If you want to earn $3,000 a month in cryptocurrency without trading, here are some legal and straightforward options:

1. **Investing**: Put your money into well-established cryptocurrencies like Bitcoin or Ethereum. Look for projects with strong fundamentals and growth potential. Be prepared to hold your investments for a while to see significant returns.

2. **Staking**: This involves holding a cryptocurrency in a wallet to support its network. In exchange, you earn more tokens. Many projects offer staking rewards.

3. **Mining**: If you have the right equipment, you can mine cryptocurrencies by solving complex problems to validate transactions. Keep in mind that mining can be expensive and resource-heavy.

4. **DeFi (Decentralized Finance)**: You can earn passive income by lending your crypto or providing liquidity to decentralized exchanges. This can generate interest or fees.

5. **Freelancing**: Offer your skills in the crypto space. There’s a growing need for content creators, marketers, developers, and consultants who specialize in cryptocurrencies and blockchain.

Earning $3,000 a month in crypto requires some research and effort. Stay informed, explore different options, and manage your risks wisely. Good luck!