Major incident

Avalanche: Fuji(Testnet) C-Chain Helicon Block Indexing

Affected: Explorer

Current status of Avalanche: Operational — live Avalanche status

Timeline

1. Jul 28, 2026, 15:09 UTC
   investigating
   We are currently investigating delayed C-Chain block indexing on Fuji (Testnet) after the Helicon activation. This impacts Fuji (Testnet) ONLY, Mainnet indexing is fully operational.
2. Jul 28, 2026, 15:10 UTC
   investigating
   We are continuing to investigate this issue impacting Fuji(Testnet) C-Chain block ingestion.
3. Jul 28, 2026, 15:31 UTC
   investigating
   We are continuing to investigate this issue impacting Fuji(Testnet) C-Chain block ingestion.
4. Jul 28, 2026, 15:46 UTC
   investigating
   We are continuing to investigate this issue impacting Fuji(Testnet) C-Chain block ingestion.
5. Jul 28, 2026, 15:51 UTC
   investigating
   We are continuing to investigate this issue.
6. Jul 28, 2026, 15:52 UTC
   investigating
   We are continuing to investigate this issue.
7. Jul 28, 2026, 16:08 UTC
   identified
   The issue has been identified and a fix is being implemented.
8. Jul 28, 2026, 16:34 UTC
   monitoring
   A fix has been implemented and we are monitoring the results.
9. Jul 28, 2026, 17:13 UTC
   resolved
   This incident has been resolved.

Updates as published by Avalanche (original).