> ## Documentation Index
> Fetch the complete documentation index at: https://docs.contabull.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Add wallet to address book

> 
Add cryptocurrency wallets to your address book. **Required before trading** - only address book wallets can be used as destinations.

#### Address Book Concept

The address book serves as a security and management layer:

- **Required for Trading**: Only address book wallets can be used in [Execute crypto purchase](/api-reference/crypto/execute-crypto-purchase)
- **Security Monitoring**: Added wallets are integrated into our monitoring system
- **Address Validation**: Addresses are validated against the specified network
- **Audit Trail**: All transactions to address book wallets are fully tracked

#### Prerequisites

- Use [List available crypto products](/api-reference/crypto/list-available-crypto-products) to see supported networks for each crypto
- Ensure wallet network matches the crypto you want to receive

#### Usage Flow

1. [List available crypto products](/api-reference/crypto/list-available-crypto-products) - Check supported networks
2. **Add wallet** using this endpoint with matching network
3. [List address book wallets](/api-reference/crypto/list-address-book-wallets) - Verify wallet was added successfully
4. [Execute crypto purchase](/api-reference/crypto/execute-crypto-purchase) - Use wallet ID for crypto purchases