Mjcrypto for OC3.x.x.x 3.2.1 - no middleman - no added processing fees by using this extension, just whatever service you and the customer use.
Don't pay even more fees by using another un-needed middle man, use this extension that doesn't charge any per transaction fee since it doesn't handle any crypto currencies directly.

What does this do?
-It calculates the total of the shopping cart in various crypto currencies.
-It will allow the customer to chose a crypto currency to pay in, process an order, and get that rate applied to the success page. -- Then it is on you and your customer to finalize the transaction (think like a check/money order).
-It will show a QR code for the chosen crypto and amount on the success page.
-It includes a QR code, address and amount in the customer email.
-It caches the rates with the time of cache settable in admin, to prevent overloading the rate query and possibly being penalized for too many request breaking this extension.
-*Displays the rates as shown by different currencies on your frontend - (beta). Well tested using USD as the fiat currency for crypto rates, other rates tested lightly.

What it does NOT do:
-It does NOT charge any per transaction fee for this extension! You only pay once for this extension and no fees go to us for any crypto currency transaction. Why pay a fee to another middle-man? The exchange of crypto already has fees, don't pay a middle man service another fee.
-It does NOT collect, handle, or broker any crypto transfer.
-It does NOT transfer any crypto currency.
-It does NOT deal with the crypto currency in any way except showing the customer how much, and the address, to send the crypto currency to.
-It does NOT enforce a timeline for payment. That is on you and your customer.

What you need:
-You deciding what crypto currency you wish to accept to your wallet and update the file with the data for each.
-A crypto currency name and address for EACH crypto currency you wish to accept.
--You update the file that includes what cryptocurrency and the related address.
-A way to receive crypto currency (a wallet and a wallet address for each crypto).
-Knowledge on how to guide your customer to send crypto (We have included a link to a video on how to do it).

This extension has been tested with the default checkout theme and it works with the default theme, we can not guarantee any other theme but it should work with a lot of them that do not have a caching function or that make extensive changes to the checkout process.

***Disclaimer! We are NOT responsible for your customer sending crypto to the wrong address! Since we do not handle or broker the handling of any crypto currency we have zero control over what happens to any of it, and are not responsible for claimed lost crypto currency. Also it is on you to create your cryptocurrency address in your wallet. Use of this extension constitutes agreement to these terms.***

This extension gets a quote for the cryptos you wish to offer as a payment method and it will allow the customer to choose which crypto currency they wish to pay. It shows the amount of crypto needed to send for order total and wallet address.

When they confirm their order they will be presented with the success page with the cart total, cart total in the crypto they chose, the address they will need to send the crypto to. They will also be presented with a QR code containing this same info.

You will need to have your OWN ACCOUNT with a service that can receive crypto into your wallet(s). Places like coinbase, binance, eToro, Gemini, etc. facilitate this.
Also! This extension does NOT handle the acceptance of the crypto currency it just presents the customer with the address and amount they will need to send their payment to.