diff --git a/soroban-client/lib/checkin.ts b/soroban-client/lib/checkin.ts
new file mode 100644
index 00000000..57a30f4f
--- /dev/null
+++ b/soroban-client/lib/checkin.ts
@@ -0,0 +1,94 @@
+export interface CheckInParams {
+  organizer: string;
+  eventId: number;
+  tokenId: number;
+}
+
+export interface CheckInResult {
+  success: boolean;
+  timestamp: number;
+  transactionHash: string;
+}
+
+export async function checkInEvent(params: CheckInParams): Promise<CheckInResult> {
+  const EVENT_MANAGER_CONTRACT =
+    process.env.NEXT_PUBLIC_EVENT_MANAGER_CONTRACT || "<MISSING_CONTRACT_ID>";
+  const HORIZON_URL =
+    process.env.NEXT_PUBLIC_HORIZON_URL || "https://horizon-testnet.stellar.org";
+  const NETWORK_PASSPHRASE =
+    process.env.NEXT_PUBLIC_NETWORK_PASSPHRASE || "Test SDF Network ; September 2015";
+
+  if (!EVENT_MANAGER_CONTRACT || EVENT_MANAGER_CONTRACT === "<MISSING_CONTRACT_ID>") {
+    throw new Error(
+      "EVENT_MANAGER_CONTRACT is not configured. Set NEXT_PUBLIC_EVENT_MANAGER_CONTRACT in your env."
+    );
+  }
+
+  const { Server, TransactionBuilder, Operation, Networks } = await import("@stellar/stellar-sdk");
+  const { nativeToScVal } = await import("@stellar/stellar-base");
+  const { signTransaction } = await import("@stellar/freighter-api");
+
+  const server = new Server(HORIZON_URL);
+  const sourceAccount = await server.loadAccount(params.organizer);
+  const fee = await server.fetchBaseFee();
+
+  const args = [
+    nativeToScVal(params.eventId, { type: "u32" }),
+    nativeToScVal(params.tokenId, { type: "u32" }),
+  ];
+
+  const operation = Operation.invokeContractFunction({
+    contract: EVENT_MANAGER_CONTRACT,
+    function: "check_in",
+    args,
+  });
+
+  const tx = new TransactionBuilder(sourceAccount, {
+    fee: fee.toString(),
+    networkPassphrase: NETWORK_PASSPHRASE,
+  })
+    .addOperation(operation)
+    .setTimeout(30)
+    .build();
+
+  const txXdr = tx.toXDR();
+  const { signedTxXdr } = await signTransaction(txXdr, {
+    networkPassphrase: NETWORK_PASSPHRASE,
+    address: params.organizer,
+  });
+
+  const response = await server.submitTransaction(signedTxXdr);
+
+  return {
+    success: true,
+    timestamp: Math.floor(Date.now() / 1000),
+    transactionHash: response.hash,
+  };
+}
+
+export async function verifyCheckIn(
+  eventId: number,
+  tokenId: number
+): Promise<boolean> {
+  const EVENT_MANAGER_CONTRACT =
+    process.env.NEXT_PUBLIC_EVENT_MANAGER_CONTRACT || "<MISSING_CONTRACT_ID>";
+  const HORIZON_URL =
+    process.env.NEXT_PUBLIC_HORIZON_URL || "https://horizon-testnet.stellar.org";
+
+  if (!EVENT_MANAGER_CONTRACT || EVENT_MANAGER_CONTRACT === "<MISSING_CONTRACT_ID>") {
+    throw new Error("EVENT_MANAGER_CONTRACT is not configured");
+  }
+
+  const server = new Server(HORIZON_URL);
+
+  try {
+    const result = await server.getContractEvents({
+      contract: EVENT_MANAGER_CONTRACT,
+      topic: [["check_in", eventId, tokenId]],
+    });
+
+    return result.events.length > 0;
+  } catch {
+    return false;
+  }
+}
\ No newline at end of file
diff --git a/soroban-client/lib/events/websocket.ts b/soroban-client/lib/events/websocket.ts
new file mode 100644
index 00000000..f6d7a631
--- /dev/null
+++ b/soroban-client/lib/events/websocket.ts
@@ -0,0 +1,106 @@
+export interface EventListenerOptions {
+  eventContractId: string;
+  startCursor?: string;
+  onEvent: (event: ContractEvent) => void;
+  onError?: (error: Error) => void;
+}
+
+export interface ContractEvent {
+  id: string;
+  contractId: string;
+  type: string;
+  data: Record<string, unknown>;
+  timestamp: number;
+  cursor: string;
+}
+
+export type ConnectionStatus = "connecting" | "connected" | "disconnecting" | "disconnected" | "error";
+
+export class EventMonitor {
+  private ws: WebSocket | null = null;
+  private status: ConnectionStatus = "disconnected";
+  private reconnectAttempts = 0;
+  private maxReconnectAttempts = 5;
+  private reconnectDelay = 1000;
+  private options: EventListenerOptions | null = null;
+
+  async connect(options: EventListenerOptions): Promise<void> {
+    this.options = options;
