diff --git a/README.md b/README.md
index b333f8b..e1b34bf 100644
--- a/README.md
+++ b/README.md
@@ -54,23 +54,27 @@ uint64_t unlocked_account_balance = account.m_unlocked_balance.get(); // get boo
 // query a transaction by hash
 monero_tx_query tx_query;
 tx_query.m_hash = "314a0f1375db31cea4dac4e0a51514a6282b43792269b3660166d4d2b46437ca";
-shared_ptr<monero_tx_wallet> tx = wallet_restored->get_txs(tx_query)[0];
+vector<shared_ptr<monero_tx_wallet>> txs = wallet_restored->get_txs(tx_query);
+shared_ptr<monero_tx_wallet> tx = txs[0];
 for (const shared_ptr<monero_transfer> transfer : tx->get_transfers()) {
   bool is_incoming = transfer->is_incoming().get();
   uint64_t in_amount = transfer->m_amount.get();
   int account_index = transfer->m_account_index.get();
 }
+monero_utils::free(txs);
 
 // query incoming transfers to account 1
 monero_transfer_query transfer_query;
 transfer_query.m_is_incoming = true;
 transfer_query.m_account_index = 1;
 vector<shared_ptr<monero_transfer>> transfers = wallet_restored->get_transfers(transfer_query);
+monero_utils::free(transfers);
 
 // query unspent outputs
 monero_output_query output_query;
 output_query.m_is_spent = false;
 vector<shared_ptr<monero_output_wallet>> outputs = wallet_restored->get_outputs(output_query);
+monero_utils::free(outputs);
 
 // create and sync a new wallet with a random seed phrase
 wallet_config = monero_wallet_config();
@@ -116,6 +120,7 @@ tx_config.m_amount = 50000;
 tx_config.m_relay = true;
 shared_ptr<monero_tx_wallet> sent_tx = wallet_restored->create_tx(tx_config);
 bool in_pool = sent_tx->m_in_tx_pool.get();  // true
+monero_utils::free(sent_tx);
 
 // mine with 7 threads to push the network along
 int num_threads = 7;
@@ -146,10 +151,13 @@ tx_config.m_destinations = destinations;
 shared_ptr<monero_tx_wallet> created_tx = wallet_restored->create_tx(tx_config);
 uint64_t fee = created_tx->m_fee.get(); // "Are you sure you want to send ...?"
 wallet_restored->relay_tx(*created_tx); // recipient receives notification within 5 seconds
+monero_utils::free(created_tx);
 
 // save and close the wallets
 wallet_restored->close(true);
 wallet_random->close(true);
+delete wallet_restored;
+delete wallet_random;
 ```
 
 ## Documentation
diff --git a/src/utils/monero_utils.h b/src/utils/monero_utils.h
index 1940841..2b13eb2 100644
--- a/src/utils/monero_utils.h
+++ b/src/utils/monero_utils.h
@@ -175,16 +175,70 @@ namespace monero_utils
     return ss.str();
   }
 
-  /**
-   * Free memory of a block.
