Scenario
Round-trip latencies for chained requests eth_getBlockByNumber(latest, false) and eth_getLogs(hash) with start-to-start throttling of (at least) 1100 ms for every request.
Also, block number consistency with block availability and block age. The block propagation comparison is conservative and latency-agnostic.
Of the possible 31 regions, 8 were selected for data collection: Ireland, Zaragoza, London, Paris, Frankfurt, Zurich, Milan, and Stockholm.
Each location probe breaks its processing loop if / when the endpoint response is too-many-requests, a.k.a. HTTP code 429 etc. Also, codes 401 and 403.
At the time of the report generation: 16 of 16 datasets were available from 8 selected regions x 2 endpoints.
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Findings
| Endpoint | Lagging | Unique | Lowest | Arrival Tms | Arrival Region | Highest | Arrival Tms | Arrival Region |
|---|---|---|---|---|---|---|---|---|
| A. arb-mainnet.g.Alchemy.com | 0 | 25 | 469,757,749 | 1,780,524,607,278 | Frankfurt / AWS | 469,757,864 | 1,780,524,636,145 | Ireland / AWS |
| B. arbitrum-one.PublicNode.com | 23 | 41 | 469,757,746 | 1,780,524,607,303 | Ireland / AWS | 469,757,864 | 1,780,524,636,048 | Stockholm / AWS |
We detected 23 lagging block-number responses whose sendTms, arrivalTms and number prove the endpoint was behind in the respective region.
E.g. on arrivalTms=1,780,524,616,141 in London / AWS, we received number 469,757,784 from A. arb-mainnet.g.Alchemy.com. Afterwards, on sendTms=1,780,524,616,381 we dispatched a request to B. arbitrum-one.PublicNode.com, which returned lower number 469,757,783 at arrivalTms=1,780,524,616,411. Therefore, B. arbitrum-one.PublicNode.com was lagging because it was returning lower number 469,757,783 well after A. arb-mainnet.g.Alchemy.com advanced to 469,757,784.
Summary
Global and continental aggregations by endpoint and method(s) depend on completeness of data in the details.
Details
Latencies exclude one warmup request per endpoint in each region. Additional columns are visible when you scroll to the right.
Errors
Info about errors incl. 429. Up to 4 examples per problem category, per endpoint, per region. Scenario-derived availability notes may also appear.