+    this.status = "connecting";
+
+    const wsUrl = this.buildWsUrl(options.eventContractId, options.startCursor);
+
+    try {
+      this.ws = new WebSocket(wsUrl);
+
+      this.ws.onopen = () => {
+        this.status = "connected";
+        this.reconnectAttempts = 0;
+      };
+
+      this.ws.onmessage = (event) => {
+        try {
+          const data = JSON.parse(event.data);
+          const contractEvent: ContractEvent = {
+            id: data.id,
+            contractId: data.contractId || options.eventContractId,
+            type: data.type || data.topic || "unknown",
+            data: data.data || {},
+            timestamp: data.timestamp || Date.now(),
+            cursor: data.cursor || "",
+          };
+          options.onEvent(contractEvent);
+        } catch (e) {
+          console.error("Failed to parse WebSocket message:", e);
+        }
+      };
+
+      this.ws.onerror = () => {
+        this.status = "error";
+        options.onError?.(new Error("WebSocket connection error"));
+      };
+
+      this.ws.onclose = () => {
+        this.status = "disconnected";
+        this.attemptReconnect();
+      };
+    } catch (e) {
+      this.status = "error";
+      throw e;
+    }
+  }
+
+  private buildWsUrl(contractId: string, cursor?: string): string {
+    const horizonUrl = process.env.NEXT_PUBLIC_HORIZON_URL || "https://horizon-testnet.stellar.org";
+    const protocol = horizonUrl.includes("testnet") ? "wss" : "wss";
+    return `${protocol}${
+      horizonUrl.replace("https://", "").replace("http://", "")
+    }/events?contractId=${contractId}${cursor ? `&cursor=${cursor}` : ""}`;
+  }
+
+  private attemptReconnect(): void {
+    if (this.options && this.reconnectAttempts < this.maxReconnectAttempts) {
+      this.reconnectAttempts++;
+      setTimeout(() => {
+        this.options && this.connect(this.options);
+      }, this.reconnectDelay * Math.pow(2, this.reconnectAttempts - 1));
+    }
+  }
+
+  disconnect(): void {
+    if (this.ws) {
+      this.status = "disconnecting";
+      this.ws.close();
+      this.ws = null;
+    }
+    this.status = "disconnected";
+  }
+
+  getStatus(): ConnectionStatus {
+    return this.status;
+  }
+}
+
+export function createEventMonitor(): EventMonitor {
+  return new EventMonitor();
+}
\ No newline at end of file
diff --git a/soroban-client/lib/pagination.ts b/soroban-client/lib/pagination.ts
new file mode 100644
index 00000000..3a02160a
--- /dev/null
+++ b/soroban-client/lib/pagination.ts
@@ -0,0 +1,45 @@
+export interface PaginationParams {
+  cursor?: string;
+  limit?: number;
+}
+
+export interface PaginatedResult<T> {
+  data: T[];
+  nextCursor: string | null;
+  hasMore: boolean;
+  total?: number;
+}
+
+export function createPaginationParams(
+  cursor?: string,
+  limit: number = 10
+): PaginationParams {
+  return {
+    cursor,
+    limit: Math.min(Math.max(1, limit), 100),
+  };
+}
+
+export function parsePaginationResponse<T>(
+  data: T[],
+  total?: number
+): PaginatedResult<T> {
+  return {
+    data,
+    nextCursor: data.length > 0 ? encodeCursor(data[data.length - 1]) : null,
+    hasMore: data.length > 0,
+    total,
+  };
+}
+
+function encodeCursor(item: unknown): string {
+  return Buffer.from(JSON.stringify(item)).toString("base64");
+}
+
+export function decodeCursor<T>(cursor: string): T | null {
+  try {
+    return JSON.parse(Buffer.from(cursor, "base64").toString()) as T;
+  } catch {
+    return null;
+  }
+}
\ No newline at end of file
diff --git a/soroban-client/lib/wallet/adapter.ts b/soroban-client/lib/wallet/adapter.ts
new file mode 100644
index 00000000..86cc2cd5
--- /dev/null
+++ b/soroban-client/lib/wallet/adapter.ts
@@ -0,0 +1,18 @@
+export interface WalletAdapter {
+  isConnected: boolean;
+  isInstalled: boolean;
+  address: string | null;
+  connect(): Promise<void>;
+  disconnect(): void;
+  signTransaction(txXdr: string, options?: SignOptions): Promise<string>;
+}
+
+export interface SignOptions {
+  networkPassphrase: string;
+  address: string;
+}
+
+export interface WalletConfig {
+  networkPassphrase: string;
+  horizonUrl: string;
+}
\ No newline at end of file