Best Rate Limiting and API Gateway Solutions
Best Rate Limiting and API Gateway Solutions
Every public API needs rate limiting. Every microservices architecture needs an API gateway. These tools sit between clients and your backend — handling authentication, rate limiting, request routing, transformation, caching, and monitoring.
TL;DR
| Rank | Solution | Best For | Starting Price |
|---|---|---|---|
| 1 | Kong | Self-hosted, enterprise | Free (open source) |
| 2 | Zuplo | API-first, edge-deployed | Free (250K requests/mo) |
| 3 | Unkey | API key management + rate limiting | Free (100K verifications/mo) |
| 4 | AWS API Gateway | AWS ecosystem, serverless | $1/1M requests |
| 5 | Cloudflare API Shield | DDoS protection + rate limiting | Included with Pro ($20/mo) |
| 6 | Traefik | Kubernetes, open source | Free (open source) |
1. Kong — Most Popular Open-Source Gateway
Best for: Self-hosted API gateway with plugin ecosystem
Kong is the most widely-deployed open-source API gateway. Built on Nginx/OpenResty with a plugin architecture for authentication, rate limiting, logging, transformations, and more. Kong Gateway (OSS) is free. Kong Konnect is the managed cloud version with enterprise features.
Key strengths: Open source (Apache 2.0), 100+ plugins, rate limiting (multiple algorithms), OAuth2/JWT/key-auth, request/response transformation, load balancing, service mesh, multi-cloud.
Pricing: Kong Gateway OSS: free. Kong Konnect (cloud): free tier, Plus at $75/month, Enterprise custom.
Limitations: Self-hosted OSS requires operational expertise. Plugin configuration is YAML/API-based (no visual editor in OSS). Enterprise features (developer portal, analytics, RBAC) require Konnect. Memory-intensive.
2. Zuplo — API-First Gateway
Best for: Developer-first API management with edge deployment
Zuplo deploys at the edge (Cloudflare Workers) and provides API key management, rate limiting, developer portal, and OpenAPI integration as a unified platform. GitOps workflow — configure via JSON/TypeScript in your repo.
Key strengths: Edge deployment (300+ PoPs), built-in API key management, automatic developer portal from OpenAPI, rate limiting, request/response policies, GitOps configuration, TypeScript custom handlers.
Pricing: Free: 250K requests/month. Builder at $25/month (2M requests). Business at $250/month (20M requests).
Limitations: Newer platform with smaller ecosystem. Edge-only deployment may not suit all architectures. Custom policies require TypeScript. Less mature plugin ecosystem than Kong.
3. Unkey — API Key Management
Best for: API key issuing, verification, and rate limiting as a service
Unkey is purpose-built for API key management. Create, verify, and revoke API keys with per-key rate limiting, expiration, and usage analytics. Not a full API gateway — it's the authentication and rate limiting layer that sits in front of your API.
Key strengths: Per-key rate limiting, key expiration, usage analytics, temporary keys, key verification in <40ms, ratelimit API (use without key management), open source.
Pricing: Free: 100K verifications/month. Pro at $25/month (2.5M verifications). Custom enterprise.
Limitations: Not a full API gateway (no routing, transformation, caching). Requires integration into your application code. Newer platform. No request proxying — verification only.
4. AWS API Gateway — Serverless APIs
Best for: Serverless architectures on AWS with Lambda integration
AWS API Gateway creates REST and WebSocket APIs backed by Lambda, HTTP backends, or AWS services. Usage plans with API keys and throttling. Caching, request validation, and WAF integration.
Key strengths: Lambda integration, WebSocket APIs, usage plans, API key management, request validation, caching, WAF integration, CloudWatch monitoring, custom authorizers.
Pricing: REST API: $1/1M requests + $0.09/GB data transfer. HTTP API: $1/1M requests (simpler, cheaper). WebSocket: $1/1M messages.
Limitations: AWS-only. Cold start latency with Lambda. 30-second timeout limit. Complex configuration. Per-request pricing compounds at high volume. No self-hosting.
5. Cloudflare API Shield — Edge Protection
Best for: DDoS protection and rate limiting for existing APIs
Cloudflare API Shield adds rate limiting, mTLS authentication, schema validation, and sequence detection to any API behind Cloudflare. Not a gateway — it's a protection layer at the edge. Rate limiting rules based on IP, headers, cookies, or custom keys.
Key strengths: DDoS protection, rate limiting (custom rules), mTLS, API schema validation, sequence detection (abuse prevention), bot management, 300+ PoPs, included with Cloudflare plans.
Pricing: Basic rate limiting included with Pro ($20/month). Advanced rate limiting with Business ($200/month). Enterprise for full API Shield.
Limitations: Requires Cloudflare as DNS/CDN provider. Not a gateway (no routing, transformation). Advanced features require expensive plans. Rate limiting rules have configuration limits on lower tiers.
6. Traefik — Kubernetes-Native Gateway
Best for: Kubernetes API gateway with automatic service discovery
Traefik is an open-source edge router and API gateway designed for containerized environments. Automatic service discovery in Kubernetes, Docker, and Consul. Built-in rate limiting, circuit breakers, retries, and Let's Encrypt certificate management.
Key strengths: Kubernetes-native, automatic service discovery, Let's Encrypt auto-SSL, rate limiting middleware, circuit breaker, retry, access logs, Prometheus metrics, open source.
Pricing: Free (open source). Traefik Enterprise for additional features.
Limitations: Primarily a reverse proxy/load balancer — API management features are basic compared to Kong. No built-in API key management, developer portal, or analytics. Configuration via Kubernetes CRDs requires learning curve.
How to Choose
| Use Case | Recommended | Why |
|---|---|---|
| Self-hosted API gateway | Kong | Most plugins, largest community |
| Developer-first API management | Zuplo | Edge deployment, GitOps, dev portal |
| API key management | Unkey | Purpose-built key + rate limiting |
| AWS serverless APIs | AWS API Gateway | Lambda integration |
| DDoS + rate limiting | Cloudflare API Shield | Edge protection |
| Kubernetes gateway | Traefik | Auto service discovery, K8s-native |
Comparing API gateways? Explore Kong, Zuplo, AWS API Gateway, and more on APIScout — pricing, features, and developer experience across every major API management platform.