Base Outage History

47 incidents recorded over the last 365 days, 24 of them resolved, 1 still open. Durations are measured from when PulsAPI first saw the problem to when it cleared, which is usually longer than the vendor's own figure.

Live Base status100.00% uptime history

Every Recorded Base Incident

Base incidents, newest first, with date, duration and status.
DateIncidentDurationStatus
Nov 5, 2026Mainnet: Base Denim Upgrade - November 5thOn Thursday, November 5th at 18:00 UTC (Unix timestamp 1793901600), Base Mainnet will undergo the Denim upgrade. Base Mainnet is expected to remain operational during the upgrade window. Operators of Base Mainnet…2h 0mScheduled
Nov 2, 2026Delayed transaction inclusion on Base MainnetA fix has been implemented and we are monitoring the results.—Investigating
Oct 29, 2026Delayed transaction inclusion on Base MainnetThis incident has been resolved.48h 3mResolved
Oct 24, 2026Delayed transaction inclusionUnexpected mempool congestion lead to some transactions being delayed/dropped from the mempool.0 minResolved
Oct 23, 2026Base Sepolia public RPC delayed responsesThis incident has been resolved.1h 1mResolved
Oct 21, 2026Sepolia Testnet: Base Denim Upgrade - October 21stScheduled maintenance is currently in progress. We will provide updates as necessary.2h 0mScheduled
Oct 9, 2026Base Mainnet proposals haltedThis incident has been resolved.5h 27mResolved
Oct 8, 2026mainnet.base.org public RPC changes: October 8th, 2026The scheduled maintenance has been completed.24h 0mScheduled
Oct 5, 2026V1 Node Snapshot Deprecation: October 5th, 2026The scheduled maintenance has been completed.24h 0mScheduled
Sep 30, 2026Mainnet: Base Cobalt Upgrade - September 30thThe scheduled maintenance has been completed.2h 0mScheduled
Sep 23, 2026Sepolia Testnet: Base Cobalt Upgrade - September 23rdThe scheduled maintenance has been completed.2h 0mScheduled
Jul 28, 2026Base Mainnet Safe head delayedSafe head is progressing normally2h 2mResolved
Jul 21, 2026Reduced Capacity on Base Mainnet Flashblocks Websocket streamBetween UTC 19:50 and 20:42, Base Mainnet experienced reduced capacity on the Flashblocks websocket stream. Clients likely experienced delays in receiving messages and rate limits when connecting.-84 minResolved
Jun 25, 2026Mainnet: Base Beryl Upgrade - June 25thThe scheduled maintenance has been completed.2h 0mScheduled
Jun 25, 2026Base Mainnet Chain StallBlock production has been succesfully progressing for Base Mainnet. A detailed postmortem will be be published to outline the technical root cause.28h 0mResolved
Jun 18, 2026Sepolia Testnet: Base Beryl Upgrade - June 18thThe scheduled maintenance has been completed.2h 0mScheduled
Jun 12, 2026Base Mainnet p2p peering stabilityThis incident has been resolved.235h 5mResolved
Jun 2, 2026Base Mainnet Periodic Flashblocks InstabilityThe instability has been addressed and resolved. Node operators who were affected are recommended to upgrade to v1.1.1 of base/base which contains stability improvements and bug fixes…474h 2mResolved
May 29, 2026Base Mainnet Withdrawal DelayThis incident has been resolved.35h 43mResolved
May 28, 2026Mainnet: Base Azul Upgrade - May 28thThe scheduled maintenance has been completed.2h 0mScheduled
May 13, 2026Delayed TransactionsThis incident has been resolved.12h 19mResolved
May 10, 2026Elevated latency on Sepolia RPCThis incident has been resolved.70h 21mResolved
Apr 30, 2026Node Peering Stability on Base Testnet and MainnetThe discv5 protocol ID migration has been completed. It can be difficult to find a peer that isn't full on peers already. We are working with the Reth team to continue improving the ability to find…838h 27mResolved
Apr 21, 2026Mainnet RPC UpgradeThe scheduled maintenance has been completed.1h 0mScheduled
Apr 20, 2026Sepolia Testnet: Base Upgrade v1 - April 20thThe scheduled maintenance has been completed.2h 0mScheduled
Apr 16, 2026Sepolia Testnet Unsafe Head StalledBlock production has resumed on Sepolia testnet.49 minResolved
