Need a node to read onchain data (blockchain, web3)

When I work on web3, I think there an interested node which could read onchain blockchain data (not sure if do more like: PUT, POST…):

Networks:

  1. Ethereum (or EVM)
  2. Polygon
  3. Cardano

More in Web3 storage api:

  1. IPFS (Filecoin, Arweave)
  2. BTFS
  3. S5 (Sia)