The best alternatives to Rapids Finance are Stripe, Crypto Subscriptions API, and Kryptoney. If these 3 options don't work for you, we've listed a few more alternatives below.
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Million of people hold cryptocurrency, from today with Kryptoney you can accept their payments on your website. Even if you do not have a cryptocurrency wallet, Kryptoney can convert the payments in your native currency.
SendCrypto is a bot for sending crypto payments on Twitter, Reddit, and Slack. No deposits or withdrawals - send directly from your wallet to their's with no middlemen.