diff --git a/app/src/state/modals.tsx b/app/src/state/modals.tsx
new file mode 100644
index 0000000..12e1d19
--- /dev/null
+++ b/app/src/state/modals.tsx
@@ -0,0 +1,112 @@
+import type { JSX, PropsWithChildren } from "react";
+import { createContext, useCallback, useContext, useMemo, useRef, useState } from "react";
+import { useWallet, type WalletName } from "@/state/wallet";
+
+export type CheckoutStep = "review" | "pending" | "success";
+
+interface ModalContextValue {
+  isWalletSheetOpen: boolean;
+  isCheckoutSheetOpen: boolean;
+  checkoutListingId: number | null;
+  checkoutStep: CheckoutStep;
+  requestBuy: (listingId: number) => void;
+  openWalletConnect: () => void;
+  connectWallet: (wallet: WalletName) => void;
+  closeWalletSheet: () => void;
+  closeCheckoutSheet: () => void;
+  confirmOrder: () => void;
+}
+
+const ModalContext = createContext<ModalContextValue | null>(null);
+
+export function ModalProvider({ children }: PropsWithChildren): JSX.Element {
+  const { connected, connect } = useWallet();
+  const [isWalletSheetOpen, setWalletSheetOpen] = useState(false);
+  const [isCheckoutSheetOpen, setCheckoutSheetOpen] = useState(false);
+  const [checkoutListingId, setCheckoutListingId] = useState<number | null>(null);
+  const [checkoutStep, setCheckoutStep] = useState<CheckoutStep>("review");
+  const pendingListingId = useRef<number | null>(null);
+
+  const requestBuy = useCallback(
+    (listingId: number) => {
+      if (connected) {
+        setCheckoutListingId(listingId);
+        setCheckoutStep("review");
+        setCheckoutSheetOpen(true);
+      } else {
+        pendingListingId.current = listingId;
+        setWalletSheetOpen(true);
+      }
+    },
+    [connected],
+  );
+
+  const openWalletConnect = useCallback(() => {
+    pendingListingId.current = null;
+    setWalletSheetOpen(true);
+  }, []);
+
+  const connectWallet = useCallback(
+    (wallet: WalletName) => {
+      connect(wallet);
+      setWalletSheetOpen(false);
+      const listingId = pendingListingId.current;
+      pendingListingId.current = null;
+      if (listingId !== null) {
+        setCheckoutListingId(listingId);
+        setCheckoutStep("review");
+        setCheckoutSheetOpen(true);
+      }
+    },
+    [connect],
+  );
+
+  const closeWalletSheet = useCallback(() => {
+    setWalletSheetOpen(false);
+    pendingListingId.current = null;
+  }, []);
+
+  const closeCheckoutSheet = useCallback(() => {
+    setCheckoutSheetOpen(false);
+  }, []);
+
+  const confirmOrder = useCallback(() => {
+    setCheckoutStep("pending");
+    setTimeout(() => setCheckoutStep("success"), 2200);
+  }, []);
+
+  const value = useMemo<ModalContextValue>(
+    () => ({
+      isWalletSheetOpen,
+      isCheckoutSheetOpen,
+      checkoutListingId,
+      checkoutStep,
+      requestBuy,
+      openWalletConnect,
+      connectWallet,
+      closeWalletSheet,
+      closeCheckoutSheet,
+      confirmOrder,
+    }),
+    [
+      isWalletSheetOpen,
+      isCheckoutSheetOpen,
+      checkoutListingId,
+      checkoutStep,
+      requestBuy,
+      openWalletConnect,
+      connectWallet,
+      closeWalletSheet,
+      closeCheckoutSheet,
+      confirmOrder,
+    ],
+  );
+
+  return <ModalContext.Provider value={value}>{children}</ModalContext.Provider>;
+}
+
+export function useModals(): ModalContextValue {
+  const ctx = useContext(ModalContext);
+  if (!ctx) throw new Error("useModals must be used within a ModalProvider");
+  return ctx;
+}