diff --git a/src/api.ml b/src/api.ml
index ede981d6..96c11e50 100644
--- a/src/api.ml
+++ b/src/api.ml
@@ -1086,3 +1086,48 @@ module ZeroLimitedOperation = struct
     |> mem "operation_type" Account_operation.jsont ~enc:operation_type
     |> finish
 end
+
+module RegexAccountRestriction = struct
+  type t = {
+    payto_regex: string;
+    human_hint: string;
+    (* Map from IETF BCP 47 language tags to localized human hints. *)
+    human_hint_i18n: string option;
+  }
+
+  let jsont =
+    let make payto_regex human_hint human_hint_i18n =
+      { payto_regex; human_hint; human_hint_i18n }
+    in
+    let payto_regex v = v.payto_regex in
+    let human_hint v = v.human_hint in
+    let human_hint_i18n v = v.human_hint_i18n in
+    let open Jsont.Object in
+    map ~kind:"RegexAccountRestriction" make
+    |> mem "payto_regex" Jsont.string ~enc:payto_regex
+    |> mem "human_hint" Jsont.string ~enc:human_hint
+    |> opt_mem "human_hint_i18n" Jsont.string ~enc:human_hint_i18n
+    |> finish
+end
+
+module AccountRestriction = struct
+  type t =
+    | Deny
+    | Regex of RegexAccountRestriction.t
+
+  let of_regex v = Regex v
+  let of_deny () = Deny
+
+  let jsont =
+    let open Jsont.Object in
+    let regex = Case.map "regex" RegexAccountRestriction.jsont ~dec:of_regex in
+    let deny = Case.map "deny" Jsont.ignore ~dec:of_deny in
+    let enc_case = function
+      | Regex v -> Case.value regex v
+      | Deny -> Case.value deny ()
+    in
+    let cases = Case.[ make regex; make deny ] in
+    map ~kind:"AccountRestriction" Fun.id
+    |> case_mem "type" Jsont.string ~enc:Fun.id ~enc_case cases
+    |> finish
+end