The only limitation is the rate limited 50 calls per minute (that is way better than the 100 per month limit of rapidapi) you don't have limited data compared to other plans; keep in mind that if you are doing a custom API you should also keep it updated to make it usable (because an API that show you data not updated is basically worthless).
BTW, be really careful with the data that you are providing because it can be considered investment advice and give you legal trouble, if you really want to mantain this addon I will suggest to use an external API provider to avoid any trouble (they are big so leave the legal trouble to them in case), if you just want to practice with node IMO it is better if you try to play with safer datasets.
