/**
 * Thrown by {@link ControllerEVMWalletClient} before a transaction is
 * handed off to the controller for signing/broadcast (BYOK) or to the
 * remote signing service (server mode) when the sender's native balance
 * cannot cover `value + gas * feePerGas`.
 *
 * The upstream `TransactionController` swallows `eth_estimateGas`
 * failures (including insufficient-funds errors) and substitutes ~95% of
 * the block gas limit as a safe fallback so the MetaMask extension UI can
 * still show a "proceed anyway" warning. fox-sdk has no human gate, so we
 * surface the failure here as a typed error instead of silently
 * forwarding a doomed transaction.
 *
 * Carries the raw wei numbers so the CLI / agent can render a precise
 * message without re-fetching balance.
 */
export declare class InsufficientNativeFundsError extends Error {
    readonly account: string;
    readonly balance: bigint;
    readonly required: bigint;
    readonly value: bigint;
    readonly gas: bigint;
    readonly feePerGas: bigint;
    constructor(args: {
        account: string;
        balance: bigint;
        required: bigint;
        value: bigint;
        gas: bigint;
        feePerGas: bigint;
    });
}
/**
 * Thrown by {@link EVMWalletClient.sendToken} before the ERC-20 `transfer`
 * is signed or broadcast when the sender's on-chain token balance is below
 * the requested transfer amount.
 *
 * Sibling to {@link InsufficientNativeFundsError}: that one guards
 * `value + gas * feePerGas` against the native balance for every tx; this
 * one guards `amount` against the ERC-20 balance for token transfers
 * specifically, since the controller / RPC have no way to surface an
 * ERC-20 shortfall pre-broadcast (it would only manifest as an on-chain
 * revert after the tx is mined).
 *
 * The error carries raw `bigint`s plus the token address so the catcher
 * (CLI, agent tool, plugin) can format with whatever decimals / symbol it
 * already has cached — avoids paying a metadata round-trip on the hot path.
 */
export declare class InsufficientTokenBalanceError extends Error {
    readonly account: string;
    readonly token: string;
    readonly balance: bigint;
    readonly required: bigint;
    constructor(args: {
        account: string;
        token: string;
        balance: bigint;
        required: bigint;
    });
}