-   *
-   * @param block is the block to free
-   */
+  // ----------------------------- GATHER BLOCKS ------------------------------
+
+  static std::vector<std::shared_ptr<monero_block>> get_blocks_from_txs(std::vector<std::shared_ptr<monero_tx_wallet>> txs) {
+    std::shared_ptr<monero_block> unconfirmed_block = nullptr; // placeholder for unconfirmed txs
+    std::vector<std::shared_ptr<monero_block>> blocks;
+    std::unordered_set<std::shared_ptr<monero_block>> seen_block_ptrs;
+    for (const std::shared_ptr<monero_tx_wallet>& tx : txs) {
+      if (tx->m_block == boost::none) {
+        if (unconfirmed_block == nullptr) unconfirmed_block = std::make_shared<monero_block>();
+        tx->m_block = unconfirmed_block;
+        unconfirmed_block->m_txs.push_back(tx);
+      }
+      std::unordered_set<std::shared_ptr<monero_block>>::const_iterator got = seen_block_ptrs.find(tx->m_block.get());
+      if (got == seen_block_ptrs.end()) {
+        seen_block_ptrs.insert(tx->m_block.get());
+        blocks.push_back(tx->m_block.get());
+      }
+    }
+    return blocks;
+  }
+
+  static std::vector<std::shared_ptr<monero_block>> get_blocks_from_transfers(std::vector<std::shared_ptr<monero_transfer>> transfers) {
+    std::shared_ptr<monero_block> unconfirmed_block = nullptr; // placeholder for unconfirmed txs in return json
+    std::vector<std::shared_ptr<monero_block>> blocks;
+    std::unordered_set<std::shared_ptr<monero_block>> seen_block_ptrs;
+    for (auto const& transfer : transfers) {
+      std::shared_ptr<monero_tx_wallet> tx = transfer->m_tx;
+      if (tx->m_block == boost::none) {
+        if (unconfirmed_block == nullptr) unconfirmed_block = std::make_shared<monero_block>();
+        tx->m_block = unconfirmed_block;
+        unconfirmed_block->m_txs.push_back(tx);
+      }
+      std::unordered_set<std::shared_ptr<monero_block>>::const_iterator got = seen_block_ptrs.find(tx->m_block.get());
+      if (got == seen_block_ptrs.end()) {
+        seen_block_ptrs.insert(tx->m_block.get());
+        blocks.push_back(tx->m_block.get());
+      }
+    }
+    return blocks;
+  }
+
+  static std::vector<std::shared_ptr<monero_block>> get_blocks_from_outputs(std::vector<std::shared_ptr<monero_output_wallet>> outputs) {
+    std::vector<std::shared_ptr<monero_block>> blocks;
+    std::unordered_set<std::shared_ptr<monero_block>> seen_block_ptrs;
+    for (auto const& output : outputs) {
+      std::shared_ptr<monero_tx_wallet> tx = std::static_pointer_cast<monero_tx_wallet>(output->m_tx);
+      if (tx->m_block == boost::none) throw std::runtime_error("Need to handle unconfirmed output");
+      std::unordered_set<std::shared_ptr<monero_block>>::const_iterator got = seen_block_ptrs.find(*tx->m_block);
+      if (got == seen_block_ptrs.end()) {
+        seen_block_ptrs.insert(*tx->m_block);
+        blocks.push_back(*tx->m_block);
+      }
+    }
+    return blocks;
+  }
+
+  // ------------------------------ FREE MEMORY -------------------------------
+
   static void free(std::shared_ptr<monero_block> block) {
     for (std::shared_ptr<monero_tx>& tx : block->m_txs) {
-      tx->m_block.reset();
+      tx->m_block->reset();
       monero_tx_wallet* tx_wallet = dynamic_cast<monero_tx_wallet*>(tx.get());
       if (tx_wallet != nullptr) {
+        if (tx_wallet->m_tx_set != boost::none) tx_wallet->m_tx_set->reset();
         if (tx_wallet->m_outgoing_transfer != boost::none) tx_wallet->m_outgoing_transfer.get()->m_tx.reset();
         for (std::shared_ptr<monero_transfer> transfer : tx_wallet->m_incoming_transfers) transfer->m_tx.reset();
         for (std::shared_ptr<monero_output> output : tx_wallet->m_outputs) output->m_tx.reset();
@@ -193,17 +247,44 @@ namespace monero_utils
           input->m_tx.reset();
         }
       }
+      monero_tx_query* tx_query = dynamic_cast<monero_tx_query*>(tx.get());
+      if (tx_query != nullptr) {
+        if (tx_query->m_transfer_query != boost::none) {
+          tx_query->m_transfer_query.get()->m_tx_query->reset();
+          tx_query->m_transfer_query.get().reset();
+        }
+        if (tx_query->m_output_query != boost::none) {
+          tx_query->m_output_query.get()->m_tx_query->reset();
+          tx_query->m_output_query.get().reset();
+        }
+      }
     }
     block.reset();
   }
 
-  /**
-   * Free memory of blocks.
