## Summary
Avalanche mainnet Helicon hard fork activated 2026-09-22 15:00 UTC.
**Fixes:** C-Chain config `api-max-duration` duration string format required by avalanchego v1.15.0. Changes from numeric `0` to string `'0s'`.
## Verification
- Must deploy WITH version bump PR (vibe-node#issue-5034) for node compatibility
- Commit: 53b959842172
- Both changes required together: version v1.15.0+ + config format fix
vibe-node issue #5034
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Summary
Avalanche mainnet Helicon hard fork activated 2026-09-22 15:00 UTC.
Fixes: C-Chain config
api-max-durationduration string format required by avalanchego v1.15.0. Changes from numeric0to string'0s'.Verification
53b9598421vibe-node issue #5034
🤖 Generated with Claude Code
merge-bot (del-018): classified B (hand-maintained rpc file(s), single scope). Auto-merge after a 72h objection window - comment 'hold' to block.