---
title: "IOverlayerWrapBacking"
description: "Solidity interface for managing collateral backing of the OverlayerWrap token: the supply and withdraw functions and their parameters."
keywords:
  - "IOverlayerWrapBacking"
  - "Solidity interface"
  - "collateral backing"
canonical_url: https://docs.overlayer.fi/developer_guide/contracts/interfaces/IOverlayerWrapBacking
md_url: https://docs.overlayer.fi/developer_guide/contracts/interfaces/IOverlayerWrapBacking.md
last_updated: 2026-05-05T15:42:56.000Z
---

# IOverlayerWrapBacking

> Solidity interface for managing collateral backing of the OverlayerWrap token: the supply and withdraw functions and their parameters.

Interface for managing collateral backing for the OverlayerWrap token

### supply

```solidity
function supply(uint256 amount, address collateral) external
```

Supply collateral to the backing contract

#### Parameters

| Name | Type | Description |
| ---- | ---- | ----------- |
| amount | uint256 | The amount of collateral to supply |
| collateral | address | The address of the collateral token |

### withdraw

```solidity
function withdraw(uint256 amount, address collateral) external
```

Withdraw collateral from the backing contract

#### Parameters

| Name | Type | Description |
| ---- | ---- | ----------- |
| amount | uint256 | The amount of collateral to withdraw |
| collateral | address | The address of the collateral token to withdraw |