Built by one person.
TellersWindow is a portfolio dashboard for a portfolio you already hold. One workspace file carries the positions, the quotes and the ledger; one balance file carries the history the charts draw. Replace them and the whole product reads yours.
What the build does
What the build does, and what it deliberately does not have.
One live price call
The feed calls CoinGecko for BTC/ETH/SOL/ADA prices with an 8-second abort and a deterministic fallback, then reports which branch answered. It reports a status; it never publishes a second set of numbers for the portfolio.
Memoized Recharts
Chart series are memoized and aggregated so mobile scrolling stays smooth instead of re-rendering every point on each tick.
No certification claimed
This is not SOC 2 certified and has no 2FA. The only secret a deployment holds is the payment provider’s key, and that stays on the server.
Risk metrics, computed locally
Sharpe, Sortino, and max drawdown are calculated in the browser, on the same points the chart draws. The card reports them; it does not watch for them — no alerts and no anomaly detection.
Typed internal API
Route handlers are wrapped in error-boundary, rate-limit, and short-cache middleware, and the examples on the API page are rendered from those same handlers.
Your data, your file
The portfolio is one workspace file and one balance file in the project. Replace them, rebuild, and the whole product reads yours — the dashboard, the charts, the API and the exports.
How It Works
Three steps, no signup: open the dashboard, read the charts, watch the feed fall back.
Open the dashboard
No login, no account linking. The dashboard opens on the workspace the deployment is configured with, and every figure on it comes from that workspace.
Read the charts
Allocation, performance, and risk metrics are derived from the workspace and recomputed client-side.
Watch the feed fall back
The price feed hits CoinGecko inside an 8-second budget. If it times out or fails, the workspace’s own quotes answer and the page says which branch it got.
One person built this
No company behind it and no team. What is here is the product itself: the dashboard, the data layer and the pages, running on a workspace file you can replace — plus a setup service, for anyone who would rather have it pointed at their own holdings.
What is and isn't here
Real
- Dashboard UI with allocation, performance, and risk charts
- Live CoinGecko call for the feed’s status, with abort + fallback
- Typed API routes wrapped in error, rate-limit, and cache middleware
- Memoized Recharts series for smooth mobile scrolling
- One workspace file and one balance file, both replaceable
Not real
- No brokerage connection, Plaid, or OAuth of any kind
- No SOC 2, no 2FA, no encryption-at-rest claim
- The market table is the workspace’s own quotes, not a live feed
- No brokerage accounts, no client assets, no assets under management
Built by Adeshpreet Singh — full engineering breakdown.
Common Questions
Find answers to frequently asked questions about Tellers Window.
No. TellersWindow is a dashboard for a portfolio you already hold. It connects to no brokerage, holds no client money, and is not a regulated financial service. The one thing it sells is a setup service — the dashboard, pointed at your own holdings.
Open the dashboard. Nothing to sign up for.
It opens on the workspace this deployment is configured with. There is no trial, no account, and no sales call behind it.