feat(api-nodes): add pricing for new LTXV-2 models (#6307)

## Summary

For the upcoming LTXV API nodes.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6307-feat-api-nodes-add-pricing-for-new-LTXV-2-models-2986d73d365081db9994deffc219c6c4)
by [Unito](https://www.unito.io)

Author: bigcat88

src/composables/node/useNodePricing.ts

@@ -169,6 +169,46 @@ const byteDanceVideoPricingCalculator = (node: LGraphNode): string => {
     : `$${minCost.toFixed(2)}-$${maxCost.toFixed(2)}/Run`
 }
 
+const ltxvPricingCalculator = (node: LGraphNode): string => {
+  const modelWidget = node.widgets?.find(
+    (w) => w.name === 'model'
+  ) as IComboWidget
+  const durationWidget = node.widgets?.find(
+    (w) => w.name === 'duration'
+  ) as IComboWidget
+  const resolutionWidget = node.widgets?.find(
+    (w) => w.name === 'resolution'
+  ) as IComboWidget
+
+  const fallback = '$0.04-0.24/second'
+  if (!modelWidget || !durationWidget || !resolutionWidget) return fallback
+
+  const model = String(modelWidget.value).toLowerCase()
+  const resolution = String(resolutionWidget.value).toLowerCase()
+  const seconds = parseFloat(String(durationWidget.value))
+  const priceByModel: Record<string, Record<string, number>> = {
+    'ltx-2 (pro)': {
+      '1920x1080': 0.06,
+      '2560x1440': 0.12,
+      '3840x2160': 0.24
+    },
+    'ltx-2 (fast)': {
+      '1920x1080': 0.04,
+      '2560x1440': 0.08,
+      '3840x2160': 0.16
+    }
+  }
+
+  const modelTable = priceByModel[model]
+  if (!modelTable) return fallback
+
+  const pps = modelTable[resolution]
+  if (!pps) return fallback
+
+  const cost = (pps * seconds).toFixed(2)
+  return `$${cost}/Run`
+}
+
 // ---- constants ----
 const SORA_SIZES = {
   BASIC: new Set(['720x1280', '1280x720']),
@@ -1694,6 +1734,12 @@ const apiNodeCosts: Record<string, { displayPrice: string | PricingFunction }> =
     },
     WanImageToImageApi: {
       displayPrice: '$0.03/Run'
+    },
+    LtxvApiTextToVideo: {
+      displayPrice: ltxvPricingCalculator
+    },
+    LtxvApiImageToVideo: {
+      displayPrice: ltxvPricingCalculator
     }
   }
 
@@ -1796,7 +1842,9 @@ export const useNodePricing = () => {
       ByteDanceFirstLastFrameNode: ['model', 'duration', 'resolution'],
       ByteDanceImageReferenceNode: ['model', 'duration', 'resolution'],
       WanTextToVideoApi: ['duration', 'size'],
-      WanImageToVideoApi: ['duration', 'resolution']
+      WanImageToVideoApi: ['duration', 'resolution'],
+      LtxvApiTextToVideo: ['model', 'duration', 'resolution'],
+      LtxvApiImageToVideo: ['model', 'duration', 'resolution']
     }
     return widgetMap[nodeType] || []
   }

tests-ui/tests/composables/node/useNodePricing.test.ts

@@ -2189,4 +2189,54 @@ describe('useNodePricing', () => {
       expect(price).toBe('$0.05-0.15/second')
     })
   })
+
+  describe('dynamic pricing - LtxvApiTextToVideo', () => {
+    it('should return $0.30 for Pro 1080p 5s', () => {
+      const { getNodeDisplayPrice } = useNodePricing()
+      const node = createMockNode('LtxvApiTextToVideo', [
+        { name: 'model', value: 'LTX-2 (Pro)' },
+        { name: 'duration', value: '5' },
+        { name: 'resolution', value: '1920x1080' }
+      ])
+
+      const price = getNodeDisplayPrice(node)
+      expect(price).toBe('$0.30/Run') // 0.06 * 5
+    })
+
+    it('should parse "10s" duration strings', () => {
+      const { getNodeDisplayPrice } = useNodePricing()
+      const node = createMockNode('LtxvApiTextToVideo', [
+        { name: 'model', value: 'LTX-2 (Fast)' },
+        { name: 'duration', value: '10' },
+        { name: 'resolution', value: '3840x2160' }
+      ])
+
+      const price = getNodeDisplayPrice(node)
+      expect(price).toBe('$1.60/Run') // 0.16 * 10
+    })
+
+    it('should fall back when a required widget is missing (no resolution)', () => {
+      const { getNodeDisplayPrice } = useNodePricing()
+      const node = createMockNode('LtxvApiTextToVideo', [
+        { name: 'model', value: 'LTX-2 (Pro)' },
+        { name: 'duration', value: '5' }
+        // missing resolution
+      ])
+
+      const price = getNodeDisplayPrice(node)
+      expect(price).toBe('$0.04-0.24/second')
+    })
+
+    it('should fall back for unknown model', () => {
+      const { getNodeDisplayPrice } = useNodePricing()
+      const node = createMockNode('LtxvApiTextToVideo', [
+        { name: 'model', value: 'LTX-3 (Pro)' },
+        { name: 'duration', value: 5 },
+        { name: 'resolution', value: '1920x1080' }
+      ])
+
+      const price = getNodeDisplayPrice(node)
+      expect(price).toBe('$0.04-0.24/second')
+    })
+  })
 })