diff --git a/src/alexSDK.ts b/src/alexSDK.ts
index 34ce2a2..44343af 100644
--- a/src/alexSDK.ts
+++ b/src/alexSDK.ts
@@ -6,8 +6,13 @@ import { getYAmountFromXAmount } from './helpers/RateHelper';
 import { runSpot, TxToBroadCast } from './helpers/SwapHelper';
 import { findCurrencyByNativeAddress } from './utils/currencyUtils';
 import { fetchLatestPrices } from './utils/currencyPrice';
+import { AlexConfig, assignConfig } from './config';
 
 export class AlexSDK {
+  static configure(config: Partial<AlexConfig>) {
+    assignConfig(config);
+  }
+
   getFeeRate(from: Currency, to: Currency): Promise<bigint> {
     return getLiquidityProviderFee(from, to, AMMSwapPool.ammTokens);
   }
diff --git a/src/config.ts b/src/config.ts
index ccb711b..86a933b 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -1,2 +1,15 @@
-export const CONTRACT_DEPLOYER = 'SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9';
-export const API_HOST = "https://stacks-node-api.alexlab.co"
+const CONTRACT_DEPLOYER = 'SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9';
+const API_HOST = 'https://stacks-node-api.alexlab.co';
+const IS_MAINNET = true;
+
+export const configs = {
+  IS_MAINNET,
+  CONTRACT_DEPLOYER,
+  API_HOST,
+};
+
+export type AlexConfig = typeof configs;
+
+export function assignConfig(newConfigs: Partial<AlexConfig>) {
+  Object.assign(configs, newConfigs);
+}
diff --git a/src/generated/smartContractHelpers/codegenImport.ts b/src/generated/smartContractHelpers/codegenImport.ts
index f80dfd7..a7f9442 100644
--- a/src/generated/smartContractHelpers/codegenImport.ts
+++ b/src/generated/smartContractHelpers/codegenImport.ts
@@ -6,7 +6,7 @@ import {
 } from '@stacks/transactions';
 import { addressResult, contractResult, transcoders } from 'clarity-codegen';
 import type { Decoder } from 'clarity-codegen/lib/runtime/types';
-import { CONTRACT_DEPLOYER } from '../../config';
+import { configs } from '../../config';
 
 export * from 'clarity-codegen';
 
@@ -18,7 +18,7 @@ export function principalCV(principal: string): PrincipalCV {
   if (principal.startsWith('SP') || principal.startsWith('ST')) {
     return standardPrincipalCV(principal);
   }
-  return contractPrincipalCV(CONTRACT_DEPLOYER, principal);
+  return contractPrincipalCV(configs.CONTRACT_DEPLOYER, principal);
 }
 
 export const principleResult: Decoder<string> = (result) => {
diff --git a/src/helpers/SwapHelper.ts b/src/helpers/SwapHelper.ts
index 695ab4c..507d5b7 100644
--- a/src/helpers/SwapHelper.ts
+++ b/src/helpers/SwapHelper.ts
@@ -1,5 +1,5 @@
 import { AMMSwapPool } from '../utils/ammPool';
-import { AlexVault, transfer } from '../utils/postConditions';
+import { transfer } from '../utils/postConditions';
 import {
   ClarityValue,
   FungibleConditionCode,
@@ -9,11 +9,9 @@ import {
 import {
   OpenCallFunctionDescriptor,
   ParameterObjOfDescriptor,
-  ReadonlyFunctionDescriptor,
-  ReturnTypeOfDescriptor,
 } from 'clarity-codegen';
 import { AlexContracts } from '../generated/smartContract/contracts_Alex';
-import { CONTRACT_DEPLOYER } from '../config';
+import { configs } from '../config';
 import { Currency } from '../currency';
 
