get cake balance from bsc wallet

app/services/bsc_client.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+class BscClient
+  include HTTParty
+
+  base_uri "api-eu1.tatum.io/v3"
+
+  def initialize
+    @headers = {
+      "x-api-key": ENV["TATUM_API_KEY"],
+    }
+  end
+
+  def token_balance(token, token_decimals, wallet_address)
+    result = self.class.get(
+      "https://api-eu1.tatum.io/v3/blockchain/token/balance/BSC/#{token}/#{wallet_address}",
+      headers: @headers
+    ).parsed_response["balance"]
+
+    result.to_f / (10**token_decimals)
+  end
+end