feat: crypto payment system with HD wallets, Freedom.st integration, and checkout UI

apps/pay/src/freedom.ts

@@ -0,0 +1,28 @@
+const API = process.env.FREEDOM_API ?? "https://api-v1.freedom.st";
+
+export async function getChainInfo(): Promise<Record<string, any>> {
+  const res = await fetch(`${API}/rpc/info`);
+  return res.json();
+}
+
+export async function getExchangeRates(): Promise<Record<string, number>> {
+  const res = await fetch(`${API}/invoice/rates`);
+  return res.json();
+}
+
+export async function getAddressInfo(address: string): Promise<any> {
+  const res = await fetch(`${API}/address/${address}`);
+  return res.json();
+}
+
+export function getQrUrl(text: string): string {
+  return `${API}/invoice/qr/${encodeURIComponent(text)}`;
+}
+
+/** Returns coin keys where the chain is online (no null uptime field). */
+export async function getAvailableCoins(): Promise<string[]> {
+  const info = await getChainInfo();
+  return Object.entries(info)
+    .filter(([_, v]) => v && v.uptime != null)
+    .map(([k]) => k);
+}