diff --git a/src/app/api/proxy/route.ts b/src/app/api/proxy/route.ts
index 32d837b..a3de5bb 100644
--- a/src/app/api/proxy/route.ts
+++ b/src/app/api/proxy/route.ts
@@ -86,8 +86,9 @@ export async function POST(request: Request) {
     let bodyForLog: JsonValue;
 
     if (endpoint.contentType === 'multipart' && formData) {
-      // Remove our internal field
+      // Remove our internal fields
       formData.delete('_endpointId');
+      formData.delete('_priceCalc');
       fetchOptions = {
         method: endpoint.method,
         headers,
diff --git a/src/components/EndpointForm.tsx b/src/components/EndpointForm.tsx
index 0af03b1..156323c 100644
--- a/src/components/EndpointForm.tsx
+++ b/src/components/EndpointForm.tsx
@@ -471,15 +471,43 @@ export function EndpointForm({ endpoint, onSubmit, onPriceCheck, isSubmitting }:
     try {
       const filteredValues = buildFilteredValues();
 
-      const res = await fetch('/api/proxy', {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({
-          ...filteredValues,
-          _endpointId: endpoint.id,
-          _priceCalc: true,
-        }),
-      });
+      let res: Response;
+
+      // For multipart endpoints with files, send as FormData (includes files for price calc)
+      const hasFiles = Object.keys(files).length > 0;
+      if (endpoint.contentType === 'multipart' && hasFiles) {
+        const formData = new FormData();
+        formData.append('_endpointId', endpoint.id);
+        formData.append('_priceCalc', 'true');
+
+        Object.entries(filteredValues).forEach(([key, value]) => {
+          if (value !== undefined && value !== '') {
+            formData.append(key, String(value));
+          }
+        });
+
+        Object.entries(files).forEach(([key, fileOrFiles]) => {
+          const param = endpoint.params.find((p) => p.name === key);
+          if (param?.visibleWhen && !isFieldVisible(param)) return;
+          if (Array.isArray(fileOrFiles)) {
+            fileOrFiles.forEach((file) => formData.append(key, file));
+          } else {
+            formData.append(key, fileOrFiles);
+          }
+        });
+
+        res = await fetch('/api/proxy', { method: 'POST', body: formData });
+      } else {
+        res = await fetch('/api/proxy', {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({
+            ...filteredValues,
+            _endpointId: endpoint.id,
+            _priceCalc: true,
+          }),
+        });
+      }
 
       const data = await res.json();
 
diff --git a/src/lib/endpoint-registry.ts b/src/lib/endpoint-registry.ts
index 04de839..0eba027 100644
--- a/src/lib/endpoint-registry.ts
+++ b/src/lib/endpoint-registry.ts
@@ -14,7 +14,7 @@ export const ENDPOINT_GROUPS: EndpointGroupMeta[] = [
     id: 'video-generation',
     label: 'Video Generation',
     icon: '🎬',
-    description: 'Text-to-Video, Image-to-Video',
+    description: 'Text-to-Video, Image-to-Video, Video Replace',
   },
   {
     id: 'audio-generation',
@@ -370,6 +370,55 @@ export const ENDPOINTS: EndpointDefinition[] = [
     ],
   },
 
+  {
+    id: 'video-replace',
+    name: 'Video Replace',
+    group: 'video-generation',
+    method: 'POST',
+    path: '/videos/replace',
+    description: 'Replace a person in video with character from reference image',
+    contentType: 'multipart',
+    isAsync: true,
+    hasPriceCalc: true,
+    priceCalcPath: '/videos/replace/price',
+    params: [
+      {
+        name: 'video',
+        label: 'Input Video',
+        type: 'file',
+        required: true,
+        accept: 'video/*,.mp4,.mpeg,.mov,.avi,.wmv,.ogg',
+        description: 'Input video file (MP4, MPEG, QuickTime, AVI, WMV, OGG)',
+      },
+      {
+        name: 'ref_image',
+        label: 'Reference Image',
+        type: 'file',
+        required: true,
+        accept: 'image/*',
+        description: 'Reference character image (JPG, PNG, GIF, BMP, WebP, max 10MB)',
+      },
+      promptParam(false),
+      modelSelectParam(),
+      {
+        name: 'width',
+        label: 'Width',
+        type: 'number',
+        required: false,
+        description: 'Output width in pixels (empty = use input video width)',
+      },
+      {
+        name: 'height',
+        label: 'Height',
+        type: 'number',
+        required: false,
+        description: 'Output height in pixels (empty = use input video height)',
+      },
+      stepsParam(),
+      seedParam(),
+    ],
+  },
+
   // ── Audio / TTS ───────────────────────────────────────────
   {
     id: 'txt2audio',