From 40f82d5017fcf46a7d6e9cb73e71479fac4c04ed Mon Sep 17 00:00:00 2001 From: Julien Klepatch Date: Sat, 12 Dec 2020 01:54:38 +0800 Subject: [PATCH] add how to calculate apy defi --- .../266-how-to-calculate-apy-defi/apy1.js | 83 +++ .../266-how-to-calculate-apy-defi/apy2.js | 15 + .../package-lock.json | 549 ++++++++++++++++++ .../package.json | 16 + 4 files changed, 663 insertions(+) create mode 100644 screencast/266-how-to-calculate-apy-defi/apy1.js create mode 100644 screencast/266-how-to-calculate-apy-defi/apy2.js create mode 100644 screencast/266-how-to-calculate-apy-defi/package-lock.json create mode 100644 screencast/266-how-to-calculate-apy-defi/package.json diff --git a/screencast/266-how-to-calculate-apy-defi/apy1.js b/screencast/266-how-to-calculate-apy-defi/apy1.js new file mode 100644 index 0000000000..994735e15f --- /dev/null +++ b/screencast/266-how-to-calculate-apy-defi/apy1.js @@ -0,0 +1,83 @@ +const Compound = require('@compound-finance/compound-js'); + +const provider = 'INFURA URL HERE'; + +const comptroller = Compound.util.getAddress(Compound.Comptroller); +const opf = Compound.util.getAddress(Compound.PriceFeed); + +const cTokenDecimals = 8; // always 8 +const blocksPerDay = 4 * 60 * 24; // 4 blocks in 1 minute +const daysPerYear = 365; +const ethMantissa = Math.pow(10, 18); // 1 * 10 ^ 18 + +async function calculateSupplyApy(cToken, ticker) { + const supplyRatePerBlock = await Compound.eth.read( + cToken, + 'function supplyRatePerBlock() returns (uint)', + [], + { provider } + ); + + return 100 * (Math.pow((supplyRatePerBlock / ethMantissa * blocksPerDay) + 1, daysPerYear - 1) - 1); +} + +async function calculateCompApy(cToken, ticker, underlyingDecimals) { + let compSpeed = await Compound.eth.read( + comptroller, + 'function compSpeeds(address cToken) public returns (uint)', + [ cToken ], + { provider } + ); + + let compPrice = await Compound.eth.read( + opf, + 'function price(string memory symbol) external view returns (uint)', + [ Compound.COMP ], + { provider } + ); + + let totalSupply = await Compound.eth.read( + cToken, + 'function totalSupply() returns (uint)', + [], + { provider } + ); + + let exchangeRate = await Compound.eth.read( + cToken, + 'function exchangeRateCurrent() returns (uint)', + [], + { provider } + ); + + exchangeRate = +exchangeRate.toString() / ethMantissa; + compSpeed = compSpeed / 1e18; // COMP has 18 decimal places + compPrice = compPrice / 1e6; // price feed is USD price with 6 decimal places + totalSupply = (+totalSupply.toString() * exchangeRate) / (Math.pow(10, underlyingDecimals)); + const compPerDay = compSpeed * blocksPerDay; + + return 100 * (compPrice * compPerDay / totalSupply) * 365; +} + +async function calculateApy(cToken, ticker) { + const underlyingDecimals = Compound.decimals[cToken.slice(1, 10)]; + const cTokenAddress = Compound.util.getAddress(cToken); + const [supplyApy, compApy] = await Promise.all([ + calculateSupplyApy(cTokenAddress, ticker), + calculateCompApy(cTokenAddress, ticker, underlyingDecimals) + ]); + console.log(`Supply APY for ${ticker}: ${supplyApy}%`); + console.log(`COMP APY for ${ticker}: ${compApy}%`); + console.log(`Total APY for ${ticker}: ${supplyApy + compApy}%`); + console.log('---'); +} + +async function main() { + await Promise.all([ + calculateApy(Compound.cDAI, 'DAI'), + calculateApy(Compound.cUSDC, 'USDC'), + calculateApy(Compound.cUSDT, 'USDT'), + ]); +} + +main(); diff --git a/screencast/266-how-to-calculate-apy-defi/apy2.js b/screencast/266-how-to-calculate-apy-defi/apy2.js new file mode 100644 index 0000000000..35c5075ac4 --- /dev/null +++ b/screencast/266-how-to-calculate-apy-defi/apy2.js @@ -0,0 +1,15 @@ +const axios = require('axios'); + +async function main() { + const results = await axios.get('https://api.compound.finance/api/v2/ctoken'); + results.data.cToken.forEach(cToken => { + const supplyRate = cToken.supply_rate.value * 100; + const compRate = +cToken.comp_supply_apy.value; + console.log(`Supply APY for ${cToken.underlying_symbol}: ${supplyRate}%`); + console.log(`COMP Supply APY for ${cToken.underlying_symbol}: ${compRate}%`); + console.log(`Total Supply APY for ${cToken.underlying_symbol}: ${compRate + supplyRate}`); + console.log('---'); + }); +} + +main(); diff --git a/screencast/266-how-to-calculate-apy-defi/package-lock.json b/screencast/266-how-to-calculate-apy-defi/package-lock.json new file mode 100644 index 0000000000..bf509cb178 --- /dev/null +++ b/screencast/266-how-to-calculate-apy-defi/package-lock.json @@ -0,0 +1,549 @@ +{ + "name": "266-how-to-calculate-apy-defi", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "@compound-finance/compound-js": { + "version": "0.2.4", + "resolved": "https://registry.npmjs.org/@compound-finance/compound-js/-/compound-js-0.2.4.tgz", + "integrity": "sha512-pXXOOFey48CDRF5HmfqCpbHnuTOUdvLmCrCUYJzyEarZdZWAsqt3HRggOGT5kWpnKvneEp336mQalmlsYz+6Ng==", + "requires": { + "ethers": 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