api: add rpc MaxPriorityFeePerGas

internal/ethapi/api.go

@@ -69,6 +69,15 @@ func (s *PublicEthereumAPI) GasPrice(ctx context.Context) (*hexutil.Big, error)
 	return (*hexutil.Big)(tipcap), err
 }
 
+// MaxPriorityFeePerGas returns a suggestion for a gas tip cap for dynamic fee transactions.
+func (s *PublicEthereumAPI) MaxPriorityFeePerGas(ctx context.Context) (*hexutil.Big, error) {
+	tipcap, err := s.b.SuggestGasTipCap(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return (*hexutil.Big)(tipcap), err
+}
+
 // Syncing returns false in case the node is currently not syncing with the network. It can be up to date or has not
 // yet received the latest block headers from its pears. In case it is synchronizing:
 // - startingBlock: block number this node started to synchronise from
@@ -508,10 +517,10 @@ func (s *PublicBlockChainAPI) GetBalance(ctx context.Context, address common.Add
 }
 
 // GetBlockByNumber returns the requested canonical block.
-// * When blockNr is -1 the chain head is returned.
-// * When blockNr is -2 the pending chain head is returned.
-// * When fullTx is true all transactions in the block are returned, otherwise
-//   only the transaction hash is returned.
+//   - When blockNr is -1 the chain head is returned.
+//   - When blockNr is -2 the pending chain head is returned.
+//   - When fullTx is true all transactions in the block are returned, otherwise
+//     only the transaction hash is returned.
 func (s *PublicBlockChainAPI) GetBlockByNumber(ctx context.Context, number rpc.BlockNumber, fullTx bool) (map[string]interface{}, error) {
 	block, err := s.b.BlockByNumber(ctx, number)
 	if block != nil && err == nil {