In-depth knowledge of the blockchain industry: the Cancun upgrade and blobs
Blobs are cheap because blob data is kept for only about 18 days rather than stored permanently, and it isn’t processed by the EVM, which means a much lighter burden on nodes.
When comparing transaction fees across Layer 2 networks, remember to distinguish between the Layer 2’s own execution fees and the cost of submitting data to the mainnet. Both can vary.
When a Layer 2 network submits blob data to the mainnet, the blob fee is also paid in $ETH .
If you have anything to add, share it in the comments.

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These are just my thoughts and do not constitute investment advice.