fix: estimateGas edge case

crates/rpc/rpc-eth-api/src/helpers/call.rs

@@ -888,7 +888,11 @@ pub trait Call: LoadState + SpawnBlocking {
             // Execute transaction and handle potential gas errors, adjusting limits accordingly.
             match self.transact(&mut db, env.clone()) {
                 Err(err) if err.is_gas_too_high() => {
-                    // Increase the lowest gas limit if gas is too high
+                    // Decrease the highest gas limit if gas is too high
+                    highest_gas_limit = mid_gas_limit;
+                }
+                Err(err) if err.is_gas_too_low() => {
+                    // Increase the lowest gas limit if gas is too low
                     lowest_gas_limit = mid_gas_limit;
                 }
                 // Handle other cases, including successful transactions.

crates/rpc/rpc-eth-api/src/helpers/error.rs

@@ -59,6 +59,16 @@ pub trait AsEthApiError {
 
         false
     }
+
+    /// Returns `true` if error is
+    /// [`RpcInvalidTransactionError::GasTooLow`](reth_rpc_eth_types::RpcInvalidTransactionError::GasTooLow).
+    fn is_gas_too_low(&self) -> bool {
+        if let Some(err) = self.as_err() {
+            return err.is_gas_too_low()
+        }
+
+        false
+    }
 }
 
 impl AsEthApiError for EthApiError {

crates/rpc/rpc-eth-types/src/error.rs

@@ -151,6 +151,11 @@ impl EthApiError {
     pub const fn is_gas_too_high(&self) -> bool {
         matches!(self, Self::InvalidTransaction(RpcInvalidTransactionError::GasTooHigh))
     }
+
+    /// Returns `true` if error is [`RpcInvalidTransactionError::GasTooLow`]
+    pub const fn is_gas_too_low(&self) -> bool {
+        matches!(self, Self::InvalidTransaction(RpcInvalidTransactionError::GasTooLow))
+    }
 }
 
 impl From<EthApiError> for jsonrpsee_types::error::ErrorObject<'static> {