For example, DOT has 10 but can I check it in Polkadot JS Apps? I want to apply it to all parachain assets.
system_properties RPC call returns the on-chain properties for the connected chain.
Additionally, if using the JS API, it is also extracted and available on
api.registry.chainTokens. (For each parachain, you need to get it from the chain itself)
for native asset like
DOT in polkadot is defined in chain spec and you can check here https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fpolkadot.api.onfinality.io%2Fpublic-ws#/settings/metadata
for multiple fungible asset chain like
statemine you may check it from storage in