YunDou is one of the visible providers in the RelayRank monitoring pool. The latest sample shows 100% availability, 1995 ms average latency, and status up.
This review is not a top-up recommendation. It turns monitoring data into practical signals for Claude Code, OpenAI/Codex, and Gemini relay users.
Stability view
YunDou: 100% availability, 1995 ms average latency, current status up. For long coding sessions, sustained availability matters more than a single latency number.
Run a 20 to 30 minute task before treating any relay as your primary endpoint.
Best fit
YunDou is better treated as a shortlist candidate first. It fits users who keep backup providers and test with small balances before scaling usage.
Missing pricing clarity, refund rules, model limits, or status communication should reduce trust.
Verdict
YunDou can enter the testing shortlist, but primary usage still depends on your own models, billing path, and sustained task results.