ethers.js: provider.getGasPrice()

Question

In ethers.js you can use provider.getGasPrice() to get a best-guess estimate of the gas you should pay. Is there anything simple I can call or transform onto this value in order to get what an equivalent of a "Fast" transaction would be instead of an "Average" speed transaction?

Answer 1

The getGasPrice() queries your provider JSON-RPC method eth_gasPrice and simply proxies whathever your provider returned.

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In order to calculate the "Fast" and "Average" speed, you'll need to define what you consider these metrics. For example you can collect all transactions within the last 20 blocks (approx. 5 minutes) and look for percentiles in the historic data:

• Top 10% percentil of gas prices is "Fast"
• Top 50% percentil of gas prices is "Average"

You can get transactions in a block using the getBlockWithTransactions() ethers.js method. In each transaction you're looking for the gasPrice property.