From dd7b3d1af829360b0b5bb93494f01bfd3c9b69c1 Mon Sep 17 00:00:00 2001
From: Sale Djenic <aleksandardjenic@status.im>
Date: Tue, 28 May 2024 12:29:02 +0200
Subject: [PATCH] fix_: unblocking the router calculation if an approval is
 required for the gas estimation

---
 services/wallet/bridge/hop.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/services/wallet/bridge/hop.go b/services/wallet/bridge/hop.go
index a7406f433..5b1c42b6e 100644
--- a/services/wallet/bridge/hop.go
+++ b/services/wallet/bridge/hop.go
@@ -216,7 +216,14 @@ func (h *HopBridge) EstimateGas(fromNetwork *params.Network, toNetwork *params.N
 
 	estimation, err := ethClient.EstimateGas(context.Background(), msg)
 	if err != nil {
-		return 0, err
+		if !token.IsNative() {
+			// TODO: this is a temporary solution until we find a better way to estimate the gas
+			// hardcoding the estimation for other than ETH, cause we cannot get a proper estimation without having an approval placed first
+			// this is an error we're facing otherwise: `execution reverted: ERC20: transfer amount exceeds allowance`
+			estimation = 350000
+		} else {
+			return 0, err
+		}
 	}
 
 	increasedEstimation := float64(estimation) * IncreaseEstimatedGasFactor