The strongest evidence found is the World Gold Council page titled "Gold Market Primer: Market size and structure - World Gold Council," whose search snippet closely matches the claim: approximately US$361bn per day in 2025, with OTC and exchange trading both contributing significantly and roughly evenly. A second World Gold Council page, "Gold's key attributes - Liquidity - World Gold Council," appears to provide a concrete exchange-volume figure of about US$174bn/day in 2025, which is broadly consistent with a near-even split within a total around US$361bn/day. However, I could not successfully fetch either page or the cited X post, so the claim cannot be treated as fully validated from page contents in this run.