diff --git a/package-lock.json b/package-lock.json
index 230235f..a06af06 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@orionprotocol/sdk",
-  "version": "0.20.42-rc3",
+  "version": "0.20.42-rc4",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@orionprotocol/sdk",
-      "version": "0.20.42-rc3",
+      "version": "0.20.42-rc4",
       "hasInstallScript": true,
       "license": "ISC",
       "dependencies": {
diff --git a/package.json b/package.json
index 89b3910..6ce7550 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@orionprotocol/sdk",
-  "version": "0.20.42-rc3",
+  "version": "0.20.42-rc4",
   "description": "Orion Protocol SDK",
   "main": "./lib/index.cjs",
   "module": "./lib/index.js",
diff --git a/src/Unit/Exchange/swapMarket.ts b/src/Unit/Exchange/swapMarket.ts
index c4c0b05..be7350a 100644
--- a/src/Unit/Exchange/swapMarket.ts
+++ b/src/Unit/Exchange/swapMarket.ts
@@ -4,7 +4,7 @@ import { Exchange__factory } from '@orionprotocol/contracts/lib/ethers-v6/index.
 import getBalances from '../../utils/getBalances.js';
 import BalanceGuard from '../../BalanceGuard.js';
 import getAvailableSources from '../../utils/getAvailableFundsSources.js';
-import { INTERNAL_PROTOCOL_PRECISION, NATIVE_CURRENCY_PRECISION, SWAP_THROUGH_ORION_POOL_GAS_LIMIT } from '../../constants/index.js';
+import { INTERNAL_PROTOCOL_PRECISION, NATIVE_CURRENCY_PRECISION, SWAP_THROUGH_ORION_POOL_GAS_LIMIT } from '../../constants';
 import getNativeCryptocurrencyName from '../../utils/getNativeCryptocurrencyName.js';
 import { calculateFeeInFeeAsset, denormalizeNumber, normalizeNumber } from '../../utils/index.js';
 import { signOrder } from '../../crypt/index.js';
@@ -37,7 +37,6 @@ type PoolSwap = {
 
 export type Swap = AggregatorOrder | PoolSwap;
 
