diff --git a/package.json b/package.json
index 9a6a62b..c149c07 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fhevmjs",
-  "version": "0.5.0-6",
+  "version": "0.5.0-7",
   "description": "fhEVM SDK for blockchain using TFHE",
   "main": "lib/node/index.js",
   "types": "lib/node/node.d.ts",
diff --git a/src/node.ts b/src/node.ts
index ceeed48..efa8079 100644
--- a/src/node.ts
+++ b/src/node.ts
@@ -10,4 +10,4 @@ if (!global.fetch) {
 
 export * from './sdk';
 export * from './tfhe';
-export { clientKeyDecryptor } from './utils';
+export { clientKeyDecryptor, getCiphertextCallParams } from './utils';
diff --git a/src/sdk/index.test.ts b/src/sdk/index.test.ts
index ca811c8..842dae4 100644
--- a/src/sdk/index.test.ts
+++ b/src/sdk/index.test.ts
@@ -1,7 +1,6 @@
 import sodium from 'libsodium-wrappers';
 import { createInstance } from './index';
 import { createTfhePublicKey } from '../tfhe';
-import { fromHexString, bigIntToBytes } from '../utils';
 
 describe('index', () => {
   let tfhePublicKey: string;
@@ -20,6 +19,7 @@ describe('index', () => {
     expect(instance.createEIP712).toBeDefined();
     expect(instance.generateKeypair).toBeDefined();
     expect(instance.createEncryptedInput).toBeDefined();
+    expect(instance.getPublicKey()).toBe(tfhePublicKey);
   });
 
   it('creates an instance for mock', async () => {
diff --git a/src/sdk/index.ts b/src/sdk/index.ts
index b97bcfd..633eb4c 100644
--- a/src/sdk/index.ts
+++ b/src/sdk/index.ts
@@ -12,7 +12,11 @@ import { createEncryptedInput } from './encrypt';
 import { generateKeypair, createEIP712, EIP712 } from './keypair';
 import { reencryptRequest } from './reencrypt';
 
-export { getPublicKeyCallParams } from './network';
+export {
+  getPublicKeyCallParams,
+  getPublicKeyFromCoprocessor,
+  getPublicKeyFromNetwork,
+} from './network';
 
 type FhevmInstanceConfig = {
   chainId: number;
@@ -41,6 +45,7 @@ export type FhevmInstance = {
     contractAddress: string,
     userAddress: string,
   ) => Promise<bigint>;
+  getPublicKey: () => string | null;
 };
 
 export const createInstance = async (
@@ -57,7 +62,8 @@ export const createInstance = async (
   if (typeof chainId !== 'number') throw new Error('chainId must be a number.');
 
   if (coprocessorUrl && !publicKey) {
-    publicKey = await getPublicKeyFromCoprocessor(coprocessorUrl);
+    const data = await getPublicKeyFromCoprocessor(coprocessorUrl);
+    publicKey = data.publicKey;
   } else if (networkUrl && !publicKey) {
     publicKey = await getPublicKeyFromNetwork(networkUrl);
   }
@@ -86,5 +92,6 @@ export const createInstance = async (
     generateKeypair,
     createEIP712: createEIP712(chainId),
     reencrypt: reencryptRequest(reencryptionUrl),
+    getPublicKey: () => publicKey || null,
   };
 };
diff --git a/src/sdk/network.test.ts b/src/sdk/network.test.ts
index fc1c78c..de77b7a 100644
--- a/src/sdk/network.test.ts
+++ b/src/sdk/network.test.ts
@@ -1,7 +1,11 @@
 import { TfheCompactPublicKey, TfheClientKey } from 'node-tfhe';
 import { createTfheKeypair } from '../tfhe';
 import { createEncryptedInput } from './encrypt';
-import { getPublicKeyCallParams, getPublicKeyFromNetwork } from './network';
+import {
+  getPublicKeyCallParams,
+  getPublicKeyFromCoprocessor,
+  getPublicKeyFromNetwork,
+} from './network';
 import { fromHexString } from '../utils';
 
 describe('network', () => {
@@ -18,7 +22,7 @@ describe('network', () => {
   });
 
   it('get public key params', async () => {
-    const params = await getPublicKeyCallParams();
+    const params = getPublicKeyCallParams();
     expect(params.to).toBe('0x000000000000000000000000000000000000005d');
     expect(params.data).toBe('0xd9d47bb001');
   });
diff --git a/src/utils.test.ts b/src/utils.test.ts
index 79e2a1b..ca8d2eb 100644
--- a/src/utils.test.ts
+++ b/src/utils.test.ts
@@ -4,6 +4,7 @@ import {
   bytesToHex,
   clientKeyDecryptor,
   fromHexString,
+  getCiphertextCallParams,
   toHexString,
 } from './utils';
 import { createTfheKeypair } from './tfhe';
@@ -138,4 +139,12 @@ describe('decrypt', () => {
     const v = await d.decryptAddress(toHexString(c));
     expect(v).toBe('0x8ba1f109551bd432803012645ac136ddd64dba72');
   });
+
+  it('returns ciphertext call params', async () => {
+    const params = getCiphertextCallParams(BigInt(23));
+    expect(params.data).toBe(
+      '0xff627e770000000000000000000000000000000000000000000000000000000000000017',
+    );
+    expect(params.to).toBe('0x000000000000000000000000000000000000005d');
+  });
 });
diff --git a/src/utils.ts b/src/utils.ts
index 304d249..229b027 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -68,3 +68,12 @@ export const clientKeyDecryptor = (clientKeySer: Uint8Array) => {
     },
   };
 };
+
+export const getCiphertextCallParams = (handle: bigint) => {
+  let hex = handle.toString(16);
+  hex = hex.padStart(64, '0');
+  return {
+    to: '0x000000000000000000000000000000000000005d',
+    data: '0xff627e77' + hex,
+  };
+};