diff --git a/package-lock.json b/package-lock.json
index 42cd1ad..b560d00 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@orionprotocol/sdk",
-  "version": "0.20.10-rc21",
+  "version": "0.20.16",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@orionprotocol/sdk",
-      "version": "0.20.10-rc21",
+      "version": "0.20.16",
       "hasInstallScript": true,
       "license": "ISC",
       "dependencies": {
diff --git a/package.json b/package.json
index cdfa0f2..599d44d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@orionprotocol/sdk",
-  "version": "0.20.10-rc24",
+  "version": "0.20.10-rc25",
   "description": "Orion Protocol SDK",
   "main": "./lib/index.cjs",
   "module": "./lib/index.js",
diff --git a/src/Unit/Exchange/generateSwapCalldata.ts b/src/Unit/Exchange/generateSwapCalldata.ts
index 506c79b..eb59716 100644
--- a/src/Unit/Exchange/generateSwapCalldata.ts
+++ b/src/Unit/Exchange/generateSwapCalldata.ts
@@ -62,7 +62,7 @@ export async function generateSwapCalldataWithUnit({
 
   let path = SafeArray.from(arrayLikePath);
   const walletBalance = await getWalletBalance(
-    safeGet(assetToAddress, path.first().assetIn),
+    assetToAddress[path.first().assetIn] ?? path.first().assetIn.toLowerCase(),
     receiverAddress,
     unit.provider
   );
diff --git a/src/config/chains.json b/src/config/chains.json
index 68b940c..7da650e 100644
--- a/src/config/chains.json
+++ b/src/config/chains.json
@@ -99,8 +99,8 @@
     "rpc": "https://rpcapi.fantom.network/",
     "baseCurrencyName": "FTM",
     "contracts": {
-      "WETH": "",
-      "curveRegistry": ""
+      "WETH": "0x21be370D5312f44cB42ce377BC9b8a0cEF1A4C83",
+      "curveRegistry": "0x0f854EA9F38ceA4B1c2FC79047E9D0134419D5d6"
     }
   },
   "137": {
@@ -112,8 +112,8 @@
     "rpc": "https://polygon-rpc.com/",
     "explorer": "https://polygonscan.com/",
     "contracts": {
-      "WETH": "",
-      "curveRegistry": ""
+      "WETH": "0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270",
+      "curveRegistry": "0x094d12e5b541784701FD8d65F11fc0598FBC6332"
     }
   },
   "80001": {
@@ -138,7 +138,7 @@
     "rpc": "https://exchainrpc.okex.org/",
     "baseCurrencyName": "OKT",
     "contracts": {
-      "WETH": "",
+      "WETH": "0x843340759bFCa4a3776F401cD2E03fE9bc0d838f",
       "curveRegistry": ""
     }
   },