diff --git a/src/exchange/taler-exchange-httpd_batch-deposit.c b/src/exchange/taler-exchange-httpd_batch-deposit.c
index cc0e71312..7a3ea0fa4 100644
--- a/src/exchange/taler-exchange-httpd_batch-deposit.c
+++ b/src/exchange/taler-exchange-httpd_batch-deposit.c
@@ -526,7 +526,7 @@ parse_coin (struct MHD_Connection *connection,
             TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_FORBIDDEN,
                                         TALER_EC_EXCHANGE_DEPOSIT_COIN_SIGNATURE_INVALID,
-                                        NULL))
+                                        TALER_B2S (&deposit->coin.coin_pub)))
       ? GNUNET_NO
       : GNUNET_SYSERR;
   }
diff --git a/src/exchange/taler-exchange-httpd_keys.c b/src/exchange/taler-exchange-httpd_keys.c
index 30c336539..b4f4bacfb 100644
--- a/src/exchange/taler-exchange-httpd_keys.c
+++ b/src/exchange/taler-exchange-httpd_keys.c
@@ -1852,6 +1852,8 @@ create_krd (struct TEH_KeyStateHandle *ksh,
   keys = GNUNET_JSON_PACK (
     GNUNET_JSON_pack_string ("version",
                              EXCHANGE_PROTOCOL_VERSION),
+    GNUNET_JSON_pack_string ("base_url",
+                             TEH_base_url),
     GNUNET_JSON_pack_string ("currency",
                              TEH_currency),
     GNUNET_JSON_pack_data_auto ("master_public_key",