Scheduled maintenance is currently in progress. We will provide updates as necessary.
Posted Jul 16, 2026 - 07:30 UTC
Scheduled
We are upgrading our Stacks Mainnet infrastructure to node version v4.0.0 and API version v9.0.0. The node release delivers bugfixes and improvements to ensure more consistent block production. This node upgrade is mandatory ahead of the Stacks 4.0 hard fork, activating at block height 960,230, expected around July 29, 2026 at 13:00 UTC.
The API upgrade to v9.0.0 adds forward support for pox-5 (Bitcoin Staking) and the upcoming Stacks 4.0 hard fork, and introduces a new cursor-paginated /extended/v3 API surface.
During the maintenance window, brief interruptions to RPC/API availability may occur. RPC/API Changes:
Starting at hard fork activation, the network will reject blocks containing transactions with non-normalized "high S" secp256k1 signatures. Users submitting raw/custom-signed transactions should ensure signatures are normalized to avoid rejection. New /extended/v3 endpoints are now available for transactions, blocks, principals, and staking (pox-5) data, offering improved performance and pagination for large result sets. A number of legacy /extended/v1 and /extended/v2 endpoints are now deprecated. They remain functional but will return a Warning HTTP header and may be throttled; they will be shut down at a later date to be announced. The Rosetta API implementation has been removed. Users relying on Rosetta-compatible access should migrate to the new Stacks Mesh API.