{"currency":"SOL","spot":117.61,"method":"SVI (Gatheral 2004)","scipy_available":true,"exchanges":{"deribit":{"count":0,"source":"computed"},"okx":{"count":0,"source":"native"},"bybit":{"count":366,"source":"native"},"bullish":{"count":0,"source":"native"}},"summary":{"nearest_expiry":"2026-10-03","nearest_dte":1.4,"rho":-0.201611,"fit_quality":"good","n_surfaces":6},"surfaces":[{"expiry":"2026-10-03","dte":1.4,"svi_params":{"a":0.001,"b":0.011819,"rho":-0.201611,"m":-0.004052,"sigma":0.038503,"rmse":0.000428,"mean_iv_error":6.85,"n_points":21,"fit_quality":"good"}},{"expiry":"2026-10-04","dte":2.4,"svi_params":{"a":0.001004,"b":0.018878,"rho":-0.200112,"m":-0.012248,"sigma":0.045838,"rmse":0.000138,"mean_iv_error":1.06,"n_points":19,"fit_quality":"good"}},{"expiry":"2026-10-09","dte":7.4,"svi_params":{"a":0.001,"b":0.038238,"rho":-0.191504,"m":-0.043418,"sigma":0.102865,"rmse":0.000267,"mean_iv_error":0.87,"n_points":33,"fit_quality":"good"}},{"expiry":"2026-10-16","dte":14.4,"svi_params":{"a":0.001,"b":0.064538,"rho":-0.164706,"m":-0.036911,"sigma":0.155026,"rmse":0.000304,"mean_iv_error":0.48,"n_points":23,"fit_quality":"good"}},{"expiry":"2026-10-23","dte":21.4,"svi_params":{"a":0.013463,"b":0.033651,"rho":-0.19991,"m":-0.008745,"sigma":0.072332,"rmse":0.000405,"mean_iv_error":0.5,"n_points":20,"fit_quality":"good"}},{"expiry":"2026-10-30","dte":28.4,"svi_params":{"a":0.001,"b":0.077556,"rho":-0.237693,"m":-0.076772,"sigma":0.273797,"rmse":0.00048,"mean_iv_error":0.42,"n_points":30,"fit_quality":"good"}}],"timestamp":"2026-10-01T21:49:23.338175+00:00","preview":true,"signed":true,"note":"Preview shows SVI params only. Paid endpoint includes smooth interpolated smile per expiry.","canonical":"v1|SVI-PREVIEW|SOL|2026-10-01T21:49:23.338175+00:00","signature":"87354740d5f39bbfa45063232961fe4e815af0fe725b8deb820e3ab7b426b34faa08d6926b144bb8c38a38e013cd724538b6b0f807ce2edd7e4799630098de00","digest":"b86408c7e5beb42142bac195f2c5c9bf3ade285a95d5feb9bbbd01ab5c26e98d","pubkey":"7ab07fbe7d08cd16823e5eb0db0e21f3f38e9366d5fd00d14e95df0fb9b51a1a","preview_cached":true,"cache_age_minutes":43}