Get token information

[vlbhtcno1]

Hello, I have the token address
Can I get the token information such as the Name, Symbol, and Decimal for that address?

[zemse]

Yes you should be able to call the name(), symbol() and decimals() functions on the token contract. However note that, these methods are optional in the ERC20 specification, so you can come across some ERC20 tokens through which you may not be able to get that information. Also some edge cases: MKR token returns bytes32 value for name & symbol.

[vlbhtcno1]

and another one, Why the event will be delayed. For example, 9AM PairCreated event of token raise but in the code, after few minutes the event will be recieved

[zemse]

When etherscan shows transaction action, they actually look for Approval event. Also they mention the name of platform, like Uniswap or whatever, they likely maintain a list of known protocols and their addresses and if a user approves to an address outside of their list they just simply show the address.

One possible reason can be that the node you're using is behind few blocks, that's why when it receives the block in which PairCreated was emitted, then ethers js receives it.

[vlbhtcno1]

@zemse How can I do to improve the receiving event performance. I'm not blockchains developer so I don't really understand some concepts.
For more information, I build and run my application by node.js in local pc and uses paid service provider from https://www.quicknode.com/ and free provider from https://bsc-dataseed1.defibit.io
But the time that I receive the event is the same

[zemse]

I build and run my application by node.js in local pc and uses paid service provider , But the time that I receive the event is the same

This confirms that the node is in sync. If you're using default settings in your provider, your provider.pollingInterval must be 4000 milliseconds. So at most delay that you'll have is 4 seconds.

Why the event will be delayed. For example, 9AM PairCreated event of token raise but in the code, after few minutes the event will be received

How do you know the PairCreated was created at 9AM, did you create it? If you are comparing the duration from where you pressed the button for creating a pair, then it actually takes time for your tx to be sent to network and confirmed (especially if your gasPrice is low).

[vlbhtcno1]

How do you know the PairCreated was created at 9AM, did you create it? If you are comparing the duration from where you pressed the button for creating a pair, then it actually takes time for your tx to be sent to network and confirmed (especially if your gasPrice is low).

I'm creating an application which used to know when the token can buy right after it's listed on DEX like Uniswap, Pancakeswap and so on.
I follow some guidelines in the internet that I can subscribe PairCreated from Factory Contract address of DEX

I used PooCoin.app to see all the transaction of the contract and saw all transactions have been performing from 9:00AM. but after few minutes, at 9.12AM the event PairCreated will be raised from my code