feat: add stock screener

.gitea/workflows/verify.yml

@@ -4,7 +4,7 @@ on:
   push:
     branches: [develop, main]
   pull_request:
-    types: [opened, synchronize, reopened, edited]
+    types: [opened, synchronize, reopened]
   schedule:
     - cron: '47 5 * * *'
 

src/common/logging/structured-logger.service.spec.ts

@@ -14,6 +14,7 @@ describe('StructuredLogger', () => {
     const logger = new StructuredLogger(pino as never);
 
     logger.info('event', {
+      asOf: '2026-10-10T12:00:00.000Z',
       userId: 'user',
       brokerageAccountId: 'account',
       password: 'secret',
@@ -21,6 +22,7 @@ describe('StructuredLogger', () => {
 
     expect(pino.info).toHaveBeenCalledWith(
       {
+        asOf: '2026-10-10T12:00:00.000Z',
         userId: 'user',
         brokerageAccountId: 'account',
       },

src/common/logging/structured-logger.service.ts

@@ -5,6 +5,7 @@ type LogLevel = 'debug' | 'error' | 'info' | 'warn';
 type LogContext = Record<string, boolean | number | string | undefined>;
 
 const allowedFields = new Set([
+  'asOf',
   'attempts',
   'brokerageAccountId',
   'clientRequestId',

src/integrations/tbank/tbank-access.service.ts

@@ -133,6 +133,18 @@ export class TbankAccessService {
     return this.tokens.decrypt(connection.encryptedToken);
   }
 
+  async current(userId: string): Promise<{ revision: string; token: string }> {
+    const connection = await this.prisma.tbankConnection.findUnique({
+      where: { userId },
+      select: { encryptedToken: true, invalidToken: true, revision: true },
+    });
+    if (!connection) throw new ConflictException({ code: TbankErrorCode.NotConnected });
+    if (connection.invalidToken) {
+      throw new BadRequestException({ code: TbankErrorCode.InvalidToken });
+    }
+    return { revision: connection.revision, token: this.tokens.decrypt(connection.encryptedToken) };
+  }
+
   async publishMembership(
     attempt: TbankSyncAttempt,
     accounts: TbankAccount[],

src/integrations/tbank/tbank-market.types.ts

@@ -8,7 +8,9 @@ import type {
 export type TbankShare = TbankInstrument & {
   apiTradeAvailableFlag?: boolean;
   assetUid?: string;
+  buyAvailableFlag?: boolean;
   classCode?: string;
+  countryOfRisk?: string;
   currency?: string;
   figi?: string;
   first_1dayCandleDate?: TbankTimestamp;

src/integrations/tbank/tbank-protocol.ts

@@ -5,6 +5,10 @@ export enum InstrumentIdType {
   Uid = 'INSTRUMENT_ID_TYPE_UID',
 }
 
+export enum TbankInstrumentStatus {
+  All = 'INSTRUMENT_STATUS_ALL',
+}
+
 export enum TbankInstrumentType {
   Bond = 'INSTRUMENT_TYPE_BOND',
   Share = 'INSTRUMENT_TYPE_SHARE',

