Struct ChainFee 

#[repr(C)]
pub struct ChainFee {
    pub chain_id: u8,
    pub _pad: [u8; 7],
    pub base_fee_native: u64,
    pub priority_fee_native: u64,
    pub estimated_gas_units: u64,
    pub native_price_1e9: u64,
    pub last_update_ns: u64,
}

Per-chain gas fee snapshot. Interpretation depends on chain_id:

• EVM (chain_id 0-4): base_fee_native=gwei, priority_fee_native=gwei, estimated_gas_units=gas (150k-300k depending on protocol)
• Solana (chain_id 5): base_fee_native=lamports (5000), priority_fee_native=micro-lamports/CU, estimated_gas_units=compute units (~200k)

Fields

chain_id: u8

Chain identifier (0=eth, 1=arb, 2=base, 3=op, 4=polygon, 5=solana).

_pad: [u8; 7]

base_fee_native: u64

Base fee in chain-native units.

priority_fee_native: u64

Priority/tip fee in chain-native units.

estimated_gas_units: u64

Estimated gas/compute units for a standard swap.

native_price_1e9: u64

Native token price in USD, 1e9-scaled (ETH/MATIC/SOL).

last_update_ns: u64

Timestamp of last observation (nanoseconds since epoch).

Implementations

impl ChainFee

pub fn total_gas_cost_native(&self) -> u64

Total gas cost in the smallest native unit (gwei for EVM, lamports for Solana).

• EVM: (base_gwei + priority_gwei) * gas_units → total gwei
• Solana: base_lamports + (priority_micro_lamports * CU / 1_000_000) → total lamports

pub fn gas_cost_usd_1e9(&self) -> u64

Estimated gas cost in USD (1e9 scaled).

Both EVM and Solana share the same final step once total_gas_cost_native() returns the correct smallest-unit value: cost_usd_1e9 = total_native * native_price_1e9 / 1e9 which equals cost_usd = total_native * price / 1e18 (the /1e9 handles smallest-unit→whole-coin, the price is already 1e9-scaled).

Trait Implementations

impl Clone for ChainFee

fn clone(&self) -> ChainFee

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChainFee

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ChainFee

fn default() -> Self

Returns the “default value” for a type.

impl Copy for ChainFee