Sure, here are some API project ideas and their requirements:

1. Weather API
- Requirements: Access to real-time weather data, ability to retrieve data by location or zip code, ability to retrieve data in various units (e.g. Celsius, Fahrenheit), ability to handle high traffic volume.

2. Movie Database API
- Requirements: Access to a large database of movies and TV shows, ability to search and retrieve data by title, genre, year, etc., ability to retrieve data on actors and directors, ability to handle high traffic volume.

3. Recipe API
- Requirements: Access to a large database of recipes, ability to search and retrieve data by ingredient, cuisine, dietary restrictions, etc., ability to retrieve data on nutritional information, ability to handle high traffic volume.

4. Stock Market API
- Requirements: Access to real-time stock market data, ability to retrieve data by ticker symbol, ability to retrieve data on historical prices, ability to handle high traffic volume.

5. News API
- Requirements: Access to a large database of news articles, ability to search and retrieve data by topic, date, source, etc., ability to handle high traffic volume.

6. Sports API
- Requirements: Access to real-time sports data, ability to retrieve data on scores, schedules, standings, etc., ability to handle high traffic volume.

7. Music API
- Requirements: Access to a large database of music, ability to search and retrieve data by artist, album, genre, etc., ability to retrieve data on lyrics, album art, etc., ability to handle high traffic volume.

8. Translation API
- Requirements: Access to a high-quality translation engine, ability to translate text in various languages, ability to handle high traffic volume.

9. Social Media API
- Requirements: Access to a social media platform's API, ability to retrieve data on users, posts, comments, etc., ability to handle high traffic volume.

10. Payment API
- Requirements: Access to a payment gateway's API, ability to process payments securely, ability to handle high traffic volume.
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