Blacksmith's 'free trial' billed a startup $1,081 — no credit card on file

A startup using Blacksmith, a YC-backed drop-in replacement for GitHub Actions runners, discovered that the service’s ‘no credit card required’ free trial doesn’t actually stop when you exhaust your free minutes. After ignoring a series of usage warnings — which threatened vague ‘disruptions to your service’ — the team received an invoice for $1,081 that was due immediately, followed by an overdue notice two days later. When pressed, Blacksmith support clarified that ‘disruption’ meant account flagging for review, not job suspension: workflows past the free tier keep running and accrue charges at published rates.

The author argues this is legally defensible but a bad practice. Most users reasonably assume a free tier without payment info is a hard cap — informal polling of chatbots agrees — and silently converting trial usage into invoiced overage mostly benefits abusive users who never intend to pay, while burning goodwill with legitimate ones. He speculates the policy stems from oversight or billing-system debt rather than deliberate growth hacking, noting support eventually offered to ‘mitigate this confusion.’

The kicker: the team will probably keep using Blacksmith anyway, because GitHub Actions remains slow and frustrating enough that the speed gains outweigh the billing grudge. The takeaways — SaaS builders should pause free accounts rather than invoice them in arrears, and Blacksmith trial users should wind down usage before hitting their limit.