In addition to @indexsupply making a great backend for your app, it's also a really great debugging tool.
Say you want a transactions's block's extra_data and nonce. Easy:
@indexsupply is not a VC infinite free money project, so always prefer an old fashioned value exchange; but you can get modest service w/o api key.
be sure to checkout the JS/TS package too:
github.com
GitHub - indexsupply/indexsupply.js: TS Client for Index Supply