export type BillingMode = "per-token" | "subscription" | "free";
export interface ModelPricing {
    inputPerMillion: number;
    outputPerMillion: number;
    updatedAt: string;
}
/**
 * Get the billing mode for a provider.
 */
export declare function getBillingMode(provider: string): BillingMode;
/**
 * Look up pricing for a provider + model, resolving aliases.
 */
export declare function getProviderPricing(provider: string, model: string): ModelPricing | null;
/**
 * Calculate actual cost from token counts.
 * Returns null when tokens are unavailable, 0 for free providers.
 */
export declare function calculateCost(provider: string, model: string, inputTokens: number | null, outputTokens: number | null): number | null;
/**
 * Estimate cost for a planned run (before execution).
 * Uses the same calculation as calculateCost but clearly named for pre-run usage.
 */
export declare function estimateCost(provider: string, model: string, estInputTokens: number, estOutputTokens: number): number | null;