From 674d5791a927c0b344bed73c3f72bd270d21bb02 Mon Sep 17 00:00:00 2001
From: bruce-bitty <bruce.cheung@bitty.io>
Date: Wed, 15 Oct 2025 19:15:23 +0800
Subject: [PATCH] feat(bitty): add btc chain (#16681)

---
 projects/bitty/bitcoin/index.js               | 61 +++++++++++++++++++
 projects/bitty/{helper => ethereum}/abis.js   |  2 +-
 .../bitty/{helper => ethereum}/address.js     |  2 +-
 projects/bitty/{helper => ethereum}/index.js  |  2 +-
 projects/bitty/index.js                       | 12 ++--
 5 files changed, 70 insertions(+), 9 deletions(-)
 create mode 100644 projects/bitty/bitcoin/index.js
 rename projects/bitty/{helper => ethereum}/abis.js (99%)
 rename projects/bitty/{helper => ethereum}/address.js (99%)
 rename projects/bitty/{helper => ethereum}/index.js (99%)

diff --git a/projects/bitty/bitcoin/index.js b/projects/bitty/bitcoin/index.js
new file mode 100644
index 000000000..eeca54cb7
--- /dev/null
+++ b/projects/bitty/bitcoin/index.js
@@ -0,0 +1,61 @@
+const { getConfig } = require("../../helper/cache");
+const sdk = require("@defillama/sdk");
+
+const API = 'https://api.bitty.io/lending/asset/explore'
+
+function aggregateBalances(list, pickAmount) {
+  const balances = {}
+  list = Array.isArray(list) ? list : []
+  for (const item of list) {
+    const id = String(item?.assetId || '').toUpperCase()
+    if (id !== 'BTC') continue
+    const amount = pickAmount(item)
+    if (amount > 0n)
+      sdk.util.sumSingleBalance(balances, 'bitcoin', Number(amount / 100000000n))
+  }
+  return balances
+}
+
+async function tvl() {
+  const data = await getConfig('bitty/bitcoin-tvl', API)
+  if (!data) return {}
+
+  // Sum available liquidity (supply - borrowed)
+  const balances = aggregateBalances(data.liquidityList, (item) => {
+    const totalSupply = BigInt(item?.totalSupply ?? '0')
+    const totalBorrowed = BigInt(item?.totalBorrowed ?? '0')
+    const available = totalSupply - totalBorrowed
+    return available > 0n ? available : 0n
+  })
+
+  // Add BTC value of collateral across pools with active debt: collateralAmount * collateralPrice (both in sats)
+  const collateralBalances = aggregateBalances(data.poolList, (item) => {
+    const totalDebt = BigInt(item?.totalDebt ?? '0')
+    if (totalDebt <= 0n) return 0n // Only count collateral for pools with active debt
+
+    const amount = BigInt(item?.collateralAmount ?? '0')
+    const price = BigInt(item?.collateralPrice ?? '0')
+    const total = amount * price
+    return total > 0n ? total : 0n
+  })
+
+  Object.entries(collateralBalances).forEach(([token, amount]) => {
+    sdk.util.sumSingleBalance(balances, token, amount)
+  })
+
+  return balances
+}
+
+async function borrowed() {
+  const data = await getConfig('bitty/bitcoin-tvl', API)
+  if (!data) return {}
+
+  // Sum total borrowed amounts from liquidity pools
+  // Note: totalBorrowed <= 0 indicates no active borrows
+  return aggregateBalances(data.liquidityList, (item) => {
+    const totalBorrowed = BigInt(item?.totalBorrowed ?? '0')
+    return totalBorrowed > 0n ? totalBorrowed : 0n
+  })
+}
+
+module.exports = { tvl, borrowed }
diff --git a/projects/bitty/helper/abis.js b/projects/bitty/ethereum/abis.js
similarity index 99%
rename from projects/bitty/helper/abis.js
rename to projects/bitty/ethereum/abis.js
index 924cc8f71..8f828de20 100644
--- a/projects/bitty/helper/abis.js
+++ b/projects/bitty/ethereum/abis.js
@@ -6,4 +6,4 @@ module.exports = {
     getBNFTAssetList: "function getBNFTAssetList() external view returns (address[] memory)",
     bNftProxys: "function bNftProxys(address) view returns (address)"
   },
-};
\ No newline at end of file
+};
diff --git a/projects/bitty/helper/address.js b/projects/bitty/ethereum/address.js
similarity index 99%
rename from projects/bitty/helper/address.js
rename to projects/bitty/ethereum/address.js
index 001e1fd02..7ab3dffef 100644
--- a/projects/bitty/helper/address.js
+++ b/projects/bitty/ethereum/address.js
@@ -6,4 +6,4 @@ const ChainEthereum = {
 
 module.exports = {
   ethereum: ChainEthereum,
-}
\ No newline at end of file
+}
diff --git a/projects/bitty/helper/index.js b/projects/bitty/ethereum/index.js
similarity index 99%
rename from projects/bitty/helper/index.js
rename to projects/bitty/ethereum/index.js
index e91497bba..dd6e67715 100644
--- a/projects/bitty/helper/index.js
+++ b/projects/bitty/ethereum/index.js
@@ -66,4 +66,4 @@ async function borrowed(api) {
 module.exports = {
   tvl,
   borrowed,
-}
\ No newline at end of file
+}
diff --git a/projects/bitty/index.js b/projects/bitty/index.js
index 105c8c372..0628209dd 100644
--- a/projects/bitty/index.js
+++ b/projects/bitty/index.js
@@ -1,10 +1,10 @@
-const { tvl, borrowed } = require("./helper");
+const ethereum = require("./ethereum");
+const bitcoin = require("./bitcoin");
 const methodologies = require("../helper/methodologies");
 
 module.exports = {
   methodology: methodologies.lendingMarket,
-  ethereum: {
-    tvl,
-    borrowed,
-  }
-};
\ No newline at end of file
+  timetravel: false,
+  ethereum,
+  bitcoin,
+};