diff --git a/crawlers/moonstreamcrawlers/cli.py b/crawlers/moonstreamcrawlers/cli.py
index 6ab869f0..d87b4a38 100644
--- a/crawlers/moonstreamcrawlers/cli.py
+++ b/crawlers/moonstreamcrawlers/cli.py
@@ -54,11 +54,12 @@ def ethcrawler_blocks_sync_handler(args: argparse.Namespace) -> None:
     """
     Synchronize latest Ethereum blocks with database.
     """
+    starting_block: int = args.start
     while True:
         bottom_block_number, top_block_number = get_latest_blocks(
             bool(strtobool(args.transactions))
         )
-        bottom_block_number = bottom_block_number + 1
+        bottom_block_number = max(bottom_block_number + 1, starting_block)
         if bottom_block_number >= top_block_number:
             print(
                 f"Synchronization is unnecessary for blocks {bottom_block_number}-{top_block_number - 1}"
@@ -178,6 +179,13 @@ def main() -> None:
         default="True",
         help="Add or not block transactions",
     )
+    parser_ethcrawler_blocks_sync.add_argument(
+        "-s",
+        "--start",
+        type=int,
+        default=0,
+        help="(Optional) Block to start synchronization from. Default: 0",
+    )
     parser_ethcrawler_blocks_sync.set_defaults(func=ethcrawler_blocks_sync_handler)
 
     parser_ethcrawler_blocks_add = subcommands_ethcrawler_blocks.add_parser(
diff --git a/crawlers/moonstreamcrawlers/esd.py b/crawlers/moonstreamcrawlers/esd.py
index e2be8c44..1a2fff6c 100644
--- a/crawlers/moonstreamcrawlers/esd.py
+++ b/crawlers/moonstreamcrawlers/esd.py
@@ -18,13 +18,18 @@ DB_MODELS = {
     "events": ESDEventSignature,
 }
 
-def crawl_step(db_session: Session, crawl_url: str, db_model: Union[ESDEventSignature, ESDFunctionSignature]) -> Optional[str]:
+
+def crawl_step(
+    db_session: Session,
+    crawl_url: str,
+    db_model: Union[ESDEventSignature, ESDFunctionSignature],
+) -> Optional[str]:
     attempt = 0
     current_interval = 2
     success = False
 
     response: Optional[requests.Response] = None
-    while (not success) and  attempt < 3:
+    while (not success) and attempt < 3:
         attempt += 1
         try:
             response = requests.get(crawl_url)
@@ -41,12 +46,21 @@ def crawl_step(db_session: Session, crawl_url: str, db_model: Union[ESDEventSign
     page = response.json()
     results = page.get("results", [])
 
-    rows = [db_model(id=row.get("id"), text_signature=row.get("text_signature"), hex_signature=row.get("hex_signature"), created_at=row.get("created_at")) for row in results]
+    rows = [
+        db_model(
+            id=row.get("id"),
+            text_signature=row.get("text_signature"),
+            hex_signature=row.get("hex_signature"),
+            created_at=row.get("created_at"),
+        )
+        for row in results
+    ]
     db_session.bulk_save_objects(rows)
     db_session.commit()
 
     return page.get("next")
 
+
 def crawl(crawl_type: str, interval: float) -> None:
     crawl_url: Optional[str] = CRAWL_URLS[crawl_type]
     db_model = DB_MODELS[crawl_type]
@@ -56,13 +70,26 @@ def crawl(crawl_type: str, interval: float) -> None:
             crawl_url = crawl_step(db_session, crawl_url, db_model)
             time.sleep(interval)
 
+
 def main():
-    parser = argparse.ArgumentParser(description="Crawls function and event signatures from the Ethereum Signature Database (https://www.4byte.directory/)")
-    parser.add_argument("crawl_type", choices=CRAWL_URLS, help="Specifies whether to crawl function signatures or event signatures")
-    parser.add_argument("--interval", type=float, default=0.1, help="Number of seconds to wait between requests to the Ethereum Signature Database API")
+    parser = argparse.ArgumentParser(
+        description="Crawls function and event signatures from the Ethereum Signature Database (https://www.4byte.directory/)"
+    )
+    parser.add_argument(
+        "crawl_type",
+        choices=CRAWL_URLS,
+        help="Specifies whether to crawl function signatures or event signatures",
+    )
+    parser.add_argument(
+        "--interval",
+        type=float,
+        default=0.1,
+        help="Number of seconds to wait between requests to the Ethereum Signature Database API",
+    )
     args = parser.parse_args()
 
     crawl(args.crawl_type, args.interval)
 
+
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()