arbitraging.net
Arbitrage is conceptually simple enough to teach and technically difficult enough that people pay to learn it properly. That combination makes education the most durable business under this name.
The trade itself is the oldest in finance: buy in one place, sell in another, keep the difference. The gerund form turns it into an activity, which is how the people doing it talk about it.
Crypto revived the concept for a general audience, cross-exchange and cross-venue arbitrage remain real strategies, and retail interest in the idea has never fully faded.
Beyond education it suits a data or signals product, a research publication, a community, or a fund.
One word, eleven letters, no hyphen, standard spelling. The .net reads correctly for a platform or data service where users arrive deliberately.
The name is listed. Enquiries welcome.