> For the complete documentation index, see [llms.txt](https://lionstudios.gitbook.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lionstudios.gitbook.io/readme/features/ads/how-to-convert-to-lion-ads/bidsmart-v3-to-v4-migration.md).

# Bidsmart V3 to V4 Migration

### Overview

This guide covers the **LionAds v3-to-v4 update changes**. No game code changes are required — the update is entirely in the **remote config JSON** you send.

`LionAdsRemoteConfigHandler.SetRemoteConfig`

### What changed

* Coefficients are now set **separately per ad type**, in `Interstitial` and `Rewarded` blocks, instead of once at the `BidSmart` level.
* `UpCoefBase` / `DownCoefBase` were renamed to `UpCoef` / `DownCoef`, and the implicit `1 +` was removed — each value is now the multiplier it reads as (the old `UpCoefBase: 2.0` is now `UpCoef: 3.0`).
* `FillRateMinimum` and `FailStreakUnderMinimumMax` were **removed** along with the auto-disable mechanism. BidSmart no longer switches itself off, so returning demand is picked up immediately. Use `Enabled: false` as the kill switch.

### Before (V3)

{% code overflow="wrap" lineNumbers="true" %}

```json
{
  "BidSmart": {
    "Enabled": true,
    "UpCoefBase": 2,
    "DownCoefBase": 0.35,
    "FillRateMinimum": 0.3,
    "FailStreakUnderMinimumMax": 10
  }
}
```

{% endcode %}

### After (V4)

{% code overflow="wrap" lineNumbers="true" %}

```json
{
  "BidSmart": {
    "Enabled": true,
    "Interstitial": {
      "UpCoef": 3,
      "DownCoef": 0.83
    },
    "Rewarded": {
      "UpCoef": 3,
      "DownCoef": 0.83
    }
  }
}
```

{% endcode %}

### Field mapping

| Old (V3)                      | New (V4)                                                     | Notes                                             |
| ----------------------------- | ------------------------------------------------------------ | ------------------------------------------------- |
| `Enabled`                     | `Enabled`                                                    | Unchanged. Default `false`.                       |
| `UpCoefBase` (default 2.0)    | `Interstitial.UpCoef` / `Rewarded.UpCoef` (default 3.0)      | Per ad type. The value is now the raw multiplier. |
| `DownCoefBase` (default 0.35) | `Interstitial.DownCoef` / `Rewarded.DownCoef` (default 0.83) | Per ad type.                                      |
| `FillRateMinimum`             | —                                                            | Removed (auto-disable gone).                      |
| `FailStreakUnderMinimumMax`   | —                                                            | Removed (auto-disable gone).                      |


---

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