-
 const isValidSingleSwap = (singleSwap: Omit<SingleSwap, 'factory'> & { factory: string }): singleSwap is SingleSwap => {
   return isValidFactory(singleSwap.factory);
 }
diff --git a/src/crypt/hashOrder.ts b/src/crypt/hashOrder.ts
index 23bc474..8a5c5d2 100644
--- a/src/crypt/hashOrder.ts
+++ b/src/crypt/hashOrder.ts
@@ -14,6 +14,8 @@ const hashOrder = (order: Order) => ethers.solidityPackedKeccak256(
     'uint64',
     'uint64',
     'uint64',
+    'uint64',
+    'uint64',
     'uint8',
   ],
   [
@@ -24,10 +26,12 @@ const hashOrder = (order: Order) => ethers.solidityPackedKeccak256(
     order.quoteAsset,
     order.matcherFeeAsset,
     order.amount,
+    order.targetChainId,
     order.price,
     order.matcherFee,
     order.nonce,
     order.expiration,
+    order.secretHash,
     order.buySide === 1 ? '0x01' : '0x00',
   ],
 );
diff --git a/src/crypt/signLockOrder.ts b/src/crypt/signLockOrder.ts
new file mode 100644
index 0000000..b70c3ea
--- /dev/null
+++ b/src/crypt/signLockOrder.ts
@@ -0,0 +1,71 @@
+import type { TypedDataSigner } from '@ethersproject/abstract-signer';
+import { ethers } from 'ethers';
+import ORDER_TYPES from '../constants/orderTypes.js';
+import type { LockOrder, SignedLockOrder, SupportedChainId } from '../types.js';
+import getDomainData from './getDomainData.js';
+import generateSecret from '../utils/generateSecret';
+
+const DEFAULT_EXPIRATION = 29 * 24 * 60 * 60 * 1000; // 29 days
+
+type SignerWithTypedDataSign = ethers.Signer & TypedDataSigner;
+
+export type LockOrderProps = {
+  userAddress: string // адрес юзера который хочет сделать лок
+  senderAddress: string // broker
+  asset: string
+  amount: ethers.BigNumberish
+  targetChainId: ethers.BigNumberish
+  sign: string // подпись юзера
+  signer: ethers.Signer
+  chainId: SupportedChainId
+}
+
+export const signLockOrder = async ({
+  userAddress,
+  senderAddress,
+  sign,
+  amount,
+  targetChainId,
+  asset,
+  chainId,
+  signer
+}: LockOrderProps) => {
+  const nonce = Date.now();
+  const expiration = nonce + DEFAULT_EXPIRATION;
+  const secret = generateSecret();
+  const secretHash = ethers.keccak256(secret);
+
+  const order: LockOrder = {
+    user: userAddress,
+    sender: senderAddress,
+    expiration,
+    asset,
+    amount,
+    targetChainId,
+    secretHash,
+    sign
+  };
+
+  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+  const typedDataSigner = signer as SignerWithTypedDataSign;
+
+  const signature = await typedDataSigner.signTypedData(
+    getDomainData(chainId),
+    ORDER_TYPES,
+    order,
+  );
+
+  // https://github.com/poap-xyz/poap-fun/pull/62#issue-928290265
+  // "Signature's v was always send as 27 or 28, but from Ledger was 0 or 1"
+  const fixedSignature = ethers.Signature.from(signature).serialized;
+
+  // if (!fixedSignature) throw new Error("Can't sign order");
+
+  const signedOrder: SignedLockOrder = {
+    ...order,
+    signature: fixedSignature,
+    secret
+  };
+
+  return signedOrder;
+};
diff --git a/src/crypt/signOrder.ts b/src/crypt/signOrder.ts
index fca41a7..7008935 100644
--- a/src/crypt/signOrder.ts
+++ b/src/crypt/signOrder.ts
@@ -1,12 +1,13 @@
 import type { TypedDataSigner } from '@ethersproject/abstract-signer';
 import { BigNumber } from 'bignumber.js';
 import { ethers } from 'ethers';
-import { INTERNAL_PROTOCOL_PRECISION } from '../constants/index.js';
+import { INTERNAL_PROTOCOL_PRECISION } from '../constants';
 import ORDER_TYPES from '../constants/orderTypes.js';
 import type { Order, SignedOrder, SupportedChainId } from '../types.js';
 import normalizeNumber from '../utils/normalizeNumber.js';
 import getDomainData from './getDomainData.js';
 import hashOrder from './hashOrder.js';
+import generateSecret from '../utils/generateSecret';
 
 const DEFAULT_EXPIRATION = 29 * 24 * 60 * 60 * 1000; // 29 days
 
@@ -24,9 +25,12 @@ export const signOrder = async (
   serviceFeeAssetAddr: string,
   signer: ethers.Signer,
   chainId: SupportedChainId,
+  targetChainId?: ethers.BigNumberish,
 ) => {
   const nonce = Date.now();
   const expiration = nonce + DEFAULT_EXPIRATION;
+  const secret = generateSecret();
+  const secretHash = ethers.keccak256(secret);
 
   const order: Order = {
     senderAddress,
@@ -51,6 +55,8 @@ export const signOrder = async (
     )),
     nonce,
     expiration,
+    secretHash,
+    targetChainId,
     buySide: side === 'BUY' ? 1 : 0,
   };
 
