Amazon announced SP-API would move from free to paid. $1,400/year annual fee for third-party developers (activated 2026-01-31), with per-call fees of $0.40 per 1K GET calls above tier allowance scheduled to begin 2026-04-30. Tiered allowances: Basic (2.5M GET calls/month), Pro ($1K/mo, 25M calls), Plus ($10K/mo, 250M calls), Enterprise (custom). Sellers/vendors using SP-API for their own business remain exempt.