diff --git a/core/src/exchanges/myriad/normalizer.ts b/core/src/exchanges/myriad/normalizer.ts
index 60513406..88b8dea9 100644
--- a/core/src/exchanges/myriad/normalizer.ts
+++ b/core/src/exchanges/myriad/normalizer.ts
@@ -19,6 +19,14 @@ const MYRIAD_PROMOTED_EVENT_KEYS = [
     'id', 'title', 'markets',
 ] as const;
 
+const WEI_SCALE = BigInt('1000000000000000000');
+const PRECISION_SCALE = BigInt('1000000000000');
+
+function weiStringToNumber(value: string): number {
+    const scaled = (BigInt(value) * PRECISION_SCALE) / WEI_SCALE;
+    return Number(scaled) / Number(PRECISION_SCALE);
+}
+
 function selectTimeframe(interval: CandleInterval): string {
     switch (interval) {
         case '1m':
@@ -213,15 +221,14 @@ export class MyriadNormalizer implements IExchangeNormalizer<MyriadRawMarket, My
     }
 
     normalizeClobOrderBook(raw: { bids: [string, string][]; asks: [string, string][] }): OrderBook {
-        const WEI = 1e18;
         return {
             bids: raw.bids.map(([priceWei, sizeWei]) => ({
-                price: Number(priceWei) / WEI,
-                size: Number(sizeWei) / WEI,
+                price: weiStringToNumber(priceWei),
+                size: weiStringToNumber(sizeWei),
             })),
             asks: raw.asks.map(([priceWei, sizeWei]) => ({
-                price: Number(priceWei) / WEI,
-                size: Number(sizeWei) / WEI,
+                price: weiStringToNumber(priceWei),
+                size: weiStringToNumber(sizeWei),
             })),
             timestamp: Date.now(),
         };
diff --git a/core/test/normalizers/exchange-normalizers-2.test.ts b/core/test/normalizers/exchange-normalizers-2.test.ts
index 19f07bd0..17b3bf0f 100644
--- a/core/test/normalizers/exchange-normalizers-2.test.ts
+++ b/core/test/normalizers/exchange-normalizers-2.test.ts
@@ -565,6 +565,17 @@ describe('MyriadNormalizer', () => {
             const result = normalizer.normalizeMarket(noExpiry)!;
             expect(result.resolutionDate.getTime()).toBe(0);
         });
+
+        it('preserves sub-1 wei prices without rounding to 1', () => {
+            const result = normalizer.normalizeClobOrderBook({
+                bids: [['999999999999999999', '250000000000000000'], ['100000000000000000', '1']],
+                asks: [['500000000000000000', '1000000000000000000']],
+            });
+
+            expect(result.bids[0].price).toBeLessThan(1);
+            expect(result.bids[0].price).toBeCloseTo(0.999999999999);
+            expect(result.bids[0].size).toBeCloseTo(0.25);
+        });
     });
 
     // -----------------------------------------------------------------------