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diff --git a/packages/taler-wallet-webextension/src/wallet/ExchangeSelection/index.ts b/packages/taler-wallet-webextension/src/wallet/ExchangeSelection/index.ts
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+++ b/packages/taler-wallet-webextension/src/wallet/ExchangeSelection/index.ts
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+/*
+ This file is part of GNU Taler
+ (C) 2022 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import { AbsoluteTime, AmountJson, ExchangeListItem } from "@gnu-taler/taler-util";
+import { Loading } from "../../components/Loading.js";
+import { HookError } from "../../hooks/useAsyncAsHook.js";
+import { ButtonHandler, SelectFieldHandler } from "../../mui/handlers.js";
+import { compose, StateViewMap } from "../../utils/index.js";
+import * as wxApi from "../../wxApi.js";
+import { useComponentState } from "./state.js";
+import { ComparingView, LoadingUriView, NoExchangesView, ReadyView } from "./views.js";
+
+
+
+export interface Props {
+  currency?: string;
+  onCancel: () => Promise<void>;
+  onSelection: (exchange: string) => Promise<void>;
+}
+
+export type State =
+  | State.Loading
+  | State.LoadingUriError
+  | State.Ready
+  | State.Comparing
+  | State.NoExchanges;
+
+export namespace State {
+
+  export interface Loading {
+    status: "loading";
+    error: undefined;
+  }
+
+  export interface LoadingUriError {
+    status: "loading-uri";
+    error: HookError;
+  }
+
+  export interface BaseInfo {
+    exchanges: SelectFieldHandler;
+    selected: ExchangeListItem;
+    nextFeeUpdate: AbsoluteTime;
+    error: undefined;
+  }
+
+  export interface NoExchanges {
+    status: "no-exchanges";
+    error: undefined;
+  }
+
+  export interface Ready extends BaseInfo {
+    status: "ready";
+    timeline: OperationMap<FeeDescription[]>;
+    onClose: ButtonHandler;
+  }
+
+  export interface Comparing extends BaseInfo {
+    status: "comparing";
+    pairTimeline: OperationMap<FeeDescriptionPair[]>;
+    onReset: ButtonHandler;
+    onSelect: ButtonHandler;
+  }
+}
+
+export type Operation = "deposit" | "withdraw" | "refresh" | "refund";
+export type OperationMap<T> = { [op in Operation]: T };
+
+
+const viewMapping: StateViewMap<State> = {
+  loading: Loading,
+  "loading-uri": LoadingUriView,
+  "comparing": ComparingView,
+  "no-exchanges": NoExchangesView,
+  "ready": ReadyView,
+};
+
+export const ExchangeSelectionPage = compose("Tip", (p: Props) => useComponentState(p, wxApi), viewMapping)
+
+export interface FeeDescription {
+  value: AmountJson;
+  from: AbsoluteTime;
+  until: AbsoluteTime;
+  fee?: AmountJson;
+}
+export interface FeeDescriptionPair {
+  value: AmountJson;
+  from: AbsoluteTime;
+  until: AbsoluteTime;
+  left?: AmountJson;
+  right?: AmountJson;
+}