Biggest US stock gainers and losers (market cap over $2B), unusual volume and top crypto movers. Each mover: price, % change, relative volume, pre/post-market change, sector, and up to three news headlines that mention it, so the move and its likely reason come in one call. Rebuilt every 15 minutes. $0.02 per call, no account. Free 24h-delayed sample: GET https://ioswarm.io/api/v1/feeds/movers/sample.

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