List of blockchain explorer APIs? I'm gathering a list of Bitcoin / Blockchain APIs. I mean web (REST) APIs that allow you to do basic blockchain queries through http(s) API calls, such as: getting the balance on an address, getting a list of transactions from or to an address, getting the details (inputs and outputs) for a transaction, et cetera.

I'm familiar with blocktrail.com, blockcypher.com, blockchain.info, and blockr.io, but I remember having seen others in the past. Any more?
Insight by bitpay:

https://insight.bitpay.com/

Block Explorer:

https://blockexplorer.com/

Bitcoin Chain:

https://bitcoinchain.com/block_explorer

There are many more in development, but these are ones I could find that you didn't list.