From 2823a67af230b16926ff2e30faefbfb238863cc3 Mon Sep 17 00:00:00 2001
From: jxom <7336481+jxom@users.noreply.github.com>
Date: Fri, 2 May 2025 17:25:04 +1000
Subject: [PATCH] fix: `wallet_getCapabilities` params

---
 .changeset/breezy-grapes-appear.md    | 5 +++++
 src/actions/wallet/getCapabilities.ts | 6 +++++-
 src/clients/decorators/wallet.ts      | 8 ++++----
 src/types/eip1193.ts                  | 6 +++++-
 4 files changed, 19 insertions(+), 6 deletions(-)
 create mode 100644 .changeset/breezy-grapes-appear.md

diff --git a/.changeset/breezy-grapes-appear.md b/.changeset/breezy-grapes-appear.md
new file mode 100644
index 0000000000..ce0f50a141
--- /dev/null
+++ b/.changeset/breezy-grapes-appear.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Passed `chainId` to `wallet_getCapabilities`.
diff --git a/src/actions/wallet/getCapabilities.ts b/src/actions/wallet/getCapabilities.ts
index 6742593ccb..fc8786cdcd 100644
--- a/src/actions/wallet/getCapabilities.ts
+++ b/src/actions/wallet/getCapabilities.ts
@@ -11,6 +11,7 @@ import type {
 } from '../../types/eip1193.js'
 import type { Prettify } from '../../types/utils.js'
 import type { RequestErrorType } from '../../utils/buildRequest.js'
+import { numberToHex } from '../../utils/encoding/toHex.js'
 
 export type GetCapabilitiesParameters<
   chainId extends number | undefined = undefined,
@@ -59,9 +60,12 @@ export async function getCapabilities<
 
   const account_ = account ? parseAccount(account) : undefined
 
+  const params = chainId
+    ? ([account_?.address, [numberToHex(chainId)]] as const)
+    : ([account_?.address] as const)
   const capabilities_raw = await client.request({
     method: 'wallet_getCapabilities',
-    params: [account_?.address],
+    params,
   })
 
   const capabilities = {} as WalletCapabilitiesRecord<
diff --git a/src/clients/decorators/wallet.ts b/src/clients/decorators/wallet.ts
index bdbd876f53..5b7360fcd9 100644
--- a/src/clients/decorators/wallet.ts
+++ b/src/clients/decorators/wallet.ts
@@ -238,9 +238,9 @@ export type WalletActions<
    *   account: '0xA0Cf798816D4b9b9866b5330EEa46a18382f251e',
    * })
    */
-  getCapabilities: (
-    parameters?: GetCapabilitiesParameters,
-  ) => Promise<GetCapabilitiesReturnType>
+  getCapabilities: <chainId extends number | undefined>(
+    parameters?: GetCapabilitiesParameters<chainId>,
+  ) => Promise<GetCapabilitiesReturnType<chainId>>
   /**
    * Returns the chain ID associated with the current network.
    *
@@ -963,7 +963,7 @@ export function walletActions<
     deployContract: (args) => deployContract(client, args),
     getAddresses: () => getAddresses(client),
     getCallsStatus: (args) => getCallsStatus(client, args),
-    getCapabilities: () => getCapabilities(client),
+    getCapabilities: (args) => getCapabilities(client, args),
     getChainId: () => getChainId(client),
     getPermissions: () => getPermissions(client),
     prepareAuthorization: (args) => prepareAuthorization(client, args),
diff --git a/src/types/eip1193.ts b/src/types/eip1193.ts
index e4d2496deb..b848e61abd 100644
--- a/src/types/eip1193.ts
+++ b/src/types/eip1193.ts
@@ -1795,7 +1795,11 @@ export type WalletRpcSchema = [
    */
   {
     Method: 'wallet_getCapabilities'
-    Parameters?: [Address | undefined] | undefined
+    Parameters?:
+      | readonly []
+      | readonly [Address | undefined]
+      | readonly [Address | undefined, readonly Hex[] | undefined]
+      | undefined
     ReturnType: Prettify<WalletCapabilitiesRecord>
   },
   /**