> ## Documentation Index
> Fetch the complete documentation index at: https://docs.struct.to/llms.txt
> Use this file to discover all available pages before exploring further.

# Trader Whale Trade

> Fire a webhook when a tracked trader's trade clears your size and probability thresholds.

<Note>
  **Event:** `trader_whale_trade` \
  **Cost:** 0.2 credits per delivery
</Note>

The `trader_whale_trade` event fires when a trade exceeds the configured size and optional probability thresholds. The full payload schema is in the auto-generated [Trader Whale Trade callback](/api-reference/webhook-callbacks/whale-trade-callback) reference; this page documents the filters and matching behavior.

<Note>
  **`price` and `probability` are not the same field:**

  * **`price`**: the outcome you are looking at (the token in `outcome_index` / `position_id`).
  * **`probability`**: always outcome index `0` (the Yes/Up token), no matter which outcome the payload is about.

  They are equal only when `outcome_index` is `0`. On the No side (index `1`) they are complements: a `price` of `0.40` pairs with a `probability` of `0.60`.
</Note>

## When to use this

* Surface only the large, market-moving trades from a watched set of wallets.
* Gate alerts to high-conviction positions by pairing size with a probability band.
* Cut noise from small fills so your feed carries just the whale-sized activity.

## Subscription filters

Add these to the `filters` object when you create the subscription.

| Filter                      | Type      | Description                                             |
| --------------------------- | --------- | ------------------------------------------------------- |
| `wallet_addresses`          | string\[] | Restrict to specific trader wallet addresses (max 500). |
| `min_usd_value`             | number    | Minimum USD size of the trade.                          |
| `min_price`                 | number    | Minimum outcome probability, `0.0`–`1.0`.               |
| `max_price`                 | number    | Maximum outcome probability, `0.0`–`1.0`.               |
| `condition_ids`             | string\[] | Restrict to specific markets by condition ID (max 500). |
| `event_slugs`               | string\[] | Restrict to specific events by slug (max 500).          |
| `exclude_shortterm_markets` | boolean   | Exclude short-term Up/Down markets.                     |

## Example

```json theme={null}
{
  "url": "https://your-server.com/webhooks",
  "event": "trader_whale_trade",
  "filters": {
    "min_usd_value": 10000,
    "min_price": 0.1,
    "max_price": 0.9
  }
}
```

## Notes

* Set `min_usd_value` to define what counts as a whale-sized trade; without it there is no size floor and every trade matches.
* The probability filters are optional and narrow matches to a specific confidence band.