/**
 * Fee asset metadata.
 *
 * Protocol fees are quoted in base units of an asset that is not always the
 * native coin: a `data_access` fee on mainnet is denominated in USDC.e,
 * which has 6 decimals, so formatting every amount as 18-decimal VANA is
 * wrong by twelve orders of magnitude and mislabels the currency. Worse,
 * comparing a `--max-fee` parsed as ether against a 6-decimal amount
 * silently disables the guard.
 */
/** Zero address in a fee quote means the chain's native coin. */
export declare const NATIVE_ASSET = "0x0000000000000000000000000000000000000000";
export interface AssetInfo {
    address: string;
    symbol: string;
    decimals: number;
}
/**
 * Resolve an asset's symbol and decimals, reading the ERC20 on chain once
 * per process. Unknown assets fall back to raw base units rather than
 * guessing 18 decimals, so a wrong number is never shown as if it were
 * right.
 */
export declare function resolveAsset(asset: string | undefined, rpcUrl: string): Promise<AssetInfo | null>;
/** Human amount for display: "0.01 USDC.e", or base units when unknown. */
export declare function formatAssetAmount(amount: string, info: AssetInfo | null): string;
/**
 * Parse a user-supplied decimal limit into base units of the asset.
 * Returns null when the asset is unknown, so callers refuse to compare
 * rather than compare wrongly.
 */
export declare function parseAssetAmount(value: string, info: AssetInfo | null): bigint | null;
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