Lithuania
Operating individuali veikla, taxed on profit-share as self-employment income. Headline PIT is 15% but a tapering credit lowers the effective rate to ~5-15%, with Sodra social and health on top.
Income from individual activity (individuali veikla) - self-employment business income, not capital gains.
Effective ~5-15% via a tax credit for income up to EUR 35,000-42,500, rising toward 15% above (standard PIT 15%).
Sodra: social insurance ~12.5-15.5% and health ~6.98%, generally on 90% of taxable profit, with floors/ceilings.
Register individual activity (certificate); deduct actual expenses or use a 30% deemed-expense option; annual PIT return.
USDC is taxable individual-activity income in EUR at receipt; later crypto disposals can be a separate taxable event.