The Real Cost of Static IPs: NAT Gateway vs. Proxy Service vs. Rolling Your Own

At some point, a partner or vendor says "your application needs to come from a static IP." That's when the infrastructure decision starts. AWS NAT Gateway is the obvious answer, but it's not always the right one.

Here's what each option actually costs and when each makes sense.

The AWS NAT Gateway Math

NAT Gateway pricing in US East (N. Virginia):

• $0.045 per hour per availability zone
• $0.045 per gigabyte of data processed
• That's roughly $32.40 per month per AZ (730 hours × $0.045)

A production setup needs at least two AZs for high availability. That's $64.80 per month minimum. Before you process a single byte of data.

Add data transfer. A Lambda function making 10,000 API calls per day at 50KB per call processes about 500GB per month. At $0.045 per GB, that's another $22.50.

For moderate traffic: $85-120 per month. For heavier workloads (5-10TB monthly), $300-500. And you need this for every AZ where you need outbound traffic.

The Alternatives

Option 1: Static IP Proxy Service (QuotaGuard Static)

Cost: $19-69 per month

Two load-balanced static IPs for $19/month. You route specific traffic through the proxy. No infrastructure to manage. No failover to configure. Automatic failover between the two IPs. 500GB monthly bandwidth on the base plan.

The trade-off: you're only routing traffic that specifically needs a static IP. Everything else goes directly out. For most teams, that's exactly what they need.

If you need compliance-level encryption, QuotaGuard Shield starts at $69/month and adds SSL passthrough for regulated workloads.

Option 2: Roll Your Own on EC2 or DigitalOcean

Cost: $5-20 per month (infrastructure) + your time

You can run a Squid proxy or similar on a small EC2 instance ($9/month for t3.micro) or DigitalOcean droplet ($5-6/month). Assign an Elastic IP. Technically, you have a static IP proxy.

This also means setting up the proxy software, configuring authentication, monitoring health, patching vulnerabilities, and replacing the instance when it dies. Most teams set this up in a weekend and forget about it. Six months later it stops working and nobody remembers why it exists.

Works if you enjoy managing infrastructure. For most teams, the $19/month managed alternative is easier.

Option 3: NAT Gateway (When It Makes Sense)

Cost: $65-200+ per month

NAT Gateway is the right answer if you need all egress traffic from your VPC to appear from the same IPs (not just one API call). Also makes sense if you're already deep in AWS VPC architecture, have very high throughput requirements, or need direct control over the network layer for compliance reasons.

For the specific use case of "I need one API call to come from a static IP," NAT Gateway is overbuilt.

Hidden Costs

Failover and redundancy. One NAT Gateway in one AZ is a single point of failure. Most setups need one per AZ. That's why the real minimum is $65/month, not $32/month. A proxy service includes failover in the base price.

Monitoring and alerting. NAT Gateway logs go to CloudWatch. You need alarms, dashboards, and runbooks. A managed proxy has a status page and sends you an email if it goes down.

Operational debt. NAT Gateways deployed as quick fixes tend to get forgotten. A year later someone asks "Why are we spending $200/month on this?" A $19/month proxy bill is easy to justify and hard to forget.

Decision Framework

Use a proxy service if:

• You only need static IPs for specific outbound calls
• You run on a PaaS (Heroku, Render, Vercel, Railway)
• You want managed failover
• You want to keep things simple
• You're cost-conscious

Roll your own if:

• You enjoy infrastructure work
• You have very specific proxy needs
• You're willing to monitor it
• Your throughput is so high that $5-10/month in compute is negligible

Use NAT Gateway if:

• You already have a mature VPC architecture
• You need all egress traffic from your VPC to be NATted
• You have compliance requirements that mandate it
• You're processing terabytes of data monthly
• Your infrastructure team is already deep in AWS networking

The Numbers

For a typical scenario (Lambda + one partner API call):

Factor in data transfer fees on NAT Gateway and the margins grow.

Common Questions

Can I use a NAT Instance instead of NAT Gateway?

Yes, and you'd save money. But you're back to managing infrastructure with worse performance and less AWS integration.

What about CloudFront or other AWS services?

CloudFront gives you a CDN, not a static IP for outbound connections. Different problem.

Can I get a free static IP somehow?

Not really. AWS Elastic IPs are free if unused, but you're paying for the instance. Most platforms charge for static IPs.

Is the proxy service blocked by firewalls?

No. The partner receives connections from the proxy's static IP. As long as the proxy can reach the partner, you're good.

The Honest Take

NAT Gateway is well-engineered. If you need everything it does, it's worth the cost. Most teams don't need everything it does. Most teams need one static IP for one API call.

For that use case, $19/month solves it. Start there. If you outgrow it, you can migrate to NAT Gateway later.

Try QuotaGuard. It costs less than lunch for a month.