AWS Blockchain Tracker provides a post mortem analysis on the impact of the October 20th AWS outage on various chains. L1's such as Solana prove to be the least dependent on AWS, with L2's like Base being the most dependent.

"Key findings from the outage include the resilience of major Layer 1 (L1) blockchains like Ethereum, Solana, and Avalanche, which maintained 100% uptime despite varying levels of AWS dependency [Decrypt, CryptoSlate, Brave New Coin]. In contrast, Layer 2 (L2) networks such as Base, Arbitrum, Optimism, Polygon, Linea, and Scroll experienced degraded performance, with throughput reductions ranging from -8% to -25% [Decrypt, CryptoSlate]. The outage also caused specific disruptions in the crypto ecosystem, including MetaMask users reporting zero balances due to Infura outages [Decrypt], and Coinbase experiencing login failures and trading halts [Fortune Crypto, CNBC]."

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