src/integrations/tbank/tbank.client.spec.ts

@@ -282,3 +282,141 @@ describe('TbankClient metadata retries', () => {
     expect(jest.getTimerCount()).toBe(0);
   });
 });
+
+describe('TbankClient share catalog', () => {
+  const token = 'token';
+  const catalogSize = 40;
+  let client: TbankClient;
+  let call: jest.Mock;
+  let logger: {
+    event: jest.Mock<void, [string, string, Record<string, number | string>]>;
+  };
+
+  beforeEach(() => {
+    call = jest.fn();
+    logger = {
+      event: jest.fn<void, [string, string, Record<string, number | string>]>(),
+    };
+    client = Object.assign(
+      Object.create(TbankClient.prototype) as TbankClient,
+      { call, logger },
+    );
+  });
+
+  it('fetches the full share catalog through Shares with INSTRUMENT_STATUS_ALL', async () => {
+    const instruments = [{ ticker: 'AFLT', uid: 'uid-aflt' }];
+    call.mockResolvedValue({ instruments });
+
+    await expect(client.getAllShares(token)).resolves.toEqual(instruments);
+    expect(call).toHaveBeenCalledWith('token', undefined, 'shares', {
+      instrumentStatus: 'INSTRUMENT_STATUS_ALL',
+    });
+  });
+
+  it('returns the whole catalog including a fitting instrument beyond the first 30 text matches', async () => {
+    const catalog = Array.from({ length: catalogSize }, (_, index) => {
+      const fitting = index === catalogSize - 1;
+      return {
+        apiTradeAvailableFlag: fitting,
+        buyAvailableFlag: fitting,
+        ticker: fitting ? 'FIT' : `T${index}`,
+        uid: fitting ? 'uid-fit' : `uid-${index}`,
+      };
+    });
+    call.mockResolvedValue({ instruments: catalog });
+
+    const shares = await client.getAllShares(token);
+
+    expect(shares).toEqual(catalog);
+    expect(shares).toHaveLength(catalogSize);
+    expect(shares).toContainEqual({
+      apiTradeAvailableFlag: true,
+      buyAvailableFlag: true,
+      ticker: 'FIT',
+      uid: 'uid-fit',
+    });
+  });
+
+  it('rejects when the source refuses instead of returning an empty success', async () => {
+    const error = new ServiceUnavailableException({
+      code: 'TBANK_UNAVAILABLE',
+    });
+    call.mockRejectedValue(error);
+
+    await expect(client.getAllShares(token)).rejects.toBe(error);
+  });
+
+  it('rejects when the response carries no instrument list', async () => {
+    call.mockResolvedValue({});
+
+    await expect(client.getAllShares(token)).rejects.toBeInstanceOf(
+      ServiceUnavailableException,
+    );
+  });
+
+  it('rejects an empty instrument list with the public unavailable code', async () => {
+    call.mockResolvedValue({ instruments: [] });
+
+    const failure = await client
+      .getAllShares(token)
+      .catch((error: unknown) => error);
+
+    expect(failure).toBeInstanceOf(ServiceUnavailableException);
+    expect((failure as ServiceUnavailableException).getResponse()).toEqual({
+      code: 'TBANK_UNAVAILABLE',
+    });
+  });
+
+  it('rejects a non-list instrument payload as uninterpretable', async () => {
+    call.mockResolvedValue({ instruments: 'corrupted' });
+
+    await expect(client.getAllShares(token)).rejects.toBeInstanceOf(
+      ServiceUnavailableException,
+    );
+  });
+
+  it('rejects an uninterpretable entry without instrument identity', async () => {
+    call.mockResolvedValue({
+      instruments: [
+        { ticker: 'FIT', uid: 'uid-fit' },
+        { ticker: 'BROKEN' },
+      ],
+    });
+
+    await expect(client.getAllShares(token)).rejects.toBeInstanceOf(
+      ServiceUnavailableException,
+    );
+  });
+
+  it('registers asOf and source instrument count on a successful catalog fetch', async () => {
+    call.mockResolvedValue({
+      instruments: [{ uid: 'uid-a' }, { uid: 'uid-b' }],
+    });
+
+    await client.getAllShares(token);
+
+    expect(logger.event).toHaveBeenCalledWith(
+      'info',
+      'tbank.shares.catalog.fetched',
+      expect.objectContaining({ count: 2, operation: 'shares' }),
+    );
+    expect(logger.event.mock.calls[0][2].asOf).toEqual(expect.any(String));
+  });
+
+  it('logs a distinguishable failure without secrets when the catalog is unusable', async () => {
+    call.mockResolvedValue({ instruments: [] });
+
+    await expect(client.getAllShares('secret-token')).rejects.toBeInstanceOf(
+      ServiceUnavailableException,
+    );
+
+    expect(logger.event).toHaveBeenCalledWith(
+      'error',
+      'tbank.shares.catalog.unusable',
+      expect.objectContaining({ operation: 'shares' }),
+    );
+    expect(JSON.stringify(logger.event.mock.calls)).not.toContain(
+      'secret-token',
+    );
+  });
+});

src/integrations/tbank/tbank.client.ts

@@ -34,6 +34,7 @@ import {
   InstrumentIdType,
   TbankAccountStatus,
   TbankCandleInterval,
+  TbankInstrumentStatus,
   TbankInstrumentType,
   TbankOperationState,
 } from './tbank-protocol';
@@ -325,6 +326,35 @@ export class TbankClient {
     ).then((response) => response.instruments ?? []);
   }
 
+  async getAllShares(token: string): Promise<TbankShare[]> {
+    const response = await this.call<{ instruments?: TbankShare[] }>(
+      token,
+      this.instruments,
+      'shares',
+      { instrumentStatus: TbankInstrumentStatus.All },
+    );
+    const { instruments } = response;
+    if (
+      !Array.isArray(instruments) ||
+      !instruments.length ||
+      instruments.some((item) => !item?.uid)
+    ) {
+      this.logger.event('error', 'tbank.shares.catalog.unusable', {
+        code: TbankErrorCode.Unavailable,
+        operation: 'shares',
+      });
+      throw new ServiceUnavailableException({
+        code: TbankErrorCode.Unavailable,
+      });
+    }
+    this.logger.event('info', 'tbank.shares.catalog.fetched', {
+      asOf: new Date().toISOString(),
+      count: instruments.length,
+      operation: 'shares',
+    });
+    return instruments;
+  }
+
   findBonds(token: string, query: string): Promise<TbankBond[]> {
     return this.call<{ instruments?: TbankBond[] }>(
       token,

src/modules/investments/instruments/instruments.module.ts

@@ -1,5 +1,6 @@
 import { Module } from '@nestjs/common';
 
+import { TbankAccessService } from '../../../integrations/tbank/tbank-access.service';
 import { TbankModule } from '../../../integrations/tbank/tbank.module';
 import { AuthModule } from '../../auth/auth.module';
 import { PortfolioModule } from '../portfolio/portfolio.module';
@@ -12,6 +13,7 @@ import { GetStockCompanyUseCase } from './stocks/application/get-stock-company.u
 import { StockCatalogService } from './stocks/application/stock-catalog.service';
 import { StockIncomeService } from './stocks/application/stock-income.service';
 import { StockMarketService } from './stocks/application/stock-market.service';
+import { StockScreenerService } from './stocks/application/stock-screener.service';
 import { StockController } from './stocks/presentation/stock.controller';
 
 @Module({
@@ -19,12 +21,14 @@ import { StockController } from './stocks/presentation/stock.controller';
   controllers: [StockController, BondController],
   exports: [StockIncomeService, BondIncomeService],
   providers: [
+    { provide: 'TBANK_ACCESS', useExisting: TbankAccessService },
     BondIncomeService,
     BondMarketService,
     GetStockCompanyUseCase,
     StockIncomeService,
     StockMarketService,
     StockCatalogService,
+    StockScreenerService,
     BondCatalogService,
   ],
 })

src/modules/investments/instruments/stocks/application/stock-screener.service.spec.ts

