diff --git a/.env.default b/.env.default
index 6753a4e..b8dca37 100644
--- a/.env.default
+++ b/.env.default
@@ -1,2 +1,4 @@
 CMC_API_KEY=xxx // CoinMarketCap Key for unit test
-KULAP_API_BASH_URL=https://api.kulap.io/v1/api // Optional
+KULAP_API_BASE_URL=https://api.kulap.io/v1/api // Optional
+FORKED_MAINNET_URL=PLEASE_PROVIDE_ETH_ARCHIVE_NODE_URL(https://archivenode.io/,https://infura.io/pricing)
+MNEMONIC=KULAP_SDK
\ No newline at end of file
diff --git a/.env.example b/.env.example
deleted file mode 100644
index f119bba..0000000
--- a/.env.example
+++ /dev/null
@@ -1,2 +0,0 @@
-FORKED_MAINNET_URL=PLEASE_PROVIDE_ETH_ARCHIVE_NODE_URL(https://archivenode.io/,https://infura.io/pricing)
-MNEMONIC=KULAP_SDK
\ No newline at end of file
diff --git a/README.md b/README.md
index 5840098..34b20ea 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ const srcToken = "DAI"
 const destToken = "LINK"
 const amountIn = "100" // 100 DAI
 
-const response = await kulapSDK.getRate(baseToken, pairToken, amountIn) // Get best rate from off-chain API
+const response = await kulapSDK.getRate(srcToken, destToken, amountIn) // Get best rate from off-chain API
 
 const isApproved = await kulapSDK.validate(response) // Check allowance of DAI token to Kulap DEX smart contract is made
 
@@ -82,7 +82,7 @@ const srcToken = "ETH"
 const destToken = "DAI"
 const amountIn = "1" // 1 ETH
 
-const order = await kulapSDK.getRate(baseToken, pairToken, amountIn)
+const order = await kulapSDK.getRate(srcToken, destToken, amountIn)
 ```
 ##### Response
 | Value      | Description                                |
diff --git a/src/constants.ts b/src/constants.ts
index 7f5484c..383615c 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -1,6 +1,6 @@
 require('dotenv').config()
 
-export const API_BASE_URL = process.env.KULAP_API_BASH_URL || 'https://api.kulap.io/v1/api'
+export const API_BASE_URL = process.env.KULAP_API_BASE_URL || 'https://api.kulap.io/v1/api'
 console.log('API_BASE_URL', API_BASE_URL)
 export const CMC_URL = "https://pro-api.coinmarketcap.com"