diff --git a/packages/wallet-sdk/src/provider/JSONRPC.ts b/packages/wallet-sdk/src/provider/JSONRPC.ts
new file mode 100644
index 0000000000..c861265480
--- /dev/null
+++ b/packages/wallet-sdk/src/provider/JSONRPC.ts
@@ -0,0 +1,179 @@
+// Copyright (c) 2018-2022 Coinbase, Inc. <https://www.coinbase.com/>
+// Licensed under the Apache License, version 2.0
+
+import { AddressString, HexString } from '../core/type';
+
+export type JSONRPCMethodName = keyof typeof JSONRPCMethods;
+
+export function isValidJSONRPCMethod(method: string): method is JSONRPCMethodName {
+  return method in JSONRPCMethods;
+}
+
+export type JSONRPCRequest<M extends JSONRPCMethodName> = {
+  jsonrpc: '2.0';
+  id: number;
+  method: M;
+  params: (typeof JSONRPCMethods)[M]['params'];
+};
+
+export type JSONRPCResponse<M extends JSONRPCMethodName> = {
+  jsonrpc: '2.0';
+  id: number;
+} & (
+  | {
+      error: {
+        code: number;
+        message: string;
+        data?: unknown;
+      };
+    }
+  | {
+      result: (typeof JSONRPCMethods)[M]['result'];
+    }
+);
+
+const JSONRPCMethods = {
+  eth_accounts: {
+    params: {} as never,
+    result: {} as AddressString[],
+  },
+  eth_coinbase: {
+    params: {} as never,
+    result: {} as AddressString,
+  },
+  net_version: {
+    params: {} as never,
+    result: {} as string,
+  },
+  eth_chainId: {
+    params: {} as never,
+    result: {} as string,
+  },
+  eth_uninstallFilter: {
+    params: {} as [HexString],
+    result: {} as boolean,
+  },
+  eth_requestAccounts: {
+    params: {} as never,
+    result: {} as AddressString[],
+  },
+  eth_sign: {
+    params: {} as [AddressString, Buffer],
+    result: {} as HexString,
+  },
+  eth_ecRecover: {
+    params: {} as [Buffer, Buffer],
+    result: {} as AddressString,
+  },
+  personal_sign: {
+    params: {} as [Buffer, AddressString],
+    result: {} as HexString,
+  },
+  personal_ecRecover: {
+    params: {} as [Buffer, Buffer],
+    result: {} as AddressString,
+  },
+  eth_signTransaction: {
+    params: {} as EthereumTransactionParams,
+    result: {} as HexString,
+  },
+  eth_sendRawTransaction: {
+    params: {} as [Buffer],
+    result: {} as HexString,
+  },
+  eth_sendTransaction: {
+    params: {} as EthereumTransactionParams,
+    result: {} as HexString,
+  },
+  eth_signTypedData_v1: {
+    params: {} as [object, AddressString],
+    result: {} as HexString,
+  },
+  eth_signTypedData_v2: {
+    params: {} as never,
+    result: {} as never,
+  },
+  eth_signTypedData_v3: {
+    params: {} as [AddressString, object],
+    result: {} as HexString,
+  },
+  eth_signTypedData_v4: {
+    params: {} as [AddressString, object],
+    result: {} as HexString,
+  },
+  eth_signTypedData: {
+    params: {} as [AddressString, object],
+    result: {} as HexString,
+  },
+  wallet_addEthereumChain: {
+    params: {} as [
+      {
+        chainId: string;
+        blockExplorerUrls?: string[];
+        chainName?: string;
+        iconUrls?: string[];
+        rpcUrls?: string[];
+        nativeCurrency?: {
+          name: string;
+          symbol: string;
+          decimals: number;
+        };
+      },
+    ],
+    result: null,
+  },
+  wallet_switchEthereumChain: {
+    params: {} as [
+      {
+        chainId: string;
+      },
+    ],
+    result: null,
+  },
+  wallet_watchAsset: {
+    params: {} as {
+      type: string;
+      options: {
+        address: string;
+        symbol: string;
+        decimals: number;
+        image?: string;
+      };
+    },
+    result: {} as boolean,
+  },
+  eth_subscribe: {
+    params: {} as [
+      'newHeads' | 'logs' | 'newPendingTransactions' | 'syncing',
+      {
+        address?: AddressString;
+        topics?: string[];
+      },
+    ],
+    result: {} as unknown,
+  },
+  eth_unsubscribe: {
+    params: {} as string[],
+    result: {} as unknown,
+  },
+  eth_newFilter: {
+    params: {} as unknown,
+    result: {} as HexString,
+  },
+  eth_newBlockFilter: {
+    params: {} as never,
+    result: {} as HexString,
