diff --git a/e2e/helper.ts b/e2e/helper.ts
index 4c7cabc5..a010fdc4 100644
--- a/e2e/helper.ts
+++ b/e2e/helper.ts
@@ -31,7 +31,7 @@ export const env = {
 
 const setupAll = async ({ endpoint, blockHash, mockSignatureHost }: SetupOption) => {
   const wsProvider = new WsProvider(endpoint)
-  const api = new Api(wsProvider)
+  const api = new Api(wsProvider, { SetEvmOrigin: { payload: {}, extrinsic: {} } })
 
   await api.isReady
 
@@ -67,7 +67,15 @@ const setupAll = async ({ endpoint, blockHash, mockSignatureHost }: SetupOption)
       tasks.updateListeningPort(listeningPort)
 
       const wsProvider2 = new WsProvider(`ws://localhost:${listeningPort}`)
-      const api2 = await ApiPromise.create({ provider: wsProvider2 })
+      const api2 = await ApiPromise.create({
+        provider: wsProvider2,
+        signedExtensions: {
+          SetEvmOrigin: {
+            extrinsic: {},
+            payload: {},
+          },
+        },
+      })
 
       return {
         chain,
diff --git a/src/api.ts b/src/api.ts
index cf1e87bf..f7aad5bb 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -1,3 +1,4 @@
+import { ExtDef } from '@polkadot/types/extrinsic/signedExtensions/types'
 import { HexString } from '@polkadot/util/types'
 import { ProviderInterface } from '@polkadot/rpc-provider/types'
 
@@ -31,8 +32,11 @@ export class Api {
   #chain: Promise<string>
   #chainProperties: Promise<ChainProperties>
 
-  constructor(provider: ProviderInterface) {
+  readonly signedExtensions: ExtDef
+
+  constructor(provider: ProviderInterface, signedExtensions?: ExtDef) {
     this.#provider = provider
+    this.signedExtensions = signedExtensions || {}
     this.#isReady = new Promise((resolve, reject) => {
       if (this.#provider.isConnected) {
         setTimeout(resolve, 500)
diff --git a/src/blockchain/block.ts b/src/blockchain/block.ts
index 03f78cce..d6544ddc 100644
--- a/src/blockchain/block.ts
+++ b/src/blockchain/block.ts
@@ -43,6 +43,7 @@ export class Block {
     this.#extrinsics = block?.extrinsics
     this.#baseStorage = block?.storage ?? new RemoteStorageLayer(chain.api, hash, chain.db)
     this.#storages = []
+    this.#registry = parentBlock?.registry
   }
 
   get header(): Header | Promise<Header> {
@@ -155,7 +156,11 @@ export class Block {
         registry.setMetadata(
           new Metadata(registry, data),
           undefined,
-          objectSpread<ExtDef>({}, getSpecExtensions(registry, chain, version.specName), {})
+          objectSpread<ExtDef>(
+            {},
+            getSpecExtensions(registry, chain, version.specName),
+            this.#chain.api.signedExtensions
+          )
         )
         return registry
       })