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I am looking for an API service that allows my web app to generate Ethereum a deposit address, detect and notify a callback URL when a user sends ether to that address, and forward the funds to "cold" addresses.

Is there such a service out there? If not is there another way of programmatically detecting and forwarding deposits without running one's own Ethereum node?

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There is official Ethereum JavaScript API which offer a Javascript based API to interact with an Ethereum node.

To send a transaction you can use web3.eth.sendTransaction

web3.eth.sendTransaction(transactionObject [, callback])

which offers a callback too.

To create an address you can try LightWallet

generate a new address with keystore.generateNewAddress

keystore.generateNewAddress(pwDerivedKey [, num, hdPathString])
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You can check Blockcypher, it's the only public service I could find that offers notifications via webhooks and websockets.

  • but this does not send web hooks if you are trying to work with erc20 tokens. Have you been able to see any workaround on erc20 transactions webhooks? – Oluwatumbi Mar 27 '18 at 15:53
  • If you work with tokens, you have a smart contract which emits events. You can listen for these events if you run a geth node. – ulu Mar 28 '18 at 13:19
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You can check this Telegram bot @MyETH_bot

It can:

  • check your addresses every 30 seconds
  • automatically send webhooks on each transaction of ETH and ERC20 tokens with data like: address, balance change, current balance, etc

Check https://myeth.io to learn more

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I think crypitor is what you need, they support internal transaction on ethereum as well.

you can monitor the total in and out of an address in a transaction.

No need to scan every address anymore. Also i saw them support ERC20 transaction. It increases performance for your application.

You just need to build a webhook api to listening their push data (webhook service). More detail on their document and homepage

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