diff --git a/lib/cmd/run/transmitter.go b/lib/cmd/run/transmitter.go
index be8719d..61ffb24 100644
--- a/lib/cmd/run/transmitter.go
+++ b/lib/cmd/run/transmitter.go
@@ -60,6 +60,15 @@ func (t *Transmitter) Broadcast(txsMap map[int]types.Transactions) error {
 						if err != nil {
 							// Check for transient errors to retry
 							errMsg := err.Error()
+
+							// Nonce too low or already known: tx was already included
+							// on-chain or replaced, safe to skip and move on
+							if strings.Contains(errMsg, "nonce too low") ||
+								strings.Contains(errMsg, "already known") {
+								break
+							}
+
+							// Transient errors: retry with backoff
 							if strings.Contains(errMsg, "txpool is full") ||
 								strings.Contains(errMsg, "Too Many Requests") ||
 								strings.Contains(errMsg, "429") ||