-   *
-   * @param blocks are blocks to free
-   */
   static void free(std::vector<std::shared_ptr<monero_block>> blocks) {
     for (std::shared_ptr<monero_block>& block : blocks) monero_utils::free(block);
   }
+
+  static void free(std::shared_ptr<monero_tx> tx) {
+    if (tx->m_block == boost::none) {
+      std::shared_ptr<monero_block> block = std::make_shared<monero_block>();
+      tx->m_block = block;
+      block->m_txs.push_back(tx);
+    }
+    monero_utils::free(tx->m_block.get());
+  }
+
+  static void free(std::vector<std::shared_ptr<monero_tx_wallet>> txs) {
+    return monero_utils::free(monero_utils::get_blocks_from_txs(txs));
+  }
+
+  static void free(std::vector<std::shared_ptr<monero_transfer>> transfers) {
+    return monero_utils::free(monero_utils::get_blocks_from_transfers(transfers));
+  }
+
+  static void free(std::vector<std::shared_ptr<monero_output_wallet>> outputs) {
+    return monero_utils::free(monero_utils::get_blocks_from_outputs(outputs));
+  }
 }
 #endif /* monero_utils_h */
diff --git a/src/wallet/monero_wallet.h b/src/wallet/monero_wallet.h
index 4d07165..65cb346 100644
--- a/src/wallet/monero_wallet.h
+++ b/src/wallet/monero_wallet.h
@@ -704,7 +704,7 @@ namespace monero {
      * Get all wallet transactions.  Wallet transactions contain one or more
      * transfers that are either incoming or outgoing to the wallet.
      *
-     * @return all wallet transactions
+     * @return all wallet transactions (free memory using monero_utils::free)
      */
     virtual std::vector<std::shared_ptr<monero_tx_wallet>> get_txs() const {
       throw std::runtime_error("get_txs() not supported");
@@ -720,7 +720,7 @@ namespace monero {
      * not defined.
      *
      * @param query filters query results (optional)
-     * @return wallet transactions per the query
+     * @return wallet transactions per the query (free memory using monero_utils::free)
      */
     virtual std::vector<std::shared_ptr<monero_tx_wallet>> get_txs(const monero_tx_query& query) const {
       throw std::runtime_error("get_txs(query) not supported");
@@ -740,7 +740,7 @@ namespace monero {
      * defined.
      *
      * @param query filters query results (optional)
-     * @return wallet transfers per the query
+     * @return wallet transfers per the query (free memory using monero_utils::free)
      */
     virtual std::vector<std::shared_ptr<monero_transfer>> get_transfers(const monero_transfer_query& query) const {
       throw std::runtime_error("get_transfers() not supported");
@@ -756,7 +756,7 @@ namespace monero {
      * filtering is optional and no filtering is applied when not defined.
      *
      * @param query specifies query options (optional)
-     * @return wallet outputs per the query
+     * @return wallet outputs per the query (free memory using monero_utils::free)
      */
     virtual std::vector<std::shared_ptr<monero_output_wallet>> get_outputs(const monero_output_query& query) const {
       throw std::runtime_error("get_outputs() not supported");
@@ -834,7 +834,7 @@ namespace monero {
      * Create a transaction to transfer funds from this wallet.
      *
      * @param config configures the transaction to create
-     * @return the created transaction
+     * @return the created transaction (free memory using monero_utils::free)
      */
     virtual std::shared_ptr<monero_tx_wallet> create_tx(const monero_tx_config& config) {
       if (config.m_can_split != boost::none && config.m_can_split.get()) throw std::runtime_error("Cannot split transactions with create_tx(); use create_txs() instead");
@@ -847,7 +847,7 @@ namespace monero {
      * Create one or more transactions to transfer funds from this wallet.
      *
      * @param config configures the transactions to create
-     * @return the created transactions
+     * @return the created transactions (free memory using monero_utils::free)
      */
     virtual std::vector<std::shared_ptr<monero_tx_wallet>> create_txs(const monero_tx_config& config) {
       throw std::runtime_error("create_txs() not supported");
@@ -857,7 +857,7 @@ namespace monero {
      * Sweep unlocked funds according to the given config.
