2
Chainlink
Tellor
Bandchain
Please note, you can get started with a single centralized way to pull data from an API, but for your contract to be decentralized you'd want to pull data from multiple sources via multiple nodes.
You can, for example, pull data from a single Chainlink node just to start developing, however for a production grade system you'd want ...
2
You need to programmatically refresh the page to get web3 injected by metamask. You can write a recurisve function which will not run indefinetly and will refresh if metamask was not installed and installed later:
function checkWeb3ProviderRecursively(firstCall = true) {
if (typeof window.ethereum !== 'undefined') {
console.log("web3 provide ...
1
The Ethereum transactions have a parameter called "nonce" representing the number of transactions sent from the address. You must increment this nonce each time you send a new transaction with the same address. So if you sign a transaction without broadcasting it, then send a new transaction to the network (with the same address and same nonce), ...
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