export interface UsageTokens {
    /** Provider-reported input tokens, including cached input tokens when present. */
    inputTokens: number;
    /** Provider-reported output/completion tokens. */
    outputTokens: number;
    /** Input tokens billed at the cached-input rate. Defaults to 0. */
    cachedInputTokens?: number;
}
export interface UsagePricing {
    inputUsdPerMtok: number;
    outputUsdPerMtok: number;
    cachedInputUsdPerMtok?: number;
}
export interface PriceUsageOptions {
    /** Known tokenometer model id. Used to resolve registry pricing. */
    modelId?: string;
    /** Explicit per-million-token pricing. Required when modelId is omitted. */
    pricing?: UsagePricing;
    usage: UsageTokens;
}
export interface PriceUsageResult {
    model?: string;
    inputTokens: number;
    cachedInputTokens: number;
    billableInputTokens: number;
    outputTokens: number;
    inputUsd: number;
    cachedInputUsd: number;
    outputUsd: number;
    totalUsd: number;
}
export declare const priceUsage: (options: PriceUsageOptions) => PriceUsageResult;
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