> For the complete documentation index, see [llms.txt](https://docs.asterdex.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.asterdex.com/trading/prediction.md).

# Prediction

### Overview

Predictions is Aster’s prediction market product, allowing users to trade on the outcome of future events, with each event resolving with a defined time window\.Each event contains multiple independent markets, where every market represents a separate session with its own order book, settlement time, and trading activity.

Users trade prediction shares priced between 0.01 and 0.99 USDT. These prices represent the market-implied probability of an outcome occurring.

Example:

* Up price = 0.54
* Implied probability = 54%

At settlement:

* Settlement fee is 0.05%, only on winning shares. 
* Losing shares settle to 0

Settlement is determined using the underlying spot index price.

***

### How It Works

#### Settlement Rules

Each market has a target price determined by the index price snapshot taken at the market opening.

At settlement:

* If the settlement index price ≥ target price, Up wins
* If the settlement index price < target price, Down wins

The settlement reference uses the underlying spot index price, not the traded contract/share price.

***

#### Share Prices & Probability

Predictions shares trade between 0.01 and 0.99 USDT.

The share price represents the market-implied probability for that outcome.

Example:

* Share price = 0.5397
* Implied probability ≈ 54%

***

#### Market Lifecycle

Each prediction market goes through several stages:

| Status            | Description                                                     |
| ----------------- | --------------------------------------------------------------- |
| Upcoming          | Market window hasn't started yet. Advance trading is available. |
| Live              | Trading is active                                               |
| Settling / Closed | New orders are blocked while settlement is processing           |
| Ended             | Market fully settled                                            |

Orders can only be placed when the market status is Upcoming or Live.

***

### Order Types

Predictions currently supports:

* Market Orders
* Limit Orders

Market orders are executed as IOC (Immediate-Or-Cancel) limit orders with slippage protection.

This means:

* Orders may partially fill if liquidity is insufficient
* Any unfilled portion is automatically canceled
* Market orders will never remain resting on the order book

***

### Shared Liquidity Model&#x20;

Markets with two outcomes (such as Up and Down markets) share liquidity through an order book mirroring system.

The Down order book is derived from the Up book using:

Down Price = 1 − Up Price

This means users are effectively viewing two sides of the same liquidity pool.

Switching between Up and Down changes the displayed view, but liquidity remains shared internally.

***

### Charts

Predictions support three chart views.

| Chart Type        | Description                                                    |
| ----------------- | -------------------------------------------------------------- |
| Probability Chart | Implied probability movement based on share trades             |
| Price Chart       | Underlying index price as a line, with the target price marked |
| Candle Chart      | Underlying index price in candlestick format                   |

Charts stop updating once the market reaches the Ended state.

***

### Fees

Fees may apply during:

* Opening trades
* Closing trades
* Settlement (Settlement fee is 0.05%, only on winning shares. )

<br>

Zero fee for both taker and maker at launch Settlement fee is 0.05%, only on winning shares.&#x20;

***

### Prediction Holdings & History

#### Prediction Holdings

Users can view their prediction holdings under:

Orders → Predictions

Predictions holdings remain visible until positions are closed or the market settles.

***

#### Realized PnL & Fees

Users can view realized PnL and fee history under:

Transaction History → Prediction

The page includes:

* Realized PnL (from closing or settlement)
* Trading fees
* Settlement fees

All amounts are displayed in USDT.

***

### Frequently Asked Questions

#### 1. What is Aster Predictions?

Predictions is Aster's prediction market product. You trade shares representing possible outcomes of future events. Each share is priced between $0.01 and $0.99, reflecting the market's view of the probability. When the event resolves, winning shares pay $1 and losing shares pay $0.

Each event contains multiple independent markets, each with its own time window and settlement.

#### 2. How is Up vs Down decided?

Settlement compares the opening target price with the settlement-time index price.

* If settlement price ≥ target price → Up wins
* If settlement price < target price → Down wins

#### 3. What price is used for settlement?

Settlement uses the underlying spot index price.

The tradedshare price is only used for trading and implied probability.

#### 4. What does the prediction share price mean?

The share price represents the market-implied probability of an outcome occurring.

Example:

* Price = 0.54
* Implied probability ≈ 54%

#### 5. When can I place orders?

Orders can only be placed while the market status is:

* Upcoming
* Live

Orders are blocked once the market enters Settling or Ended status.

#### 6. Why can't I sell?

Selling requires an existing position. Users cannot sell prediction shares they do not hold.

#### 7. Why was my market order only partially filled?

Market orders use IOC execution with slippage protection.

If sufficient liquidity is unavailable within the allowed price range, only part of the order may execute while the remaining quantity is canceled.

#### 8. Why does the order book change when switching between Up and Down?

Up and Down share liquidity through order book mirroring. The displayed prices are transformed using:

Down Price = 1 − Up Price

This creates two views of the same liquidity pool.

#### 9. What do the three chart views mean?

* Probability Chart: implied probability movement
* Price Chart: underlying index price and target price
* Candle Chart: candlestick data of the underlying index

#### 10. Where can I view my prediction positions?

Predictions holdings are shown under Orders → Predictions. They appear separately from perpetual futures positions.

#### 11. Where can I view realized PnL and fees?

Go to: Transaction History → Prediction

This page displays realized PnL, trading fees, and settlement fees in USDT.

#### 12. Why did I receive less USDT than expected after selling?

Trading fees are deducted from the gross proceeds. The final credited amount equals to trade value minus trading fees.

13\. Do losing positions pay settlement fees?

No. Settlement fees are deducted only from winning share payouts.

#### 14. Why did the market disappear?

Possible reasons include:

* The market has already ended
* The market was delisted by the platform
* The selected time-window session expired

Users can still review settled markets through history pages.

#### 15. Why does the displayed market time differ from my local time?

Market windows may display using ET or UTC depending on the interface. API timestamps use UTC.

#### 16. Why does the chart look frozen?

Charts only update for Live markets. Once a market has ended, the chart is static. To see live data, switch to the current market window.

#### 17. How do I report a settlement dispute?

Please provide:

* Event or market name
* Settlement time
* Relevant order IDs or trade IDs
* Expected vs actual settlement result

Open a ticket in our official Discord channel, and our support team can then escalate the case for settlement verification.


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