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**Problem 1 — Current price always 0** get_orderbook() used inquire-asking-price-exp-ccn which has no stck_prpr in output1 (only askp/bidp data). This caused every domestic BUY to be skipped with "no affordable quantity (cash=..., price=0.00)". **Problem 2 — KRX tick unit error on limit orders** Limit order prices were passed unrounded, triggering 호가단위 오류 in VTS. Also ORD_DVSN was wrongly set to "01" (시장가) for limit orders. **Fix** - Add kr_tick_unit(price) and kr_round_down(price) module-level helpers implementing KRX 7-tier price tick rules (1/5/10/50/100/500/1000원). - Add get_current_price(stock_code) → (price, change_pct, foreigner_net) using FHKST01010100 / inquire-price API (works in VTS, returns correct stck_prpr, prdy_ctrt, frgn_ntby_qty). - Fix send_order() ORD_DVSN: "00"=지정가, "01"=시장가 (was "01"/"06"). - Apply kr_round_down() to limit order price inside send_order(). - Replace both get_orderbook() calls in main.py with get_current_price(). - Update all 4 test_main.py mock sites to use get_current_price AsyncMock. **Tests added** (25 new tests, all 646 pass) - TestKrTickUnit: 13 parametrized boundary cases + 7 round-down cases - TestGetCurrentPrice: correct fields, correct API path/TR_ID, HTTP error - TestSendOrderTickRounding: tick rounding, ORD_DVSN 00/01 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>