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API Ninjas

Fitness Free key (no card)

AuthenticationFree key (no card)
Rate limitFree plan has a dashboard-managed monthly quota; noncommercial use only, with attribution required.

Documentation: api-ninjas.com ยท Checked Sep 13, 2026

About

API Ninjas offers a library of over 90 simple APIs behind a single free key, including Exercises, Nutrition, and Calories Burned. You can get workout exercises filtered by muscle or difficulty, estimate the nutrition of any food phrase, or calculate calories burned for activities like running or yoga. The free plan is for noncommercial projects and requires crediting API Ninjas in your app.

Details

Free to start. You may need a free key, but no credit card.

Auth: Free key (no card)

Rate limit: Free plan has a dashboard-managed monthly quota; noncommercial use only, with attribution required.

Verified: 2026-09-13

Best for: personal developer

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Setup

  1. Create a free account on api-ninjas.com to get your API key (no credit card).
  2. Add the key to every request as the X-Api-Key header.
  3. Pick an endpoint from the docs, e.g. /v1/exercises, /v1/nutrition, or /v1/caloriesburned.
  4. Add query filters like muscle=biceps or activity=skiing to get results.
  5. Include 'Data from API Ninjas' credit somewhere in your project.
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