provides metadata for networkIDs and chainIDs
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rayedsikder 0d2d1c34d6
Update explorer link for Celo Testnet Alfajores (#3518)
* Update explorer link for Celo Testnet Alfajores

* Update _data/chains/eip155-44787.json

Co-authored-by: ligi <>


Co-authored-by: ligi <>
2 weeks ago
.ci Add test stage 3 years ago
.github Update deploy.yml (#3007) 4 months ago
_data Update explorer link for Celo Testnet Alfajores (#3518) 2 weeks ago
gradle/wrapper Use gradle 8.0.2 (#2367) 7 months ago
httpsloader Add initial httpsloader (#2104) 9 months ago
model Update Kotlin and KSP (#3242) 2 months ago
processor Bump org.apache.xmlgraphics:batik-rasterizer-ext from 1.16 to 1.17 (#3365) 1 month ago
tools Make sure the path is correct (#2341) 7 months ago
website@aeb8bb0d05 Update website (#3424) 1 month ago
.gitignore add icplaza chainnet (#2678) 5 months ago
.gitmodules Add chainlist website as submodule 8 months ago
.jitpack.yml Tell jitpack to use openjdk 11 (#2105) 9 months ago
.prettierignore Added Prettier and formatted existing JSON files (#1501) 1 year ago
.prettierrc.json Added Prettier and formatted existing JSON files (#1501) 1 year ago
LICENSE Initial commit 5 years ago Updates pulsechain testnets (#2639) 6 months ago
build.gradle Bump com.github.ben-manes:gradle-versions-plugin from 0.47.0 to 0.48.0 (#3462) 4 weeks ago
gradlew Use gradle 8.0.1 (#2306) 8 months ago
gradlew.bat Use gradle 7.6 10 months ago Clean up the (#2441) 7 months ago
settings.gradle.kts Add initial httpsloader (#2104) 9 months ago

EVM-based Chains

The source data is in _data/chains. Each chain has its own file with the filename being the CAIP-2 representation as name and .json as extension.


  "name": "Ethereum Mainnet",
  "chain": "ETH",
  "rpc": [
  "faucets": [],
  "nativeCurrency": {
    "name": "Ether",
    "symbol": "ETH",
    "decimals": 18
  "features": [{ "name": "EIP155" }, { "name": "EIP1559" }],
  "infoURL": "",
  "shortName": "eth",
  "chainId": 1,
  "networkId": 1,
  "icon": "ethereum",
  "explorers": [{
    "name": "etherscan",
    "url": "",
    "icon": "etherscan",
    "standard": "EIP3091"

when an icon is used in either the network or an explorer there must be a json in _data/icons with the name used (e.g. in the above example there must be a ethereum.json and a etherscan.json in there) - the icon jsons look like this:

      "url": "ipfs://QmdwQDr6vmBtXmK2TmknkEuZNoaDqTasFdZdu3DRw8b2wt",
      "width": 1000,
      "height": 1628,
      "format": "png"


  • the URL must be an IPFS url that is publicly resolvable
  • width and height are positive integers
  • format is either "png", "jpg" or "svg"

If the chain is an L2 or a shard of another chain you can link it to the parent chain like this:

  "parent": {
   "type" : "L2",
   "chain": "eip155-1",
   "bridges": [ {"url":""} ]

where you need to specify type 2 and the reference to an existing parent. The field about bridges is optional.

You can add a status field e.g. to deprecate (via status deprecated) a chain (a chain should never be deleted as this would open the door to replay attacks) Other options for status are active (default) or incubating


There are also aggregated json files with all chains automatically assembled:


  • the shortName and name MUST be unique - see e.g. EIP-3770 on why
  • if referencing a parent chain - the chain MUST exist in the repo
  • if using a IPFS CID for the icon - the CID MUST be retrievable via ipfs get - not only through some gateway (means please do not use pinata for now)
  • for more constraints you can look into the CI

Collision management

We cannot allow more than one chain with the same chainID - this would open the door to replay attacks. The first pull request gets the chainID assigned. When creating a chain we can expect that you read EIP155 which states this repo. All pull requests trying to replace a chainID because they think their chain is better than the other will be closed. The only way to get a chain reassigned is when the old chain gets deprecated. This can e.g. be used for testnets that are short-lived. But then you will get the redFlag "reusedChaiID" that should be displayed in clients to warn them about the dangers here.

PR verification

Before submitting a PR, please verify that checks pass with:

$ ./gradlew run

9 actionable tasks: 9 executed





  • EIP-155
  • EIP-3014
  • EIP-3770
  • EIP-4527

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