# Market screener

A React block (a whole screen) in [Beamline](https://beamline.io/)'s [Blocks](https://beamline.io/components/blocks) category. Live demo: https://beamline.io/components/market-screener

The whole market at a glance and a way to narrow it down: a sector heatmap, today's top movers with the market's breadth, ready-made screens (gainers, losers, most active, your watchlist) and a live table to search, sort and star markets into the watchlist.

## Use it for

- The markets overview of a trading or investing app: what moved, where, and which markets to watch or open.
- Finding markets by a few criteria and adding them to a watchlist.

## Not for

- Trading one market ([trading-terminal](https://beamline.io/components/trading-terminal)).
- Your own holdings and P&L ([portfolio](https://beamline.io/components/portfolio)).
- A sidebar market switcher ([watchlist](https://beamline.io/components/watchlist)).

## Anatomy

- header: title, feed state (live, or how old the prices are), search, and the ready-made screens as chips with counts
- heatmap: markets by sector, tile area by market cap, colour by the day's change; a tile picks the market
- movers: top gainers and losers of the screen in view, each with its change in words and glyph, and the breadth (advancing, flat, declining) as one bar
- table: star (watchlist), market, price, 24h change, 7-day trend, volume, market cap, sector; sortable, searchable; a row opens the market

## Variants

- **0**: room: heatmap above movers under 56rem, side by side from 56rem; the table keeps at least 22rem of height and the page scrolls past the overview on short screens

## States

- loading (heatmap, movers and table held in their shapes)
- live
- stale (prices older than a threshold: a warning chip says how old, values stay)
- feed error (says so, Retry; the last prices stay, marked stale)
- no matches for the search or screen (says which, clear)
- empty watchlist (how to add)
- unmeasured change or cap (hatched tile, — in the table)
- Breadth counts only measured changes as up, flat or down and names the unmeasured market count separately.

## Keyboard

- Screens: arrow keys move between chips
- Heatmap: arrow keys move between tiles, Enter picks
- Table: arrows move between cells, Enter opens the row's market; the star is a toggle button
- Search: / focuses it, Escape clears

## Motion

Prices change in place each tick; the movers re-rank only when a market's place changes, and the change values roll. The star fills on a short spring. Live market rows never slide. Nothing animates between ticks.

## Props

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `markets` (required) | `ScreenerMarket[]` | — | Ticker plus sector, market cap and volume; history for the 7-day trend. |
| `watchlist / defaultWatchlist / onWatchlistChange` | `string[]` | — | Starred symbols. |
| `screen / defaultScreen / onScreenChange` | `"all" \| "gainers" \| "losers" \| "active" \| "watchlist"` | — |  |
| `status` | `"loading" \| "live" \| "stale" \| "error"` | `"live"` |  |
| `updatedAt` | `number \| null` | — | When prices last arrived (ms); drives "12s old". |
| `onOpenMarket` | `(symbol: string) => void` | — | A heatmap tile or table row was chosen. |
| `onRetry` | `() => void` | — |  |
| `currency` | `string` | `"USD"` |  |
| `className / classNames / style / ref` | `string / MarketScreenerClassNames / CSSProperties / Ref<HTMLElement>` | — |  |

## Built from

- [market-heatmap](https://beamline.io/components/market-heatmap)
- [data-grid](https://beamline.io/components/data-grid)
- sparkline
- [category-bar](https://beamline.io/components/category-bar)
- [chip-group](https://beamline.io/components/chip-group)
- [search-field](https://beamline.io/components/search-field)
- [segmented-control](https://beamline.io/components/segmented-control)
- button
- badge
- [empty-state](https://beamline.io/components/empty-state)
- alert
- [slot-text](https://beamline.io/components/slot-text)

## Dependencies

`lucide-react`, `@tanstack/react-virtual`

## Import

```tsx
import { MarketScreener } from "@/blocks/market-screener/market-screener";
```

## Get it

Market screener is part of Beamline: 200+ components and 50+ complete screens for React that your coding agent (Claude Code, Codex, Cursor or any MCP client) installs into your app through Beamline's MCP server, as a ready-built package or as plain React source you can change. $49 launch price, one payment, no subscription, lifetime updates, one licence for your whole team. [Get Beamline](https://beamline.io/checkout?pack=complete) · [Connect your agent](https://beamline.io/connect)

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