+  },
+  eth_newPendingTransactionFilter: {
+    params: {} as never,
+    result: {} as HexString,
+  },
+  eth_getFilterChanges: {
+    params: {} as [HexString],
+    result: {} as unknown,
+  },
+  eth_getFilterLogs: {
+    params: {} as [HexString],
+    result: {} as unknown,
+  },
+} as const;
diff --git a/packages/wallet-sdk/src/provider/JSONRPCMethod.ts b/packages/wallet-sdk/src/provider/JSONRPCMethod.ts
deleted file mode 100644
index b5328bd689..0000000000
--- a/packages/wallet-sdk/src/provider/JSONRPCMethod.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright (c) 2018-2023 Coinbase, Inc. <https://www.coinbase.com/>
-// Licensed under the Apache License, version 2.0
-
-export type JSONRPCMethod =
-  // synchronous or asynchronous
-  | 'eth_accounts'
-  | 'eth_coinbase'
-  | 'net_version'
-  | 'eth_chainId'
-  | 'eth_uninstallFilter' // synchronous
-
-  // asynchronous only
-  | 'eth_requestAccounts'
-  | 'eth_sign'
-  | 'eth_ecRecover'
-  | 'personal_sign'
-  | 'personal_ecRecover'
-  | 'eth_signTransaction'
-  | 'eth_sendRawTransaction'
-  | 'eth_sendTransaction'
-  | 'eth_signTypedData_v1'
-  | 'eth_signTypedData_v2'
-  | 'eth_signTypedData_v3'
-  | 'eth_signTypedData_v4'
-  | 'eth_signTypedData'
-  | 'wallet_addEthereumChain'
-  | 'wallet_switchEthereumChain'
-  | 'wallet_watchAsset'
-
-  // asynchronous pub/sub
-  | 'eth_subscribe'
-  | 'eth_unsubscribe'
-
-  // asynchronous filter methods
-  | 'eth_newFilter'
-  | 'eth_newBlockFilter'
-  | 'eth_newPendingTransactionFilter'
-  | 'eth_getFilterChanges'
-  | 'eth_getFilterLogs';
diff --git a/packages/wallet-sdk/src/provider/JSONRPCRequest.ts b/packages/wallet-sdk/src/provider/JSONRPCRequest.ts
deleted file mode 100644
index 070ac261e4..0000000000
--- a/packages/wallet-sdk/src/provider/JSONRPCRequest.ts
+++ /dev/null
@@ -1,172 +0,0 @@
-import BN from 'bn.js';
-
-import { AddressString, HexString, IntNumber } from '../core/type';
-import { JSONRPCMethodName } from './JSONRPC';
-
-type EthereumTransactionParams = {
-  fromAddress: AddressString;
-  toAddress?: AddressString;
-  weiValue: BN;
-  data: Buffer;
-  nonce?: IntNumber;
-  gasPriceInWei?: BN;
-  maxFeePerGas?: BN; // in wei
-  maxPriorityFeePerGas?: BN; // in wei
-  gasLimit?: BN;
-  chainId: IntNumber;
-};
-
-type AddEthereumChainParams = {
-  chainId: string;
-  blockExplorerUrls?: string[];
-  chainName?: string;
-  iconUrls?: string[];
-  rpcUrls?: string[];
-  nativeCurrency?: {
-    name: string;
-    symbol: string;
-    decimals: number;
-  };
-};
-
-type WatchAssetParams = {
-  type: string;
-  options: {
-    address: string;
-    symbol?: string;
-    decimals?: number;
-    image?: string;
-  };
-};
-
-type SubscriptionType = 'newHeads' | 'logs' | 'newPendingTransactions' | 'syncing';
-
-export type JSONRPCRequest = {
-  jsonrpc: '2.0';
-  id: number;
-  method: JSONRPCMethodName;
-} & (
-  | {
-      method: 'eth_accounts';
-      params: never;
-    }
-  | {
-      method: 'eth_coinbase';
-      params: never;
-    }
-  | {
-      method: 'net_version';
-      params: never;
-    }
-  | {
-      method: 'eth_chainId';
-      params: never;
-    }
-  | {
-      method: 'eth_uninstallFilter';
-      params: [HexString];
-    }
-  | {
-      method: 'eth_requestAccounts';
-      params: never;
-    }
-  | {
-      method: 'eth_sign';
-      params: [AddressString, Buffer];
-    }
-  | {
-      method: 'eth_ecRecover';
-      params: [Buffer, Buffer];
-    }
-  | {
-      method: 'personal_sign';
-      params: [Buffer, AddressString];
-    }
-  | {
-      method: 'personal_ecRecover';
-      params: [Buffer, Buffer];
-    }
-  | {
-      method: 'eth_signTransaction';
-      params: EthereumTransactionParams;
-    }
-  | {
-      method: 'eth_sendRawTransaction';
-      params: [Buffer];
-    }
-  | {
-      method: 'eth_sendTransaction';
-      params: EthereumTransactionParams;
-    }
-  | {
-      method: 'eth_signTypedData_v1';
-      params: [object, AddressString];
-    }
-  | {
-      // This is not supported
