I am the author of hd-wallet-addrs, a tool for finding all addresses in an HD wallet that have ever received funds.

I just now integrated blockcypher.com into the tool as a blockchain data provider. Unfortunately, the one-address-per request limitation slows the tool to a crawl. I am referring to this type of query:

https://api.blockcypher.com/v1/btc/main/addrs/1Ge6rDuyCdYVGhXZjcK4251q67GXMKx6xK

I have found a couple blockchain data providers that do support multi-address lookups, namely blockchain.info and btc.com. I hope we can bring blockcypher's performance in the tool up to the same speed as these provide. Especially as it is possible to self-host blockcypher code. This would give people the possibility to run the tool in a totally private way.

I'm sure that multi-address lookups would benefit others as well. Mine is just one use case example.

thanks!