Maintenance

Polkadot-assethub Substrate API will is migrating.

• No outage is expected.
• Change: "useRpcBlock" feature

Official Migration Docs:

• https://github.com/paritytech/substrate-api-sidecar/blob/master/guides/ASSET_HUB_MIGRATION.md

Cosmos (Mainnet) is undergoing a mandatory update:

• https://www.mintscan.io/cosmos/proposals/1016
• https://github.com/cosmos/gaia/releases/tag/v25.2.0

Service availability may be temporarily affected until the update is fully deployed across all nodes and services.

Polygon Amoy (Testnet) is undergoing a Hard Fork on Thursday, Nov 20th at 10.00 UTC (block 29287400)

• https://forum.polygon.technology/t/bor-v2-5-0-and-erigon-v3-3-0-for-amoy-and-mainnet/21413
• https://github.com/0xPolygon/erigon/releases/tag/v3.3.0
• https://github.com/0xPolygon/bor/releases/tag/v2.5.0

No downtime is expected

Polygon Mainnet is undergoing a Hard Fork on Tuesday, Dec 9th at 10.00 UTC for Madhugiri AND MadhugiriPro (block 80084800)

• https://forum.polygon.technology/t/bor-v2-5-0-and-erigon-v3-3-0-for-amoy-and-mainnet/21413
• https://github.com/0xPolygon/erigon/releases/tag/v3.3.0
• https://github.com/0xPolygon/bor/releases/tag/v2.5.0

No downtime is expected

The Cronos Foundation has announced a breaking Upgrade with a minimum estimated downtime of ~30 min. Affected services:

• The upgrade is scheduled at block height 45062800
• Cronos EVM Mainnet block production;
• Cronos EVM Mainnet Explorer (https://explorer.cronos.org/);
• Cronos EVM Mainnet IBC transactions;
• Cronos EVM Mainnet endpoints (https://evm.cronos.org/ , https://rpc.cronos.org/...);
• https://github.com/crypto-org-chain/cronos/releases/tag/v1.6.1

Polygon Amoy (Testnet) will have a Hard Fork at block height 31890000. The expected times for the hardfork is on Wed, Jan 07, 2026, 12:00 PM UTC.

• https://forum.polygon.technology/t/bor-v2-5-6-beta6-and-erigon-v3-3-6-beta3/21537
• No outage is expected

Polygon (Mainnet) will have a Hard Fork at block height 81424000. The expected times for the hardfork is on Jan 09, 2026, 02:00 PM UTC

• https://forum.polygon.technology/t/bor-v2-5-6-and-erigon-v3-3-6/21547
• No outage is expected

Solana (Mainnet) requires an urgent update to v3.0.14. Pending confirmation from Solana Foundation to execute it immediately.

• https://x.com/SolanaStatus/status/2009875480229617696
• https://coingape.com/solana-pushes-critical-validator-update-to-protect-mainnet-stability/
• Outages are not expected. However, there can be intermittent errors across methods as upstream nodes are updated.

Polygon (Mainnet) is undergoing an urgent update for Heimdall v0.5.5 requested by Polygon Foundation.

• https://github.com/0xPolygon/heimdall-v2/releases/tag/v0.5.5

Berachain (Mainnet) will undergo an upgrade

• No downtime is expected. However, there may be temporary service disruptions

BSC (Mainnet) will undergo the Fermi Hard Fork upgrade

• https://www.bnbchain.org/en/blog/fermi-hard-fork-accelerates-bsc-to-0-45-second-block-times
• No downtime is expected. However, there may be temporary service disruptions