moo

package.json

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+{
+  "name": "beefy-api",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "start": "nodemon src/app.js",
+    "test": "nyc ava"
+  },
+  "dependencies": {
+    "@koa/cors": "^3.1.0",
+    "@koa/router": "^9.4.0",
+    "koa": "^2.13.0",
+    "koa-bodyparser": "^4.3.0",
+    "koa-helmet": "^5.2.0",
+    "koa-router": "^9.4.0"
+  },
+  "devDependencies": {
+    "ava": "^3.12.1",
+    "axios": "^0.20.0",
+    "dotenv": "^8.2.0",
+    "nodemon": "^2.0.4",
+    "nyc": "^15.1.0",
+    "prettier": "2.1.1"
+  }
+}

readme.md

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+# Beefy API
+
+## Overview
+
+Simple API for BeefyFinance.

src/api/noop.js

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+'use strict';
+
+async function noop(ctx, next) {
+  console.log(`NOOP: ${ctx.url} NOT IMPLEMENTED YET!`);
+  ctx.status = { status: 200, msg: 'noop' };
+}
+
+module.exports = noop;

src/api/stats.js

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+'use strict';
+
+const axios = require('axios');
+const compound = require('../utils/compound');
+
+async function apy(ctx) {
+  try {
+    const resSimple = await axios.get('https://bsc.for.tube/api/v2/bank_tokens');
+    const resExtended = await axios.get('https://bsc.for.tube/api/v1/bank/markets?mode=extended', {
+      headers: {
+        authorization: process.env.FORTUBE_API_TOKEN,
+      },
+    });
+
+    const dataSimple = resSimple.data;
+    const dataExtended = resExtended.data.data;
+
+    let apys = {};
+
+    Object.values(dataSimple).map(item => {
+      const symbol = item.symbol.toLowerCase();
+      const apy = compound(parseFloat(item.estimated_ar));
+      apys[symbol] = apy;
+    });
+
+    dataExtended.map(item => {
+      apys[item.token_symbol.toLowerCase()] += parseFloat(item.deposit_interest_rate);
+    });
+
+    for (const key in apys) {
+      apys[key] = `${(apys[key] * 100).toFixed(2)}%`;
+    }
+
+    ctx.status = 200;
+    ctx.body = apys;
+  } catch (err) {
+    ctx.status = 500;
+  }
+}
+
+module.exports = { apy };

src/app.js

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+'use strict';
+
+const Koa = require('koa');
+const helmet = require('koa-helmet');
+const body = require('koa-bodyparser');
+const cors = require('@koa/cors');
+
+const logger = require('./middleware/logger');
+const rt = require('./middleware/rt');
+const powered = require('./middleware/powered');
+
+const cfg = require(`./config/${process.env.NODE_ENV}`);
+const router = require('./router');
+
+const app = new Koa();
+app.use(helmet());
+app.use(cors());
+app.use(logger);
+app.use(rt);
+app.use(powered);
+app.use(body());
+
+app.use(router.routes());
+app.use(router.allowedMethods());
+
+console.log('> beefy-api running!');
+app.listen(cfg.port);

src/config/development.json

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+{
+  "host": "localhost",
+  "port": 3001
+}

src/config/production.json

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+{
+  "host": "localhost",
+  "port": 3001
+}

src/middleware/logger.js

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+'use strict';
+
+async function logger(ctx, next) {
+  console.log(`--> ${ctx.method} ${ctx.url}`);
+  await next();
+  const rt = ctx.response.get('X-Response-Time');
+  console.log(`<-- ${ctx.method} ${ctx.url} | status: ${ctx.status} | len: ${ctx.length} | time: ${rt} \n`);
+}
+
+module.exports = logger;

src/middleware/powered.js

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+'use strict';
+
+async function rt(ctx, next) {
+  await next();
+  ctx.set('X-Powered-By', 'moo!');
+}
+
+module.exports = rt;

src/middleware/rt.js

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+'use strict';
+
+async function rt(ctx, next) {
+  const start = Date.now();
+  await next();
+  const ms = Date.now() - start;
+  ctx.set('X-Response-Time', `${ms}ms`);
+}
+
+module.exports = rt;

src/router.js

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+'use strict';
+
+const Router = require('koa-router');
+const router = new Router();
+
+const noop = require('./api/noop');
+const stats = require('./api/stats');
+
+router.get('/apy', stats.apy);
+
+module.exports = router;

src/utils/compound.js

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+const compound = (r, n = 365, t = 1) => {
+  return (1 + r / n) ** (n * t) - 1;
+};
+
+module.exports = compound;