 export type TxToBroadCast = {
@@ -48,7 +46,7 @@ const composeTx: <
     contractName,
     functionName: String(functionName),
     functionArgs: clarityArgs,
-    contractAddress: CONTRACT_DEPLOYER,
+    contractAddress: configs.CONTRACT_DEPLOYER,
     postConditions,
   };
 };
@@ -62,6 +60,7 @@ export function runSpot(
   router: Currency[],
   ammPools: AMMSwapPool.PoolTokens[]
 ): TxToBroadCast {
+  const AlexVault = `${configs.CONTRACT_DEPLOYER}.alex-vault`;
   const ammRoute = AMMSwapPool.getRoute(currencyX, currencyY, ammPools);
   const middleSteps = router.slice(1, -1);
   if (ammRoute.length === 0) {
diff --git a/src/utils/postConditions.ts b/src/utils/postConditions.ts
index d207cf8..90f44ba 100644
--- a/src/utils/postConditions.ts
+++ b/src/utils/postConditions.ts
@@ -5,12 +5,12 @@ import {
   FungiblePostCondition,
   STXPostCondition,
 } from '@stacks/transactions';
-import { CONTRACT_DEPLOYER } from '../config';
-import { getCurrencyNativeAddress, getCurrencyNativeScale } from './currencyUtils';
+import {
+  getCurrencyNativeAddress,
+  getCurrencyNativeScale,
+} from './currencyUtils';
 import { Currency } from '../currency';
 
-export const AlexVault = `${CONTRACT_DEPLOYER}.alex-vault`;
-
 export function transfer(
   senderAddress: string,
   currency: Currency,
diff --git a/src/utils/readonlyCallExecutor.ts b/src/utils/readonlyCallExecutor.ts
index 10661df..82133f7 100644
--- a/src/utils/readonlyCallExecutor.ts
+++ b/src/utils/readonlyCallExecutor.ts
@@ -1,6 +1,6 @@
 import { callReadOnlyFunction, ClarityValue } from '@stacks/transactions';
-import { API_HOST, CONTRACT_DEPLOYER } from '../config';
-import { StacksMainnet } from '@stacks/network';
+import { configs } from '../config';
+import { StacksMainnet, StacksTestnet } from '@stacks/network';
 import {
   ParameterObjOfDescriptor,
   ReadonlyFunctionDescriptor,
@@ -21,10 +21,14 @@ type ReadonlyCallExecutor = (
 const defaultReadonlyCallExecutor: ReadonlyCallExecutor = async (options) => {
   return callReadOnlyFunction({
     ...options,
-    senderAddress: CONTRACT_DEPLOYER,
-    network: new StacksMainnet({
-      url: API_HOST,
-    }),
+    senderAddress: configs.CONTRACT_DEPLOYER,
+    network: configs.IS_MAINNET
+      ? new StacksMainnet({
+          url: configs.API_HOST,
+        })
+      : new StacksTestnet({
+          url: configs.API_HOST,
+        }),
   });
 };
 
@@ -53,7 +57,7 @@ export async function readonlyCall<
     contractName,
     functionName: String(functionName),
     functionArgs: clarityArgs,
-    contractAddress: CONTRACT_DEPLOYER,
+    contractAddress: configs.CONTRACT_DEPLOYER,
   });
   return functionDescriptor.output.decode(result);
 }
diff --git a/test/alexSDK.test.ts b/test/alexSDK.test.ts
index f9de371..0e0aa4f 100644
--- a/test/alexSDK.test.ts
+++ b/test/alexSDK.test.ts
@@ -1,4 +1,4 @@
-import { CONTRACT_DEPLOYER } from '../src/config';
+import { configs } from '../src/config';
 import { Currency } from '../src/currency';
 import { AlexSDK } from '../src/alexSDK';
 
@@ -26,7 +26,7 @@ describe.skip('AlexSDK', () => {
     const sdk = new AlexSDK();
     const router = await sdk.getRouter(Currency.STX, Currency.DIKO);
     const result = await sdk.runSwap(
-      CONTRACT_DEPLOYER,
+      configs.CONTRACT_DEPLOYER,
       Currency.STX,
       Currency.DIKO,
       BigInt(2) * BigInt(1e8),