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Gamma exposure (options) from BTC options on Deribit, OKX and Bybit, one snapshot per minute. GEX = gamma × open interest × price² × 1 %, in USD. The sign is an ASSUMPTION: dealers long calls / short puts — actual dealer positioning is not known. 0DTE = expiry within 24 h (cyan +, magenta −), carry = later expiries (amber +, violet −). Flip = where total GEX changes sign; CW/PW = the strike with the largest call/put gamma. Descriptive, not a measured signal and not financial advice. "sign model: flow" = the Deribit dealer position from trade flow (taker = customer, maker = dealer; clipped to open interest); OKX/Bybit stay on the assumption. Faint columns before the dashed marker are reconstructed (today's OI, DVOL-scaled IV), not measured.