-      method: 'eth_signTypedData_v2';
-      params: never;
-    }
-  | {
-      method: 'eth_signTypedData_v3';
-      params: [AddressString, object];
-    }
-  | {
-      method: 'eth_signTypedData_v4';
-      params: [AddressString, object];
-    }
-  | {
-      method: 'eth_signTypedData';
-      params: [AddressString, object];
-    }
-  | {
-      method: 'wallet_addEthereumChain';
-      params: [AddEthereumChainParams];
-    }
-  | {
-      method: 'wallet_switchEthereumChain';
-      params: [
-        {
-          chainId: string;
-        },
-      ];
-    }
-  | {
-      method: 'wallet_watchAsset';
-      params: WatchAssetParams | [WatchAssetParams];
-    }
-  | {
-      method: 'eth_subscribe';
-      params: [
-        SubscriptionType,
-        {
-          address?: AddressString;
-          topics?: string[];
-        },
-      ];
-    }
-  | {
-      method: 'eth_unsubscribe';
-      params: string[];
-    }
-  | {
-      method: 'eth_newFilter';
-      params: unknown;
-    }
-  | {
-      method: 'eth_newBlockFilter';
-      params: never;
-    }
-  | {
-      method: 'eth_newPendingTransactionFilter';
-      params: never;
-    }
-  | {
-      method: 'eth_getFilterChanges';
-      params: [HexString];
-    }
-  | {
-      method: 'eth_getFilterLogs';
-      params: [HexString];
-    }
-);
diff --git a/packages/wallet-sdk/src/provider/JSONRPCResponse.ts b/packages/wallet-sdk/src/provider/JSONRPCResponse.ts
deleted file mode 100644
index d47fc0fff5..0000000000
--- a/packages/wallet-sdk/src/provider/JSONRPCResponse.ts
+++ /dev/null
@@ -1,128 +0,0 @@
-import { AddressString, HexString } from '../core/type';
-import { JSONRPCMethodName } from './JSONRPC';
-
-export type JSONRPCResponse = {
-  jsonrpc: '2.0';
-  id: number;
-  method?: JSONRPCMethodName;
-} & (
-  | {
-      error: {
-        code: number;
-        message: string;
-        data?: unknown;
-      };
-    }
-  | {
-      method: 'eth_accounts';
-      result: string[];
-    }
-  | {
-      method: 'eth_coinbase';
-      result: string;
-    }
-  | {
-      method: 'net_version';
-      result: string;
-    }
-  | {
-      method: 'eth_chainId';
-      result: string;
-    }
-  | {
-      method: 'eth_uninstallFilter';
-      result: boolean;
-    }
-  | {
-      method: 'eth_requestAccounts';
-      result: AddressString[];
-    }
-  | {
-      method: 'eth_sign';
-      result: HexString;
-    }
-  | {
-      method: 'eth_ecRecover';
-      result: AddressString;
-    }
-  | {
-      method: 'personal_sign';
-      result: HexString;
-    }
-  | {
-      method: 'personal_ecRecover';
-      result: AddressString;
-    }
-  | {
-      method: 'eth_signTransaction';
-      result: HexString;
-    }
-  | {
-      method: 'eth_sendRawTransaction';
-      result: HexString;
-    }
-  | {
-      method: 'eth_sendTransaction';
-      result: HexString;
-    }
-  | {
-      method: 'eth_signTypedData_v1';
-      result: HexString;
-    }
-  | {
-      method: 'eth_signTypedData_v2';
-      result: never;
-    }
-  | {
-      method: 'eth_signTypedData_v3';
-      result: HexString;
-    }
-  | {
-      method: 'eth_signTypedData_v4';
-      result: HexString;
-    }
-  | {
-      method: 'eth_signTypedData';
-      result: HexString;
-    }
-  | {
-      method: 'wallet_addEthereumChain';
-      result: null;
-    }
-  | {
-      method: 'wallet_switchEthereumChain';
-      result: null;
-    }
-  | {
-      method: 'wallet_watchAsset';
-      result: boolean;
-    }
-  | {
-      method: 'eth_subscribe';
-      result: unknown;
-    }
-  | {
-      method: 'eth_unsubscribe';
-      result: unknown;
-    }
-  | {
-      method: 'eth_newFilter';
-      result: HexString;
-    }
-  | {
-      method: 'eth_newBlockFilter';
-      result: HexString;
-    }
-  | {
-      method: 'eth_newPendingTransactionFilter';
-      result: HexString;
-    }
-  | {
-      method: 'eth_getFilterChanges';
-      result: unknown;
-    }
-  | {
-      method: 'eth_getFilterLogs';
-      result: unknown;
-    }
-);