RED-LIQ-2026-v1: A public benchmark of 18,750 Ethereum Aave V3 liquidations paired with a 4-chain lending-utilization panel

RED-LIQ-2026-v1 is a public benchmark dataset pairing an Ethereum Aave V3 liquidation record with a four-chain lending-utilization panel. The liquidation record holds 18,750 on-chain liquidation calls spanning three years (2023: 7,095; 2024: 7,905; 2025: 0 gap; 2026: 3,750), and the utilization panel covers Ethereum, Arbitrum, Base, and Polygon at roughly 30-minute resolution over a continuous 2026 window (2026-05-08 to 2026-07-05, 2,694 snapshots per chain). The 3,750 liquidations dated 2026 fall inside the utilization window and constitute an analysis-ready paired subset; the 2023-2024 liquidations are provided as a historical record and have no contemporaneous utilization data in this release. Headline descriptive findings: liquidation activity is highly concentrated among liquidators (Herfindahl-Hirschman Index 0.071, Gini approximately 0.83, top-5 liquidators account for 46% of all liquidations). Cross-chain utilization shows a two-cluster structure: Arbitrum utilization moves counter to both Ethereum (correlation -0.19) and Polygon (-0.31), while Ethereum and Polygon co-move positively (+0.67). Arbitrum is the L2 outlier against a broader ETH-Polygon co-cycle. This is a task-specific complement to the six-chain Aave event infrastructure of Fan and Sun (2025, arXiv:2512.11363), extending coverage into the post-Aave-V3.3 (October 2025) era with a pre-paired analysis-ready panel. The dataset is descriptive and makes no cross-chain causal claim. Ships with fixed-seed reproducibility script, SHA-256 integrity manifest, complete field-level schema documentation, and CC-BY-4.0 license. Part of the RED-2400 v2 corpus (five-dataset Solana/DeFi microstructure benchmark family). Companion corpus paper "A Multi-Venue Solana/DeFi Microstructure Data Corpus: The RED-2400 Family v2" is forthcoming (SSRN preprint and arXiv q-fin.TR preprint; DOIs pending).