Yes, you can get USDT for free in the following 5 ways: 1. Participate in airdrop tasks on mainstream exchanges, such as registering and giving away, completing novice tasks, and inviting friends to get rewards; 2. Join the blockchain project community and obtain airdrops through Web3 social platform or Twitter/Discord interaction; 3. Participate in the "test network" activity, register the test chain address and simulate the use of DApp to get incentives; 4. Complete tasks on the cryptocurrency navigation platform to receive novice gift packages, participate in sign-in, lottery and other activities; 5. Interact with the content creation and community, and publish original content to obtain USDT rewards from the project party. At the same time, you need to pay attention to security risks, do not fill in private keys, do not believe in scams, and choose mainstream platforms to participate.

Whether an Ethereum perpetual contract is easy to do depends on multiple factors. 1. Its characteristics include no maturity date, capital fee mechanism and high leverage; 2. The advantages are high liquidity, moderate volatility, and support for a variety of strategies; 3. Challenges include high leverage and easy liquidation, capital fee rates affect returns, exchange risks and market manipulation risks; 4. Suitable for short-term traders, arbitragers and hedgeers, not suitable for inexperienced novices or people who cannot withstand high volatility; 5. To improve the success rate, you need to control leverage, set stop loss, pay attention to market sentiment and choose a reliable exchange. Overall, Ethereum perpetual contracts are suitable for experienced traders, but they need to be operated with caution.

The altcoin transfer fee varies from chain to chain and is mainly determined by the basic network fee, transaction speed and Gas unit. 1. The Ethereum fee is high, with an average of US$2~20 per transaction, suitable for high-value transactions; 2. The Binance Smart Chain fee is low, about US$0.1~0.3, suitable for daily operations; 3. The Solana fee is extremely low, usually below US$0.0001, suitable for high-frequency transactions; 4. The Polygon fee is less than US$0.01, compatible with EVM; 5. TRON focuses on low-cost, and the handling fee is almost negligible. Users should reasonably choose the transfer method based on the characteristics of the chain, network congestion and gas fluctuations, and at the same time confirm that the token belongs to the same link as the receiver to avoid asset losses.

The ways to obtain USDT include: 1. Purchase through centralized exchanges such as Binance, OKX, etc., which is convenient to operate and supports multiple payment methods; 2. OTC modules are included in the platform for over-the-counter transactions, suitable for large-scale and privacy-conscious users; 3. Use stablecoin exchange platforms or wallets (such as TokenPocket) and decentralized exchanges (such as Uniswap) to achieve cross-chain or cross-currency exchanges; 4. Participate in exchange activities or task platforms to obtain airdrop rewards; 5. Obtain USDT incentives through mining, content creation, community interaction, etc.; 6. Collect USDT directly from other people's wallets, and pay attention to chain type matching to avoid asset loss.

USDT is not a scam, but there are risks. 1. Tether provides liquidity in the crypto market by issuing USDT, a stablecoin anchored by the US dollar; 2. The company's background is related to Bitfinex, and has been fined for audit issues but has increased transparency; 3. The reserve assets are mainly US Treasury bonds rather than pure cash, and there are certain financial risks; 4. Face risks such as insufficient audit frequency, centralized control and compliance restrictions; 5. The USDT market is highly accepted, but trust needs to be based on continuous disclosure and compliance operations. Overall, USDT is trustworthy but does not equal zero risk, and users should be cautious.

Ethereum transaction fees are determined by Gas consumption and Gas price, which are specifically affected by network congestion, transaction complexity and Gas Limit; EIP-1559 introduces a basic fee and priority fee mechanism, and users can set the highest fee and tip; the current handling fee is as low as 0.0001 ETH, up to 0.1 ETH; saving methods include selecting low peak periods, using the Layer 2 network and adjusting Gas price.

The role of Ethereum smart contract is to realize decentralized, automated and transparent protocol execution. Its core functions include: 1. As the core logic layer of DApp, it supports token issuance, DeFi, NFT and other functions; 2. Automatically execute contracts through code to reduce the risks of human intervention and fraud; 3. Build a DeFi ecosystem so that users can directly conduct financial operations such as lending and transactions; 4. Create and manage digital assets to ensure uniqueness and verifiability; 5. Improve the transparency and security of supply chain and identity verification; 6. Support DAO governance and realize decentralized decision-making.

The value of stablecoins is usually pegged to the US dollar 1:1, but it will fluctuate slightly due to factors such as market supply and demand, investor confidence and reserve assets. For example, USDT fell to $0.87 in 2018, and USDC fell to around $0.87 in 2023 due to the Silicon Valley banking crisis. The anchoring mechanism of stablecoins mainly includes: 1. fiat currency reserve type (such as USDT, USDC), which relies on the issuer's reserves; 2. cryptocurrency mortgage type (such as DAI), which maintains stability by over-collateralizing other cryptocurrencies; 3. Algorithmic stablecoins (such as UST), which relies on algorithms to adjust supply, but have higher risks. Common trading platforms recommendations include: 1. Binance, providing rich trading products and strong liquidity; 2. OKX,