@@ -73,6 +79,7 @@ export const signOrder = async (
     ...order,
     id: hashOrder(order),
     signature: fixedSignature,
+    secret
   };
   return signedOrder;
 };
diff --git a/src/services/Aggregator/index.ts b/src/services/Aggregator/index.ts
index e38b024..019e7cc 100644
--- a/src/services/Aggregator/index.ts
+++ b/src/services/Aggregator/index.ts
@@ -8,12 +8,17 @@ import errorSchema from './schemas/errorSchema.js';
 import placeAtomicSwapSchema from './schemas/placeAtomicSwapSchema.js';
 import { AggregatorWS } from './ws';
 import { atomicSwapHistorySchema } from './schemas/atomicSwapHistorySchema.js';
-import type { BasicAuthCredentials, SignedCancelOrderRequest, SignedOrder } from '../../types.js';
+import type {
+  BasicAuthCredentials,
+  NetworkShortName,
+  SignedCancelOrderRequest,
+  SignedLockOrder,
+  SignedOrder
+} from '../../types.js';
 import {
   pairConfigSchema, aggregatedOrderbookSchema,
   exchangeOrderbookSchema, poolReservesSchema,
 } from './schemas/index.js';
-import type networkCodes from '../../constants/networkCodes.js';
 import toUpperCase from '../../utils/toUpperCase.js';
 import httpToWS from '../../utils/httpToWS.js';
 import { ethers } from 'ethers';
@@ -55,6 +60,7 @@ class Aggregator {
     this.getTradeProfits = this.getTradeProfits.bind(this);
     this.placeAtomicSwap = this.placeAtomicSwap.bind(this);
     this.placeOrder = this.placeOrder.bind(this);
+    this.placeLockOrder = this.placeLockOrder.bind(this);
     this.cancelOrder = this.cancelOrder.bind(this);
     this.checkWhitelisted = this.checkWhitelisted.bind(this);
     this.getLockedBalance = this.getLockedBalance.bind(this);
@@ -236,6 +242,39 @@ class Aggregator {
     );
   };
 
+  placeLockOrder = (
+    signedLockOrder: SignedLockOrder,
+    rawExchangeRestrictions?: string | undefined,
+  ) => {
+    const headers = {
+      'Content-Type': 'application/json',
+      Accept: 'application/json',
+      ...this.basicAuthHeaders,
+    };
+
+    const url = new URL(`${this.apiUrl}/api/v1/cross-chain`);
+
+    return fetchWithValidation(
+      url.toString(),
+      z.object({
+        orderId: z.string(),
+        placementRequests: z.array(
+          z.object({
+            amount: z.number(),
+            brokerAddress: z.string(),
+            exchange: z.string(),
+          }),
+        ).optional(),
+      }),
+      {
+        headers,
+        method: 'POST',
+        body: JSON.stringify({ ...signedLockOrder, rawExchangeRestrictions }),
+      },
+      errorSchema,
+    );
+  };
+
   cancelOrder = (signedCancelOrderRequest: SignedCancelOrderRequest) => fetchWithValidation(
     `${this.apiUrl}/api/v1/order`,
     cancelOrderSchema,
@@ -291,7 +330,7 @@ class Aggregator {
     );
   };
 
-  getCrossChainAssetsByNetwork = (sourceChain: Uppercase<typeof networkCodes[number]>) => {
+  getCrossChainAssetsByNetwork = (sourceChain: NetworkShortName) => {
     const url = new URL(`${this.apiUrl}/api/v1/cross-chain/assets`);
     url.searchParams.append('sourceChain', sourceChain);
 
@@ -354,7 +393,7 @@ class Aggregator {
    */
   placeAtomicSwap = (
     secretHash: string,
-    sourceNetworkCode: Uppercase<typeof networkCodes[number]>,
+    sourceNetworkCode: NetworkShortName,
   ) => fetchWithValidation(
     `${this.apiUrl}/api/v1/atomic-swap`,
     placeAtomicSwapSchema,
@@ -376,6 +415,7 @@ class Aggregator {
   /**
    * Get placed atomic swaps. Each atomic swap received from this list has a target chain corresponding to this Aggregator
    * @param sender Sender address
+   * @param limit
    * @returns Fetch promise
    */
   getHistoryAtomicSwaps = (sender: string, limit = 1000) => {
diff --git a/src/services/Aggregator/ws/index.ts b/src/services/Aggregator/ws/index.ts
index 69d214c..2f63237 100644
--- a/src/services/Aggregator/ws/index.ts
+++ b/src/services/Aggregator/ws/index.ts
@@ -82,22 +82,22 @@ type SwapInfoSubscription = {
 type AddressUpdateUpdate = {
   kind: 'update'
   balances: Partial<
-    Record<
-      string,
-      Balance
+        Record<
+            string,
+            Balance
+        >
     >
-  >
   order?: z.infer<typeof orderUpdateSchema> | z.infer<typeof fullOrderSchema> | undefined
 }
 
