For what it is worth, electrum has a lot or possibly all of what you are
talking about since the electrum servers are designed to quickly answer the
queries of light clients.  So right now, you could sync up an electrum
server or use an existing public one and send queries to it with json-rpc.

https://github.com/kyuupichan/electrumx/blob/master/docs/protocol-methods.rst


On Tue, Aug 28, 2018 at 5:36 AM Blockchain Group via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Hello everyone,
>
> I am C++ & Node.js developer. I want to propose making a new Bitcoin API
> that supports fast quering of Bitcoin blocks and transactions without the
> need for syncing with all previous nodes.
>
> In a typical case where I want to build a full fleged Bitcoin explorer cum
> wallet system on my end with external APIs, I need to sync my node and then
> query for the information I need to show separately. I am proposing a
> unified method of finding/quering the blockchain data with a standardized
> template containing minimal information about the actual mined block or
> transaction yet satify the need of what I want to query.
>
> I am working on making a template and a support mechanism on Node.js. I
> want to propose it as an improvement (BIP). It will be a great help to
> future web developers who want to make something similar.
>
> Thanks
> Sumit Lahiri.
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