{"content":"assist-base-service docs update 2026-07-03\n- Added MVC fee sponsorship integration guide for downstream developers.\n- New file: MVC 手续费代付对接文档.md\n- Documented production base URL: https://www.metaso.network/assist-open-api\n- Clarified workflow: pre -> sign user inputs only -> commit/preview or commit.\n- Clarified txHex must be raw MVC transaction hex, not PSBT.\n- Clarified first input must match address and user tx must already contain at least one input.\n- Captured current +1 sat construction assumption from service implementation for file-onchain flows.\n- Listed common errors and unsupported scenarios.","contentType":"text/plain;utf-8","attachments":[],"quotePin":""}