Apr 10, 2026Sepolia safe head delayedThis is now mitigated. Safe head is progress normally for Sepolia Testnet1h 50mResolved
Apr 7, 2026Sepolia Testnet: Flashblocks downThis incident has been resolved.17 minResolved
Mar 25, 2026Base Mainnet Gas Limit Increase from 187.5Mgas/s to 200Mgas/sThe scheduled maintenance has been completed.4h 0mScheduled
Mar 24, 2026Base Mainnet Flashblocks DegradedThis incident has been resolved.193h 41mResolved
Mar 9, 2026Flashblock websocket connection errorsThis incident has been resolved.1h 25mResolved
Feb 19, 2026Base Mainnet minimum base fee increaseThe scheduled maintenance has been completed.1h 30mScheduled
Feb 18, 2026Sepolia block building issueThis incident has been resolved.11h 25mResolved
Feb 10, 2026Base Mainnet Upgrade 18The scheduled maintenance has been completed.2h 0mScheduled
Feb 5, 2026Mempool upgradeThe scheduled maintenance has been completed.2h 0mScheduled
Feb 5, 2026Transaction Inclusion DelaysStability of block production and transaction inclusion are back to acceptable levels. We have deployed and confirmed reliability of several improvements to our block builder and transaction processing infrastructure…1125h 51mResolved
Feb 3, 2026Base Mainnet minimum base fee increaseThe scheduled maintenance has been completed.1h 30mScheduled
Jan 22, 2026High Rate of Transaction Drops and Transaction Inclusion Delays## Postmortem: Transaction Drops and Inclusion Delays ## Summary On Saturday, January 31, 2026 between 19:17 and 20:41 UTC \(2 hours and 26 minutes\), Base Mainnet experienced a period of high transaction inclusion…215h 32mResolved
Jan 22, 2026Base Mainnet minimum base fee increaseThe scheduled maintenance has been completed.1h 30mScheduled
Jan 20, 2026Periodically delayed block building on Base MainnetBase mainnet is experiencing periodically delayed blocks due to volatile activity. We're actively monitoring and working to improve the consistency of block building performance. Between 14:45 and 15:10 UTC on…-81 minResolved
Dec 18, 2025Base Mainnet minimum base fee and gasLimit increaseThe scheduled maintenance has been completed.1h 0mScheduled
Dec 12, 2025Delayed TransactionsBase experienced a high rate of missed blocks. Transactions sent during missed blocks are delayed until the next successful block. The issue has resolved itself, and we've prepared a mitigation to put in place if the…-3908 minResolved
Dec 2, 2025Base Mainnet Jovian upgrade on December 2nd at 16:00:01 UTCThe scheduled maintenance has been completed.30 minScheduled
Nov 19, 2025Jovian Upgrade on Base Sepolia Testnet November 19th at 16:00:01 UTCThe scheduled maintenance has been completed.1h 0mScheduled
Nov 12, 2025Base Mainnet Gas Limit increase from 125Mgas/s to 150Mgas/sThe scheduled maintenance has been completed.2h 0mScheduled
Nov 6, 2025Flashblocks Degraded PerformanceFlashblocks building performance has has returned to expected values.127h 31mResolved
Nov 6, 2025Base Mainnet Gas Limit increase from 100Mgas/s to 125Mgas/sThe scheduled maintenance has been completed.2h 0mScheduled

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How to Read This Base Incident Log

Each row is an incident PulsAPI observed, not a summary written afterwards. The duration is wall-clock time between the first failing check and the first clean one, so it includes the window before Base acknowledged anything. Vendor post-mortems typically measure from acknowledgement, which is why their numbers are usually shorter.

Incidents still open have no duration yet and are listed as ongoing rather than being given a running total. The archive covers the last 365 days; anything older has aged out of the window rather than never having happened.

The longest single Base outage in this window ran 46d 21h, against a mean recovery of 3d 9h. If you depend on Base in a customer-facing path, the longest figure is the one to design around. The mean is what happens on a normal bad day; the maximum is what happens on the worst one.