Static KNOWN_NETWORKS 

pub static KNOWN_NETWORKS: &[NetworkInfo]

A static array of well-known blockchain networks.

This array contains a registry of well-known blockchain networks for improved developer experience and x402 protocol v1 compatibility, organized by ecosystem (EVM networks first, then Solana networks). Each entry includes the network’s human-readable name, CAIP-2 namespace, and chain reference.

x402 v1 Protocol Relevance

This registry represents the set of blockchain networks that were known and supported in x402 v1. For x402 v2 and beyond, the protocol is designed to work with any CAIP-2 chain ID without requiring a predefined registry.

The array is used to populate the lazy-initialized lookup hashmaps:

• NAME_TO_CHAIN_ID for name-based lookups
• CHAIN_ID_TO_NAME for ChainId-based lookups

Developer Experience Benefits

Despite being v1-focused, this registry continues to provide value by:

• Enabling convenient network name lookups via ChainId::from_network_name()
• Providing human-readable network names via ChainId::as_network_name()
• Serving as a reference for commonly used blockchain networks