Aviationstack ◆
Aviationstack is a scalable REST API for real-time flight tracking, historical flight data, airport info, and global aviation data.

API KISS (Developer Tools): API KISS is a unified API gateway offering dozens of web services via a single, fast, secure endpoint. Pay per request, no monthly fees. Pricing: from $0.01/request (25 free credits on sign-up). (data verified August 2026)
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API KISS is a unified API gateway that provides access to over a dozen essential web services—from weather and crypto prices to SMS and email sending—through a single, elegant API. Instead of integrating with multiple providers, developers can use one set of endpoints to handle common tasks, saving time and simplifying code.
API KISS is designed for developers and businesses building applications that need reliable, low-latency access to APIs for features like IP geolocation, phone lookup, stock photos, QR codes, and more. It's especially useful for startups and teams that want to avoid managing multiple vendor accounts and billing cycles. However, it may not be the best fit for enterprises requiring deep customization or dedicated SLA-based contracts.
Common use cases include: enriching user profiles with IP and phone lookup, sending transactional SMS or emails with automatic failover, generating QR codes for ticketing or marketing, pulling stock quotes or weather data for dashboards, and adding fun features like Chuck Norris facts or UUID generation. API KISS also handles complex operations smartly: for reads, it queries multiple APIs in parallel and returns the fastest response; for writes, it uses a fallback strategy to ensure reliability.
Editorial score from our review methodology — not user ratings.
API KISS pricing: from $0.01/request (25 free credits on sign-up). Billing model: Freemium.
No monthly fees, no commitments. Each request costs $0.01 (1 credit = 1 request). Get 25 free credits on sign-up—no credit card required. Credits never expire. Failed requests don't cost you anything. Bulk discounts available for high-volume needs (contact for custom pricing).
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