Best API Gateway Solutions for Microservices Under $100/Month

Building microservices is the easy part. The hard part — routing traffic, enforcing auth, rate-limiting, and keeping observability — is where an API gateway earns its keep. But if you're a startup, a side project, or a lean team, the price tags on enterprise gateways can sting.

We dug into the pricing docs and benchmarks to find the API gateways that give you professional-grade traffic management without forcing you to choose between ramen and infrastructure. Here's what we found.

AWS API Gateway — Best Managed Gateway

If you want to offload ops entirely, AWS API Gateway is the default for good reason. It handles REST, HTTP, and WebSocket APIs, integrates natively with Lambda, and — crucially — offers a generous free tier: one million API calls per month for REST and HTTP APIs for the first 12 months.1 After that, pay-as-you-go pricing means small microservices with moderate traffic easily stay well under $100/month.

The trade-off? You're locked into the AWS ecosystem, and costs can scale unpredictably if traffic spikes. But for teams already on AWS, the integration with CloudWatch, IAM, and WAF makes it the lowest-ops choice on the list.

Kong Gateway — Best Open-Source Performance

Kong is the industry standard for self-hosted API gateways. Built on Nginx and Lua, it's known for blazing performance and a plugin ecosystem that covers authentication, caching, logging, and traffic control.2 The open-source version is free to self-host — zero license cost — making it the best "zero-dollar" option for teams that have the DevOps chops to run it.

Kong's dynamic configuration means you can update routes and plugins without reloading the server, which is a game-changer for CI/CD pipelines. The enterprise version adds a management UI and support, but the community edition is more than enough for most microservices setups under $100/month.

KrakenD — Best for Backend-for-Frontend (BFF) Patterns

KrakenD takes a different approach: it's stateless and ultra-performant. Designed as a pure API gateway (no embedded plugins that add latency), it excels at the Backend-for-Frontend pattern — aggregating multiple microservice responses into a single, client-friendly payload.3

The open-source version is free, and its configuration-driven approach (JSON/YAML) makes it easy to version-control your gateway setup. If your architecture involves multiple front-end clients (web, mobile, IoT) that each need different views of the same backend data, KrakenD's BFF-first design is the thing actually worth buying.

Tyk — Best Management Dashboard

Tyk rounds out our list with the strongest management and analytics offering in the open-source space. Its dashboard provides enterprise-style API analytics, developer portals, and granular rate limiting — all available in the free, self-hosted version.

For teams that need visibility into who's calling what, with what latency, and how often, Tyk's built-in analytics save you from stitching together separate monitoring tools. The learning curve is gentler than Kong's, and the dashboard makes it viable for teams without dedicated API infrastructure engineers.

Comparison Table

Why These Choices

The fundamental trade-off here is managed vs. self-hosted. AWS API Gateway gives you zero ops but variable cost; Kong, KrakenD, and Tyk give you zero license cost but require you to run and maintain the infrastructure. For teams under $100/month, the math is simple: if you're already on AWS and traffic is modest, the managed route wins on time-to-value. If you have DevOps capacity and want to keep costs flat regardless of traffic, open-source is the smarter long-term bet.

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