Crossmint Wallets Quickstart

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Introduction

Create and interact with Crossmint wallets in EVM. This quickstart uses Crossmint Auth and uses your external wallet (e.g Phantom, Metamask, Coinbase, etc.) as a signer for that wallet.

Learn how to:

• Create a wallet
• View its balance for ETH and ERC20 tokens
• Send a transaction
• Add delegated signers to allow third parties to sign transactions on behalf of your wallet

Deploy

Easily deploy the template to Vercel with the button below. You will need to set the required environment variables in the Vercel dashboard.

Setup

1. Clone the repository and navigate to the project folder:

git clone https://github.com/crossmint/evm-wallets-quickstart.git && cd evm-wallets-quickstart

2. Install all dependencies:

npm install
# or
yarn install
# or
pnpm install
# or
bun install

3. Set up the environment variables:

cp .env.template .env

4. Get a Crossmint client API key from here and add it to the .env file. Make sure your API key has the following scopes: users.create, users.read, wallets.read, wallets.create, wallets:transactions.create, wallets:transactions.sign, wallets:balance.read, wallets.fund.

NEXT_PUBLIC_CROSSMINT_API_KEY=your_api_key

5. Set the chain you want to use. (default is optimism-sepolia)

NEXT_PUBLIC_CHAIN=your_chain

5. Run the development server:

npm run dev
# or
yarn dev
# or
pnpm dev
# or
bun dev

Using in production

1. Create a production API key.