Buff163 review — Largest CS2 marketplace by volume — Chinese, but trade-friendly.

Buff163 (operated by NetEase in China) is the highest-volume CS2 marketplace by far. Buff prices set the global market floor for many items. Their public-facing site is in Chinese; English UI requires a translator extension. Trades are Steam-mediated so non-Chinese users can buy and sell with the right setup. No public API — third-party tools (including Pricempire) aggregate Buff prices via partnerships or scraping.