Feature/sdk cache manager

src/index.ts

@@ -85,6 +85,8 @@ export {
 
 export type { RpcProviderConfig } from './types/config.js'
 
+export { Contract, type ContractClient } from './core/Contract.js'
+export { HDWallet, createHDWallet, type HDWalletOptions } from './wallet/HDWallet.js'
 export {
   Contract,
   type ContractClient,

src/network/provider.ts

@@ -77,6 +77,15 @@ export interface ProviderOptions {
   fetchFn?: typeof fetch
 }
 
+export interface ProviderOptions {
+  /** Maximum number of retry attempts on HTTP 429 rate limit responses (default: 3). */
+  maxRetries?: number
+  /** Base delay in milliseconds for exponential backoff calculations (default: 100). */
+  baseDelayMs?: number
+  /** Custom fetch implementation for network requests or testing. */
+  fetchFn?: typeof fetch
+}
+
 export class Provider {
   public readonly network: NetworkProfile
   public readonly chainId: number