chore: sync submodule state (parent ref update)

Made-with: Cursor

docs/api-guide.md

@@ -470,6 +470,39 @@ graph TD
 
 For detailed recommendations, see [RECOMMENDATIONS.md](./RECOMMENDATIONS.md).
 
+## Exchange Integrations
+
+### Crypto.com OTC 2.0 API
+
+The DBIS Core includes integration with the [Crypto.com Exchange OTC 2.0 REST/WebSocket API](https://exchange-docs.crypto.com/exchange/v1/rest-ws/index_OTC2.html) for institutional OTC trading.
+
+**Module Location:** `src/core/exchange/crypto-com-otc/`
+
+**API Base Path:** `/api/v1/crypto-com-otc`
+
+**Features:**
+- Request-for-Quote (RFQ) via WebSocket
+- Deal execution
+- FX price provider integration (FxService.getMarketPrice uses OTC when available)
+- Settle-later limit and unsettled amount tracking
+- Deal persistence to `otc_trades` table
+- Rate limiting (1 req/s REST, 2 req/s WebSocket)
+- Retry with exponential backoff
+
+**Environment Variables:** `CRYPTO_COM_API_KEY`, `CRYPTO_COM_API_SECRET`, `CRYPTO_COM_ENVIRONMENT` (optional)
+
+**Documentation:** [Crypto.com OTC Module README](../src/core/exchange/crypto-com-otc/README.md) | [DBIS Core API Reference](../../docs/11-references/DBIS_CORE_API_REFERENCE.md)
+
+### Exchange Registry API
+
+**Base Path:** `/api/v1/exchange`
+
+Multi-exchange price aggregation with fallback. Providers: Binance, Kraken (public), Oanda, FXCM (optional API keys).
+
+**Endpoints:** `GET /price?pair=BTC/USD`, `GET /providers`
+
+**Location:** `src/core/exchange/exchange-registry.service.ts`, `exchange.routes.ts`
+
 ---
 
 ## Related Documentation