> ## Documentation Index
> Fetch the complete documentation index at: https://docs.etherscan.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Archived Chains

> Chains that have shut down and are no longer supported by the Etherscan API, with historical address transaction data available on request.

When a chain shuts down, the Etherscan API stops serving it. Historical address transaction data for the chains below remains available on request when API support ends.

| Chain | Chain ID | API support ends |
| - | - | - |
| Blast Mainnet | 81457 | October 31, 2026 |

## Request access

Contact us at [apisupport@etherscan.io](mailto:apisupport@etherscan.io) with the chain you need. Our team will process your request accordingly.

For chains the API currently supports, see [Supported chains](/supported-chains).


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