diff --git a/web/components/charts/contract/pseudo-numeric.tsx b/web/components/charts/contract/pseudo-numeric.tsx
index 6b9a436a..a53edd9b 100644
--- a/web/components/charts/contract/pseudo-numeric.tsx
+++ b/web/components/charts/contract/pseudo-numeric.tsx
@@ -11,14 +11,23 @@ import { MARGIN_X, MARGIN_Y, getDateRange } from '../helpers'
 import { SingleValueHistoryChart } from '../generic-charts'
 import { useElementWidth } from 'web/hooks/use-element-width'
 
+// mqp: note that we have an idiosyncratic version of 'log scale'
+// contracts. the values are stored "linearly" and can include zero.
+// as a result, we have to do some weird-looking stuff in this code
+
 const getChartData = (
   contract: PseudoNumericContract,
   bets: Bet[],
   start: Date,
   end: Date
 ) => {
-  const { min, max } = contract
-  const getY = (p: number) => p * (max - min) + min
+  const { min, max, isLogScale } = contract
+  const getY = (p: number) =>
+    isLogScale
+      ? 10 ** (p * Math.log10(contract.max - contract.min + 1)) +
+        contract.min -
+        1
+      : p * (max - min) + min
   const sortedBets = sortBy(bets, (b) => b.createdTime)
   const startProb = getInitialProbability(contract)
   const endProb = getProbability(contract)
@@ -46,9 +55,14 @@ export const PseudoNumericContractChart = (props: {
   const containerRef = useRef<HTMLDivElement>(null)
   const width = useElementWidth(containerRef) ?? 0
   const height = props.height ?? (isMobile ? 150 : 250)
-  const scaleType = contract.isLogScale ? scaleLog : scaleLinear
   const xScale = scaleTime([start, end], [0, width - MARGIN_X])
-  const yScale = scaleType([contract.min, contract.max], [height - MARGIN_Y, 0])
+  const yScale = contract.isLogScale
+    ? scaleLog(
+        [Math.max(contract.min, 1), contract.max],
+        [height - MARGIN_Y, 0]
+      ).clamp(true) // make sure zeroes go to the bottom
+    : scaleLinear([contract.min, contract.max], [height - MARGIN_Y, 0])
+
   return (
     <div ref={containerRef}>
       {width && (
diff --git a/web/components/charts/generic-charts.tsx b/web/components/charts/generic-charts.tsx
index c8844899..34010a24 100644
--- a/web/components/charts/generic-charts.tsx
+++ b/web/components/charts/generic-charts.tsx
@@ -115,7 +115,7 @@ export const SingleValueDistributionChart = (props: {
     useState<PositionValue<DistributionPoint>>()
 
   const px = useCallback((p: DistributionPoint) => xScale(p[0]), [xScale])
-  const py0 = yScale(0)
+  const py0 = yScale(yScale.domain()[0])
   const py1 = useCallback((p: DistributionPoint) => yScale(p[1]), [yScale])
   const xBisector = bisector((p: DistributionPoint) => p[0])
 
@@ -209,11 +209,11 @@ export const MultiValueHistoryChart = (props: {
     const fmtY = (n: number) => (pct ? formatPct(n, 0) : formatLargeNumber(n))
 
     const [min, max] = yScale.domain()
-    const tickValues = getTickValues(min, max, h < 200 ? 3 : 5)
+    const pctTickValues = getTickValues(min, max, h < 200 ? 3 : 5)
     const xAxis = axisBottom<Date>(xScale)
-    const yAxis = axisLeft<number>(yScale)
-      .tickValues(tickValues)
-      .tickFormat(fmtY)
+    const yAxis = pct
+      ? axisLeft<number>(yScale).tickValues(pctTickValues).tickFormat(fmtY)
+      : axisLeft<number>(yScale)
 
     return { fmtX, fmtY, xAxis, yAxis }
   }, [h, pct, xScale, yScale])
@@ -311,7 +311,7 @@ export const SingleValueHistoryChart = (props: {
   const [mouseState, setMouseState] = useState<PositionValue<HistoryPoint>>()
 
   const px = useCallback((p: HistoryPoint) => xScale(p[0]), [xScale])
-  const py0 = yScale(0)
+  const py0 = yScale(yScale.domain()[0])
   const py1 = useCallback((p: HistoryPoint) => yScale(p[1]), [yScale])
   const xBisector = bisector((p: HistoryPoint) => p[0])
 
@@ -321,11 +321,11 @@ export const SingleValueHistoryChart = (props: {
     const fmtY = (n: number) => (pct ? formatPct(n, 0) : formatLargeNumber(n))
 
     const [min, max] = yScale.domain()
-    const tickValues = getTickValues(min, max, h < 200 ? 3 : 5)
+    const pctTickValues = getTickValues(min, max, h < 200 ? 3 : 5)
     const xAxis = axisBottom<Date>(xScale)
-    const yAxis = axisLeft<number>(yScale)
-      .tickValues(tickValues)
-      .tickFormat(fmtY)
+    const yAxis = pct
+      ? axisLeft<number>(yScale).tickValues(pctTickValues).tickFormat(fmtY)
+      : axisLeft<number>(yScale)
     return { fmtX, fmtY, xAxis, yAxis }
   }, [h, pct, xScale, yScale])