@@ -0,0 +1,106 @@
+import { NotFoundException, ServiceUnavailableException } from '@nestjs/common';
+
+import type { TbankShare } from '../../../../../integrations/tbank/tbank.api';
+
+import { StockScreenerService } from './stock-screener.service';
+
+const token = 'secret-token';
+const revision = 'revision-1';
+const pageSize = 30;
+
+function share(index: number, overrides: Partial<TbankShare> = {}): TbankShare {
+  return {
+    apiTradeAvailableFlag: true,
+    buyAvailableFlag: true,
+    currency: 'RUB',
+    lot: 1,
+    name: `Share ${index}`,
+    ticker: `T${String(index).padStart(2, '0')}`,
+    uid: `e6123145-9665-43e0-8413-cd61b8aa${String(index).padStart(4, '0')}`,
+    ...overrides,
+  };
+}
+
+describe('StockScreenerService', () => {
+  const access = { current: jest.fn(), local: jest.fn() };
+  const client = { getAllShares: jest.fn() };
+  const logger = { event: jest.fn() };
+  let service: StockScreenerService;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    access.current.mockResolvedValue({ revision, token });
+    access.local.mockResolvedValue({ revision });
+    client.getAllShares.mockResolvedValue(
+      Array.from({ length: pageSize + 1 }, (_, index) => share(index)),
+    );
+    service = new StockScreenerService(access, client as never, logger as never);
+  });
+
+  it('stores the full selected catalog and returns stable non-overlapping pages', async () => {
+    const first = await service.search('user-1', {});
+    const second = await service.page('user-1', first.searchId, 2);
+
+    expect(first.items).toHaveLength(pageSize);
+    expect(first.hasNext).toBe(true);
+    expect(second).toMatchObject({ asOf: first.asOf, hasNext: false, page: 2, searchId: first.searchId });
+    expect(second.items).toEqual([expect.objectContaining({ ticker: 'T30' })]);
+    expect(client.getAllShares).toHaveBeenCalledTimes(1);
+  });
+
+  it('creates a fresh result for every search and preserves a successful empty result', async () => {
+    client.getAllShares.mockResolvedValueOnce([share(1, { sector: 'energy' })]).mockResolvedValueOnce([share(2, { sector: 'energy' })]);
+
+    const first = await service.search('user-1', { sector: 'finance' });
+    const second = await service.search('user-1', { sector: 'finance' });
+
+    expect(first).toMatchObject({ hasNext: false, items: [], page: 1 });
+    expect(second).toMatchObject({ hasNext: false, items: [], page: 1 });
+    expect(second.searchId).not.toBe(first.searchId);
+    expect(client.getAllShares).toHaveBeenCalledTimes(2);
+  });
+
+  it('does not store a result when the catalog source fails', async () => {
+    client.getAllShares.mockRejectedValueOnce(new ServiceUnavailableException());
+
+    await expect(service.search('user-1', {})).rejects.toBeInstanceOf(ServiceUnavailableException);
+  });
+
+  it('denies missing, foreign, stale, and out-of-range pages without fetching', async () => {
+    const first = await service.search('user-1', {});
+    access.local.mockResolvedValueOnce({ revision: 'revision-2' });
+
+    await expect(service.page('user-1', first.searchId, 1)).rejects.toBeInstanceOf(NotFoundException);
+    await expect(service.page('user-2', first.searchId, 1)).rejects.toBeInstanceOf(NotFoundException);
+    await expect(service.page('user-1', 'missing', 1)).rejects.toBeInstanceOf(NotFoundException);
+    await expect(service.page('user-1', first.searchId, 3)).rejects.toMatchObject({ status: 400 });
+    expect(client.getAllShares).toHaveBeenCalledTimes(1);
+  });
+
+  it('null-normalizes optional source fields and rejects malformed required fields', async () => {
+    client.getAllShares.mockResolvedValueOnce([
+      share(1, {
+        countryOfRisk: undefined,
+        currency: undefined,
+        isin: undefined,
+        realExchange: undefined,
+        sector: undefined,
+        shareType: undefined,
+        ticker: undefined,
+      }),
+    ]);
+    const result = await service.search('user-1', {});
+    expect(result.items[0]).toEqual(expect.objectContaining({ countryOfRisk: null, currency: null, isin: null, logoName: null, ticker: null }));
+
+    client.getAllShares.mockResolvedValueOnce([share(2, { name: ' ' })]);
+    await expect(service.search('user-1', {})).rejects.toBeInstanceOf(ServiceUnavailableException);
+  });
+
+  it('preserves the catalog logo name in screener results', async () => {
+    client.getAllShares.mockResolvedValueOnce([share(1, { brand: { logoName: 'sber.png' } })]);
+
+    const result = await service.search('user-1', {});
+
+    expect(result.items).toEqual([expect.objectContaining({ logoName: 'sber.png' })]);
+  });
+});

