Questions tagged [transferfrom]

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transferFrom function not working in ICO Smart contract

I am facing issues with the transferFrom function of smart contract address 0x6560a9b6436e129cf835ab9da96201207facd4f8: I copied the smart contract code from etherscan.io and deployed on ropsten ...
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Can I have a listener to cryptocurrencies / tokens reaching a specific address?

Let's say that there is an address called 0x1 There is another address called 0x2 which just released a new token called ABA. Is there a way to constantly listen for 0x1 to see if it receives ABA ...
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When I tap buy button in market how does wallet check my allowance instantly?

On CrytpoKitties, when I tap the buy button in a market, MetaMask comes up and shows if I can buy or not based on allowance instantly. How is this possible? Is it making query? Is it included in kitty'...
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Do dapps(contract) check allowance of buyer when he calls buy function?

When a buyer calls a buy function on dapp contract, some dapps check the buyer's allowance before transfer tokens(erc20). Is it usual?