      *
      * @param config is the sweep configuration
-     * @return the created transactions
+     * @return the created transactions (free memory using monero_utils::free)
      */
     virtual std::vector<std::shared_ptr<monero_tx_wallet>> sweep_unlocked(const monero_tx_config& config) {
       throw std::runtime_error("sweep_unlocked() not supported");
@@ -867,7 +867,7 @@ namespace monero {
      * Sweep an output with a given key image.
      *
      * @param config configures the sweep transaction
-     * @return the created transaction
+     * @return the created transaction (free memory using monero_utils::free)
      */
     virtual std::shared_ptr<monero_tx_wallet> sweep_output(const monero_tx_config& config) {
       throw std::runtime_error("sweep_output() not supported");
@@ -877,7 +877,7 @@ namespace monero {
      * Sweep all unmixable dust outputs back to the wallet to make them easier to spend and mix.
      *
      * @param relay specifies if the resulting transaction should be relayed (default false)
-     * @return the created transactions
+     * @return the created transactions (free memory using monero_utils::free)
      */
     virtual std::vector<std::shared_ptr<monero_tx_wallet>> sweep_dust(bool relay = false) {
       throw std::runtime_error("sweep_dust() not supported");
diff --git a/src/wallet/monero_wallet_full.cpp b/src/wallet/monero_wallet_full.cpp
index e236dfd..5d2f953 100644
--- a/src/wallet/monero_wallet_full.cpp
+++ b/src/wallet/monero_wallet_full.cpp
@@ -819,8 +819,7 @@ namespace monero {
           m_prev_locked_tx_hashes.insert(tx->m_hash.get());
 
           // free memory
-          output.reset();
-          tx.reset();
+          monero_utils::free(tx);
         } catch (std::exception& e) {
           std::cout << "Error processing unconfirmed output received: " << std::string(e.what()) << std::endl;
         }
@@ -862,8 +861,6 @@ namespace monero {
 
           // free memory
           monero_utils::free(block);
-          output.reset();
-          tx.reset();
         } catch (std::exception& e) {
           std::cout << "Error processing confirmed output received: " << std::string(e.what()) << std::endl;
         }
@@ -905,8 +902,6 @@ namespace monero {
 
           // free memory
           monero_utils::free(block);
-          output.reset();
-          tx.reset();
         } catch (std::exception& e) {
           std::cout << "Error processing confirmed output spent: " << std::string(e.what()) << std::endl;
         }
@@ -998,6 +993,10 @@ namespace monero {
       for (const std::shared_ptr<monero_tx_wallet>& locked_tx : locked_txs) {
         m_prev_locked_tx_hashes.insert(locked_tx->m_hash.get());
       }
+
+      // free memory
+      monero_utils::free(locked_txs);
+      monero_utils::free(txs_no_longer_locked);
     }
 
     void notify_outputs(const std::shared_ptr<monero_tx_wallet>& tx) {
@@ -1023,8 +1022,9 @@ namespace monero {
           block_notify->m_txs.push_back(tx_notify);
         }
         
-        // notify listeners
+        // notify listeners and free memory
         for (monero_wallet_listener* listener : m_wallet.get_listeners()) listener->on_output_spent(*input);
+        monero_utils::free(tx_notify);
       }
 
       // notify received outputs
@@ -1741,6 +1741,7 @@ namespace monero {
     temp_transfer_query->m_tx_query = decontextualize(_query->copy(_query, std::make_shared<monero_tx_query>()));
     temp_transfer_query->m_tx_query.get()->m_transfer_query = temp_transfer_query;
     std::vector<std::shared_ptr<monero_transfer>> transfers = get_transfers_aux(*temp_transfer_query);
+    monero_utils::free(temp_transfer_query->m_tx_query.get());
 
