Create Bitcoin and Litecoin Wallet using any API Provider

Create Bitcoin and Litecoin Wallet using any API Provider

I am doing R&D on creating USer's bitcoin and litecoin wallet using any API. a scenario is like when user signup with my website I want to create that users bitcoin and litecoin wallet account. I have checked Coinbase for that but I think they are not providing,

Can anyone suggest any API can provide that kind of functionality?

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