Struct PreferChain 

pub struct PreferChain(/* private fields */);

Selector that prefers specific chains in priority order.

Patterns are tried in order; the first matching candidate is returned. If no patterns match, falls back to the first available candidate.

Example

use x402_types::scheme::client::PreferChain;
use x402_types::chain::ChainIdPattern;

// Prefer Base, then any EVM chain, then anything else
let selector = PreferChain::new(vec![
    "eip155:8453".parse().unwrap(),  // Base mainnet
    "eip155:*".parse().unwrap(),     // Any EVM chain
]);

Implementations

impl PreferChain

pub fn new<P: Into<Vec<ChainIdPattern>>>(patterns: P) -> Self

Creates a new chain preference selector.

pub fn or_chain<P: Into<Vec<ChainIdPattern>>>(self, patterns: P) -> PreferChain

Adds additional chain patterns with lower priority.

Trait Implementations

impl PaymentSelector for PreferChain

fn select<'a>( &self, candidates: &'a [PaymentCandidate], ) -> Option<&'a PaymentCandidate>

Selects a payment candidate from the available options.