diff --git a/packages/precompiles/src/viem/__tests__/chain.spec.ts b/packages/precompiles/src/viem/__tests__/chain.spec.ts
index 1cfd54ce..ffb6c7b6 100644
--- a/packages/precompiles/src/viem/__tests__/chain.spec.ts
+++ b/packages/precompiles/src/viem/__tests__/chain.spec.ts
@@ -1,20 +1,58 @@
-import { seiLocal } from '../chain';
+import { seiLocal, seiMainnet, seiTestnet } from "../chain";
 
-describe('seiLocal chain', () => {
-	it('should be a valid chain definition', () => {
-		expect(seiLocal).toMatchObject({
-			id: 713714,
-			name: 'Sei Local',
-			nativeCurrency: {
-				name: 'Sei',
-				symbol: 'SEI',
-				decimals: 18
-			},
-			rpcUrls: {
-				default: {
-					http: ['http://localhost:8545']
-				}
-			}
-		});
-	});
+describe("seiLocal chain", () => {
+  it("should be a valid chain definition", () => {
+    expect(seiLocal).toMatchObject({
+      id: 713714,
+      name: "Sei Local",
+      nativeCurrency: {
+        name: "Sei",
+        symbol: "SEI",
+        decimals: 18,
+      },
+      rpcUrls: {
+        default: {
+          http: ["http://localhost:8545"],
+        },
+      },
+    });
+  });
+});
+
+describe("seiTestnet chain", () => {
+  it("should be a valid chain definition", () => {
+    expect(seiTestnet).toMatchObject({
+      id: 1328,
+      name: "Sei Testnet",
+      nativeCurrency: {
+        name: "Sei",
+        symbol: "SEI",
+        decimals: 18,
+      },
+      rpcUrls: {
+        default: {
+          http: ["https://evm-rpc-testnet.sei-apis.com"],
+        },
+      },
+    });
+  });
+});
+
+describe("seiMainnet chain", () => {
+  it("should be a valid chain definition", () => {
+    expect(seiMainnet).toMatchObject({
+      id: 1329,
+      name: "Sei Mainnet",
+      nativeCurrency: {
+        name: "Sei",
+        symbol: "SEI",
+        decimals: 18,
+      },
+      rpcUrls: {
+        default: {
+          http: ["https://evm-rpc.sei-apis.com"],
+        },
+      },
+    });
+  });
 });
diff --git a/packages/precompiles/src/viem/chain.ts b/packages/precompiles/src/viem/chain.ts
index ae0db9f2..e3f281f7 100644
--- a/packages/precompiles/src/viem/chain.ts
+++ b/packages/precompiles/src/viem/chain.ts
@@ -1,16 +1,38 @@
-import { defineChain } from 'viem';
+import { defineChain } from "viem";
 
 /**
  * The Viem chain definition for the Sei local chain.
  * @category Chain
  */
 export const seiLocal = defineChain({
-	id: 713714,
-	name: 'Sei Local',
-	nativeCurrency: { name: 'Sei', symbol: 'SEI', decimals: 18 },
-	rpcUrls: {
-		default: {
-			http: ['http://localhost:8545']
-		}
-	}
+  id: 713714,
+  name: "Sei Local",
+  nativeCurrency: { name: "Sei", symbol: "SEI", decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ["http://localhost:8545"],
+    },
+  },
+});
+
+export const seiTestnet = defineChain({
+  id: 1328,
+  name: "Sei Testnet",
+  nativeCurrency: { name: "Sei", symbol: "SEI", decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ["https://evm-rpc-testnet.sei-apis.com"],
+    },
+  },
+});
+
+export const seiMainnet = defineChain({
+  id: 1329,
+  name: "Sei Mainnet",
+  nativeCurrency: { name: "Sei", symbol: "SEI", decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ["https://evm-rpc.sei-apis.com"],
+    },
+  },
 });