This repository contains all smart contract implementations and off-chain services of MELD Lending and Borrowing protocol on the Cardano blockchain.
The project include these following components:
We implement the Cardano smart contracts in Plutarch and build transactions with our cardano-tx-builder library.
The Lending DB service in PostgreSQL is at the heart of all off-chain components.
The Lending Indexer sync protocol data from the Cardano blockchain to Lending DB. Then other components can read serve data from the DB.
The Lending Indexer sync the protocol data from the Cardano blockchain to Lending DB.
It is implemented using our in-house cardano-index framework. The connection constantly
streams events to our indexer whenever the node receives new blocks or detects a rollback. All data is persisted to a PostgreSQL DB in Lending DB.
The Lending API service serves data from the Lending DB for building transactions and UI rendering.
For now, the building transaction process is executed by the Lending API. We are also planning to move this process to front-end.
The Lending Oracle Service provides the tokens' price on the blockchain that is needed for Lending and Borrowing smart contract execution.
It fetches the tokens' price from CoinMarketCap then builds and submits transactions to update the Oracle UTXO to the Cardano Blockchain.
The Lending Oracle Service is a temporary solution and third-party Oracle services will be integrated in the future.
Our protocol uses the Concurrent & Deterministic Batching solution to avoid network congestion.
The Lending Batcher Service runs periodically to apply all users' requests to Pool.
The Lending Faucet API is a web-based service that provides test tokens for users on Preview and Preprod. It enables users to experiment with Lending and Borrowing testnet features, without having to spend real token on the mainnet.
The Main use cases document describes how user interact with the Lending and Borrowing protocol.
The detailed smart contracts design and transaction diagrams is available here.
The instruction to set up and run the project can be found here.
Distributed under the MIT License. See LICENSE.md for more information.
To get support, please join the MELD discord channel.