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

# first_trade

> Fires when a wallet makes its first-ever Polymarket trade. Detect new market participants.

## Filters

| Filter           | Type     | Description                             |
| ---------------- | -------- | --------------------------------------- |
| `min_amount_usd` | `number` | Minimum trade size for the first trade. |

## Payload

Same schema as [`trade`](/webhooks/events/trade), with `"type": "first_trade"`.

## Use Cases

* Growth analytics: track new user onboarding rate
* Welcome flows: trigger onboarding automations for new traders
* Smart money detection: flag large first trades (potential whale entry)