Recently studying the stablecoin ecosystem, I found that this field is actually much more complex than many people think.

Starting with the basics, stablecoins are cryptocurrencies with relatively stable prices, completely different from the rollercoaster fluctuations of BTC and ETH. Their existence actually solves a major pain point in the early crypto market—merchants are reluctant to accept, and investors are hesitant to hold long-term, because an asset worth $10k today might only be worth $5,000 tomorrow. After Tether launched USDT in 2014, the market finally had a reliable price anchor.

Stablecoins have now become a fundamental infrastructure of the crypto ecosystem, mainly used for three purposes: payments, hedging, and providing liquidity. Almost all DeFi protocols rely on them—you need to lend, mine, or trade, and stablecoins are essential. Cross-border payments are also a major advantage; compared to traditional remittances with high costs and slow speeds, transferring stablecoins is much faster and cheaper.

According to their operational principles, stablecoins can be roughly divided into four categories. Fiat-backed stablecoins (like USDT, USDC) are issued 1:1 with collateral in dollars, euros, etc. Crypto-backed stablecoins (like DAI, MIM) are collateralized with cryptocurrencies such as BTC and ETH, requiring over-collateralization to ensure stability. Commodity stablecoins are backed by gold or other precious metals. Lastly, algorithmic stablecoins rely entirely on algorithms to regulate supply; these carry the highest risk, with the collapse of UST in 2022 serving as a typical cautionary example.

The total market size of stablecoins is now quite substantial, and governments worldwide are accelerating the development of regulatory frameworks. Major economies like the US, EU, Hong Kong, Japan, and Singapore have introduced or revised relevant regulations, meaning that future compliance will be key to whether stablecoin projects can survive.

Interestingly, although the global stablecoin market currently heavily depends on the US dollar, this pattern is changing. More countries are launching their own national stablecoins—Hong Kong is promoting mBridge cross-border CBDC, Japan is developing a JPY stablecoin, and South American countries are exploring their own digital currency schemes. The future is likely to feature a multi-currency, multi-region coexistence.

In terms of applications, stablecoins are no longer just trading tools; they are expanding into RWA (real-world asset tokenization), cross-border payments, DeFi, and more. In emerging markets with high inflation or weak financial infrastructure, stablecoins could even become a more reliable store of value than the local currency.

Of course, stablecoins also carry risks. Transparency of reserves has always been an issue; USDT’s reserves have long been questioned. Centralization risk is also evident—BUSD was halted due to regulatory pressure. Crypto-backed stablecoins face liquidation risks; if collateral prices plummet, smart contracts will automatically liquidate. Moreover, most stablecoins are pegged to the US dollar, which exposes non-USD regions to exchange rate and geopolitical risks.

Regarding investment strategies, stablecoins are not very suitable for long-term investing because their prices fluctuate very little, and holding them for a long time can be a waste of capital. Short-term trading opportunities exist, such as arbitrage between USDT and USDC—though the margins are small, sufficient capital can still generate profits. A more practical approach is earning yields through collateralization or liquidity provision, especially when new stablecoins are launched, as project teams often offer high yields to attract users.

Overall, stablecoins have evolved from peripheral tools to core infrastructure of the crypto ecosystem. With improved regulation, diversified applications, and technological advances, there is still much room for growth in this field. For investors wanting to participate in crypto markets while reducing risk, understanding how stablecoins work and their associated risks is an essential lesson.