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Getting Started

Environment Variables

Copy our template environment file and fill in missing variables.

cp template.env .env

NEXT_PUBLIC_ONCHAINKIT_CDP_KEY=""
BASE_SEPOLIA_PAYMASTER_URL=""
SUBSCRIPTION_PRIVATE_KEY=""
NEXT_PUBLIC_SUBSCRIPTION_SPENDER=""

First, go to portal.cdp.coinbase.com and sign up for an account.

• NEXT_PUBLIC_ONCHAINKIT_CDP_KEY: Go to "Onchain Tools" > "OnchainKit" and copy "Client API Key"
• BASE_SEPOLIA_PAYMASTER_URL: Go to "Onchain Tools" > "Paymaster" > "Configuration" and change the network dropdown on the far right to "Base Testnet (Sepolia)" and copy "Paymaster & Bundler endpoint"

Next, you need to generate a new private key. Foundry's cast wallet new is recommended and you can install Foundry here.

• SUBSCRIPTION_PRIVATE_KEY: set the output private key from cast wallet new
• NEXT_PUBLIC_SUBSCRIPTION_SPENDER: set the output address from cast wallet new (note we will actually change this later)

Install and run

npm install
npm run dev