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💥 v12 API Breaking changes

https://docs.blockscout.com/blockscout-v12-0-0-api-updates-and-breaking-changes

🚀 Features

  • Expose rollup L1 data fee in the Etherscan-compatible API (#14954)
  • Add JSON-RPC-compatible tokenholderlist, tokenholdercount, tokeninfo endpoints (#14935)

🐛 Bug Fixes

  • Fix log join in optimism withdrawal list (#14955)
  • Tolerate malformed content-type headers in NFT media type detection (#14949)
  • Widen withdrawals.validator_index to bigint for ePBS builder withdrawals (#14948)
  • Run token instance media type fetcher only on indexer nodes (#14936)

⚡ Performance

  • Optimize scam tokens filtering (#14952)
  • Merge address count and coin balance sum counters into one query (#14934)

⚙️ Miscellaneous Tasks

  • Refactor FillLogsOptimizedFields to iterate over logs instead of blocks (#14956)
  • Increase default concurrency of coin balance fetcher (#14953)
  • Update Hackney 1.18 -> 4.0 (#14947)
  • Bump phoenix to v1.6.17 (#14946)
  • Remove deprecated blocks join in token_transfers_query_function (#14700)
  • Migrate to Elixir 1.20.x (#14932)

📘 Updated Swagger Documentation

Swagger files for version 12.0.2: https://github.com/blockscout/swaggers/tree/master/blockscout/12.0.2

💡 New environment variables

New environment variables list | Variable | Description | Parameters | |-----------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------| | `INDEXER_TOKEN_INSTANCE_MEDIA_TYPE_INIT_QUERY_LIMIT` | Limit on the number of token instances loaded into the media type fetcher queue during each init pass. Implemented in [#14936](https://github.com/blockscout/blockscout/pull/14936). | Version: v12.0.2\+
Default: `1000`
Applications: Indexer | | `CACHE_ADDRESS_AGGREGATES_PERIOD` | Refresh period for the combined addresses count and coin balance sums. [Time format](/setup/env-variables/backend-env-variables#time-format). Implemented in [#14934](https://github.com/blockscout/blockscout/pull/14934). | Version: v12.0.2\+
Default: `1h`
Applications: API, Indexer |

⛔ Deprecated environment variables

Deprecated environment variables list | Variable | Description | Default | Version | Need recompile | Deprecated in Version | | -------- | ----------- | ------- | ------- | -------------- | --------------------- | | Deprecated `CACHE_ADDRESS_COUNT_PERIOD` | Interval for restarting the task that calculates the total number of addresses. Replaced with `CACHE_ADDRESS_AGGREGATES_PERIOD`, which refreshes the addresses count and coin balance sums together. Removed in [#14934](https://github.com/blockscout/blockscout/pull/14934). | `30m` | v8.0.0\+ | | v12.0.2+ | | Deprecated `CACHE_ADDRESS_SUM_PERIOD` | Time to live of addresses sum (except burn address) cache. Replaced with `CACHE_ADDRESS_AGGREGATES_PERIOD`, which refreshes the addresses count and coin balance sums together. Removed in [#14934](https://github.com/blockscout/blockscout/pull/14934). | `1h` | v4.1.3\+ | | v12.0.2+ |
Source: README.md, updated 2026-10-16