src/modules/investments/instruments/stocks/application/stock-screener.service.ts

@@ -0,0 +1,140 @@
+import {
+  BadRequestException,
+  Inject,
+  Injectable,
+  NotFoundException,
+  ServiceUnavailableException,
+} from '@nestjs/common';
+import { randomUUID } from 'node:crypto';
+
+import type { TbankShare } from '../../../../../integrations/tbank/tbank-market.types';
+
+import { StructuredLogger } from '../../../../../common/logging/structured-logger.service';
+import { TbankClient } from '../../../../../integrations/tbank/tbank.client';
+import {
+  selectStockScreenerInstruments,
+  type StockScreenerConditions,
+} from '../domain/stock-screener-selection.rules';
+
+const MAX_SNAPSHOTS = 100;
+const PAGE_SIZE = 30;
+const MIN_PAGE = 1;
+const MINIMUM_SNAPSHOT_COUNT = 1;
+const SECONDS_PER_MINUTE = 60;
+const SNAPSHOT_TTL_MINUTES = 5;
+const MILLISECONDS_PER_SECOND = 1_000;
+const SNAPSHOT_TTL_MS = SNAPSHOT_TTL_MINUTES * SECONDS_PER_MINUTE * MILLISECONDS_PER_SECOND;
+const UUID_PATTERN = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
+
+type StockScreenerItem = {
+  countryOfRisk: null | string;
+  currency: null | string;
+  instrumentUid: string;
+  isin: null | string;
+  logoName: null | string;
+  lot: null | number;
+  name: string;
+  realExchange: null | string;
+  sector: null | string;
+  shareType: null | string;
+  ticker: null | string;
+};
+type StockScreenerPage = {
+  asOf: string;
+  hasNext: boolean;
+  items: StockScreenerItem[];
+  page: number;
+  searchId: string;
+};
+type Snapshot = { asOf: string; expiresAt: number; items: StockScreenerItem[]; revision: string; userId: string };
+type TbankAccess = {
+  current(userId: string): Promise<{ revision: string; token: string }>;
+  local(userId: string): Promise<{ revision: string }>;
+};
+
+@Injectable()
+export class StockScreenerService {
+  private readonly snapshots = new Map<string, Snapshot>();
+
+  constructor(
+    @Inject('TBANK_ACCESS') private readonly access: TbankAccess,
+    private readonly client: TbankClient,
+    private readonly logger: StructuredLogger,
+  ) {}
+
+  async search(userId: string, conditions: StockScreenerConditions): Promise<StockScreenerPage> {
+    const connection = await this.access.current(userId);
+    const instruments = await this.client.getAllShares(connection.token);
+    const asOf = new Date().toISOString();
+    const selected = selectStockScreenerInstruments({ asOf: new Date(asOf), instruments }, conditions)
+      .instruments.map((instrument) => this.item(instrument));
+    const searchId = randomUUID();
+    this.evict();
+    this.snapshots.set(searchId, {
+      asOf,
+      expiresAt: Date.now() + SNAPSHOT_TTL_MS,
+      items: selected,
+      revision: connection.revision,
+      userId,
+    });
+    this.logger.event('info', 'stock.screener.search.completed', { asOf, count: selected.length, operation: 'stock-screener-search' });
+    return this.result(searchId, this.snapshots.get(searchId) as Snapshot, MIN_PAGE);
+  }
+
+  async page(userId: string, searchId: string, page: number): Promise<StockScreenerPage> {
+    const snapshot = this.snapshots.get(searchId);
+    if (!snapshot || snapshot.expiresAt <= Date.now()) {
+      this.snapshots.delete(searchId);
+      this.logger.event('info', 'stock.screener.result.missing', { operation: 'stock-screener-read' });
+      throw new NotFoundException();
+    }
+    if (snapshot.userId !== userId) {
+      this.logger.event('warn', 'stock.screener.result.rejected', { operation: 'stock-screener-read' });
+      throw new NotFoundException();
+    }
+    const current = await this.access.local(userId);
+    if (snapshot.revision !== current.revision) {
+      this.logger.event('warn', 'stock.screener.result.rejected', { operation: 'stock-screener-read' });
+      throw new NotFoundException();
+    }
+    return this.result(searchId, snapshot, page);
+  }
+
+  private result(searchId: string, snapshot: Snapshot, page: number): StockScreenerPage {
+    const start = (page - MIN_PAGE) * PAGE_SIZE;
+    if (!Number.isInteger(page) || page < MIN_PAGE || (start >= snapshot.items.length && !(page === MIN_PAGE && !snapshot.items.length))) {
+      throw new BadRequestException();
+    }
+    const items = snapshot.items.slice(start, start + PAGE_SIZE);
+    return { asOf: snapshot.asOf, hasNext: start + PAGE_SIZE < snapshot.items.length, items, page, searchId };
+  }
+
+  private item(instrument: TbankShare): StockScreenerItem {
+    if (!instrument.uid || !UUID_PATTERN.test(instrument.uid) || !instrument.name?.trim()) {
+      throw new ServiceUnavailableException();
+    }
+    return {
+      countryOfRisk: instrument.countryOfRisk ?? null,
+      currency: instrument.currency ?? null,
+      instrumentUid: instrument.uid,
+      isin: instrument.isin ?? null,
+      lot: instrument.lot ?? null,
+      logoName: instrument.brand?.logoName?.trim() || null,
+      name: instrument.name,
+      realExchange: instrument.realExchange ?? null,
+      sector: instrument.sector ?? null,
+      shareType: instrument.shareType ?? null,
+      ticker: instrument.ticker ?? null,
+    };
+  }
+
+  private evict(): void {
+    for (const [searchId, snapshot] of this.snapshots) {
+      if (snapshot.expiresAt <= Date.now()) this.snapshots.delete(searchId);
+    }
+    while (this.snapshots.size >= MAX_SNAPSHOTS) {
+      const searchId = this.snapshots.keys().next().value;
+      if (searchId && this.snapshots.size >= MINIMUM_SNAPSHOT_COUNT) this.snapshots.delete(searchId);
+    }
+  }
+}

src/modules/investments/instruments/stocks/domain/stock-screener-selection.rules.spec.ts

