I'm looking for a well documented, easy to use API that provides data on the majority of cryptocurrencies. That data should include the 1 hr, 24hr, and 7 day price changes, as well as the entire history of the volume, and price for each crypto. I've looked into some APIs but none have provided this sort of comprehensive information. There are many great sites that have access to this sort of data, so it must be out there. Any help is appreciated! Thanks!
Most exchanges offer API solutions for market data. Here are some examples:
CryptoCompare has an API that aggregates data from many exchanges, and they also offer many query parameters. Link: CryptoCompareAPI
Additionally, many block explorers provide APIs for blockchain account information.
This ZChain Playlist shows how to use PowerShell to query the ZChain ZCash block explorer API.
at Kaiko (www.kaiko.com) we are able to provide you with this comprehensive datasets. We are a market data infrastructure company since our creation in 2014 and provide trade data, order books and aggregated data (ohclv, vwap, count). We already work with funds, academics, and individual traders and are currently growing fast. Happy to speak with any of you that have data requirements, just contact us via our website.
Full disclosure: I work at Kaiko :)