> For the complete documentation index, see [llms.txt](https://graphdex-1.gitbook.io/graphdex-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://graphdex-1.gitbook.io/graphdex-docs/trading-predictions/order-book-and-chart.md).

# Order Book & Chart

**Two halves of the same decision — depth and history. Read both before you click.**

The chart tells you where the market has been. The order book tells you what you can actually trade right now. Together they let you decide whether the price you see is the price you'll get.

## The chart

On the left of the market page, the chart shows price or probability over time depending on market type.

* **Up/Down markets** — the underlying asset price (BTC, ETH, SOL, stocks). The chart shape is the asset's price; the market resolves on whether it ended Up or Down in the window.
* **Yes/No markets** — implied probability of the leading side over time. A line that climbs from 50% to 80% shows growing consensus.
* **Multi-outcome markets** — one line per outcome. Spain, France, Argentina, Italy each get a coloured line so you can see how the field is moving.

Standard chart controls: zoom, pan, timeframe switcher. The chart uses a TradingView-style widget; you can draw on it if needed.

### What to look for on the chart

* **A flat line at 50%** — no opinion is being priced. Either the market is too new or genuinely uncertain.
* **A line at an extreme (>95%)** — consensus is strong. Upside on the leading side is tiny; downside is asymmetric.
* **A line that just jumped sharply** — news event being priced. Check what happened before chasing.

## The order book

To the right of the chart sits the order book — bids and asks at every price level. It is the single most honest signal of what your fill will look like.

* **Asks (top half)** — sell orders waiting to be hit. The lowest ask is what you pay if you Buy market-now.
* **Bids (bottom half)** — buy orders waiting to be lifted. The highest bid is what you receive if you Sell market-now.
* **Spread** — the gap between top bid and lowest ask. Tight spread means real market-making.
* **Depth** — total size at each level. A market with $2 at the top of book is not a $2 market, but the size you can trade without slipping it.

### What to look for in the order book

* **Tight spread + deep book** — healthy market. Trade with confidence at posted prices.
* **Wide spread + thin book** — fragile market. Your fill quality will be poor. Consider a Limit order. See [Limit Orders](/graphdex-docs/trading-predictions/limit-orders.md).
* **One huge resting order** — a single counterparty is dominant. The market price is whatever they say it is until that order is filled.

### Clicking the book

Tap a price level to pre-fill that price into the Limit input on the trading widget. Useful for posting at a known level rather than typing.

## Combining the two

* **Chart shows uptrend, book is thin** — recent fills moved the price on tiny volume. Treat the trend with suspicion.
* **Chart shows uptrend, book is deep at the new high** — real demand. The price is sustainable.
* **Chart sat flat, book just got deep** — market-makers showed up. Liquidity event, watch for the next move.

{% hint style="warning" %}
The number you see in the Outcome column (e.g. "Yes 51%") is a top-of-book snapshot — not the price you will get for a $1000 order. Always cross-check against the book.
{% endhint %}

## FAQs

<details>

<summary>Why doesn't the chart show the price I see in the order book?</summary>

The chart is a time-series of fills; the book is what is resting right now. If no trade has happened recently, the chart lags the book.

</details>

<details>

<summary>Can I draw on the chart?</summary>

Yes — the chart widget supports basic drawing tools. Drawings are local to your browser session.

</details>

<details>

<summary>What does a "phantom" order at one price mean?</summary>

A single large resting order with no support around it. Usually a market-maker quoting one side. Be cautious — the price could move quickly if that order is filled or cancelled.

</details>


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