4xx Client errors
402 Payment Required
Reserved for payment; some APIs use it when a plan limit or payment is due.
Common causes
- An API account is out of credit or over its plan.
How to fix it
- Check billing or the plan on the service's dashboard.
Find out the moment your site returns 402
Spot Downtime monitors count this as down and alert you, since visitors see an error. (The public “Is it down?” checker treats 4xx answers from big sites as online, because many refuse automated requests.)