 type AddressUpdateInitial = {
   kind: 'initial'
   balances: Partial<
-    Record<
-      string,
-      Balance
+        Record<
+            string,
+            Balance
+        >
     >
-  >
   orders?: Array<z.infer<typeof fullOrderSchema>> | undefined // The field is not defined if the user has no orders
 }
 
@@ -122,22 +122,22 @@ const exclusiveSubscriptions = [
 ] as const;
 
 type BufferLike =
-  | string
-  | Buffer
-  | DataView
-  | number
-  | ArrayBufferView
-  | Uint8Array
-  | ArrayBuffer
-  | SharedArrayBuffer
-  | readonly unknown[]
-  | readonly number[]
-  | { valueOf: () => ArrayBuffer }
-  | { valueOf: () => SharedArrayBuffer }
-  | { valueOf: () => Uint8Array }
-  | { valueOf: () => readonly number[] }
-  | { valueOf: () => string }
-  | { [Symbol.toPrimitive]: (hint: string) => string };
+    | string
+    | Buffer
+    | DataView
+    | number
+    | ArrayBufferView
+    | Uint8Array
+    | ArrayBuffer
+    | SharedArrayBuffer
+    | readonly unknown[]
+    | readonly number[]
+    | { valueOf: () => ArrayBuffer }
+    | { valueOf: () => SharedArrayBuffer }
+    | { valueOf: () => Uint8Array }
+    | { valueOf: () => readonly number[] }
+    | { valueOf: () => string }
+    | { [Symbol.toPrimitive]: (hint: string) => string };
 
 const isSubType = (subType: string): subType is keyof Subscription => Object.values(SubscriptionType).some((t) => t === subType);
 
@@ -201,6 +201,7 @@ class AggregatorWS {
   }
 
   private messageQueue: BufferLike[] = [];
+
   private sendWsMessage(message: BufferLike) {
     if (this.ws?.readyState === WebSocket.OPEN) {
       this.ws.send(message);
@@ -228,6 +229,7 @@ class AggregatorWS {
   }
 
   private hearbeatIntervalId: ReturnType<typeof setInterval> | undefined;
+
   private setupHeartbeat() {
     const heartbeat = () => {
       if (this.isAlive) {
@@ -328,11 +330,11 @@ class AggregatorWS {
   }
 
   /**
-   * Returns newest subscription id for given id. Subscription id can be changed during resubscription.
-   * This function ensure that old subscription id will be replaced with newest one.
-   * @param id Id of subscription
-   * @returns Newest subscription id
-   */
+     * Returns newest subscription id for given id. Subscription id can be changed during resubscription.
+     * This function ensure that old subscription id will be replaced with newest one.
+     * @param id Id of subscription
+     * @returns Newest subscription id
+     */
   getNewestSubscriptionId(id: string): string {
     const newId = this.subIdReplacements[id];
     if (newId !== undefined && newId !== id) {
diff --git a/src/types.ts b/src/types.ts
index 7511476..2fd40b0 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -3,8 +3,10 @@ import type factories from './constants/factories.js';
 import type { BigNumber } from 'bignumber.js';
 import type subOrderStatuses from './constants/subOrderStatuses.js';
 import type positionStatuses from './constants/positionStatuses.js';
-import type { knownEnvs } from './config/schemas/index.js';
+import type { knownEnvs } from './config/schemas';
 import type getHistory from './Orion/bridge/getHistory.js';
+import type { ethers } from 'ethers';
+import type { networkCodes } from './constants';
 
 export type DeepPartial<T> = T extends object ? {
   [P in keyof T]?: DeepPartial<T[P]>;
@@ -47,14 +49,33 @@ export type Order = {
   matcherFee: number // uint64
   nonce: number // uint64
   expiration: number // uint64
+  secretHash: string // uint64
   buySide: 0 | 1 // uint8, 1=buy, 0=sell
+  targetChainId: ethers.BigNumberish | undefined // uint64
 }
 
