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Aurum is free to integrate and use. Two third-party services it depends on (Coinbase CDP and Reown) have their own pricing — both offer a free tier that’s enough for most apps.

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Email Wallet (Coinbase CDP)

The email wallet is powered by Coinbase Embedded Wallets, which offers a free tier and charges only if your usage goes beyond those limits. Billing is tied to your project ID, which is managed in your Coinbase Developer Portal. See here for Embedded Wallets Pricing details.
Email wallet can be disabled, in which case there is no cost. See Configuration Options for more on disabling wallets.

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WalletConnect (Reown)

wallets.walletConnect.projectId is required to use WalletConnect — without it, the WalletConnect option won’t work. Project IDs are managed in the Reown Dashboard, which has a free tier with monthly active wallet limits and paid plans for higher volume. See here for Reown pricing details.
WalletConnect can be excluded from the connection options if you don’t need it. See Configuration Options.