Also store portfolio snapshots in USD

client/src/hooks/useHono.ts

@@ -2,7 +2,6 @@ import { useQuery } from '@tanstack/react-query'
 import { hc } from 'hono/client'
 import { Client } from 'server/hc'
 
-import { useCurrency } from './useCurrency'
 import { useQueues } from './useQueues'
 
 const url = new URL(window.location.origin)
@@ -109,19 +108,16 @@ export function useEthValuesByAccount() {
   })
 }
 
-export function useNetworthTimeSeries() {
-  const { currency } = useCurrency()
-  const { data: fiat } = useFiat()
-
+export function useNetworthTimeSeries(currency: string | undefined) {
   return useQuery({
-    queryKey: ['networthTimeSeries', currency, fiat],
+    queryKey: ['networthTimeSeries', currency],
     queryFn: async () => {
       const res = await honoClient.balances.networth.$get()
       const json = await res.json()
 
       return json.map((item) => ({
         ...item,
-        value: item.ethValue / (fiat?.getRate(currency) ?? 1),
+        value: currency === 'ETH' ? item.ethValue : (item.usdValue as number),
       }))
     },
   })

client/src/screens/Home.tsx

@@ -32,7 +32,7 @@ export function Home() {
   const { currency } = useCurrency()
   const { data: fiat } = useFiat()
   const ethValuesByAccount = useEthValuesByAccount()
-  const { data: networthTimeSeries } = useNetworthTimeSeries()
+  const { data: networthTimeSeries } = useNetworthTimeSeries(currency)
 
   return (
     <>
@@ -64,7 +64,7 @@ export function Home() {
           <div
             className={cn(
               'relative hidden w-full',
-              currency === 'ETH' &&
+              (currency === 'USD' || currency === 'ETH') &&
                 !!networthTimeSeries &&
                 networthTimeSeries.length > 5 &&
                 'lg:block'
@@ -116,6 +116,7 @@ export function Home() {
                           minute: 'numeric',
                         })
                       }}
+                      formatter={(value) => formatCurrency(value as number, currency ?? 'USD')}
                     />
                   }
                 />

server/src/app.ts

@@ -7,6 +7,7 @@ import { serveStatic } from 'hono/bun'
 import { api } from './api'
 import { db } from './db'
 import { addCheckBalanceTasksToQueue } from './handlers/balances'
+import { getRateToEth } from './price'
 import { erc20Queue } from './queues/workers/erc20'
 import { ethQueue } from './queues/workers/eth'
 
@@ -38,10 +39,28 @@ new Cron('0 */12 * * *', async () => {
     return
   }
 
+  const ethValue = balances.ethValue ?? 0
+
+  // Get the current ETH/USD rate (USDC rate to ETH, inverted)
+  let usdValue: number | null = null
+  try {
+    const usdcRateToEth = await getRateToEth({
+      address: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48', // USDC on mainnet
+      decimals: 6,
+      chainId: 1,
+    })
+    // Convert ETH value to USD: ethValue / usdcRateToEth
+    // (usdcRateToEth is how much ETH 1 USDC is worth, so we divide)
+    usdValue = ethValue / usdcRateToEth
+  } catch (error) {
+    console.error('Failed to get USD rate for networth snapshot:', error)
+  }
+
   await db
     .insertInto('networth')
     .values({
-      ethValue: balances.ethValue ?? 0,
+      ethValue,
+      usdValue,
     })
     .execute()
 

server/src/db/index.ts

@@ -48,6 +48,7 @@ interface BalanceRow {
 interface NetworthRow {
   timestamp: ColumnType<Date, never, string>
   ethValue: number
+  usdValue: number | null
 }
 
 export type Tables = {

server/src/db/migrations/003_usd_networth.ts

@@ -0,0 +1,13 @@
+import { Kysely, sql } from 'kysely'
+
+export const up = async (db: Kysely<any>) => {
+  // Add usdValue column to networth table
+  await db.schema
+    .alterTable('networth')
+    .addColumn('usdValue', 'real')
+    .execute()
+}
+
+export const down = async (db: Kysely<any>) => {
+  await db.schema.alterTable('networth').dropColumn('usdValue').execute()
+}

server/src/db/migrator.ts

@@ -6,8 +6,9 @@ import type { MigrationProvider } from 'kysely'
 // in both dev mode and single-file executable mode.
 import * as m1 from './migrations/001_initial_migrations'
 import * as m2 from './migrations/002_erc4626'
+import * as m3 from './migrations/003_usd_networth'
 
-const migrations = [m1, m2]
+const migrations = [m1, m2, m3]
 
 export const migrator: MigrationProvider = {
   async getMigrations() {

server/src/handlers/balances.ts

@@ -182,6 +182,7 @@ export async function getNetworthTimeSeries(c: Context) {
   const networth = await db
     .selectFrom('networth')
     .selectAll()
+    .where('usdValue', 'is not', null)
     .limit(60)
     .orderBy('timestamp', 'desc')
     .execute()