Initial commit

lib/rates.ts

@@ -0,0 +1,55 @@
+import { z } from "zod";
+import { AssetDefinition } from "@/lib/assets";
+
+export interface RateAsset extends AssetDefinition {
+  usdPrice: number;
+  updatedAt: string;
+}
+
+export interface RatesResponse {
+  assets: RateAsset[];
+  quoteCurrency: "USD";
+  updatedAt: string;
+  sources: {
+    fiat: string;
+    crypto: string;
+  };
+}
+
+const rateAssetSchema = z.object({
+  code: z.string(),
+  name: z.string(),
+  type: z.enum(["fiat", "crypto"]),
+  symbol: z.string().optional(),
+  providerId: z.string().optional(),
+  popular: z.boolean().optional(),
+  decimals: z.number().optional(),
+  usdPrice: z.number().positive(),
+  updatedAt: z.string()
+});
+
+const ratesResponseSchema = z.object({
+  assets: z.array(rateAssetSchema),
+  quoteCurrency: z.literal("USD"),
+  updatedAt: z.string(),
+  sources: z.object({
+    fiat: z.string(),
+    crypto: z.string()
+  })
+});
+
+export function parseRatesResponse(payload: unknown): RatesResponse {
+  return ratesResponseSchema.parse(payload);
+}
+
+export function buildRateMap(assets: RateAsset[]): Map<string, RateAsset> {
+  return new Map(assets.map((asset) => [asset.code, asset]));
+}
+
+export function convertAmount(
+  amount: number,
+  fromAsset: RateAsset,
+  toAsset: RateAsset
+): number {
+  return amount * (fromAsset.usdPrice / toAsset.usdPrice);
+}