+  markets.forEach(market => {
+    const totalVar = parseAsset(market.total_variable_borrows.quantity).amount;
+    const totalStable = parseAsset(market.total_stable_borrows.quantity).amount;
+    const totalBorrows = totalVar + totalStable;
+
+    const [ , symbol ] = market.underlying_symbol.sym.split(',');
+    const tokenContract = market.underlying_symbol.contract;
+    const internalId = `${tokenContract}:${symbol}`;
+    const cgkId = tokenMapping[internalId];
+    if (!cgkId) return;
+
+    sdk.util.sumSingleBalance(balances, `coingecko:${cgkId}`, totalBorrows);
+  });
+
+  return balances;
+}
+
+module.exports = {
+  methodology: 'TVL = variable borrows + stable borrows + available liquidity in lending.loan. Borrowed = total outstanding borrows (variable + stable). Mapping is to CoinGecko IDs.',
+  proton: {
+    tvl,
+    borrowed,
+  }
+};