@@ -0,0 +1,188 @@
+import type { TbankShare } from '../../../../../integrations/tbank/tbank.api';
+
+import { selectStockScreenerInstruments } from './stock-screener-selection.rules';
+
+const asOf = new Date('2026-10-10T12:00:00.000Z');
+
+function share(overrides: Partial<TbankShare> = {}): TbankShare {
+  return {
+    apiTradeAvailableFlag: true,
+    buyAvailableFlag: true,
+    currency: 'RUB',
+    lot: 10,
+    name: 'North Star',
+    ticker: 'NSTR',
+    uid: 'uid-1',
+    ...overrides,
+  };
+}
+
+describe('selectStockScreenerInstruments', () => {
+  it('keeps only instruments matching every selected condition', () => {
+    const result = selectStockScreenerInstruments(
+      {
+        asOf,
+        instruments: [
+          share({ isin: 'A', sector: 'energy' }),
+          share({ currency: 'USD', isin: 'B', sector: 'energy', uid: 'uid-2' }),
+          share({ isin: 'C', name: 'Other', sector: 'energy', uid: 'uid-3' }),
+          share({ isin: 'D', sector: 'finance', uid: 'uid-4' }),
+        ],
+      },
+      { currency: 'RUB', query: 'star', sector: 'energy' },
+    );
+
+    expect(result).toEqual({ asOf, instruments: [share({ isin: 'A', sector: 'energy' })] });
+  });
+
+  it.each([
+    ['sector', { sector: 'energy' }, share({ sector: undefined })],
+    ['share type', { shareType: 'common' }, share({ shareType: 'preferred' })],
+    ['currency', { currency: 'USD' }, share({ currency: undefined })],
+    ['exchange', { realExchange: 'MOEX' }, share({ realExchange: undefined })],
+    ['country of risk', { countryOfRisk: 'RU' }, share({ countryOfRisk: 'US' })],
+    ['query', { query: 'star' }, share({ name: undefined, ticker: undefined })],
+  ] as const)('excludes an unknown or unequal selected %s', (_condition, conditions, instrument) => {
+    const result = selectStockScreenerInstruments(
+      { asOf, instruments: [instrument] },
+      conditions,
+    );
+
+    expect(result.instruments).toEqual([]);
+  });
+
+  it('uses an inclusive maximum lot and ignores lots when it is not selected', () => {
+    const instruments = [
+      share({ isin: 'equal', lot: 10, uid: 'equal' }),
+      share({ isin: 'large', lot: 11, uid: 'large' }),
+      share({ isin: 'unknown', lot: undefined, uid: 'unknown' }),
+      share({ isin: 'zero', lot: 0, uid: 'zero' }),
+    ];
+
+    expect(
+      selectStockScreenerInstruments({ asOf, instruments }, { maxLot: 10 }).instruments.map(
+        ({ uid }) => uid,
+      ),
+    ).toEqual(['equal']);
+    expect(
+      selectStockScreenerInstruments({ asOf, instruments }, {}).instruments.map(({ uid }) => uid),
+    ).toEqual(['equal', 'large', 'unknown', 'zero']);
+  });
+
+  it('chooses the smallest matching uid as the complete representative of an ISIN', () => {
+    const chosen = share({ isin: ' same ', lot: 1, name: 'Chosen', uid: 'a' });
+    const result = selectStockScreenerInstruments(
+      {
+        asOf,
+        instruments: [share({ isin: 'SAME', lot: 99, name: 'Sibling', uid: 'z' }), chosen],
+      },
+      {},
+    );
+
+    expect(result.instruments).toEqual([chosen]);
+    expect(result.instruments[0]).toMatchObject({ lot: 1, name: 'Chosen', uid: 'a' });
+  });
+
+  it('chooses the sole matching mode of an issue', () => {
+    const matching = share({ isin: 'same', sector: 'energy', uid: 'matching' });
+    const result = selectStockScreenerInstruments(
+      {
+        asOf,
+        instruments: [share({ isin: 'same', sector: 'finance', uid: 'smaller-uid' }), matching],
+      },
+      { sector: 'energy' },
+    );
+
+    expect(result.instruments).toEqual([matching]);
+  });
+
+  it('keeps different ISIN issues from one issuer separate', () => {
+    const result = selectStockScreenerInstruments(
+      {
+        asOf,
+        instruments: [
+          share({ isin: 'common', shareType: 'common', uid: 'common' }),
+          share({ isin: 'preferred', shareType: 'preferred', uid: 'preferred' }),
+        ],
+      },
+      {},
+    );
+
+    expect(result.instruments.map(({ uid }) => uid)).toEqual(['common', 'preferred']);
+  });
+
+  it('treats instruments without an ISIN as separate issues', () => {
+    const result = selectStockScreenerInstruments(
+      {
+        asOf,
+        instruments: [share({ isin: ' ', uid: 'first' }), share({ isin: undefined, uid: 'second' })],
+      },
+      {},
+    );
+
+    expect(result.instruments.map(({ uid }) => uid)).toEqual(['first', 'second']);
+  });
+
+  it('preserves exact whitespace-differing UIDs as separate blank-ISIN issues', () => {
+    const result = selectStockScreenerInstruments(
+      {
+        asOf,
+        instruments: [
+          share({ isin: ' ', uid: 'uid' }),
+          share({ isin: undefined, uid: ' uid ' }),
+        ],
+      },
+      {},
+    );
+
+    expect(result.instruments.map(({ uid }) => uid)).toEqual([' uid ', 'uid']);
+  });
+
+  it('returns the exact chosen uid for the later card link', () => {
+    const result = selectStockScreenerInstruments(
+      {
+        asOf,
+        instruments: [share({ isin: 'same', uid: 'sibling' }), share({ isin: 'SAME', uid: 'chosen' })],
+      },
+      {},
+    );
+
+    expect(result.instruments[0]?.uid).toBe('chosen');
+  });
+
+  it.each([
+    [true, true, 1],
+    [true, false, 0],
+    [false, true, 0],
+    [false, false, 0],
+    [true, undefined, 0],
+    [undefined, true, 0],
+  ] as const)(
+    'includes only confirmed buy and API availability: buy=%s api=%s',
+    (buyAvailableFlag, apiTradeAvailableFlag, expectedCount) => {
+      const result = selectStockScreenerInstruments(
+        { asOf, instruments: [share({ apiTradeAvailableFlag, buyAvailableFlag })] },
+        {},
+      );
+
+      expect(result.instruments).toHaveLength(expectedCount);
+    },
+  );
+
+  it('orders representatives by ticker and then uid before paging', () => {
+    const result = selectStockScreenerInstruments(
+      {
+        asOf,
+        instruments: [
+          share({ isin: 'c', ticker: 'B', uid: 'z' }),
+          share({ isin: 'a', ticker: 'A', uid: 'z' }),
+          share({ isin: 'b', ticker: 'A', uid: 'a' }),
+          share({ isin: 'empty', ticker: ' ', uid: 'empty' }),
+        ],
+      },
+      {},
+    );
+
+    expect(result.instruments.map(({ uid }) => uid)).toEqual(['empty', 'a', 'z', 'z']);
+  });
+});

