# \[Avalanche]

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The **Listing Contract** is a smart contract that implements a simplified first-come first-serve repoToken orderbook.

<table><thead><tr><th width="228.66666666666666">Listing Contract</th><th>Implementation Address</th><th>Proxy Address</th></tr></thead><tbody><tr><td>RepoTokenLinkedList</td><td><a href="https://snowtrace.io/address/0xeF1471F4193b52dA071660385CBbCEA58f006E88/contract/43114/code"><code>0xeF1471F4193b52dA071660385CBbCEA58f006E88</code></a></td><td><a href="https://snowtrace.io/address/0xC67a8C211b5F2774728D946FFc85F0B48dC50A6c/contract/43114/code"><code>0xC67a8C211b5F2774728D946FFc85F0B48dC50A6c</code></a></td></tr><tr><td>EventEmitter</td><td><a href="https://snowtrace.io/address/0x9bA66BbCF094C57Ef44905F743758F7699e00E69/contract/43114/code"><code>0x9bA66BbCF094C57Ef44905F743758F7699e00E69</code></a></td><td><a href="https://snowtrace.io/address/0xf549336c70cf2481e4d9a41827992a369e7b7cce/contract/43114/code"><code>0xf549336c70cf2481e4d9a41827992a369e7b7cce</code></a></td></tr></tbody></table>

The **Helper Contracts** are modular contracts that the listing contract relies on to operate

| Helper Contracts    | Implementation Address                                                                                                                      |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
| DiscountRateAdapter | [`0xe44445B8F43C351ea6DD9b038eEd2Bf5C93D0E19`](https://snowtrace.io/address/0xe44445B8F43C351ea6DD9b038eEd2Bf5C93D0E19/contract/43114/code) |
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