What it does
API Ninjas is a hosted provider of REST APIs for application developers. Its directory groups endpoints across areas including finance, internet and technology, AI and computer vision, health, places, text, and transportation. The Inflation API, for example, provides current and historical rates through JSON endpoints. API Ninjas is the data service behind these endpoints, not a client SDK; the company documents standard REST requests and examples in several languages.
Start with the directory and choose an endpoint for the data your application needs. Read its parameters and response fields, then use the documented request pattern with your API key in the X-Api-Key header. For example, the Inflation API documents /v1/inflation for current monthly and annual figures and /v1/inflationhistorical for historical rates. Its examples show cURL and several language options, so a team can use its existing HTTP library rather than adopting a proprietary SDK.
Check the plan conditions before using results commercially or retaining them. The Free plan is intended for evaluation and demos, provides 3,000 calls per month, limits usage to 100 calls per hour, prohibits commercial use and data storage, and requires attribution. Paid plans include commercial use, with higher monthly quotas: Developer lists 100,000 calls, Business 1,000,000, and Professional 10,000,000. The listed monthly prices are $59, $149, and $299 respectively, with lower displayed rates for annual billing. The pricing page says requests are denied after the plan quota rather than billed as overages. No API calls were made and data quality was not independently tested.
Strengths
- A broad directory lets developers find APIs for different data needs under one provider.
- The documented endpoints use standard REST and JSON, with request examples for multiple languages.
- The pricing page spells out monthly call quotas and usage conditions for each listed plan.
Watch out for
- The Free plan is limited to evaluation and demos, with an hourly rate limit, attribution requirement, and no commercial use or data storage.
- Usage is capped by the selected plan; requests are denied after the monthly quota is reached.
Best for
- Developers who need a ready-made data endpoint for a specific application feature
- Prototypes that can evaluate an endpoint within the Free plan's quota and license conditions
- Teams comparing usage quotas and commercial terms across a multi-API provider
Sources
- API Directory - API Ninjas (Oct 25, 2026)
- Inflation API - API Ninjas (Oct 25, 2026)
- Pricing - API Ninjas (Oct 25, 2026)
- API Ninjas | Production-Ready APIs (Oct 25, 2026)