# Contracts ![](https://img.shields.io/badge/Ethereum-3C3C3D?style=flat-square&logo=Ethereum&logoColor=618bf3) ![](https://img.shields.io/badge/Solidity-^0.6.0-e6e6e6?style=flat-square&logo=solidity&logoColor=black?labelColor=e6e6e6)

**Overview** > Desmo is a Smart contract that implements the IExec `IexecDoracle`. Its purpose is to serve as the main API entrypoint for DESMO-LD client Smart Contracts. Additionally, Desmo will implement the logic to randomly select a set of valid Thing Description Directories registered in the DESMOHub. The APIs will serve on-chain clients with endpoints that can search for a device inside the DESMO-LD network of Thing Description Directories, get sensor data and invoke operations on remote sensors. ## Getting started The best way of using Desmo-LD is to use our handcrafted [SDK](https://github.com/vaimee/desmo-sdk), there you can have access to all the methods and features of our Distrubuted IoT oracles without a sweat. However, if you want to dive deep into the innerworking of our system you can start from here, and learn how to interact directly with our smart contracts. ### Deployement Currently, a single instance of Desmo and DesmoHub is deployed on the viviani network. In the table you can find the contract addresses. | Contract | Address | |---|---| | DesmoHub | [0x1E57770C58249cc55Ec9737F40c2F59e757F96ec](https://blockscout-viviani.iex.ec/address/0x1E57770C58249cc55Ec9737F40c2F59e757F96ec/transactions) | | Desmo | [0xc27c0b680F80EC1bB703C0227d2648aD6cA466E6](https://blockscout-viviani.iex.ec/address/0xc27c0b680F80EC1bB703C0227d2648aD6cA466E6/transactions) |