Summary
On May 17, 2026 at 23:29:43 UTC we recorded a structured two-wave MEV attack on Base. Our sequencer RTT probe (2-second intervals, DO NYC1) detected the attack 27 seconds before the revert ratio spiked.
Timeline — second-by-second data
Wave 1:
| Time UTC |
Base P99 |
Revert Ratio |
| 23:29:40 |
52ms |
~2% (normal) |
| 23:29:43 |
739ms |
~2% |
| 23:30:10 |
791ms |
56% |
| 23:31:10 |
1130ms |
56% |
| 23:31:12 |
59ms |
56% |
Between waves (23:33–23:36):
- P99 remains 200–248ms (elevated baseline, not normal)
- Revert ratio 11–17%
Wave 2 + Full Stall:
| Time UTC |
Base P99 |
Revert Ratio |
| 23:39:35 |
64ms |
61.36% |
| 23:41:17 |
398ms |
~28% |
| 23:41:52 |
5000ms |
— |
| 23:42:38 |
121ms |
— |
| 23:42:47 |
5000ms |
— |
Total duration: ~13 minutes of degraded conditions.
Key Finding
P99 RTT is a 27-second leading indicator for revert ratio spikes.
Standard RPC endpoints report state after block processing. A continuous low-latency probe to the sequencer detects mempool pressure building at the ingress layer — before it manifests as transaction failures.
Why this matters for Moonwell
During the 23:30–23:42 window, any liquidation or supply transaction submitted without awareness of sequencer state was executing into a degraded network. The P99 signal gives a ~27 second window to pause liquidation bots or adjust gas strategy.
Data source
Phoenix Zero RTT Oracle — continuous 2s probes to Base, Arbitrum, Optimism, ZKSync from DO NYC1.
Public feed (5-min delayed, free): https://rtt.phoenix-ai.work/api/public-feed
Dashboard: https://phoenix-zero.vercel.app
If your DevOps or keeper team wants real-time access (0ms delay) as a pre-flight signal: aleksandrkent64@gmail.com
Summary
On May 17, 2026 at 23:29:43 UTC we recorded a structured two-wave MEV attack on Base. Our sequencer RTT probe (2-second intervals, DO NYC1) detected the attack 27 seconds before the revert ratio spiked.
Timeline — second-by-second data
Wave 1:
Between waves (23:33–23:36):
Wave 2 + Full Stall:
Total duration: ~13 minutes of degraded conditions.
Key Finding
P99 RTT is a 27-second leading indicator for revert ratio spikes.
Standard RPC endpoints report state after block processing. A continuous low-latency probe to the sequencer detects mempool pressure building at the ingress layer — before it manifests as transaction failures.
Why this matters for Moonwell
During the 23:30–23:42 window, any liquidation or supply transaction submitted without awareness of sequencer state was executing into a degraded network. The P99 signal gives a ~27 second window to pause liquidation bots or adjust gas strategy.
Data source
Phoenix Zero RTT Oracle — continuous 2s probes to Base, Arbitrum, Optimism, ZKSync from DO NYC1.
Public feed (5-min delayed, free): https://rtt.phoenix-ai.work/api/public-feed
Dashboard: https://phoenix-zero.vercel.app
If your DevOps or keeper team wants real-time access (0ms delay) as a pre-flight signal: aleksandrkent64@gmail.com