Which service/library/exchange accepts and pays out cryptocurrency on the project?

Question

bitcoin

Hello, on it project we want to accept and pay with cryptocurrency, how to make it more user-friendly and reliable for the project?

1. There are ready-made crypto processors, but often they use their wallets, which is not safe for the project, because the money may remain with them. Plus, they charge interest on transactions, which is not beneficial for the project. Perhaps there is open-source crypto processing, paid? Where could you substitute your wallets and check the logic?
2. There are separate wallets, exchanges that have their own api, but somewhere you can’t generate many addresses, somewhere only the reception is automated without output, etc. What are the best services to use?

What are the ready-made solutions and nuances in the implementation of your own crypto-processing? Who has experience - is ready to pay paid consultation.

Answer 1

You do not need to reinvent the wheel, in any of the options you will have to pay. Either for a server with a node of the currency you want to use, or for an external service that will keep this node for you and take money for it (the monetization system can be anything, from a subscription to a % fee for each transaction).
And you already communicate with this node using api (json-rpc, web3, etc), the benefit of libraries for working with it is already a whole train and a small cart. And, either you organize the logic - one payment = one wallet, or a little more complicated: one transaction = one payment.
Sending is done through the same cli: either raw transactions with manual setting of network commissions, or give it at the mercy of the node and send it with the notorious sendAmount and analogues and potentially encounter stuck transactions.

Answer 2

Let's search together in a search engine:
Self-hosted bitcoin processors

Answer 3

Coinbase allows this. Just a little uncomfortable. If the price or quantity changes, you need to create a new widget.