Ever wondered what recipes you can cook with the ingredients you have in your fridge or pantry? This endpoint lets you find recipes that either maximize the usage of ingredients you have at hand (pre shopping) or minimize the ingredients that you don't currently have (post shopping).
The full documentation of the endpoint is here https://market.mashape.com/spoonacular/recipe-food-nutrition#find-by-ingredients. If you want to combine this search with a query or search within a certain range of macro nutrients, you can perform a complex recipe search here https://market.mashape.com/spoonacular/recipe-food-nutrition#complex-recipe-search.
The API response will give you arrays of usedIngredients, missedIngredients, and unusedIngredients for each returned recipe. This diagram shows you what they mean:
Here you can visually play with that endpoint.
Create a list of ingredients and see which recipes match those ingredients.