Source-linked reports: Amounts and outcomes come from the original reports and linked replies.
sylwair: nearly $900 of usage in under two days after a project mistake.
@sylwair says a recent project mistake ran up nearly $900 in less than two days. He says he spotted it in Cloudflare's billable-usage view and stopped the abnormal service, and in a reply adds that the daily billing figures appeared with a delay, so the amount did not visibly drop after he stopped it.
What happened
- Reported cause
- Unknown
- Incident date
- Date not recorded
- First reported
- 2026-10-09 12:30 UTC
- Billing outcome
- Not recorded
- Case progress
- Not established
- Public Cloudflare reply
- Not linked
Original sources
Each entry links to the report or reply it describes.
Case timeline
Nearly $900 in under two days
Read on 𝕏Quoting shmily7's case-closed post, the author says a project mistake ran up nearly $900 in under two days, and that he stopped the abnormal service after checking Cloudflare's billable usage.
sylwair
@sylwair · Original 𝕏 post
看到 Cloudflare 最终全额退还真为大佬感到开心，我最近也因为项目失误爆了账单，不到两天时间爆了近900刀，幸亏发现及时，赶紧停掉了异常的服务，这才没有让损失扩大，不敢想如果我没有及时查看 Cloudflare 上的 【可计费使用量】的账单，那对我来说将是一个天文数字。 https://t.co/3cRQfqoh19
Author describes delayed daily figures
Read on 𝕏Replying to another user, the author says the two days were stressful: after he stopped the service, Cloudflare's daily billing figures showed with a delay, so the amount did not visibly drop.
sylwair
@sylwair · Original 𝕏 post
太吓人了，当时人都蒙了。那两天可太煎熬了，停了服务但是由于cloudflare 的每日账单会延时展示，看到金额没有有效下降心惊胆战的
More to read
Cloudflare costs $5 a month, but the bill is not capped
不追高 (@Ariella1213) writes an X article explaining that Workers Paid’s $5 is a minimum, that per-product limits and budget alerts do not cap the account bill, and how denial-of-wallet requests, write amplification, delayed stops and background retries add cost.
mcwangcn reports $1,300 in D1 charges after a bot attack.
@mcwangcn says D1 writes previously cost over a thousand dollars and separately mentions Workers CPU charges without giving an amount. He later shares a Cloudflare bill and says $1,300 of its $3,600 came from D1 after a bot attack.
Budget alerts
Cloudflare documents account-wide spend alerts and their notification limits.