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I am testing my Dapp and need host:port for testnet and mainnet. Please can you let me know where can I find these urls? Also, what if the url (host:port) i provide and it goes down?

2 Answers 2

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I would suggest you create an account at https://infura.io. They're providing the infrastructure for what you're looking for.

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One way is to run your own node with geth and geth --testnet. This way you can connect to them from your app. geth also allows custom post numbers with --port

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