# ethereum-lists/chains

provides metadata for chains

Repository: https://github.com/ethereum-lists/chains
Canonical: https://ross.abutalabs.com/products/chains
Homepage: https://chainid.network
Language: Kotlin
License: MIT
License Family: permissive
Topics: ethereum, evm, chainid, eip155, chains, hacktoberfest
Last push: 2026-08-26T06:52:13+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 2813, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 9822, forks 8116 (observed 2026-08-28T04:10:37.368711+00:00)

## What it is
A community-maintained dataset of metadata for EVM-based blockchain networks, keyed by CAIP-2 chain identifiers. It provides chain IDs, RPC endpoints, native currency info, explorers, and icons, aggregated into downloadable JSON files at chainid.network.

## Use cases
- look up the chain ID for an EVM network
- get RPC endpoints and currency metadata for a blockchain
- add a new EVM chain to a wallet
- avoid chain ID collisions when launching a network
- download a full list of EVM chains as JSON

## When to choose
- you need canonical EIP-155 chain IDs and network metadata for wallets or dapps
- you want aggregated, up-to-date chain data via a simple JSON endpoint

## When to avoid
- you need non-EVM chain data like Bitcoin or Solana
- you need real-time RPC health or node status monitoring

## Facets
- artifact type: dataset
- maturity: active
- function: sdk, developer-tools, data-generation
- domain: blockchain, developer-tools
- platform: cross-platform
- tags: ethereum, evm, chainid, eip155, chain-metadata, chainlist, json-dataset, cryptocurrency

## Member repositories
- ethereum-lists/chains (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:37.368711+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:20:56.884068+00:00, confidence not recorded.
  - readme: https://github.com/ethereum-lists/chains (fetched 2026-08-28T04:10:37.368711+00:00, sha 76354d8c9c0b)
  - homepage: https://chainid.network (fetched 2026-08-29T08:20:26.509866+00:00, sha 5526cc3b8e45)
- Data as of 2026-08-30T08:39:29.467469+00:00.