diff --git a/.flake8 b/.flake8
new file mode 100644
index 00000000..e44b8108
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,2 @@
+[flake8]
+ignore = E501
diff --git a/.github/workflows/construction_native.yml b/.github/workflows/construction_native.yml
new file mode 100644
index 00000000..e7c6795f
--- /dev/null
+++ b/.github/workflows/construction_native.yml
@@ -0,0 +1,29 @@
+name: Test construction (native currency)
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  localnet:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.11
+
+      - uses: actions/checkout@v4
+
+      - name: Install mesh-cli
+        run: |
+          curl -sSfL https://raw.githubusercontent.com/coinbase/mesh-cli/master/scripts/install.sh | sh -s
+
+      - name: Build rosetta
+        run: |
+          cd cmd/rosetta && go build .
+
+      - name: Smoke test
+        run: |
+          cd cmd/rosetta && ./rosetta --version
+          rosetta-cli version
diff --git a/systemtests/devnet-construction.ros b/systemtests/devnet-construction.ros
index d47d7cea..cb74afba 100644
--- a/systemtests/devnet-construction.ros
+++ b/systemtests/devnet-construction.ros
@@ -12,12 +12,22 @@ transfer(1){
       }
     };
 
+    max_fee = "50000000000000";
     max_transfer_amount = "10000000000000000";
     recipient_amount = random_number({"minimum": "1", "maximum": {{max_transfer_amount}}});
 
     print_message({"recipient_amount":{{recipient_amount}}});
 
     sender_amount = 0-{{recipient_amount}};
+    recipient = {
+      "account_identifier": {
+        "address": "erd1xtslmt67utuewwv8jsx729mxjxaa8dvyyzp7492hy99dl7hvcuqq30l98v"
+      },
+      "currency": {
+          "symbol": "EGLD",
+          "decimals": 18
+      }
+    };
     transfer.confirmation_depth = "10";
     transfer.operations = [
       {
@@ -28,10 +38,17 @@ transfer(1){
           "value":{{sender_amount}},
           "currency":{{native_currency}}
         }
+      },
+      {
+        "operation_identifier":{"index":1},
+        "related_operations": [{"index": 0}],
+        "type":"Transfer",
+        "account":{{recipient.account_identifier}},
+        "amount":{
+          "value":{{recipient_amount}},
+          "currency":{{native_currency}}
+        }
       }
     ];
-    transfer.preprocess_metadata = {
-      "receiver": "erd1qyu5wthldzr8wx5c9ucg8kjagg0jfs53s8nr3zpz3hypefsdd8ssycr6th" 
-    };
   }
 }
diff --git a/systemtests/proxy_to_observer_adapter.py b/systemtests/proxy_to_observer_adapter.py
new file mode 100644
index 00000000..0ae78528
--- /dev/null
+++ b/systemtests/proxy_to_observer_adapter.py
@@ -0,0 +1,111 @@
+import logging
+from argparse import ArgumentParser
+from typing import Any
+
+import requests
+from bottle import Bottle, request, response  # type: ignore
+
+app: Any = Bottle()
+
+
+class Configuration:
+    def __init__(self):
+        self.shard = 0
+        self.proxy = ""
+
+
+configuration = Configuration()
+
+logging.basicConfig(level=logging.DEBUG)
+
+
+@app.route("/node/status")
+def get_node_status() -> Any:
+    url = f"{configuration.proxy}/network/status/{configuration.shard}"
+    logging.info(f"get_node_status(): {url}")
+
+    proxy_response = requests.get(url)
+    proxy_response.raise_for_status()
+    proxy_response_json = proxy_response.json()
+
+    proxy_response_json["data"]["metrics"] = proxy_response_json["data"]["status"]
+    proxy_response_json["data"]["metrics"]["erd_app_version"] = "v1.2.3"
+    proxy_response_json["data"]["metrics"]["erd_public_key_block_sign"] = "abba"
+    del proxy_response_json["data"]["status"]
+
+    return proxy_response_json
+
+
+@app.route("/node/epoch-start/<epoch:int>")
+def get_epoch_start(epoch: int) -> Any:
+    url = f"{configuration.proxy}/network/epoch-start/{configuration.shard}/by-epoch/{epoch}"
+    logging.info(f"get_epoch_start(): {url}")
+
+    proxy_response = requests.get(url)
+    proxy_response.raise_for_status()
+    return proxy_response.json()
+
+
+@app.route("/block/by-nonce/<nonce:int>")
+def get_block_by_nonce(nonce: int) -> Any:
+    url = f"{configuration.proxy}/block/{configuration.shard}/by-nonce/{nonce}"
+    logging.info(f"get_block_by_nonce(): {url}")
+
+    params: Any = dict(request.query)  # type: ignore
+    proxy_response = requests.get(url, params=params)
+    proxy_response.raise_for_status()
+    return proxy_response.json()
+
+
+@app.route("/address/<address>/esdt/<token>")
+def get_account_esdt(address: str, token: str) -> Any:
+    url = f"{configuration.proxy}/address/{address}/esdt/{token}"
+    logging.info(f"get_account_esdt(): {url}")
+
+    params: Any = dict(request.query)  # type: ignore
+    proxy_response = requests.get(url, params=params)
+    proxy_response.raise_for_status()
+    return proxy_response.json()
+
+
+@app.route("/address/<address>")
+def get_account(address: str) -> Any:
+    url = f"{configuration.proxy}/address/{address}"
+    logging.info(f"get_account(): {url}")
+
+    params: Any = dict(request.query)  # type: ignore
+    proxy_response = requests.get(url, params=params)
+    proxy_response_json = proxy_response.json()
+    proxy_response.raise_for_status()
+
+    return proxy_response_json
+
+
+@app.route("/transaction/send", method="POST")
+def send_transaction():
+    url = f"{configuration.proxy}/transaction/send"
+    logging.info(f"send_transaction(): {url}")
+
+    data = request.json
+    proxy_response = requests.post(url, json=data)
+    proxy_response_json = proxy_response.json()
+
+    response.status = proxy_response.status_code
+
+    return proxy_response_json
+
+
+def main():
+    parser = ArgumentParser()
+    parser.add_argument("--proxy", default="https://devnet-gateway.multiversx.com")
+    parser.add_argument("--shard", type=int, default=0)
+    args = parser.parse_args()
+
+    configuration.proxy = args.proxy
+    configuration.shard = args.shard
+
+    app.run(host="localhost", port=8080)
+
+
+if __name__ == "__main__":
+    main()