aws-sns

On 18 Sep 2026 SNS raised the payload ceiling to 1 MiB, four times 256 KiB, but only after you set MaximumMessageSize. A full 1 MiB Standard publish is 16 requests. At 50 cents per million requests, one million of those publishes cost 8 dollars before the free tier.

SNS bills publish and delivery separately. Standard topic publish is $0.50/M, but HTTP delivery is $0.60/M on top, email is $2/100K, SMS varies by country, and mobile push is $0.50/M. A single publish to a topic fanned out to four protocols generates four billable lines — five if you count the cross-region data transfer.