diff --git a/packages/bitcore-node/src/models/transaction.ts b/packages/bitcore-node/src/models/transaction.ts
index b5e29b80b6f..10342194edd 100644
--- a/packages/bitcore-node/src/models/transaction.ts
+++ b/packages/bitcore-node/src/models/transaction.ts
@@ -432,9 +432,8 @@ export class TransactionModel extends BaseModel<ITransaction> {
       for (const mintOp of mintOps) {
         mintOpsAddresses[mintOp.updateOne.update.$set.address] = true;
       }
-      mintOpsAddresses = Object.keys(mintOpsAddresses);
       let wallets = await WalletAddressStorage.collection
-        .find({ address: { $in: mintOpsAddresses }, chain, network }, { batchSize: 100 })
+        .find({ address: { $in: Object.keys(mintOpsAddresses) }, chain, network }, { batchSize: 100 })
         .project({ wallet: 1, address: 1 })
         .toArray();
       if (wallets.length) {
@@ -547,7 +546,7 @@ export class TransactionModel extends BaseModel<ITransaction> {
         { multi: true }
       ),
       CoinStorage.collection.update(
-        { chain, network, mintTxid: invalidatedTxids },
+        { chain, network, mintTxid: { $in: invalidatedTxids } },
         { $set: { mintHeight: SpentHeightIndicators.conflicting } },
         { multi: true }
       )
diff --git a/packages/bitcore-node/src/routes/api/fee.ts b/packages/bitcore-node/src/routes/api/fee.ts
index 2f67b023aac..96333eeeae0 100644
--- a/packages/bitcore-node/src/routes/api/fee.ts
+++ b/packages/bitcore-node/src/routes/api/fee.ts
@@ -7,7 +7,8 @@ const feeCache = {};
 
 router.get('/:target', CacheMiddleware(CacheTimes.Second), async (req: Request, res: Response) => {
   let { target, chain, network } = req.params;
-  if (target < 0 || target > 100) {
+  const targetNum = Number(target);
+  if (targetNum < 0 || targetNum > 100) {
     return res.status(400).send('invalid target specified');
   }
   const cachedFee = feeCache[`${chain}:${network}:${target}`];
@@ -15,7 +16,7 @@ router.get('/:target', CacheMiddleware(CacheTimes.Second), async (req: Request,
     return res.json(cachedFee.fee);
   }
   try {
-    let fee = await ChainStateProvider.getFee({ chain, network, target });
+    let fee = await ChainStateProvider.getFee({ chain, network, target: targetNum });
     if (!fee) {
       return res.status(404).send('not available right now');
     }
diff --git a/packages/bitcore-node/src/routes/api/wallet.ts b/packages/bitcore-node/src/routes/api/wallet.ts
index 487f1ec55a0..104c8d3e620 100644
--- a/packages/bitcore-node/src/routes/api/wallet.ts
+++ b/packages/bitcore-node/src/routes/api/wallet.ts
@@ -37,7 +37,7 @@ const verifyRequestSignature = (params: VerificationPayload): boolean => {
   }
 };
 
-const authenticate: RequestHandler = async (req: PreAuthRequest, res: Response, next: any) => {
+const authenticate: RequestHandler = async (req: Request, res: Response, next: any) => {
   const { chain, network, pubKey } = req.params as SignedApiRequest;
   logger.debug('Authenticating request with pubKey: ', pubKey);
   let wallet;