Support zero gas fee chains

Signed-off-by: Jim Zhang <jim.zhang@kaleido.io>
NomicFoundation · Apr 30, 2024 · 0bff8cc · 0bff8cc
1 parent fc90abf
commit 0bff8cc
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/packages/core/src/internal/execution/jsonrpc-client.ts b/packages/core/src/internal/execution/jsonrpc-client.ts
@@ -632,7 +632,14 @@ export class EIP1193JsonRpcClient implements JsonRpcClient {
     // We prioritize EIP-1559 fees over legacy gasPrice fees
     if (latestBlock.baseFeePerGas !== undefined) {
       // Logic copied from ethers v6
-      const maxPriorityFeePerGas = 1_000_000_000n; // 1gwei
+      let maxPriorityFeePerGas = 1_000_000_000n; // 1gwei
+
+      if (latestBlock.baseFeePerGas === 0n) {
+        // Support zero gas fee chains, such as a private instances
+        // of blockchains using Besu.
+        maxPriorityFeePerGas = 0n;
+      }
+
       const maxFeePerGas =
         latestBlock.baseFeePerGas * 2n + maxPriorityFeePerGas;