src/modules/investments/instruments/stocks/domain/stock-screener-selection.rules.ts

@@ -0,0 +1,106 @@
+import type { TbankShare } from '../../../../../integrations/tbank/tbank.api';
+
+export type StockScreenerCatalog = {
+  asOf: Date;
+  instruments: TbankShare[];
+};
+
+export type StockScreenerConditions = {
+  countryOfRisk?: string;
+  currency?: string;
+  maxLot?: number;
+  query?: string;
+  realExchange?: string;
+  sector?: string;
+  shareType?: string;
+};
+
+type IdentifiedShare = TbankShare & { uid: string };
+const sortBefore = 0;
+
+export function selectStockScreenerInstruments(
+  catalog: StockScreenerCatalog,
+  conditions: StockScreenerConditions,
+): StockScreenerCatalog {
+  const representatives = new Map<string, IdentifiedShare>();
+
+  for (const instrument of catalog.instruments) {
+    if (!matches(instrument, conditions)) continue;
+
+    const { uid } = instrument;
+    const isin = instrument.isin?.trim().toUpperCase();
+    const issueKey = isin ? `isin:${isin}` : `uid:${uid}`;
+    const existing = representatives.get(issueKey);
+    if (!existing || uid.localeCompare(existing.uid) < sortBefore) {
+      representatives.set(issueKey, instrument);
+    }
+  }
+
+  return {
+    asOf: catalog.asOf,
+    instruments: [...representatives.values()].sort(
+      (left, right) =>
+        (left.ticker?.trim() ?? '').localeCompare(right.ticker?.trim() ?? '') ||
+        left.uid.localeCompare(right.uid),
+    ),
+  };
+}
+
+function matches(
+  instrument: TbankShare,
+  conditions: StockScreenerConditions,
+): instrument is IdentifiedShare {
+  if (
+    !instrument.uid?.trim() ||
+    instrument.buyAvailableFlag !== true ||
+    instrument.apiTradeAvailableFlag !== true
+  ) {
+    return false;
+  }
+
+  if (
+    conditions.query !== undefined &&
+    !`${instrument.name ?? ''}\n${instrument.ticker ?? ''}`
+      .toLowerCase()
+      .includes(conditions.query.toLowerCase())
+  ) {
+    return false;
+  }
+
+  if (conditions.sector !== undefined && instrument.sector !== conditions.sector) {
+    return false;
+  }
+  if (
+    conditions.shareType !== undefined &&
+    instrument.shareType !== conditions.shareType
+  ) {
+    return false;
+  }
+  if (
+    conditions.currency !== undefined &&
+    instrument.currency !== conditions.currency
+  ) {
+    return false;
+  }
+  if (
+    conditions.realExchange !== undefined &&
+    instrument.realExchange !== conditions.realExchange
+  ) {
+    return false;
+  }
+  if (
+    conditions.countryOfRisk !== undefined &&
+    instrument.countryOfRisk !== conditions.countryOfRisk
+  ) {
+    return false;
+  }
+
+  const minimumPositiveLot = 0;
+  return (
+    conditions.maxLot === undefined ||
+    (Number.isInteger(instrument.lot) &&
+      instrument.lot !== undefined &&
+      instrument.lot > minimumPositiveLot &&
+      instrument.lot <= conditions.maxLot)
+  );
+}

src/modules/investments/instruments/stocks/presentation/stock.controller.ts

@@ -1,15 +1,21 @@
 import type { Request } from 'express';
 
 import {
+  BadRequestException,
+  Body,
   Controller,
   Get,
+  HttpCode,
+  HttpStatus,
   Param,
   ParseUUIDPipe,
+  Post,
   Query,
   Req,
   UseGuards,
+  ValidationPipe,
 } from '@nestjs/common';
-import { ApiBearerAuth, ApiOkResponse, ApiTags } from '@nestjs/swagger';
+import { ApiBearerAuth, ApiOkResponse, ApiOperation, ApiTags } from '@nestjs/swagger';
 
