I work on Enzoguard. It is a SaaS service that gives you stable outbound IP address: https://enzoguard.com
We run a free tier hosted in the US and the free-tier should be sufficient for most developers.
Give it a spin if you would like a stable IP address. We are also working on blocking egress network.
An EU region is in the works, please reach out if you want egress from a specific region or need a dedicated IP address. Cheers!