curl -H "X-API-Key: gld_your_key" \
  "https://api.gildea.ai/v1/themes?axis=value_chain"

{
  "data": [
    {
      "axis": "value_chain",
      "label": "Foundation Models",
      "signal_count": 245,
      "trend": {
        "share_of_voice": 0.22,
        "theil_sen_slope": 0.12,
        "streak": 3,
        "coefficient_of_variation": 0.45,
        "current_week": 28,
        "prior_week": 24,
        "chi2_trend": 15.3,
        "chi2_p_value": 0.0001,
        "effect_size": 0.25
      },
      "direction": "Rising",
      "confidence": "Significant",
      "stability": "Steady",
      "notability": "High",
      "notability_reasoning": "Theme with confirmed upward trend and consistent coverage; notable upward shift reliably gaining traction."
    },
    {
      "axis": "value_chain",
      "label": "Infrastructure",
      "signal_count": 198,
      "trend": {
        "share_of_voice": 0.18,
        "theil_sen_slope": 0.08,
        "streak": 2,
        "coefficient_of_variation": 0.38,
        "current_week": 22,
        "prior_week": 20,
        "chi2_trend": 8.2,
        "chi2_p_value": 0.004,
        "effect_size": 0.20
      },
      "direction": "Rising",
      "confidence": "Significant",
      "stability": "Steady",
      "notability": "High",
      "notability_reasoning": "Theme with confirmed upward trend and consistent coverage; notable upward shift reliably gaining traction."
    }
  ]
}