RPC Visibility Report - June 2026
A monthly look at Ethereum RPC visibility across monitored regions: where blocks appeared first, how large regional timing gaps became and when freshness thresholds were crossed.
New metric: stale-view exposure
This report introduces stale-view exposure: how often a region lagged the fastest observed region for the same block by more than a threshold.
Read the explainer →Key Findings
- US-East remained the leading first-seen region, accounting for 41.95% of blocks across 6 monitored regions, about 2.5x the equal-share baseline.
- Regional first-seen share shifted materially month over month: EU-West fell by 13.12 percentage points, while AP-Northeast gained 11.67 points and EU-Central gained 5.42 points.
- Typical regional visibility improved: the median first-to-last regional gap decreased from 130ms to 98ms, while p95 improved from 261ms to 211ms and p99 improved from 324ms to 276ms.
- The extreme tail worsened: the worst first-to-last regional visibility gap increased from 7.85s last month to 22.74s this month, despite stronger median, p95, and p99 performance.
- Severe stale-view exposure remained rare: every monitored region stayed below 0.02% of observed blocks above the 500ms threshold.
1. Regional First-Seen
For each block, QuantLoop reports which monitored region observed the block first.
How to read thisExpandCollapse
This section answers: which monitored region observed each new Ethereum block first?
Because each region has multiple monitored providers, QuantLoop uses the earliest observation recorded inside each region.
Values labeled "pts vs last month" show the percentage-point change from the previous monthly report.
2. Elevated Regional Lag
Time windows where one region repeatedly received blocks later than the fastest region.
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This section highlights detected lag windows where one region repeatedly received blocks later than the fastest region.
Each row covers one detected lag window. QuantLoop counts how many blocks in that window were delayed by more than 250ms for the listed region.
Share shows how much of the window was affected. Higher share means more persistent lag.
20 / 75 blocks were delayed >250ms
P95 lag
460ms
Max lag
2.44s
57 / 300 blocks were delayed >250ms
P95 lag
344ms
Max lag
2.81s
53 / 300 blocks were delayed >250ms
P95 lag
406ms
Max lag
2.05s
| Rank | Window | Region | Blocks delayed | Share | P95 lag | Max lag |
|---|---|---|---|---|---|---|
| #1 | 2026-06-10 19:41-19:56 UTC | US-West | 20 / 75 >250ms | 26.67% | 460ms | 2.44s |
| #2 | 2026-06-13 17:58-18:58 UTC | US-West | 57 / 300 >250ms | 19.0% | 344ms | 2.81s |
| #3 | 2026-06-05 13:15-14:15 UTC | US-West | 53 / 300 >250ms | 17.67% | 406ms | 2.05s |
3. Stale-View Exposure
How often each monitored region lagged the earliest regional observation by more than 250ms or 500ms.
How to read thisExpandCollapse
This section answers: how often did each region fall materially behind on block visibility?
For each block, QuantLoop compares each region's earliest observation with the earliest regional observation of that same block.
| Region | >250ms | >500ms |
|---|---|---|
| US-East | 0.231% | 0.008% |
| EU-West | 0.143% | 0.007% |
| EU-Central | 0.261% | 0.018% |
| AP-Northeast | 0.261% | 0.010% |
| US-Central | 0.331% | 0.014% |
| US-West | 1.637% | 0.017% |
4. Missing Observations
For each region, QuantLoop measures how often expected provider observations were missing.
How to read thisExpandCollapse
This section measures completeness, not latency.
For each canonical block and region, QuantLoop expects one observation from each monitored provider. In this report, that means 7 expected provider observations per block per region.
- Missing observation: an expected provider observation that was not recorded inside the report window.
- Missing observation rate: the share of expected observations that were not recorded. Lower values mean more complete provider visibility.
A missing observation is not an outage label. It only means QuantLoop did not record the expected observation during the report window.
US-East
Missed obs.
67
Missing rate
0.004%
EU-West
Missed obs.
57
Missing rate
0.004%
EU-Central
Missed obs.
585
Missing rate
0.039%
AP-Northeast
Missed obs.
422
Missing rate
0.028%
US-Central
Missed obs.
474
Missing rate
0.032%
US-West
Missed obs.
559
Missing rate
0.036%
| Region | Block observations missed | Missing observation rate |
|---|---|---|
| US-East | 67 | 0.004% |
| EU-West | 57 | 0.004% |
| EU-Central | 585 | 0.039% |
| AP-Northeast | 422 | 0.028% |
| US-Central | 474 | 0.032% |
| US-West | 559 | 0.036% |