diff --git a/.changeset/adding_BlastSepolia.md b/.changeset/adding_BlastSepolia.md
new file mode 100644
index 000000000..50bbeb249
--- /dev/null
+++ b/.changeset/adding_BlastSepolia.md
@@ -0,0 +1,7 @@
+---
+"@usedapp/core": patch
+---
+
+Adding the network blast Sepolia testnet:
+
+https://blast.io/
\ No newline at end of file
diff --git a/packages/core/src/constants/chainId.ts b/packages/core/src/constants/chainId.ts
index 78407bca7..ce256ed0b 100644
--- a/packages/core/src/constants/chainId.ts
+++ b/packages/core/src/constants/chainId.ts
@@ -10,6 +10,7 @@ import {
   AvalancheTestnet,
   Aurora,
   AuroraTestnet,
+  BlastSepoliaTestnet,
   BSC,
   BSCTestnet,
   Canto,
@@ -142,6 +143,7 @@ export const DEFAULT_SUPPORTED_CHAINS = [
   MantleTestnet,
   KromaSepoliaTestnet,
   KromaMainnet,
+  BlastSepoliaTestnet,
 ]
 
 export enum ChainId {
@@ -215,4 +217,5 @@ export enum ChainId {
   MantleTestnet = 5001,
   Kroma = 255,
   KromaSepolia = 2358,
+  BlastSepolia = 168587773,
 }
diff --git a/packages/core/src/model/chain/blast.ts b/packages/core/src/model/chain/blast.ts
new file mode 100644
index 000000000..d2b4585ab
--- /dev/null
+++ b/packages/core/src/model/chain/blast.ts
@@ -0,0 +1,25 @@
+import { Chain } from '../../constants'
+import { getAddressLink, getTransactionLink } from '../../helpers/chainExplorerLink'
+
+const blastSepoliaTestnetExplorerUrl = 'https://testnet.blastscan.io'
+
+export const BlastSepoliaTestnet: Chain = {
+  chainId: 168587773,
+  chainName: 'Blast Sepolia Testnet',
+  isTestChain: true,
+  isLocalChain: false,
+  multicallAddress: '0xcA11bde05977b3631167028862bE2a173976CA11',
+  rpcUrl: 'https://sepolia.blast.io',
+  nativeCurrency: {
+    name: 'SepoliaETH',
+    symbol: 'ETH',
+    decimals: 18,
+  },
+  blockExplorerUrl: blastSepoliaTestnetExplorerUrl,
+  getExplorerAddressLink: getAddressLink(blastSepoliaTestnetExplorerUrl),
+  getExplorerTransactionLink: getTransactionLink(blastSepoliaTestnetExplorerUrl),
+}
+
+export default {
+  BlastSepoliaTestnet,
+}
diff --git a/packages/core/src/model/chain/index.ts b/packages/core/src/model/chain/index.ts
index bc945e614..04c0e5232 100644
--- a/packages/core/src/model/chain/index.ts
+++ b/packages/core/src/model/chain/index.ts
@@ -3,6 +3,7 @@ export * from './local'
 export * from './arbitrum'
 export * from './astar'
 export * from './avalanche'
+export * from './blast'
 export * from './bsc'
 export * from './boba'
 export * from './canto'