EIP-4844 (Proto-Danksharding), implemented in Ethereum’s “Dencun” upgrade in March 2024, was one of the most impactful Ethereum upgrades in years. It introduced “blobs” — a new data type specifically designed for Layer 2 rollups to post their data cheaply. Before EIP-4844, rollups posted data as calldata (regular transaction data), which was expensive because it was stored permanently. Blobs are temporary (deleted after ~18 days) and have their own fee market, dramatically reducing L2 costs.
The impact was immediate and dramatic. Transaction fees on major rollups dropped 90-99%. Arbitrum transactions that cost $0.10-$0.50 pre-4844 dropped to $0.01 or less. Base, Optimism, and other rollups saw similar reductions. For users, this made L2s competitive with Solana and other cheap L1s on cost. The upgrade effectively solved the cost problem that had made Ethereum’s rollup-centric roadmap seem theoretically sound but practically expensive.
The fee reduction had second-order effects. L2 usage exploded as cheaper transactions enabled new use cases — social applications, gaming, micro-payments, and high-frequency DeFi strategies that were uneconomical at previous fee levels. Base (Coinbase’s L2) particularly benefited, becoming one of the most-used chains in crypto as its near-zero fees attracted memecoin trading and social applications.
However, the blob fee market also impacted Ethereum’s economics. With L2s paying dramatically less for data posting, ETH burn (from EIP-1559) decreased significantly. Ethereum briefly became inflationary again — issuing more ETH through staking rewards than it burned through fees. This reignited the debate about Ethereum’s value accrual: if L2s capture most user activity and fees, does value flow to ETH or to L2 tokens? The “Ethereum is ultrasound money” narrative required revision, and the economic relationship between Ethereum L1 and its L2 ecosystem became the most debated topic in Ethereum’s community.
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