diff --git a/scripts/generate-erc20.js b/scripts/generate-erc20.js
index 0c741cf..4324393 100644
--- a/scripts/generate-erc20.js
+++ b/scripts/generate-erc20.js
@@ -15,6 +15,7 @@ const Mumbai = require("../src/erc20/mumbai.json");
 const PancakeTop100 = require("../src/erc20/pancake-top100.json");
 const { fetchDebankLogoURI } = require("./fetch-debank-logo-uri");
 const { addChainId, generateTokenList } = require("./shared");
+const  {invalidContractList}  = require('./invalid-contract')
 
 const getMatamaskLogoURI = (url) =>
   `https://raw.githubusercontent.com/MetaMask/contract-metadata/master/images/${url}`;
@@ -97,8 +98,9 @@ const getUntreatedTokens = async () => {
 
 const start = async () => {
   const tokens = await getUntreatedTokens();
+  const tmpTokensList = await invalidContractList(tokens)
   const MaskTokenList = generateTokenList(
-    tokens
+    tmpTokensList
       .map((x) => ({
         ...x,
         address: EthereumAddress.checksumAddress(x.address),
diff --git a/scripts/invalid-contract.js b/scripts/invalid-contract.js
new file mode 100644
index 0000000..854ebfb
--- /dev/null
+++ b/scripts/invalid-contract.js
@@ -0,0 +1,34 @@
+
+const fetch = require("node-fetch");
+
+const baseUrl = (chainId, address) =>`https://api.erc721validator.org/basic?test=5&chainId=${chainId}&contract=${address}`
+
+async function fetchInvalidERC721ContractResult (address) {
+    const response = await fetch(baseUrl(address))
+    if (!response.ok) return {data: {result: false}}
+    const json = await response.json()
+    return json.data
+}
+
+function delay(num) {
+    return new Promise(resolve => {
+      setTimeout(() => {
+        resolve(2)
+      }, num)
+    })
+  }
+
+async function invalidContractList (tokensList) {
+    const tokens = []
+    for (let i = 0; i < tokensList.length; i++) {
+        const token = tokensList[i]
+        
+        const result = await fetchInvalidERC721ContractResult(token.chainId, token.address)
+        if (!result.result) tokens.push(tokens)
+        await delay(1000)
+    }
+
+    return tokens
+}
+
+exports.invalidContractList = invalidContractList;
\ No newline at end of file