     // collect unique txs from transfers while retaining order
     std::vector<std::shared_ptr<monero_tx_wallet>> txs = std::vector<std::shared_ptr<monero_tx_wallet>>();
@@ -1765,6 +1766,7 @@ namespace monero {
       temp_output_query->m_tx_query = decontextualize(_query->copy(_query, std::make_shared<monero_tx_query>()));
       temp_output_query->m_tx_query.get()->m_output_query = temp_output_query;
       std::vector<std::shared_ptr<monero_output_wallet>> outputs = get_outputs_aux(*temp_output_query);
+      monero_utils::free(temp_output_query->m_tx_query.get());
 
       // merge output txs one time while retaining order
       std::unordered_set<std::shared_ptr<monero_tx_wallet>> output_txs;
@@ -1802,7 +1804,9 @@ namespace monero {
     for (const std::shared_ptr<monero_tx_wallet>& tx : txs) {
       if (*tx->m_is_confirmed && tx->m_block == boost::none) {
         std::cout << "WARNING: Inconsistency detected building txs from multiple wallet2 calls, re-fetching" << std::endl;
-        return get_txs(*_query);
+        std::vector<std::shared_ptr<monero_tx_wallet>> txs = get_txs(*_query);
+        monero_utils::free(_query);
+        return txs;
       }
     }
 
@@ -1815,6 +1819,8 @@ namespace monero {
       }
     }
 
+    // free query and return
+    monero_utils::free(_query);
     return txs;
   }
 
@@ -3567,6 +3573,7 @@ namespace monero {
 
     // check if fetching pool txs contradicted by configuration
     if (tx_query->m_in_tx_pool != boost::none && tx_query->m_in_tx_pool.get() && !can_be_in_tx_pool) {
+      monero_utils::free(tx_query);
       throw std::runtime_error("Cannot fetch pool transactions because it contradicts configuration");
     }
 
@@ -3633,7 +3640,7 @@ namespace monero {
     }
     sort(txs.begin(), txs.end(), tx_height_less_than);
 
-    // filter and return transfers
+    // filter transfers
     std::vector<std::shared_ptr<monero_transfer>> transfers;
     for (const std::shared_ptr<monero_tx_wallet>& tx : txs) {
 
@@ -3654,6 +3661,8 @@ namespace monero {
     }
     MTRACE("monero_wallet_full.cpp get_transfers() returning " << transfers.size() << " transfers");
 
+    // free query and return transfers
+    monero_utils::free(tx_query);
     return transfers;
   }
 
@@ -3683,6 +3692,7 @@ namespace monero {
       }
     }
     if (_query->m_tx_query == boost::none) _query->m_tx_query = std::make_shared<monero_tx_query>();
+    std::shared_ptr<monero_tx_query> tx_query = _query->m_tx_query.get();
 
     // get output data from wallet2
     tools::wallet2::transfer_container outputs_w2;
@@ -3717,6 +3727,9 @@ namespace monero {
       // remove txs without outputs
       if (tx->m_outputs.empty() && tx->m_block != boost::none) tx->m_block.get()->m_txs.erase(std::remove(tx->m_block.get()->m_txs.begin(), tx->m_block.get()->m_txs.end(), tx), tx->m_block.get()->m_txs.end()); // TODO, no way to use const_iterator?
     }
+
+    // free query and return outputs
+    monero_utils::free(tx_query);
     return outputs;
   }
 
diff --git a/test/sample_code.cpp b/test/sample_code.cpp
index 8648bcf..f2013d4 100644
--- a/test/sample_code.cpp
+++ b/test/sample_code.cpp
@@ -2,6 +2,7 @@
 #include <iostream>
 #include "wallet2.h"
 #include "wallet/monero_wallet_full.h"
+#include "utils/monero_utils.h"
 
 using namespace std;
 
@@ -52,23 +53,27 @@ int main(int argc, const char* argv[]) {
   // query a transaction by hash
   monero_tx_query tx_query;
   tx_query.m_hash = "314a0f1375db31cea4dac4e0a51514a6282b43792269b3660166d4d2b46437ca";
-  shared_ptr<monero_tx_wallet> tx = wallet_restored->get_txs(tx_query)[0];
+  vector<shared_ptr<monero_tx_wallet>> txs = wallet_restored->get_txs(tx_query);
+  shared_ptr<monero_tx_wallet> tx = txs[0];
