One way to do this is have a node running and triggers a script when an event is sent to the chain. There are ways already built up like https://moralis.io/, but then you can get in to the weeds with things like https://docs.prylabs.network/docs/install/install-with-script. Source: 6 months ago

OpenZeppelin's site is good once you become more familiar with what it is you're doing, and I would also strongly recommend you sign up for a free account with Alchemy who offer a super generous amount of tools/features for you to use, and they recently started up their Alchemy academy -- it's still on waitlist right now but if you're wanting to get in, shoot me a reply in this thread and I'll hook you up. ... Source: about 1 year ago

An API might be a good option for you, moralis has worked well for me in the past - https://moralis.io. Source: almost 2 years ago

When it comes to working of this game, it comes down to a web application. Here I've created a Next app using npx create-next-app. Metamask wallet address for user Authentication, this app uses Next.js framework with Moralis SDK and Redis for querying & storing data into Redis cloud. Here game is rendered using HTML5 canvas. - Source: dev.to / almost 2 years ago

Does blockchain tech replace the backend? Absolutely...Not 👀 As I said, web3 is an addition, supplementary and will not replace existing tech. In major blockchain applications, getting data from smart contracts can cost time and sometimes fail if the RPC is unresponsive. You would still want a database and API to query data collected from smart contracts from, say, events. Examples: The Graph, Moralis. - Source: dev.to / almost 2 years ago

Not exactly a search tool, but this project crawls and aggregates web3 data from multi-chains pretty effectively. You can try out its data tool unidata. https://unidata.app/. Source: almost 2 years ago