diff --git a/apps/block_scout_web/lib/block_scout_web/chain.ex b/apps/block_scout_web/lib/block_scout_web/chain.ex
index b1a3c3ec19..c8279652bf 100644
--- a/apps/block_scout_web/lib/block_scout_web/chain.ex
+++ b/apps/block_scout_web/lib/block_scout_web/chain.ex
@@ -31,6 +31,14 @@ defmodule BlockScoutWeb.Chain do
 
   alias Explorer.PagingOptions
 
+  defimpl Poison.Encoder, for: Decimal do
+    def encode(value, _opts) do
+      decimal = Decimal
+
+      [?\", decimal.to_string(value), ?\"]
+    end
+  end
+
   @page_size 50
   @default_paging_options %PagingOptions{page_size: @page_size + 1}
   @address_hash_len 40