Latch Project TVL Adapter (DefiLlama#12874)

Author: stanli1231

projects/latch/index.js

@@ -0,0 +1,44 @@
+const BN = require('bn.js');
+const sdk = require('@defillama/sdk');
+
+const atUSD = '0xc4af68Dd5b96f0A544c4417407773fEFDc97F58d';
+const atETH = '0xc314b8637B05A294Ae9D9C29300d5f667c748baD';
+const NAV = '0x5D3920CCC068039E5B6FE680CaB7Aa09fE8E053C';
+const abi = 'function getNavByTimestamp(address,uint48) view returns (uint256 , uint48 )';
+
+const tvl = async (api) => {
+    const chainEth = 'ethereum';
+    const chainGravity = 'gravity';
+
+    const ethApi = new sdk.ChainApi({ chain: chainEth, timestamp: api.timestamp });
+    const gravityApi = new sdk.ChainApi({ chain: chainGravity });
+
+    await Promise.all([ethApi.getBlock(), gravityApi.getBlock()]);
+
+    const [usdNav, ethNav, usdtSupply, ethSupply] = await Promise.all([
+        ethApi.call({ target: NAV, params: [atUSD, api.timestamp], abi }),
+        ethApi.call({ target: NAV, params: [atETH, api.timestamp], abi }),
+        gravityApi.call({ abi: 'erc20:totalSupply', target: atUSD }),
+        gravityApi.call({ abi: 'erc20:totalSupply', target: atETH }),
+    ]);
+
+    // Convert results to BN
+    const usdNavBN = new BN(usdNav[0].toString());
+    const ethNavBN = new BN(ethNav[0].toString());
+    const usdtSupplyBN = new BN(usdtSupply.toString());
+    const ethSupplyBN = new BN(ethSupply.toString());
+
+    // Perform calculations
+    const usdtResult = usdtSupplyBN.mul(usdNavBN).div(new BN('10').pow(new BN(30)));
+    const ethResult = ethSupplyBN.mul(ethNavBN).div(new BN('10').pow(new BN(18)));
+
+    // Add results to API
+    api.add('0xdac17f958d2ee523a2206206994597c13d831ec7', usdtResult.toString());
+    api.add('0x0000000000000000000000000000000000000000', ethResult.toString());
+};
+
+module.exports = {
+    ethereum: {
+        tvl: tvl,
+    },
+};