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RPC URL
Since MetaMask uses a default node provider to send transactions for every user, changing your provider to one that dedicates you private resources will make your mint experience a lot smoother and faster.
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How to configure Alchemy as your RPC Node Provider
Start by creating an account on Alchemy and head to your dashboard. Click "+Create app" in the top right corner and use the default settings as you can see in the following screenshot.
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Setup
Once created either set it up through in-bot CLI menu or copy the API Key and paste it in config.json.
Check out this video if you didn't understand something.
P.S. You can also use Infura, Quicknode, Geth local node etc. The process is the same. We're suggesting Alchemy just because it's what most people are comfortable using, but remember any RPC can be faster / slower than another one. Some might rate limit your requests, especially free ones.
P.P.S: We suggest setting up your own Local Node for a smoother and rate limitless experience.