toCaip2ChainId()

toCaip2ChainId(chainId): `${string}:${string}` | undefined

Turns a chain identifier into a CAIP-2 chain ID: EVM chain numbers and their decimal strings become eip155:<number>, every Solana form accepted by getSolanaChainId becomes its genesis-hash ID, and a valid CAIP-2 chain ID is returned as it is.

Parameters

chainId

string | number

An EVM chain number, a Solana chain in any form, or a CAIP-2 chain ID.

Returns

`${string}:${string}` | undefined

The CAIP-2 chain ID, or undefined when the value cannot be read as one.

Example


toCaip2ChainId(8453); // "eip155:8453"
toCaip2ChainId('solana:devnet'); // "solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1"
toCaip2ChainId('base'); // undefined