From 7ef523aaaebb431b684182907b1b24314dbdff12 Mon Sep 17 00:00:00 2001
From: Ben Hauser <ben@hauser.id>
Date: Tue, 30 Jan 2024 19:50:34 +0400
Subject: [PATCH 1/2] chore: set priority_fee as default behavior for live
 networks

---
 brownie/data/default-config.yaml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/brownie/data/default-config.yaml b/brownie/data/default-config.yaml
index fb997062b..a0c5ad16f 100644
--- a/brownie/data/default-config.yaml
+++ b/brownie/data/default-config.yaml
@@ -27,9 +27,9 @@ networks:
     live:
         gas_limit: auto
         gas_buffer: 1.1
-        gas_price: auto
+        gas_price: null
         max_fee: null
-        priority_fee: null
+        priority_fee: auto
         reverting_tx_gas_limit: false
         default_contract_owner: false
 

From f3c0dd9fd7b69061e50d1e4ec1b50d5bc5b0f20f Mon Sep 17 00:00:00 2001
From: Ben Hauser <ben@hauser.id>
Date: Tue, 30 Jan 2024 19:50:53 +0400
Subject: [PATCH 2/2] feat: use legacy-style gas if network does not support
 eip1559

---
 brownie/network/account.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/brownie/network/account.py b/brownie/network/account.py
index c1f70f708..df0cff4fd 100644
--- a/brownie/network/account.py
+++ b/brownie/network/account.py
@@ -728,7 +728,12 @@ def _make_transaction(
                 priority_fee = CONFIG.active_network["settings"]["priority_fee"] or None
 
         if priority_fee == "auto":
-            priority_fee = Chain().priority_fee
+            try:
+                priority_fee = Chain().priority_fee
+            except ValueError:
+                # fallback to legacy transactions if network does not support EIP1559
+                CONFIG.active_network["settings"]["priority_fee"] = None
+                priority_fee = None
 
         try:
             # if max fee and priority fee are not set, use gas price