/**
 * Multi-ledger x402 receipt normalization helpers.
 *
 * x402 paid MCP servers are starting to advertise non-Base payment rails. Buyer
 * agents need one normalized receipt envelope before signing, with explicit
 * ledger, asset, settlement target, verification state, and custody boundary.
 */
export type X402LedgerNamespace = 'eip155' | 'xrpl' | 'tvm' | 'solana' | 'other';
export type X402VerificationStatus = 'verified' | 'pending' | 'unsupported_refused' | 'failed' | 'unknown';
export type X402CustodyBoundary = 'non-custodial' | 'facilitator' | 'managed' | 'unknown';
export type X402MultiLedgerReceipt = {
    schema: 'agentpay-x402-multi-ledger-receipt/v1';
    observedAt: string;
    source: {
        name: string;
        repo?: string;
        evidenceUrl?: string;
        pushedAt?: string;
    };
    payment: {
        x402Version: string;
        paymentHeader: 'Payment-Signature';
        receiptHeader: 'payment-response';
    };
    ledger: {
        label: string;
        namespace: X402LedgerNamespace;
        chainId?: string | number;
    };
    settlement: {
        asset: string;
        target: string;
        reference?: string;
    };
    verification: {
        status: X402VerificationStatus;
        verifier?: string;
        checkedAt: string;
    };
    boundary: {
        custody: X402CustodyBoundary;
        nonCustodial: boolean;
        description: string;
    };
    unsupportedLedgerRefusal?: string;
};
export type X402MultiLedgerReceiptPolicy = {
    supportedLedgerNamespaces: X402LedgerNamespace[];
    allowedAssets: string[];
    allowedSettlementTargets: string[];
    requireNonCustodialBoundary: boolean;
    requireVerifiedReceipt: boolean;
    allowUnsupportedRefusalProof: boolean;
};
export type X402MultiLedgerReceiptDecision = {
    ok: boolean;
    decision: 'allow' | 'deny';
    failures: string[];
    warnings: string[];
};
export declare function evaluateX402MultiLedgerReceipt(receipt: X402MultiLedgerReceipt, policy: X402MultiLedgerReceiptPolicy, now?: Date): X402MultiLedgerReceiptDecision;
export declare function buildAgentPayBaseReceiptExample(): X402MultiLedgerReceipt;
export declare function buildXrplUnsupportedRefusalExample(): X402MultiLedgerReceipt;
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