Best API Gateway Tools for Microservices Under $100

Why Your Microservices Need an API Gateway

An API gateway is the front door to your microservices architecture. Instead of every client talking directly to dozens of internal services, a gateway sits in between — handling routing, authentication, rate-limiting, caching, and observability in one place. It's the single entry point that keeps your service mesh manageable.

For small teams and indie developers, the enterprise options are a non-starter. Apigee X and Azure API Management are powerful but priced for enterprises with budgets to match. Even AWS API Gateway, while pay-as-you-go, can rack up costs quickly as traffic grows6. The good news? The best open-source gateways are free to self-host and rival paid offerings in raw capability. All you need is a $5–20/month VPS or an existing Kubernetes cluster.

We evaluated five open-source API gateways that fit comfortably under the $100/month threshold — comparing their core engines, plugin ecosystems, protocol support, and ideal use cases. Here's how they stack up.

1. Kong Gateway OSS — The Industry Standard

Kong is the most widely adopted open-source API gateway, and for good reason1. Built on NGINX and Lua, it delivers high throughput with a plugin-based architecture that lets you bolt on authentication, rate-limiting, logging, and transformations without writing custom middleware. The plugin ecosystem is massive — community and official plugins cover everything from JWT auth to Prometheus metrics.

Kong scales from a single-node deployment up to a full service mesh via Kong Mesh integration1. That means you can start small and grow without ripping out your gateway layer. The trade-off: Kong's NGINX+Lua stack has more moving parts than some newer Go-based alternatives, and the configuration learning curve is real for first-timers.

Verdict: If you want the largest community, the deepest plugin library, and a proven path from simple gateway to service mesh, Kong is the default choice.

2. Tyk API Gateway — Best for GraphQL and Built-in UI

Tyk takes a different approach: it's written in Go, which makes it lighter on resources than Kong's NGINX+Lua core2. Where Tyk shines is its first-class GraphQL and REST support — both protocols are handled natively, making it ideal for teams running mixed API stacks.

Tyk also includes a built-in dashboard in its open-source offering, which is a notable advantage over gateways that require third-party tooling for visibility2. It's Redis-backed for distributed rate-limiting and caching, so you'll need Redis running alongside it — a minor operational dependency but one that adds resilience at scale.

Verdict: For teams who need GraphQL and REST side by side, and who value a built-in dashboard over a bare CLI experience, Tyk is the strongest pick.

3. KrakenD — Best for Response Aggregation and Statelessness

KrakenD is built around the Backend-for-Frontend (BFF) pattern3. Instead of simply proxying requests, it can aggregate responses from multiple microservices into a single client-facing payload — dramatically reducing the number of round-trips a client needs to make. This is especially powerful for mobile apps and SPAs where latency is critical.

What sets KrakenD apart architecturally is its statelessness3. It has no external database or Redis dependency — every instance is self-contained, which makes horizontal scaling trivially simple. The trade-off is that some stateful features (like distributed rate-limiting across nodes) require the paid tier or external tooling.

Verdict: If your microservices architecture would benefit from response aggregation and you want a gateway with zero external dependencies, KrakenD is purpose-built for that job.

4. Traefik Proxy — Best for Kubernetes Auto-Discovery

Traefik isn't a traditional API gateway — it's a modern HTTP reverse proxy and load balancer designed specifically for microservices4. Its standout feature is auto-discovery: in a Kubernetes or Docker Swarm environment, Traefik automatically detects new services and configures routing without manual reloads or config file edits.

Rate-limiting and other middleware are configured via labels or annotations, keeping everything declarative and version-controllable4. Traefik's weakness compared to dedicated gateways like Kong or Tyk is a smaller plugin ecosystem and less granular API-management features (no built-in API key management portal, for instance).

Verdict: For containerized microservices on Kubernetes, Traefik's auto-discovery and native K8s integration make it the path of least resistance.

5. Gloo Gateway — Best for Envoy and gRPC Shops

Gloo Gateway is built on Envoy Proxy and optimized for Kubernetes and cloud-native workloads5. Its differentiator is advanced functional routing — routing decisions can be made based on request body content, headers, and gRPC method calls, not just URL paths. For teams heavily invested in gRPC and Envoy's observability stack, Gloo fits naturally.

Gloo's tight Kubernetes integration means it's less suited for bare-metal or VM-based deployments where you'd prefer a gateway that doesn't assume a container orchestrator5. But within its target environment, it's a compelling option with strong gRPC support and Envoy's battle-tested performance.

Verdict: If your stack already runs Envoy and gRPC, Gloo is the gateway that speaks your language natively.

How They Compare

The Under-$100 Reality

All five gateways are free and open-source when self-hosted. Your only cost is infrastructure — a $5/month VPS from DigitalOcean or Hetzner is enough to run Kong, Tyk, or KrakenD for a small-to-medium workload. Traefik and Gloo shine when you already have a Kubernetes cluster (which can itself run on a $20/month multi-node setup).

For context, AWS API Gateway charges per million requests plus data transfer6 — costs that scale linearly with traffic and can easily exceed $100/month for a moderately busy API. Self-hosting one of these open-source gateways puts a hard ceiling on your costs: your VPS bill stays flat regardless of request volume.

Disclosure: Recomate may earn a commission when you sign up for managed tiers of these tools through our links. The open-source self-hosted versions are always free — we recommend starting there.

How to Choose

• You want the biggest ecosystem and community: Kong Gateway OSS
• You need GraphQL and REST with a dashboard: Tyk API Gateway
• You want response aggregation with zero dependencies: KrakenD
• You're on Kubernetes and want auto-discovery: Traefik Proxy
• You're an Envoy/gRPC shop: Gloo Gateway

All five are production-tested, actively maintained, and free to self-host. Start with the one that matches your architecture — not your budget, because the budget question is already answered.

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