import type { EvmReadProvider } from "../types/evm.js";
/**
 * Fee override parameters compatible with viem transaction calls.
 * @remarks
 * - Legacy transactions use `gasPrice` and must be tagged with `{ type: "legacy" }` for viem.
 * - EIP-1559 transactions use `maxFeePerGas` and `maxPriorityFeePerGas`.
 */
export type FeeOverrides = {
    type: "legacy";
    gasPrice: bigint;
} | {
    maxFeePerGas: bigint;
    maxPriorityFeePerGas: bigint;
};
/**
 * Spread a `FeeOverrides` value into individual fields for `writeContract`.
 * @internal
 */
export declare function spreadFeeOverrides(overrides?: FeeOverrides): Record<string, unknown>;
export declare function buildFeeOverrides(provider: EvmReadProvider, options?: {
    legacyTx?: boolean;
}): Promise<FeeOverrides | undefined>;
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