diff --git a/.idea/jsonSchemas.xml b/.idea/jsonSchemas.xml
index 551a7ac1..466eeea8 100644
--- a/.idea/jsonSchemas.xml
+++ b/.idea/jsonSchemas.xml
@@ -3,6 +3,22 @@
   <component name="JsonSchemaMappingsProjectConfiguration">
     <state>
       <map>
+        <entry key="JSON Schema version 4">
+          <value>
+            <SchemaInfo>
+              <option name="name" value="JSON Schema version 4" />
+              <option name="relativePathToSchema" value="http://json-schema.org/draft-04/schema" />
+              <option name="applicationDefined" value="true" />
+              <option name="patterns">
+                <list>
+                  <Item>
+                    <option name="path" value="libs/shared/util-event/schema/_sample.schema.json" />
+                  </Item>
+                </list>
+              </option>
+            </SchemaInfo>
+          </value>
+        </entry>
         <entry key="JSON Schema version 7">
           <value>
             <SchemaInfo>
diff --git a/libs/blockchain-watcher/feature-app/src/lib/Klass/PaymentCreatedEvent.ts b/libs/blockchain-watcher/feature-app/src/lib/Klass/PaymentCreatedEvent.ts
index 0c63def0..d28e0674 100644
--- a/libs/blockchain-watcher/feature-app/src/lib/Klass/PaymentCreatedEvent.ts
+++ b/libs/blockchain-watcher/feature-app/src/lib/Klass/PaymentCreatedEvent.ts
@@ -11,8 +11,9 @@ import {
   validateSync,
 } from 'class-validator'
 import { IsEthAddress } from '../util/IsEthAddress'
+import {PaymentCreatedEvent as IPaymentCreatedEvent} from '@solomon/shared/util-event'
 
-export class PaymentCreatedEvent {
+export class PaymentCreatedEvent implements IPaymentCreatedEvent {
   @IsUUID()
   @IsString()
   id: string = v4()
@@ -47,8 +48,8 @@ export class PaymentCreatedEvent {
   discount: number = 0
 
   @Min(0)
-  @IsNumber()
-  ethPaid: number = 0
+  @IsString()
+  ethPaid: string = ''
 
   isValid() {
     let errArr = validateSync(this)
diff --git a/libs/shared/util-event/src/generateEventInterface.ts b/libs/shared/util-event/src/generateEventInterface.ts
index 59c8ac9b..28c1770a 100644
--- a/libs/shared/util-event/src/generateEventInterface.ts
+++ b/libs/shared/util-event/src/generateEventInterface.ts
@@ -1,8 +1,34 @@
 import { compile, compileFromFile } from 'json-schema-to-typescript'
-import { write, writeFile } from "fs-extra";
+import { readFile, write, writeFile } from "fs-extra";
 import path from "path";
+import { readdir } from "fs-extra";
 
 export const generateEventInterface = async ()=> {
-  let res = await compileFromFile(path.resolve(__dirname, '..', '_sample.schema.json'))
-  await writeFile(path.resolve(__dirname, 'test.schema.ts'), res, 'utf-8')
+  const interfaceFolderPath = path.resolve(__dirname, '..', 'interface')
+  const schemaFolderPath = path.resolve(__dirname, '..', 'schema')
+  const schemaFileNames = await readdir(schemaFolderPath)
+  let indexStr = ``
+
+  for(let schemaFileName of schemaFileNames) {
+    try {
+      const schemaFilePath = path.resolve(schemaFolderPath, schemaFileName)
+      const interfaceFileName = schemaFileName.replace('.schema.json', '.schema.ts')
+      const interfaceFilePath = path.resolve(interfaceFolderPath, interfaceFileName)
+
+      let interfaceStr = await compileFromFile(schemaFilePath, {
+        unreachableDefinitions: true,
+      })
+
+      interfaceStr = interfaceStr.replace(/\[k: string]: unknown;/g, ``)
+
+      await writeFile(interfaceFilePath, interfaceStr, 'utf-8')
+      indexStr += `export * from '../interface/${interfaceFileName.replace('.ts', '')}'\n`
+      console.log(`${interfaceFilePath} generated.`)
+    } catch (err) {
+      console.error(err)
+      console.log(`${schemaFileName} generate fail.`)
+    }
+  }
+
+  await writeFile(path.resolve(__dirname, 'index.ts'), indexStr)
 }
diff --git a/libs/shared/util-event/src/index.ts b/libs/shared/util-event/src/index.ts
index e69de29b..700c92f3 100644
--- a/libs/shared/util-event/src/index.ts
+++ b/libs/shared/util-event/src/index.ts
@@ -0,0 +1 @@
+export * from '../interface/_sample.schema'