> ## 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

> Get notified when a trade exceeds a configured size threshold.

<Note>
  **Event:** `trader_whale_trade` \
  **Endpoint:** `wss://api.struct.to/ws/alerts` \
  **Cost:** 0.2 credits per event
</Note>

Fires when a trade exceeds the configured USD size threshold. This is the primary event for tracking large trades across Polymarket, commonly used to follow whale activity and detect significant market-moving positions.

## Filters

| Filter                      | Type       | Required | Description                                            |
| --------------------------- | ---------- | -------- | ------------------------------------------------------ |
| `wallet_addresses`          | `string[]` | No       | Restrict to specific trader wallet addresses (max 500) |
| `min_usd_value`             | `number`   | Yes      | Minimum trade size in USD                              |
| `condition_ids`             | `string[]` | No       | Restrict to specific markets (max 500)                 |
| `event_slugs`               | `string[]` | No       | Restrict to specific events (max 500)                  |
| `min_price`                 | `number`   | No       | Minimum probability threshold (0.0 to 1.0)             |
| `max_price`                 | `number`   | No       | Maximum probability threshold (0.0 to 1.0)             |
| `exclude_shortterm_markets` | `boolean`  | No       | Exclude short-term "updown" markets                    |

## Subscribe

```json theme={null}
{
  "op": "subscribe",
  "event": "trader_whale_trade",
  "min_usd_value": 10000,
  "exclude_shortterm_markets": true
}
```

## Response

```json theme={null}
{
  "event": "trader_whale_trade",
  "timestamp": 1775913505260,
  "data": {
    "trader": "0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b",
    "taker": "0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b",
    "position_id": "13579",
    "condition_id": "0x4fec624c0ff2bfae89956cebd6fbc9c58f995f824382dc587dc5a32a4b15940b",
    "outcome": "Yes",
    "outcome_index": 0,
    "question": "Will ETH reach $10k by December 2026?",
    "market_slug": "will-eth-reach-10k-by-december-2026",
    "event_slug": "eth-price-milestones",
    "image_url": "https://polymarket-upload.s3.us-east-2.amazonaws.com/will-eth-reach-10k-by-december-2026.png",
    "trade_id": "jkl012",
    "hash": "0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
    "block": 58321500,
    "confirmed_at": 1713021600,
    "amount_usd": 50000,
    "shares_amount": 71428.57,
    "fee": 100.00,
    "side": "Buy",
    "price": 0.70,
    "probability": 0.70,
    "exchange": "Polymarket",
    "trade_type": "OrderFilled"
  }
}
```

<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>