diff --git a/app/api/routes.py b/app/api/routes.py
index 530748a..4ebbd0c 100644
--- a/app/api/routes.py
+++ b/app/api/routes.py
@@ -213,6 +213,15 @@ class SnapReport(BaseModel):
     last_bar_t: int | None = None
     tf: str | None = None
     chart_w: float | None = None
+    chart_h: float | None = None
+    cursor_y: float | None = None
+    # Where the indicator actually landed versus where the price says it should
+    # — the only way to tell a wrong answer from a correctly-computed one drawn
+    # in the wrong place.
+    dot_y: float | None = None
+    expected_y: float | None = None
+    bar_low_y: float | None = None
+    bar_high_y: float | None = None
     note: str | None = None
 
 
diff --git a/static/chart.js b/static/chart.js
index 7a5fe13..888facf 100644
--- a/static/chart.js
+++ b/static/chart.js
@@ -642,6 +642,23 @@ class ConfluenceChart {
             bars_held: this.bars.length,
             first_bar_t: this.bars[0].t, last_bar_t: this.bars[this.bars.length - 1].t,
             chart_w: this.chartEl.clientWidth,
+            chart_h: this.chartEl.clientHeight,
+            cursor_y: Math.round(point.y),
+            dot_y: this.snapDot && !this.snapDot.hidden
+              ? Math.round(this.snapDot.getBoundingClientRect().top
+                  - this.chartEl.getBoundingClientRect().top) + 5
+              : null,
+            expected_y: Math.round(y),
+            bar_low_y: (() => {
+              const bar = this.bars.find(candle => candle.t === snapped.t);
+              const at = bar && this.candles.priceToCoordinate(bar.l);
+              return at == null ? null : Math.round(at);
+            })(),
+            bar_high_y: (() => {
+              const bar = this.bars.find(candle => candle.t === snapped.t);
+              const at = bar && this.candles.priceToCoordinate(bar.h);
+              return at == null ? null : Math.round(at);
+            })(),
             note: point.t == null
               ? 'coordinateToTime returned null'
               : `drift ${drift}s (${Math.round(drift / step)} bars), step ${step}s`,