diff --git a/src/http_info.ml b/src/http_info.ml
index 21a6943a..53039402 100644
--- a/src/http_info.ml
+++ b/src/http_info.ml
@@ -32,44 +32,32 @@ let mk_keys ~db_conn (module Keys : Keys.S) ~last_issue_date =
   let stefan_abs = Config.stefan_abs in
   let stefan_log = Config.stefan_log in
   let stefan_lin = Config.stefan_lin in
-  (* todo asset_type
-     Type of the asset. "fiat", "crypto", "regional" or "stock". *)
-  let asset_type = "xxx" in
+  (* type of the asset. "fiat", "crypto", "regional" or "stock". *)
+  let asset_type = "fiat" in
   let* accounts = Pg.get_wire_accounts db_conn () |> unwrap_err_caqti in
   let* wire_fees =
-    (* todo
-       where does wire_methods comes from? *)
-    let wire_method = "xxx" in
+    (* wire_methods? *)
+    let wire_method = "x-taler-bank" in
     let+ wire_fees =
       Pg.get_wire_fees db_conn ~wire_method |> unwrap_err_caqti
     in
     String_map.singleton wire_method wire_fees
   in
-  let wads =
-    (* TODO wads *)
-    []
-  in
+  let wads = [] in
   let rewards_allowed = false in
   let kyc_enabled = false in
-  let disable_direct_deposit = (* todo *) false in
+  let disable_direct_deposit = false in
   let master_public_key = Config.master_public_key in
   let reserve_closing_delay = Config.Exchangedb.idle_reserve_expiration_time in
-  (* todo *)
   let wallet_balance_limit_without_kyc = None in
   let hard_limits = [] in
   let zero_limits = [] in
 
   let* denom_l = Keys.denominations () in
-  let denom_l =
-    (* reverse chronological order *)
-    List.sort
-      (fun a b -> Stdlib.compare b.Denomination.stamp_start a.stamp_start)
-      denom_l
-  in
   let list_issue_date =
-    match denom_l with
-    | [] -> Timestamp.zero
-    | dn :: _ -> dn.Denomination.stamp_start
+    List.fold_left
+      (fun acc dn -> Timestamp.max acc dn.Denomination.stamp_start)
+      Timestamp.zero denom_l
   in
   let denom_l =
     (* if `?last_issue_date` query param does not exactly match the `stamp_start`
@@ -95,13 +83,7 @@ let mk_keys ~db_conn (module Keys : Keys.S) ~last_issue_date =
   let* denominations = Denomination.make_denom_group_sorted denom_l in
 
   let* signkeys = Keys.signkeys () in
-  let signkeys =
-    signkeys
-    |> List.sort (fun a b ->
-        let open Signkey in
-        Stdlib.compare b.stamp_start a.stamp_start)
-    |> List.map Api.SignKey.of_signkey
-  in
+  let signkeys = List.map Api.SignKey.of_signkey signkeys in
 
   (* the eddsa pub key used to sign exchange_sig *)
   let* exchange_pub =
@@ -124,13 +106,12 @@ let mk_keys ~db_conn (module Keys : Keys.S) ~last_issue_date =
     signf (Keys.sign exchange_pub) R.{ list_issue_date; hc }
   in
 
-  let recoup = (* TODO /recoup *) [] in
+  let recoup = (* /recoup *) [] in
   let* global_fees =
     Pg.get_global_fees db_conn ~start_date:Timestamp.zero |> unwrap_err_caqti
   in
   let* auditors =
-    (* TODO /auditors/$AUDITOR_PUB/$H_DENOM_PUB *)
-    (* does not contains auditor_keys with empty denomination_keys *)
+    (* /auditors/$AUDITOR_PUB/$H_DENOM_PUB *)
     Pg.get_auditor_keys db_conn
   in
   let extensions = None in
diff --git a/src/time.ml b/src/time.ml
index 3c5af371..b1789951 100644
--- a/src/time.ml
+++ b/src/time.ml
@@ -99,6 +99,8 @@ module Timestamp = struct
   let never = uint64_max
   let zero = 0L
   let compare = Int64.unsigned_compare
+  let min a b = if compare a b < 0 then a else b
+  let max a b = if compare a b > 0 then a else b
 
   (* zero if a >= b; never if b=never; otherwise b - a *)
   let diff a b =
diff --git a/src/time.mli b/src/time.mli
index 544e92f9..9430b8a1 100644
--- a/src/time.mli
+++ b/src/time.mli
@@ -38,6 +38,8 @@ module Timestamp : sig
   val never : t
   val zero : t
   val compare : t -> t -> int
+  val min : t -> t -> t
+  val max : t -> t -> t
   val diff : t -> t -> Relative.t
   val of_s : int64 -> t