From 7cabb487f82d7303dfe6878faff320760be54627 Mon Sep 17 00:00:00 2001
From: stanli1231 <stan.li@space.id>
Date: Thu, 9 Jan 2025 15:04:36 +0800
Subject: [PATCH] feat: latch yield (#1681)

---
 src/adaptors/latch/index.js | 81 +++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 src/adaptors/latch/index.js

diff --git a/src/adaptors/latch/index.js b/src/adaptors/latch/index.js
new file mode 100644
index 0000000000..d3ef7dc1a6
--- /dev/null
+++ b/src/adaptors/latch/index.js
@@ -0,0 +1,81 @@
+const sdk = require('@defillama/sdk');
+const axios = require('axios');
+const { GraphQLClient, gql } = require('graphql-request');
+
+const atETH = '0xc314b8637B05A294Ae9D9C29300d5f667c748baD';
+const atUSD = '0xc4af68Dd5b96f0A544c4417407773fEFDc97F58d';
+const project = 'latch';
+const symbolU = 'atUSD';
+const symbolE = 'atETH';
+const weth = '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2';
+const gqlEndpoint = 'https://savings-graphigo.prd.latch.io/query';
+const graphClient = new GraphQLClient(gqlEndpoint);
+const NAV = '0x5D3920CCC068039E5B6FE680CaB7Aa09fE8E053C';
+const abi = 'function getNavByTimestamp(address,uint48) view returns (uint256 , uint48 )';
+const eth = '0x0000000000000000000000000000000000000000'
+const usdt = '0xdac17f958d2ee523a2206206994597c13d831ec7'
+
+
+const apyQuery = gql`
+ query GetAPYs($lsdToken: String!) {\n  GetAPYs(lsdToken: $lsdToken)\n}
+`;
+
+const timestamp = Math.floor(Date.now() / 1000);
+
+const apy = async () => {
+  const tvlUsd =
+    (await sdk.api.erc20.totalSupply({ target: atUSD, chain: 'gravity' })).output /
+    1e18;
+  const tvlEth =
+    (await sdk.api.erc20.totalSupply({ target: atETH, chain: 'gravity' })).output /
+    1e18;
+
+
+  const ethApi = new sdk.ChainApi({ chain: 'ethereum', timestamp: timestamp });
+  await Promise.all([ethApi.getBlock()]);
+  const [usdNav, ethNav] = await Promise.all([
+    ethApi.call({ target: NAV, params: [atUSD, timestamp], abi }),
+    ethApi.call({ target: NAV, params: [atETH, timestamp], abi }),
+  ]);
+  const usdNavNum = parseFloat(usdNav[0].toString());
+  const ethNavNum = parseFloat(ethNav[0].toString());
+  const usdtResult = (tvlUsd * usdNavNum) / Math.pow(10, 18);
+  const ethResult = (tvlEth * ethNavNum) / Math.pow(10, 18);
+
+
+  const ethPriceKey = `ethereum:${eth}`;
+  const ethPrice = (
+    await axios.get(`https://coins.llama.fi/prices/current/${ethPriceKey}`)
+  ).data.coins[ethPriceKey]?.price;
+  const usdtPriceKey = `ethereum:${usdt}`;
+  const usdtPrice = (
+    await axios.get(`https://coins.llama.fi/prices/current/${usdtPriceKey}`)
+  ).data.coins[usdtPriceKey]?.price;
+
+  const { GetAPYs: atUsdApy } = await graphClient.request(apyQuery, { lsdToken: atUSD });
+  const { GetAPYs: atEthApy } = await graphClient.request(apyQuery, { lsdToken: atETH });
+
+
+  return [
+    {
+      pool: `${atETH}-gravity`,
+      chain: 'Gravity',
+      project,
+      symbol: symbolE,
+      underlyingTokens: [atETH],
+      apyBase: Number(atEthApy) * 100,
+      tvlUsd: ethResult * ethPrice,
+    },
+    {
+      pool: `${atUSD}-gravity`,
+      chain: 'Gravity',
+      project,
+      symbol: symbolU,
+      underlyingTokens: [atUSD],
+      apyBase: Number(atUsdApy) * 100,
+      tvlUsd: usdtResult * usdtPrice,
+    },
+  ];
+};
+
+module.exports = { apy, url: 'https://savings.latch.io/' };