/**
 * Node-only x402-wrapped fetch. Reads the allowance file, checks on-chain
 * USDC balances through independent RPC providers, and returns a fetch wrapper
 * that auto-signs 402 responses only when the requested chain has confirmed
 * funds.
 *
 * Balance reads are pre-payment, read-only operations. They may be retried and
 * failed over safely; a payment payload has not been created or submitted yet.
 * An exhausted RPC check is never represented as a zero balance.
 *
 * The viem / @x402/* / mppx imports live behind `./_paid-stack.ts` so the
 * SDK's direct surface to those packages is auditable from one file and the
 * packages can be declared as optional peer dependencies in package.json.
 *
 * Never calls `process.exit` — the SDK leaves exit-code decisions to the
 * CLI edge.
 */
import type { CredentialsProvider } from "../credentials.js";
import { Run402Error } from "../errors.js";
import type { MppStack, X402Stack } from "./_paid-stack.js";
import { PaymentBuyerError, type PayExecutor } from "../namespaces/pay.js";
import { type PaymentAttemptStore } from "./payment-attempts.js";
type FetchFn = typeof globalThis.fetch;
interface RpcClient {
    readContract: (args: unknown) => Promise<bigint>;
}
interface BalanceRetryOptions {
    attemptsPerProvider?: number;
    baseDelayMs?: number;
    sleep?: (milliseconds: number) => Promise<void>;
    random?: () => number;
}
interface PaymentRequirementLike {
    network?: string;
    amount?: string;
    [key: string]: unknown;
}
export interface X402PaymentRequirements {
    scheme: string;
    network: string;
    asset: string;
    amount: string;
    payTo: string;
    maxTimeoutSeconds: number;
    extra: Record<string, unknown>;
}
export interface X402PaymentRequired {
    x402Version: number;
    error?: string;
    resource: {
        url: string;
        description?: string;
        mimeType?: string;
    };
    accepts: X402PaymentRequirements[];
    extensions?: Record<string, unknown>;
}
export interface X402PaymentPayload {
    x402Version: number;
    resource?: X402PaymentRequired["resource"];
    accepted: X402PaymentRequirements;
    payload: Record<string, unknown>;
    extensions?: Record<string, unknown>;
}
export interface X402BuyerClient {
    createPaymentPayload(required: X402PaymentRequired): Promise<X402PaymentPayload>;
}
interface KnownBalance {
    status: "known";
    balance: bigint;
}
interface UnknownBalance {
    status: "unknown";
    error: X402BalanceError;
}
type BalanceState = KnownBalance | UnknownBalance;
type BalanceStates = Record<string, BalanceState>;
export type X402BalanceErrorCode = "X402_RPC_TIMEOUT" | "X402_RPC_RATE_LIMITED" | "X402_RPC_UNAVAILABLE" | "X402_INSUFFICIENT_FUNDS";
/**
 * A machine-readable x402 balance-preflight failure.
 *
 * `safeToRetry` is true only for read-only RPC failures. A confirmed balance
 * miss is not retryable without changing wallet funds or payment requirements.
 * Both states are emitted before payment payload creation, so
 * `mutationState` is always `not_started`.
 */
/**
 * The largest amount a first-party (api.run402.com) challenge may ask for:
 * the team tier. Every gateway price is at or under it, so a challenge above
 * it is not a price, it is a compromised or misconfigured host — refuse to
 * sign rather than trust a number the server chose. Arbitrary-URL purchases
 * through `pay.fetch` are bounded separately by the caller's `maxUsdMicros`.
 */
export declare const FIRST_PARTY_MAX_PAYMENT_USD_MICROS = 20000000;
/**
 * Refuse a first-party challenge whose every accepted requirement exceeds the
 * first-party cap. Requirements at or under the cap are left alone; the
 * selector picks among them as usual.
 */
export declare function assertFirstPartyPaymentWithinCap(required: unknown, firstPartyOrigin: string | null): void;
/** A first-party challenge above the largest known price. Never retried blindly. */
export declare class PaymentBuyerCapError extends Run402Error {
    readonly kind: "local_error";
    readonly code: "X402_AMOUNT_EXCEEDS_FIRST_PARTY_CAP";
    constructor(requestedUsdMicros: number);
}
export declare class X402BalanceError extends Run402Error {
    readonly kind: "local_error";
    readonly code: X402BalanceErrorCode;
    readonly cause?: unknown;
    constructor(code: X402BalanceErrorCode, message: string, details: Record<string, unknown>, cause?: unknown, nextActions?: import("../errors.js").NextAction[]);
}
export type X402PaymentNetwork = "eip155:8453" | "eip155:84532";
/** Public-chain operations exposed to an opaque signer provider. */
export interface PaymentPublicClient {
    readContract(args: unknown): Promise<bigint>;
}
/**
 * Minimum EVM signer shape needed by x402. Implementations may keep key
 * material behind KMS/HSM boundaries; only the public payer address and
 * signing operation cross into the SDK.
 */
export interface EvmPaymentSigner {
    readonly address: `0x${string}`;
    signTypedData(message: {
        domain: Record<string, unknown>;
        types: Record<string, unknown>;
        primaryType: string;
        message: Record<string, unknown>;
    }): Promise<`0x${string}`>;
    readContract?(args: unknown): Promise<unknown>;
    signTransaction?(args: unknown): Promise<`0x${string}`>;
    getTransactionCount?(args: {
        address: `0x${string}`;
    }): Promise<number>;
    estimateFeesPerGas?(): Promise<{
        maxFeePerGas: bigint;
        maxPriorityFeePerGas: bigint;
    }>;
}
/** Async, opaque x402 payer. Returning null means that network is unsupported. */
export interface EvmPaymentSignerProvider {
    getSigner(context: {
        network: X402PaymentNetwork;
        publicClient: PaymentPublicClient;
    }): Promise<EvmPaymentSigner | null>;
}
export type PaymentPayerSource = "payment_signer" | "allowance_path" | "credentials" | "default_allowance";
/** Safe, key-free provenance for the payer selected by paid fetch. */
export interface PaymentPayerProvenance {
    readonly source: PaymentPayerSource;
    readonly rail: "x402" | "mpp" | "lightning";
    readonly payers: readonly {
        readonly address: string;
        readonly network?: X402PaymentNetwork;
    }[];
}
export type ConfiguredPaidFetch = FetchFn & {
    readonly payer: PaymentPayerProvenance;
    readonly pay?: PayExecutor;
    /** Refreshes mutable balance state without re-resolving the selected payer. */
    refreshBalances(): Promise<void>;
};
export type LazyPaidFetch = FetchFn & {
    /** Initializes the selected source if needed and returns public payer provenance only. */
    getPayer(): Promise<PaymentPayerProvenance | null>;
    /** Execute the receipt-bearing arbitrary-URL buyer flow. */
    pay: PayExecutor;
};
export interface PaidFetchOptions {
    /** Explicit local allowance file. When set, no other allowance is consulted. */
    allowancePath?: string;
    /** