nkaz001

databento provides high-quality market-by-order data at a reasonable price, so at least I can play with the data, though I'm unsure about actual trading. That's why people including me like crypto.

Thank you! I know that NASDAQ and CME also have designated market makers, but I couldn't find any specific privileges they have over non-market makers, apart from the different fee schedules. Is the ability of NYSE designated market makers to handle order fills a common practice across other exchanges?

Is designated market maker able to get filled before an order in the FIFO order queue at NYSE, NASDAQ or CME?

No, that's why the project focuses more on cryptocurrency, which offers easier access to data and the market. I'm trying to understand trad-fi markets and implementing L3 market-by-order backtesting using Databento data, but creating a live bot without the market access would be impossible.

Sadly, it is becoming more like trad-fi. In the past, anyone could receive rebates for market making, but these days, only high-tier traders, trading companies, can benefit from them. The tier hurdle is getting higher. Also, there are now different APIs and limits for individual traders and high-tier trading companies.

I partly agree with you. Firstly, this is primarily a backtesting tool, allowing you to test under different latency setups. The example in the project demonstrates its use. Secondly, crypto exchanges is slow. Even though they provide low-latency APIs to higher-tiered traders, but I believe they are still slower compared to trad-fi. But, the market data is public, there might be differences in the data received by higher-tiered traders. These enable individuals to analyze the market and start projects like this.