 import { ApiProblemResponses } from '../../../../../common/decorators/api-safe-error-response.decorator';
 import { AccessPayload, JwtAuthGuard } from '../../../../auth/auth.api';
@@ -18,6 +24,7 @@ import { GetStockCompanyUseCase } from '../application/get-stock-company.use-cas
 import { StockCatalogService } from '../application/stock-catalog.service';
 import { StockIncomeService } from '../application/stock-income.service';
 import { StockMarketService } from '../application/stock-market.service';
+import { StockScreenerService } from '../application/stock-screener.service';
 import {
   StockCandlesQueryDto,
   StockCandlesResourceDto,
@@ -26,6 +33,9 @@ import {
   StockPositionResourceDto,
   StockQuoteResourceDto,
   StockResourceDto,
+  StockScreenerCriteriaDto,
+  StockScreenerPageDto,
+  StockScreenerPageQueryDto,
   StockSearchQueryDto,
   StockSearchResourceDto,
   StockTickerParamsDto,
@@ -42,6 +52,7 @@ export class StockController {
     private readonly market: StockMarketService,
     private readonly income: StockIncomeService,
     private readonly companyInfo: GetStockCompanyUseCase,
+    private readonly screener: StockScreenerService,
   ) {}
 
   @Get()
@@ -71,6 +82,33 @@ export class StockController {
     );
   }
 
+  @Post('screener/search')
+  @HttpCode(HttpStatus.OK)
+  @ApiOperation({ operationId: 'createStockScreenerSearch' })
+  @ApiOkResponse({ type: StockScreenerPageDto })
+  searchScreener(
+    @Req() request: Request & { user: AccessPayload },
+    @Body(new ValidationPipe({ forbidNonWhitelisted: true, forbidUnknownValues: true, whitelist: true }))
+    criteria: StockScreenerCriteriaDto,
+  ) {
+    const allowed = new Set(['countryOfRisk', 'currency', 'maxLot', 'query', 'realExchange', 'sector', 'shareType']);
+    if (Object.keys(request.body as object).some((key) => !allowed.has(key))) {
+      throw new BadRequestException();
+    }
+    return this.screener.search(request.user.sub, criteria);
+  }
+
+  @Get('screener/search/:searchId')
+  @ApiOperation({ operationId: 'readStockScreenerPage' })
+  @ApiOkResponse({ type: StockScreenerPageDto })
+  pageScreener(
+    @Req() request: Request & { user: AccessPayload },
+    @Param('searchId') searchId: string,
+    @Query() query: StockScreenerPageQueryDto,
+  ) {
+    return this.screener.page(request.user.sub, searchId, query.page);
+  }
+
   @Get(':uid')
   @ApiOkResponse({ type: StockResourceDto })
   get(

src/modules/investments/instruments/stocks/presentation/stock.dto.ts

@@ -2,10 +2,12 @@ import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
 import { Transform } from 'class-transformer';
 import {
   IsIn,
+  IsInt,
   IsOptional,
   IsString,
   Matches,
   MaxLength,
+  Min,
   MinLength,
 } from 'class-validator';
 
@@ -21,6 +23,86 @@ import {
 import { PortfolioPositionDto } from '../../../portfolio/portfolio.api';
 
 const MIN_TICKER_LENGTH = 1;
+const MAX_SCREENER_QUERY_LENGTH = 80;
+const MIN_PAGE = 1;
+
+export class StockScreenerCriteriaDto {
+  @ApiPropertyOptional({ maxLength: MAX_SCREENER_QUERY_LENGTH })
+  @Transform(({ value }: { value: unknown }) =>
+    value === '' ? undefined : value,
+  )
+  @IsOptional()
+  @IsString()
+  @MinLength(MIN_TICKER_LENGTH)
+  @MaxLength(MAX_SCREENER_QUERY_LENGTH)
+  query?: string;
+
+  @ApiPropertyOptional({ minLength: MIN_TICKER_LENGTH })
+  @IsOptional()
+  @IsString()
+  @MinLength(MIN_TICKER_LENGTH)
+  sector?: string;
+
+  @ApiPropertyOptional({ minLength: MIN_TICKER_LENGTH })
+  @IsOptional()
+  @IsString()
+  @MinLength(MIN_TICKER_LENGTH)
+  shareType?: string;
+
+  @ApiPropertyOptional({ minLength: MIN_TICKER_LENGTH })
+  @IsOptional()
+  @IsString()
+  @MinLength(MIN_TICKER_LENGTH)
+  currency?: string;
+
+  @ApiPropertyOptional({ minLength: MIN_TICKER_LENGTH })
+  @IsOptional()
+  @IsString()
+  @MinLength(MIN_TICKER_LENGTH)
+  realExchange?: string;
+
+  @ApiPropertyOptional({ minLength: MIN_TICKER_LENGTH })
+  @IsOptional()
+  @IsString()
+  @MinLength(MIN_TICKER_LENGTH)
+  countryOfRisk?: string;
+
+  @ApiPropertyOptional({ minimum: MIN_TICKER_LENGTH, type: 'integer' })
+  @IsOptional()
+  @IsInt()
+  @Min(MIN_TICKER_LENGTH)
+  maxLot?: number;
+}
+
+export class StockScreenerPageQueryDto {
+  @ApiProperty({ minimum: MIN_PAGE, type: 'integer' })
+  @Transform(({ value }: { value: unknown }) => Number(value))
+  @IsInt()
+  @Min(MIN_PAGE)
+  declare page: number;
+}
+
+export class StockScreenerItemDto {
+  @ApiProperty({ format: 'uuid' }) declare instrumentUid: string;
+  @ApiProperty() declare name: string;
+  @ApiProperty({ nullable: true, type: String }) declare ticker: null | string;
+  @ApiProperty({ nullable: true, type: String }) declare isin: null | string;
+  @ApiProperty({ nullable: true, type: String }) declare logoName: null | string;
+  @ApiProperty({ nullable: true, type: String }) declare shareType: null | string;
+  @ApiProperty({ nullable: true, type: String }) declare sector: null | string;
+  @ApiProperty({ nullable: true, type: String }) declare currency: null | string;
+  @ApiProperty({ nullable: true, type: String }) declare realExchange: null | string;
+  @ApiProperty({ nullable: true, type: String }) declare countryOfRisk: null | string;
+  @ApiProperty({ nullable: true, type: 'integer' }) declare lot: null | number;
+}
+
+export class StockScreenerPageDto {
+  @ApiProperty() declare searchId: string;
+  @ApiProperty({ format: 'date-time' }) declare asOf: string;
+  @ApiProperty({ minimum: MIN_PAGE, type: 'integer' }) declare page: number;
+  @ApiProperty() declare hasNext: boolean;
+  @ApiProperty({ type: StockScreenerItemDto, isArray: true, maxItems: 30 }) declare items: StockScreenerItemDto[];
+}
 