   for (const shared_ptr<monero_transfer> transfer : tx->get_transfers()) {
     bool is_incoming = transfer->is_incoming().get();
     uint64_t in_amount = transfer->m_amount.get();
     int account_index = transfer->m_account_index.get();
   }
+  monero_utils::free(txs);
 
   // query incoming transfers to account 1
   monero_transfer_query transfer_query;
   transfer_query.m_is_incoming = true;
   transfer_query.m_account_index = 1;
   vector<shared_ptr<monero_transfer>> transfers = wallet_restored->get_transfers(transfer_query);
+  monero_utils::free(transfers);
 
   // query unspent outputs
   monero_output_query output_query;
   output_query.m_is_spent = false;
   vector<shared_ptr<monero_output_wallet>> outputs = wallet_restored->get_outputs(output_query);
+  monero_utils::free(outputs);
 
   // create and sync a new wallet with a random seed
   wallet_config = monero_wallet_config();
@@ -114,6 +119,7 @@ int main(int argc, const char* argv[]) {
   tx_config.m_relay = true;
   shared_ptr<monero_tx_wallet> sent_tx = wallet_restored->create_tx(tx_config);
   bool in_pool = sent_tx->m_in_tx_pool.get();  // true
+  monero_utils::free(sent_tx);
 
   // mine with 7 threads to push the network along
   int num_threads = 7;
@@ -144,6 +150,7 @@ int main(int argc, const char* argv[]) {
   shared_ptr<monero_tx_wallet> created_tx = wallet_restored->create_tx(tx_config);
   uint64_t fee = created_tx->m_fee.get(); // "Are you sure you want to send ...?"
   wallet_restored->relay_tx(*created_tx); // recipient receives notification within 5 seconds
+  monero_utils::free(created_tx);
 
   // the recipient wallet will be notified
   if (FUNDS_RECEIVED) cout << "Sample code completed successfully" << endl;
@@ -152,4 +159,6 @@ int main(int argc, const char* argv[]) {
   // save and close the wallets
   wallet_restored->close(true);
   wallet_random->close(true);
+  delete wallet_restored;
+  delete wallet_random;
 }
diff --git a/test/scratchpad.cpp b/test/scratchpad.cpp
index 03b6803..d172c46 100644
--- a/test/scratchpad.cpp
+++ b/test/scratchpad.cpp
@@ -2,6 +2,7 @@
 #include <iostream>
 #include "wallet2.h"
 #include "wallet/monero_wallet_full.h"
+#include "utils/monero_utils.h"
 
 using namespace std;
 
@@ -29,13 +30,26 @@ int main(int argc, const char* argv[]) {
   int network_type = 2;
 
   // load wallet
-  monero_wallet* wallet = monero_wallet_full::open_wallet("../../test_wallets/test_wallet_1", "supersecretpassword123", monero_network_type::STAGENET);
-  wallet->set_daemon_connection("http://localhost:38081", "", "");
+  monero_wallet* wallet = monero_wallet_full::open_wallet("../../test_wallets/test_wallet_1", "supersecretpassword123", monero_network_type::TESTNET);
+  wallet->set_daemon_connection("http://localhost:28081", "", "");
 
-  // fetch txs
+  // get txs
   vector<shared_ptr<monero_tx_wallet>> txs = wallet->get_txs();
-  MINFO("Wallet has " << txs.size() << " txs.  Printing some.");
-  for (int i = 0; i < txs.size() && i < 10; i++) {
-    MINFO(txs[i]->serialize());
-  }
+  MINFO("Wallet has " << txs.size() << " txs");
+  for (int i = 0; i < txs.size() && i < 10; i++) MINFO(txs[i]->serialize());
+  monero_utils::free(txs);
+
+  // get transfers
+  vector<shared_ptr<monero_transfer>> transfers = wallet->get_transfers(monero_transfer_query());
+  MINFO("Wallet has " << transfers.size() << " transfers");
+  monero_utils::free(transfers);
+
+  // get outputs
+  vector<shared_ptr<monero_output_wallet>> outputs = wallet->get_outputs(monero_output_query());
+  MINFO("Wallet has " << outputs.size() << " outputs");
+  monero_utils::free(outputs);
+
+  // close wallet and free pointer
+  wallet->close(true);
+  delete wallet;
 }