choose a proper scalar for mainnet

[blockchaindevsh]

The scalar value is responsible for dealing with the conversion ratio.

We also need to adjust it when the ratio changes a lot.

[qizhou]

According to here, we need to confirm three variables defined by the scalar:

• l1BaseFeeScalar
• l1BlobBaseFeeScalar
• l1BlobBaseFee
• l1BaseFee
  where l1BaseFee is the l1 gas price and l1BlobBaseFee is the l1 BLOB gas price. A code to read the data from deposit tx can be found here.

Suppose the ratio of the XYZ/ETH is 1 ETH = x XYZ token, then a simple formula will be

• l1BaseFeeScalar = x * OP mainnet's l1BaseFeeScalar
• l1BlobBaseFeeScalar = x * OP mainnet's l1BlobBaseFeeScalar

To have a safe margin and avoid frequent update because of x, we may

• l1BaseFeeScalar = y * OP mainnet's l1BaseFeeScalar
• l1BlobBaseFeeScalar = y * OP mainnet's l1BlobBaseFeeScalar
  where y = 1.5 * x

and when x is changed with a fixed y, we send the scalar-update tx for new y if y < x.

NOTE: In fact, we may have better scalars value by analyzing the actual l1 cost here. The results show that OP mainnet charges about 2x of l1 gas fee, and 1x of l1 blob fee.