> ## Documentation Index
> Fetch the complete documentation index at: https://docs.updown.fast/llms.txt
> Use this file to discover all available pages before exploring further.
# Placing interval orders
> The interval ticket, tap-to-buy, the trade dialog, how fills work, selling back, and error strings.
Interval orders fill instantly at the live quote. On desktop the ticket sits in the right rail of the market page. On a phone, and from any card's price button, it opens as a **trade dialog** with the live window chart on top.
## The ticket
At the top sit a **Buy / Sell** toggle and an order-type dropdown with **Quick Buy**, **Market**, and **Limit**.
### Quick Buy
Quick Buy is the default. Everything is a tap.
| Element | What it does |
| ----------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
| **▲ Up 51¢** / **▼ Down 49¢** | Pick a side. The status line reads "Pick Up or Down" until you do. |
| **$1 / $5 / \$10** | Each box shows the amount and what it wins ("win \$9.80"). Tap one to buy. The status line reads "Tap an amount to buy", then "Placing…". |
| **\$ Custom** | Type any amount and tap **Buy**. The "win \$X" figure updates as you type. |
The "win" figure is based on the prices actually available, so it is slightly less than the amount divided by the headline price whenever there is a spread.
### Market
| Element | What it does |
| ------------------------------------- | -------------------------------------------------------------------------------- |
| Side pill (**Up 51¢** / **Down 49¢**) | Pick the side. |
| **Dollars** | The amount to spend (default \$50). |
| **Odds** | The side's price read as a chance, "51% chance". |
| **Max payout** | Dollars divided by price, for example $98.04 on $50 at 51¢. |
| **Buy Up** / **Buy Down** | Places the order. In **Sell** mode the button reads **Sell Up** / **Sell Down**. |
### Limit
The Limit form is visible but **not yet available**. Its button is disabled, and the Portfolio **Orders** tab stays empty for the same reason.
## The trade dialog
On a phone, the market page shows docked **Buy Up 51¢** / **Buy Down 49¢** pills. Tapping one, or tapping a price button on any card anywhere in the app, opens the trade dialog: the live window chart with its **Target** pill on top, a line such as "Apple (AAPL) 15 min · \$331.67 target" with the countdown, and the same ticket as on desktop. An **Open market page** link goes to the full page. Signed out, the sign-in popup appears first.
## Confirmation
After a fill, a **Trade executed** card appears:
* Buys read "Bought $5.00 **Up** @ 51¢" and "Pays $9.80 if Up wins".
* Sells read "Sold $4.90 Up @ 49¢" and "+$0.40 realized", with "· settling…" while the payout confirms.
* A partial fill adds "Filled $X of your $Y — book was thin here".
The card stays open with the **take box** ("Add your take") until you **Post** or **Skip**. See [Profiles & social](/platform/profiles-and-social).
## How fills work
* **Taker fee.** A small fee applies on every buy and sell, never on settlement. It is built into the price you see; there is no fee line. It is largest near 50¢ and shrinks toward 1¢ and 99¢.
* **Spread.** At least 2¢, widening near 50/50 as the window runs out of time. The **win** and **Max payout** figures already include it.
* **Partial fills** happen when liquidity is thin. You are told what filled.
* **Price protection.** The app caps a buy at the shown price × 1.3 + 3¢ and floors a sell at the shown price × 0.7 − 3¢. If the average fill would breach that, the order is refused: "Price moved to 55¢ (above your 40¢ limit) — order not filled." Try again at the new price.
* **No minimum order** beyond a positive amount. Quick Buy starts at \$1.
## Selling back
You can close all or part of a position at any time before the window closes. You fill at the current **bid**, and the realized profit or loss is paid or collected immediately.
On the market page, tap **Sell** on your side's row in the **Live Positions** panel. This sells that side's whole position in the window.
Switch the order type to **Market** and the toggle to **Sell**, pick the side, enter **Dollars**, and tap **Sell Up** or **Sell Down**. The amount closes dollars divided by price contracts.
You cannot sell more than you hold. Once the window has closed, the position settles automatically.
## Errors you may see
| Message | Meaning |
| -------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------- |
| "Insufficient balance: need 5.00, have 2.10." | Not enough cash. Cash reserved by your other open windows does not count. |
| "Buying power is required to open a position." | Your available cash is zero. |
| "No liquidity available at these levels." | No liquidity is left at the quoted prices for this window. |
| "Price moved to … — order not filled." | Price protection refused the fill. Retry. |
| "You only hold N contracts on this side." | A sell exceeded your position. |
| "Market is not open for trading right now." | The stock market is closed. See [market hours](/interval/how-windows-work#market-hours). |
| "This market is closed to new positions. Open positions settle at the window's close." | The market has been retired. Existing positions still settle. |
| "We're upgrading the platform — trading and transfers are paused for a few minutes." | Maintenance. |
| "We're busy right now — try again in a few seconds." / "Another request on your account is still in progress — try again in a moment." | Temporary. Retry. |
The **Live Positions** panel marks your position at the current bid. The Portfolio page marks at the midpoint. A fresh buy looks roughly flat on Portfolio but slightly negative on the market page, and the two converge when you sell or settle.