StarkNet Cairo app chains after Ethereum Pectra upgrade

The Pectra hard fork activated on May 7, 2025, and it fundamentally altered the economic baseline for Layer 2 networks. By doubling blob throughput and slashing data costs, the upgrade made settlement on Ethereum nearly free for rollups. For StarkNet, a validity rollup that relies on STARK proofs to verify off-chain computation, this shift creates a distinct advantage. While EVM-compatible chains benefit from general-purpose scaling, StarkNet’s architecture is optimized for high-throughput, low-cost verification. The result is a landscape where building complex applications in Cairo becomes significantly more viable than ever before. I see this as a clear win for native ZK developers who have long waited for the underlying infrastructure to catch up with their ambitions.

Data costs collapse for rollups

EIP-7691 increased the target number of blobs per block from three to six and raised the maximum limit from six to nine. This change directly impacts the cost of posting data to Ethereum L1. Before Pectra, the average daily ETH burn from rollup data posting was 11.22 ETH. After the upgrade, that figure dropped to 3.26 ETH, representing a 71% decrease. Daily blob purchases by rollups rose by 20.8%, averaging 25,600 blobs per day, yet the average blob cost fell to virtually zero. Rollups now pay less than a thousandth of a penny daily for data space. This reduction has greatly benefited StarkNet financially, as the network can process larger batches of transactions without the overhead of expensive L1 settlements. The S-two prover, which handles client-side proving on everyday devices, benefits from this efficiency by reducing the computational burden associated with generating proofs for these massive data sets.

The Fusaka hard fork, which went live on December 3, 2025, extended these gains through PeerDAS. This mechanism unlocked roughly eight times the data throughput for rollups. Consequently, Layer 2 transaction fees on major networks, including StarkNet, now sit consistently below $0.02. L2 aggregate TPS crossed 1,220 by late 2025, scaling Ethereum’s base layer by a factor of about 20x. These numbers confirm that the data availability layer is no longer a bottleneck. Developers can now design dApps with heavy state transitions or frequent interactions without worrying about prohibitive gas fees. The cost structure has shifted from a variable expense to a near-fixed, negligible one.

Smart accounts meet Cairo logic

EIP-7702 allowed Externally Owned Accounts to temporarily execute smart contract code during a transaction. This feature enabled capabilities like transaction batching, gas sponsorship, and delegation to alternative key schemes. By September 2026, more than 27 million Ethereum accounts had used a delegation. However, attackers adapted quickly. A USENIX Security 2026 study found that 63% of early authorisation transactions across seven chains linked to attacker contracts, resulting in $2.36 million in losses. Most losses stemmed from phished signatures or leaked seed phrases rather than flaws in EIP-7702 itself. The risk lies in how fast a compromised wallet can be emptied.

StarkNet addresses this differently through Native Account Abstraction. All accounts on StarkNet are smart accounts by default. Their behavior is determined by developers rather than at the protocol level. This means users do not need to "upgrade" their wallets via EIP-7702 delegations. Instead, they interact with applications that define custom signing rules and recovery mechanisms in Cairo. This approach eliminates the security risks associated with temporary code execution on EOAs. Developers can build robust, user-friendly account management features without relying on external bundlers or paymasters. The integration of STRK20 further enhances this by bringing privacy into assets and wallets already used on StarkNet. Users can shield balances and transfer privately, adding a layer of security that standard EVM wallets lack.

Cairo-native development advantages

Cairo is the native smart contract language for StarkNet, designed specifically for STARK-proving general computation. It has been in production on Ethereum Mainnet since June 2020. Unlike EVM bytecode, Cairo allows developers to write arbitrary business logic while maintaining verifiability. The S-two prover proves Starknet transactions within SHARP, combining proofs to reduce verification costs. Stone then produces the final proof checked on Ethereum. This pipeline is highly efficient, especially given the reduced L1 costs post-Pectra.

The ecosystem is entering a phase where complex applications become economically feasible. Broly lets users inscribe data on Bitcoin directly from Starknet in a trust-minimized way. Private Bitcoin is also live on Starknet, powered by STRK20, allowing users to put BTC to work across Starknet DeFi. These cross-chain capabilities rely on the secure settlement provided by STARK proofs. With L1 data costs near zero, the marginal cost of settling these cross-chain operations drops significantly. I would recommend builders focus on these cross-chain use cases, as the current fee environment makes them highly profitable. The question remains whether other ZK rollups can match this specific combination of low-cost data availability and native account abstraction.