This has existed in China for a long time. Shortly after the introduction of stock index futures, some brokers and institutions did so.

At that time, there was no Shanghai and Shenzhen 300ETF fund corresponding to stock index futures, so the combination of SSE 180ETF fund and SZSE 100ETF fund was used. It's easier to have Shanghai and Shenzhen 300ETF funds now.

In fact, this trading method is to use the spot and futures of ETF funds, ETF index and ETF stock spread to carry out multi-directional risk-free arbitrage (in fact, it is low-risk and cannot be completely risk-free. )。

The whole operation process is completely completed by pre-set procedures, and there is basically no human intervention in the transaction process. Because the timing of capturing trading arbitrage is in seconds, and it requires a lot of calculation, which is impossible for manual work.

There have been specialized institutions in China to study this profit mode and develop specialized software. It seems that all the software in the brokerage office is outsourced from them. There are already several sets of software systems in use in China, and the price is beyond personal affordability. However, if brokers buy such software, they will generally let their big customers use it for free. At that time, they advertised that the annual risk-free profit was about 20%.