> For the complete documentation index, see [llms.txt](https://ottodata.gitbook.io/ottodata-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ottodata.gitbook.io/ottodata-docs/concepts/overnight-and-weekend-gaps.md).

# Overnight & weekend gaps

## Overnight & weekend gaps

### What a "session" is

NASDAQ closes at 16:00 ET and reopens at 09:30 ET. Hood tokens keep trading in between. Otto slices that off-hours time into **sessions**:

* **Overnight** — close → next open (weeknights)
* **Weekend** — Friday close → Monday open

For every session and every ticker, Otto records how far the on-chain price wandered from the last NASDAQ close: the mean, min, max and final gap in basis points.

### The statistics

[`GET /v1/gaps/summary`](https://ottodata.gitbook.io/ottodata-docs/api-reference/gaps) aggregates the last N days per ticker:

```json
{
  "ticker": "AAPL",
  "overnight": {
    "n": 600,
    "mean_bps": 174.01,
    "min_bps": -55.78,
    "max_bps": 425.27,
    "last_bps": 22.9
  }
}
```

Read this as: over the sample, AAPL's on-chain price averaged a **+174 bps** premium to the last close during off-hours, peaking at +425 bps.

{% hint style="info" %}
A structural premium is expected: the Chainlink feed is a total-return price (dividends reinvested), so it sits above the raw close even with zero overnight news. The interesting signal is the *variation* — sessions where the gap blows out beyond its usual range.
{% endhint %}

### Live view

[`GET /v1/gaps/live`](https://ottodata.gitbook.io/ottodata-docs/api-reference/gaps) answers "what's moving *right now*?" during off-hours: every ticker ranked by current gap vs last close. During market hours it returns `{"session": "regular"}`.

### Session history

[`GET /v1/gaps/{ticker}`](https://ottodata.gitbook.io/ottodata-docs/api-reference/gaps) returns one row per session — useful for studying how a specific ticker behaves overnight vs weekends, or around earnings.


---

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