# \[Plasma]

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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://plasmascan.to/address/0xC507d503E5076b725Ae2069Ef62BAf5713bD7eF1/contract/9745/code"><code>0xC507d503E5076b725Ae2069Ef62BAf5713bD7eF1</code></a></td><td><a href="https://plasmascan.to/address/0x1472a38cd3350f9867024e3174CEb96BFbc02B07/contract/9745/code"><code>0x1472a38cd3350f9867024e3174CEb96BFbc02B07</code></a></td></tr><tr><td>EventEmitter</td><td><a href="https://plasmascan.to/address/0x7c1b4dE41EC16E3D054A1b226e91c1232201B577/contract/9745/code"><code>0x7c1b4dE41EC16E3D054A1b226e91c1232201B577</code></a></td><td><a href="https://plasmascan.to/address/0x969984b31d3a7e81f9a33364B8b45B01EE0f2d53/contract/9745/code"><code>0x969984b31d3a7e81f9a33364B8b45B01EE0f2d53</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 | [`0x73ee6e0A7CD040301104bEDcFDccD95F1074883D`](https://plasmascan.to/address/0x73ee6e0A7CD040301104bEDcFDccD95F1074883D/contract/9745/code) |
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