diff --git a/src/ChainApi.test.ts b/src/ChainApi.test.ts
index a326bd7..28d658f 100644
--- a/src/ChainApi.test.ts
+++ b/src/ChainApi.test.ts
@@ -192,6 +192,16 @@ test("ChainApi - sumTokens - use tokensAndOwners", async () => {
   expect(res['ethereum:0x419B8ED155180A8c9C64145e76DaD49c0A4Efb97'.toLowerCase()]).toEqual('3284260000000000000000')
   expect(res['ethereum:' + nullAddress]).toEqual('3371095284832904')
 })
+test("ChainApi - sumTokens - use ownerTokens", async () => {
+  const api = new ChainApi({})
+  const res = await api.sumTokens({
+    ownerTokens: [
+      [['0x419B8ED155180A8c9C64145e76DaD49c0A4Efb97', nullAddress], '0x9a849A108764a5cE2Ab4CD3208071B304a9Ac99A',],
+    ]
+  })
+  expect(res['ethereum:0x419B8ED155180A8c9C64145e76DaD49c0A4Efb97'.toLowerCase()]).toEqual('3284260000000000000000')
+  expect(res['ethereum:' + nullAddress]).toEqual('3371095284832904')
+})
 
 test("ChainApi - sumTokens - use tokensAndOwners2", async () => {
   const api = new ChainApi({})
@@ -272,30 +282,8 @@ test("ChainApi - sumTokens - era", async () => {
   })
 })
 
-test("ChainApi - sumTokens - mantle", async () => {
-  const api = new ChainApi({ chain: 'mantle' })
-  const polkaMultisig = '0x3BfC20f0B9aFcAcE800D73D2191166FF16540258'
-  const blacklistedToken = '0xfe633a37c77241b825f1cf39afff44cb56242b77'
-  const blacklistedToken2Owner = '0xc5Fba8936315A57217222593f0A6Bb0Bdcc2985B'
-  const res = await api.sumTokens({
-    tokensAndOwners2: [
-      [nullAddress, nullAddress],
-      [polkaMultisig, polkaMultisig, polkaMultisig],
-    ],
-    tokensAndOwners: [
-      [nullAddress, polkaMultisig],
-      [nullAddress, polkaMultisig],
-    ],
-    blacklistedTokens: [blacklistedToken],
-    blacklistedOwners: [blacklistedToken2Owner],
-    tokens: [nullAddress],
-    owners: [polkaMultisig, blacklistedToken2Owner],
-  })
-  expect(res).toEqual({})
-})
-
-test("ChainApi - sumTokens - neon_evm", async () => {
-  const api = new ChainApi({ chain: 'neon_evm' })
+test("ChainApi - sumTokens - base", async () => {
+  const api = new ChainApi({ chain: 'base' })
   const polkaMultisig = '0x3BfC20f0B9aFcAcE800D73D2191166FF16540258'
   const blacklistedToken = '0xfe633a37c77241b825f1cf39afff44cb56242b77'
   const blacklistedToken2Owner = '0xc5Fba8936315A57217222593f0A6Bb0Bdcc2985B'
diff --git a/src/ChainApi.ts b/src/ChainApi.ts
index b588ed3..2b502fa 100644
--- a/src/ChainApi.ts
+++ b/src/ChainApi.ts
@@ -124,11 +124,13 @@ export class ChainApi {
     tokensAndOwners2 = [],
     blacklistedTokens = [],
     blacklistedOwners = [],
+    ownerTokens = [],
   }: {
     tokens?: string[],
     owners?: string[],
     tokensAndOwners?: string[][],
     tokensAndOwners2?: string[][],
+    ownerTokens?: any[],
     blacklistedTokens?: string[],
     blacklistedOwners?: string[],
   }): Promise<Balances> {
@@ -138,6 +140,9 @@ export class ChainApi {
 
     if (tokens.length && owners.length)
       tokensAndOwners.push(...tokens.map(i => owners.map(j => [i, j])).flat())
+    
+    for (const [tokens, owner] of ownerTokens)
+      tokens.forEach((i: any) => tokensAndOwners.push([i, owner]))
 
     tokensAndOwners = getUniqueTokensAndOwners(tokensAndOwners, this.chain as string)
     blacklistedOwners = getUniqueAddresses(blacklistedOwners)
diff --git a/src/abi/multicall3.ts b/src/abi/multicall3.ts
index 4ea8744..b00b2b9 100644
--- a/src/abi/multicall3.ts
+++ b/src/abi/multicall3.ts
@@ -61,6 +61,7 @@ const DEPLOYMENT_BLOCK = {
   era: 3908235,
   mantle: 3962,
   neon_evm: 205939275,
+  base: 5022,
 } as {
   [key: string | Chain]: number
 }
diff --git a/src/providers.json b/src/providers.json
index 2e3be81..e5641f7 100644
--- a/src/providers.json
+++ b/src/providers.json
@@ -800,5 +800,11 @@
       "https://neon-proxy-mainnet.solana.p2p.org"
     ],
     "chainId": 245022934
+  },
+  "base": {
+    "rpc": [
+      "https://developer-access-mainnet.base.org/"
+    ],
+    "chainId": 8453
   }
 }
\ No newline at end of file