Ethereum

Rollups buy blobs in whole units, right? So Optimism can't get into a blob in the same block as Arbitrum, which is where the competition for fees come in?

Can the L2s coordinate to post their data at agreed upon intervals so there is no competition among the L2s for the same block's blob and we get dirt cheap L2 fees?

Indie dev and dad.
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I believe there is a limit of 6 blobs per block to start

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The fee increases when there are more than the target 3 blobs in a block

The fee increases when there are more than the target 3 blobs in a block

https://consensys.io/blog/ethereum-evolved-dencun-upgrade-part-5-eip-4844

TIL! That's enough for all the big ones to get a blob per block without competing.