# Hermés SDKs

Hermés exports a set of SDKs to enable consumers to build decentralized applications on top of the Hermés Contracts. They also allow your DApps to execute write operations to the chain

Most Hermés SDKs target web and platforms like Node.js and ES5 Javascript environments.

The SDKs built by the Mirrorworld team extend already existing contracts shown below:

| Contract Name                      | Description                                                             | Program                                                                                                                       |
| ---------------------------------- | ----------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| **`@mirrorworld/mirage.core`**     | Marketplace SDK                                                         | [Metaplex auction-house](https://github.com/metaplex-foundation/metaplex-program-library/tree/master/auction-house/)          |
| **`@mirrorworld/library.upgrade`** | Level Upgrade SDK for MW Generation 1                                   | [level-upgrade-program](https://github.com/mirrorworld-universe/mirrorworld-program-library/blob/main/programs/level-upgrade) |
| **`@mirrorworld/assets.core`**     | Assets program used to authorize mints for in-game assets               | N/A                                                                                                                           |
| **`@mirrorworld/game.core`**       | Game program used to identify a game instance on the Matrix Core Engine | N/A                                                                                                                           |