From 43e0cd2c74a493d5fbe03ca50b8ac92870fe3259 Mon Sep 17 00:00:00 2001
From: Korney Vasilchenko <starkkor@gmail.com>
Date: Tue, 10 Sep 2024 12:59:02 +0100
Subject: [PATCH] TW-1537 Add TKEY stats endpoint

---
 src/index.ts      |  5 +++++
 src/tkey-stats.ts | 44 ++++++++++++++++++++++++++++++++++++++++++++
 tsconfig.json     |  2 +-
 3 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 src/tkey-stats.ts

diff --git a/src/index.ts b/src/index.ts
index 66a1771..88dbeb9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -39,6 +39,7 @@ import { getSignedMoonPayUrl } from './utils/moonpay/get-signed-moonpay-url';
 import { getSigningNonce } from './utils/signing-nonce';
 import SingleQueryDataProvider from './utils/SingleQueryDataProvider';
 import { getExchangeRates } from './utils/tokens';
+import { getTkeyStats } from './tkey-stats';
 
 const PINO_LOGGER = {
   logger: logger.child({ name: 'web' }),
@@ -105,6 +106,10 @@ app.get('/api/top-coins', (_req, res) => {
   res.status(200).send(coinGeckoTokens);
 });
 
+app.get('/api/tkey', async (_req, res) => {
+  res.send(await getTkeyStats());
+});
+
 app.get('/api/notifications', async (_req, res) => {
   try {
     const { platform, startFromTime } = _req.query;
diff --git a/src/tkey-stats.ts b/src/tkey-stats.ts
new file mode 100644
index 0000000..c93a862
--- /dev/null
+++ b/src/tkey-stats.ts
@@ -0,0 +1,44 @@
+import memoizee from 'memoizee';
+import axios from 'axios';
+
+const CONTRACT = 'KT1VaEsVNiBoA56eToEK6n6BcPgh1tdx9eXi';
+const BURN_ADDRESS = 'tz1burnburnburnburnburnburnburjAYjjX';
+const DECIMALS = 18n;
+const TOTAL_SUPPLY = 14_000_000_000_000_000_000_000_000n;
+const TOTAL_SUPPLY_WITH_DECIMALS = TOTAL_SUPPLY / 10n ** DECIMALS;
+
+const INCENTIVES = 1_000_000n;
+const INVESTMENT = 1_000_000n;
+const DEVELOPER_REWARDS = 2_000_000n;
+
+const getBurnedTokens = memoizee(
+  async () => {
+    const response = await axios.get(
+      `https://api.tzkt.io/v1/tokens/balances?account=${BURN_ADDRESS}&token.contract=${CONTRACT}`
+    );
+
+    return BigInt(response.data[0].balance) / 10n ** DECIMALS;
+  },
+  {
+    maxAge: 1000 * 60 * 60 // 1 hour
+  }
+);
+
+export const getTkeyStats = memoizee(
+  async () => {
+    const burned = await getBurnedTokens();
+    const circulating = TOTAL_SUPPLY_WITH_DECIMALS - INCENTIVES - DEVELOPER_REWARDS - INVESTMENT - burned;
+
+    return {
+      incentivesFund: INCENTIVES.toString(),
+      investmentFund: INVESTMENT.toString(),
+      developerRewardsFund: DEVELOPER_REWARDS.toString(),
+      totalSupply: TOTAL_SUPPLY_WITH_DECIMALS.toString(),
+      circulatingSupply: circulating.toString(),
+      burned: burned.toString()
+    };
+  },
+  {
+    maxAge: 1000 * 60 * 60 // 1 hour
+  }
+);
diff --git a/tsconfig.json b/tsconfig.json
index 87d512f..aa0ae21 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "ES2019",
+    "target": "ES2020",
     "module": "commonjs",
     "lib": ["esnext"],
     "allowJs": true,