Israel
A regular contractor profit-share is most likely taxed as a business at marginal rates (up to ~47-50%) plus National Insurance, not at the lower capital-gains rate. VAT and bookkeeping obligations typically apply. The business-vs-capital line is fact-specific.
Business / self-employment income - a professional, full-time prop trader paid a profit-share as a contractor is generally treated as carrying on a trade (osek), not a passive investor.
Marginal individual rates up to 47%, plus 3% surtax above ~ILS 721k = effective top ~50%.
Bituach Leumi + health contributions for the self-employed, roughly 6.9% up to ~60% of average wage and ~15.8% above, on net business income.
Register as an osek (patur if turnover under ~ILS 120k, otherwise murshe), file annual return, pay advances; VAT (18%) registration likely if treated as a business.
Crypto incl. USDC is an asset, not currency; receiving and converting payouts is taxable. For a professional trader it is ordinary business income at marginal rates rather than 25-33% capital gains.