import type { PickDeep } from 'type-fest';
import { type CCIPRequest, type OffchainTokenData, type WithLogger, NetworkType } from './types.ts';
/**
 * Returns the USDC attestation for a given tokenAmount.extraData and txHash
 * https://developers.circle.com/cctp/quickstarts/transfer-usdc-ethereum-to-arc#3-3-retrieve-attestation
 *
 * @param opts - CCTPv2 options
 * @param networkType - network type (mainnet or testnet)
 * @returns USDC/CCTP attestation and message
 */
export declare function getUsdcAttestation(opts: {
    /** CCTP sourceDomain */
    sourceDomain: number;
    /** CCTP burn eventNonce */
    nonce: number;
    /** burn txHash, same as CCIP request */
    txHash: string;
}, networkType: NetworkType): Promise<{
    attestation: string;
    message: string;
}>;
/**
 * CCTP V2 finality tier identifiers returned by Circle's burn-fees API.
 *
 * These are **opaque tier IDs**, not block counts or durations.
 * The CCTP V2 whitepaper (Section 8, Table 2) defines exactly two tiers today;
 * additional tiers may be added in the future (the wide spacing between values
 * is intentional to leave room).
 *
 * @see https://developers.circle.com/cctp/concepts/fees
 * @see CCTP V2 Whitepaper, Section 8 — "Finality Levels"
 */
/** Fast / pre-finality tier: attested seconds after soft confirmation. */
export declare const CCTP_FINALITY_FAST = 1000;
/** Standard / finalized tier: attested after full on-chain finality. */
export declare const CCTP_FINALITY_STANDARD = 2000;
/**
 * Fetches USDC burn fee tiers from Circle's CCTP API.
 *
 * @param sourceDomain - CCTP source domain identifier
 * @param destDomain - CCTP destination domain identifier
 * @param networkType - network type (mainnet or testnet)
 * @returns Array of fee tiers with finality thresholds and BPS fees
 * @throws {@link CCIPUsdcBurnFeesError} if the HTTP request fails or the response is not a valid array of fee tiers
 */
export declare function getUsdcBurnFees(sourceDomain: number, destDomain: number, networkType: NetworkType): Promise<{
    finalityThreshold: number;
    minimumFee: number;
}[]>;
/**
 * Returns the LBTC attestation for a given payload hash
 *
 * @param payloadHash - hash of the payload of the LBTC transfer
 * @param networkType - network type (mainnet or testnet)
 * @returns LBTC attestation bytes
 */
export declare function getLbtcAttestation(payloadHash: string, networkType: NetworkType): Promise<{
    attestation: string;
}>;
/**
 * Fetch CCIPv1 offchain token data for USDC and LBTC tokenAmounts
 * @param request - CCIPRequest containing tx.hash and message
 * @returns Promise resolving to an OffchainTokenData for each tokenAmount
 */
export declare function getOffchainTokenData(request: PickDeep<CCIPRequest, 'tx.hash' | `message`>, { logger }?: WithLogger): Promise<OffchainTokenData[]>;
//# sourceMappingURL=offchain.d.ts.map