Add Brunch

Author: bread4brunch

src/adaptors/brunch/index.js

@@ -0,0 +1,83 @@
+const sdk = require('@defillama/sdk');
+const utils = require('../utils');
+
+const { formatUnits } = require("ethers").utils;
+
+const BUSD_ADDRESS = "0x602BaeaB9B0DE4a99C457cf1249088932AA04FaC";
+const SBUSD_ADDRESS = "0x451812019238785086CFAC408D8A64f06898f6f5";
+const SPOT_PRICE_ORACLE_ADDRESS = "0x095e7e8993A436adf87C90Da2314Da1EfB8F1bA0";
+
+const CHAIN = "sonic";
+
+const apy = async () => {
+  const [
+    { output: rewardRatePerSecond },
+    { output: rewardDistributionEnd },
+    { output: totalReserves },
+    { output: pendingReward },
+    { output: balance },
+    { output: [,underlyingPrice] }
+  ] = await Promise.all([
+    sdk.api.abi.call({
+      target: SBUSD_ADDRESS,
+      abi: "function rewardRatePerSecond() view returns (uint256)",
+      chain: CHAIN,
+    }),
+    sdk.api.abi.call({
+      target: SBUSD_ADDRESS,
+      abi: "function rewardDistributionEnd() view returns (uint256)",
+      chain: CHAIN,
+    }),
+    sdk.api.abi.call({
+      target: SBUSD_ADDRESS,
+      abi: "function totalReserves() view returns (uint256)",
+      chain: CHAIN,
+    }),
+    sdk.api.abi.call({
+      target: SBUSD_ADDRESS,
+      abi: "function pendingReward() view returns (uint256)",
+      chain: CHAIN,
+    }),
+    sdk.api.abi.call({
+      target: BUSD_ADDRESS,
+      abi: "function balanceOf(address) view returns (uint256)",
+      params: [SBUSD_ADDRESS],
+      chain: CHAIN,
+    }),
+    sdk.api.abi.call({
+      target: SPOT_PRICE_ORACLE_ADDRESS,
+      abi: "function currentPrice() view returns (uint256,uint256)",
+      chain: CHAIN,
+    }),
+  ]);
+
+  const tvl = BigInt(balance) - BigInt(pendingReward) - BigInt(totalReserves);
+
+  // underlyingPrice has 8 decimals, BUSD is 18 decimals => scale to 10^26
+  const tvlUsd = Number(formatUnits(tvl * BigInt(underlyingPrice), 26));
+
+  const now = Math.floor(Date.now() / 1000);
+  const apr = (tvl > 0n && rewardDistributionEnd > now)
+  ? formatUnits(BigInt(rewardRatePerSecond) * 86400n * 365n * 1_0000_0000n / tvl, 6) // scale factor = 1e6
+  : 0;
+
+  return [
+    {
+      pool: SBUSD_ADDRESS,
+      chain: CHAIN,
+      project: 'brunch',
+      symbol: utils.formatSymbol('sbUSD'),
+      tvlUsd,
+      underlyingTokens: [BUSD_ADDRESS],
+      apyBase: utils.aprToApy(apr),
+      apyReward: 0,
+      rewardTokens: null,
+    }
+  ];
+};
+
+module.exports = {
+  timetravel: false,
+  apy,
+  url: 'https://brunch.finance/stake',
+};