diff --git a/lib/ckb/api.rb b/lib/ckb/api.rb
index 31df7804..d8e1ebb4 100644
--- a/lib/ckb/api.rb
+++ b/lib/ckb/api.rb
@@ -231,6 +231,30 @@ def index_lock_hash(lock_hash, index_from: "0")
       Types::LockHashIndexState.from_h(state)
     end
 
+    # @param block_hash [String] 0x...
+    #
+    # @return [CKB::Types::BlockHeader]
+    def get_header(block_hash)
+      block_header_h = rpc.get_header(block_hash)
+      Types::BlockHeader.from_h(block_header_h)
+    end
+
+    # @param block_number [String | Integer]
+    #
+    # @return [CKB::Types::BlockHeader]
+    def get_header_by_number(block_number)
+      block_header_h = rpc.get_header_by_number(block_number.to_s)
+      Types::BlockHeader.from_h(block_header_h)
+    end
+
+    # @param block_hash [String] 0x...
+    #
+    # @return [CKB::Types::BlockReward]
+    def get_cellbase_output_capacity_details(block_hash)
+      block_reward_h = rpc.get_cellbase_output_capacity_details(block_hash)
+      Types::BlockReward.from_h(block_reward_h)
+    end
+
     def inspect
       "\#<API@#{rpc.uri}>"
     end
diff --git a/lib/ckb/rpc.rb b/lib/ckb/rpc.rb
index abc6a654..5a6dd235 100644
--- a/lib/ckb/rpc.rb
+++ b/lib/ckb/rpc.rb
@@ -143,6 +143,18 @@ def index_lock_hash(lock_hash, index_from: '0')
       rpc_request("index_lock_hash", params: [lock_hash, index_from.to_s])
     end
 
+    def get_header(block_hash)
+      rpc_request("get_header", params: [block_hash])
+    end
+
+    def get_header_by_number(block_number)
+      rpc_request("get_header_by_number", params: [block_number.to_s])
+    end
+
+    def get_cellbase_output_capacity_details(block_hash)
+      rpc_request("get_cellbase_output_capacity_details", params: [block_hash])
+    end
+
     def inspect
       "\#<RPC@#{uri}>"
     end