 export class StockSearchQueryDto extends InvestmentReadQueryDto {
   @ApiProperty({ minLength: MIN_INSTRUMENT_QUERY_LENGTH, maxLength: MAX_INSTRUMENT_QUERY_LENGTH })

test/stocks.e2e-spec.ts

@@ -15,6 +15,7 @@ import { configureApp } from '../src/main';
 import { StockCatalogService } from '../src/modules/investments/instruments/stocks/application/stock-catalog.service';
 import { StockIncomeService } from '../src/modules/investments/instruments/stocks/application/stock-income.service';
 import { StockMarketService } from '../src/modules/investments/instruments/stocks/application/stock-market.service';
+import { StockScreenerService } from '../src/modules/investments/instruments/stocks/application/stock-screener.service';
 
 const uid = 'e6123145-9665-43e0-8413-cd61b8aa9b13';
 describe('Stock HTTP contract', () => {
@@ -25,6 +26,7 @@ describe('Stock HTTP contract', () => {
     search: jest.fn(),
     candles: jest.fn(),
   };
+  const screener = { page: jest.fn(), search: jest.fn() };
   const token = new JwtService().sign(
     { sub: 'stock-reader', type: 'access' },
     { secret: process.env.JWT_SECRET },
@@ -37,6 +39,8 @@ describe('Stock HTTP contract', () => {
       .useValue(stocks)
       .overrideProvider(StockIncomeService)
       .useValue(stocks)
+      .overrideProvider(StockScreenerService)
+      .useValue(screener)
       .compile();
     app = module.createNestApplication();
     configureApp(app);
@@ -51,12 +55,55 @@ describe('Stock HTTP contract', () => {
     });
     stocks.search.mockResolvedValue([]);
     stocks.getByTicker.mockResolvedValue({ instrumentUid: uid, slug: 'SBERP' });
+    screener.search.mockResolvedValue({ asOf: '2026-10-10T12:00:00.000Z', hasNext: false, items: [], page: 1, searchId: 'search-id' });
   });
   afterAll(() => app.close());
   it('requires authentication before invoking the use case', async () => {
     await request(app.getHttpServer()).get(`/api/v1/stocks/${uid}`).expect(401);
     expect(stocks.get).not.toHaveBeenCalled();
   });
+  it.each([
+    [() => request(app.getHttpServer()).post('/api/v1/stocks/screener/search'), 'post'],
+    [() => request(app.getHttpServer()).get('/api/v1/stocks/screener/search/search-id?page=1'), 'get'],
+  ])('requires authentication for screener route', async (send) => {
+    await send().expect(401);
+    expect(screener.search).not.toHaveBeenCalled();
+    expect(screener.page).not.toHaveBeenCalled();
+  });
+  it('validates screener input and returns raw snapshot pages', async () => {
+    await request(app.getHttpServer())
+      .post('/api/v1/stocks/screener/search')
+      .set('Authorization', `Bearer ${token}`)
+      .send({ query: ' ', unknown: 'value' })
+      .expect(400);
+    expect(screener.search).not.toHaveBeenCalled();
+
+    const response = await request(app.getHttpServer())
+      .post('/api/v1/stocks/screener/search')
+      .set('Authorization', `Bearer ${token}`)
+      .send({ query: '' })
+      .expect(200);
+    expect(response.body).toEqual({ asOf: '2026-10-10T12:00:00.000Z', hasNext: false, items: [], page: 1, searchId: 'search-id' });
+    expect(screener.search).toHaveBeenCalledWith('stock-reader', {});
+  });
+  it.each([
+    '/api/v1/stocks/screener/search/search-id',
+    '/api/v1/stocks/screener/search/search-id?page=0',
+    '/api/v1/stocks/screener/search/search-id?page=one',
+  ])('validates required screener page on %s', async (path) => {
+    await request(app.getHttpServer())
+      .get(path)
+      .set('Authorization', `Bearer ${token}`)
+      .expect(400);
+    expect(screener.page).not.toHaveBeenCalled();
+  });
+  it('reads a screener snapshot page with the verified identity', async () => {
+    await request(app.getHttpServer())
+      .get('/api/v1/stocks/screener/search/search-id?page=2')
+      .set('Authorization', `Bearer ${token}`)
+      .expect(200);
+    expect(screener.page).toHaveBeenCalledWith('stock-reader', 'search-id', 2);
+  });
   it.each([
     '/stocks/not-a-uid',
     '/stocks/by-ticker/%20',