-export type SignedOrder = {
-  id: string // hash of Order (it's not part of order structure in smart-contract)
+export type LockOrder = {
+  user: string // address // адрес юзера который хочет сделать лок
+  sender: string // address // broker
+  expiration: ethers.BigNumberish // uint64
+  asset: string // address(?)
+  amount: ethers.BigNumberish // uint64
+  targetChainId: ethers.BigNumberish // uint64
+  secretHash: string // uint64
+  sign: string // uint64 // подпись юзера
+}
+
+type SignedOrderAdditionalProps = {
   signature: string // bytes
+  secret: string
   needWithdraw?: boolean // bool (not supported yet by smart-contract)
-} & Order
+}
+
+export type SignedOrder = SignedOrderAdditionalProps & Order & {
+  id: string // hash of Order (it's not part of order structure in smart-contract)
+}
+
+export type SignedLockOrder = SignedOrderAdditionalProps & LockOrder
 
 export type CancelOrderRequest = {
   id: number | string
@@ -99,6 +120,8 @@ export enum SupportedChainId {
   // BROKEN = '0',
 }
 
+export type NetworkShortName = Uppercase<typeof networkCodes[number]>;
+
 const balanceTypes = ['exchange', 'wallet'] as const;
 
 export type Source = typeof balanceTypes[number];
@@ -278,22 +301,22 @@ export type EnvConfig = {
   analyticsAPI: string
   referralAPI: string
   networks: Partial<
-    Record<
-      SupportedChainId,
-      VerboseUnitConfig
+        Record<
+            SupportedChainId,
+            VerboseUnitConfig
+        >
     >
-  >
 }
 export type AggregatedAssets = Partial<
-  Record<
-    string,
-    Partial<
-      Record<SupportedChainId, {
-        address: string
-      }>
+    Record<
+        string,
+        Partial<
+            Record<SupportedChainId, {
+              address: string
+            }>
+        >
     >
-  >
-  >;
+>;
 
 export type RedeemOrder = {
   sender: string
@@ -433,9 +456,9 @@ type BridgeHistory = Awaited<ReturnType<typeof getHistory>>;
 type BridgeHistoryItem = NonNullable<BridgeHistory[string]>;
 
 export type AtomicSwap = Partial<
-  Omit<BridgeHistoryItem, 'creationDate' | 'expiration' | 'secret'>
+    Omit<BridgeHistoryItem, 'creationDate' | 'expiration' | 'secret'>
 > & Partial<
-  Omit<AtomicSwapLocal, 'creationDate' | 'expiration' | 'secret'>
+    Omit<AtomicSwapLocal, 'creationDate' | 'expiration' | 'secret'>
 > & {
   sourceChainId: SupportedChainId
   targetChainId: SupportedChainId
diff --git a/src/utils/isUppercasedNetworkCode.ts b/src/utils/isUppercasedNetworkCode.ts
index 978f1cd..2cf2055 100644
--- a/src/utils/isUppercasedNetworkCode.ts
+++ b/src/utils/isUppercasedNetworkCode.ts
@@ -1,7 +1,8 @@
 import { networkCodes } from '../constants/index.js';
 import toUpperCase from './toUpperCase.js';
+import type { NetworkShortName } from '../types';
 
-const isUppercasedNetworkCode = (value: string): value is Uppercase<typeof networkCodes[number]> => networkCodes
+const isUppercasedNetworkCode = (value: string): value is NetworkShortName => networkCodes
   .map(toUpperCase).some((networkCode) => networkCode === value);
 
 export default isUppercasedNetworkCode;