# Express Relay Solidity SDK

## Install

### Truffle/Hardhat

If you are using Truffle or Hardhat, simply install the NPM package:

```bash
npm install @pythnetwork/express-relay-sdk-solidity
```

### Foundry

If you are using Foundry, you will need to create an NPM project if you don't already have one.
From the root directory of your project, run:

```bash
npm init -y
npm install @pythnetwork/express-relay-sdk-solidity
```

Then add the following line to your `remappings.txt` file:

```text
@pythnetwork/express-relay-sdk-solidity/=node_modules/@pythnetwork/express-relay-sdk-solidity
```