I am trying to display data on my front-end to help users comprehend how the smart contract works instantly.

To achieve that, we can call RPC from TonCenterAPI to get net_item_index on the Collection Contract (followed the TEP62).

But the problem is, if I have 100+ users (customers) refreshing my website, then it's impossible for me to call an API for 100 times to get on-chain data. I must store the data in a database. Or, maybe there is something like TheGraph?

Reference:
https://answers.ton.org/question/1528335026733715456/thegraph-and-chainlink-equivalent-for-ton-network#post-1531224553609498624
https://docs.orbs.network/v3/orbs-lambda/example-use-cases