For order only. Represents a currency and its amount on a certain side (`from` or `to`). Used with `OrderCreateV1Req`; Don't be used with `to` of the preview interface (preview `to` uses `PreviewToParam.ratio`).
| Name | Type | Description | Notes |
|---|---|---|---|
| Asset | string | Currency symbol, consistent with `GET /asset-swap/asset/list` and business support scope. | |
| Amount | string | The quantity of this currency on this side, decimal string (non-scientific notation). `from` represents the selling quantity, and `to` represents the target side quantity. Different from preview interface `to[].ratio`. |