diff --git a/src/lookups.js b/src/lookups.js
index 5ebc8d1..a907f64 100644
--- a/src/lookups.js
+++ b/src/lookups.js
@@ -7,7 +7,7 @@ import logger from 'winston'
 export async function isSubdomainRegistered(fullyQualifiedAddress: String) {
 
   try {
-    const nameInfoUrl = bskConfig.network.coreApiUrl + '/v1/names/' + fullyQualifiedAddress
+    const nameInfoUrl = bskConfig.network.blockstackAPIUrl + '/v1/names/' + fullyQualifiedAddress
     const nameInfoRequest = await fetch(nameInfoUrl)
     const { status } = nameInfoRequest
     if (status == 200) {
diff --git a/src/operations.js b/src/operations.js
index 085ba1c..8311d71 100644
--- a/src/operations.js
+++ b/src/operations.js
@@ -171,7 +171,7 @@ export async function submitUpdate(
     throw new Error('Invalid domain name')
   }
 
-  const nameInfoUrl = bskConfig.network.coreApiUrl + '/v1/names/' + domainName
+  const nameInfoUrl = bskConfig.network.blockstackAPIUrl + '/v1/names/' + domainName
   const nameInfoRequest = await fetch(nameInfoUrl)
   const nameInfo = await nameInfoRequest.json()
 
@@ -267,7 +267,7 @@ export async function checkTransactions(
       if (!tx.blockHeight || tx.blockHeight <= 0) {
         // const txInfo = await bskConfig.network.getTransactionInfo(tx.txHash)
         const url = new URL(
-          bskConfig.network.coreApiUrl + `/extended/v1/tx/0x${tx.txHash}`
+          bskConfig.network.blockstackAPIUrl + `/extended/v1/tx/0x${tx.txHash}`
         );
         const httpRequest = await fetch(url);
         const reqText = await httpRequest.text();
diff --git a/tests/src/index.js b/tests/src/index.js
index 7f6f385..0b269df 100644
--- a/tests/src/index.js
+++ b/tests/src/index.js
@@ -9,6 +9,7 @@ import { StacksMainnet } from '@stacks/network'
 nock.disableNetConnect()
 
 bskConfig.network = new StacksMainnet()
+bskConfig.network.blockstackAPIUrl = bskConfig.network.coreApiUrl
 
 unitTestLookups()
 unitTestOperations()