This wouldn’t have specifically helped in this situation (EC2 reading from S3), but on the general topic of preventing unexpected charges from AWS: AWS just ye

This wouldn’t have specifically helped in this situation (EC2 reading from S3), but on the general topic of preventing unexpected charges from AWS: AWS just yesterday launched flat rate pricing for their CDN (including a flat rate allowance for bandwidth and S3 storage), including a guaranteed $0 tier. It’s just the CDN for now, but hopefully it gets expanded to other services as well. https://news.ycombinator.com/item?id=45975411 https://news.ycombinator.com/item?id=45975411