3 Commits

Author	SHA1	Message	Date
tiennm99	86268341d1	feat: use real BIDV bid/ask rates for forex conversion ... Replace hardcoded 0.5% spread with live buy/sell rates from BIDV bank API. Buying USD uses bank's sell rate (higher), selling USD uses bank's buy rate (lower). Reply shows both rates and actual spread percentage.	2026-04-14 16:53:07 +07:00
tiennm99	f3aaf16d6a	feat: simplify topup to VND-only, add bid/ask spread to convert ... Topup now only accepts VND — users must convert to get other currencies. Convert uses a 0.5% bid/ask spread: buying USD costs more VND (ask), selling USD back gives less VND (bid). Simulates real forex behavior.	2026-04-14 16:06:36 +07:00
tiennm99	c9270764f2	feat: add fake trading module with crypto, stocks, forex and gold ... Paper trading system with 5 commands (trade_topup, trade_buy, trade_sell, trade_convert, trade_stats). Supports VN stocks via TCBS, crypto via CoinGecko, forex via ER-API, and gold via PAX Gold proxy. Per-user portfolio stored in KV with 60s price caching. 54 new tests.	2026-04-14 15:16:53 +07:00