Standard $74.99/mo · $749.99/yr ($62.50/mo billed annually)
Pricing is shown on the homepage (quantdata.us/#pricing): $74.99/mo billed monthly, or $62.50/mo billed annually. The separate pricing page needs a login; the $749.99 yearly total is from the vendor's own llms.txt.
A Professional plan for registered professional traders exists; its price is not shown publicly. The API and Quant Data Futures are sold separately and not shown.
Free Free
Plus $24.95/mo · ≈$215.40/yr (billed annually; 12 × $17.95/mo, derived)
Pro $54.95/mo · ≈$455.40/yr (billed annually; 12 × $37.95/mo, derived)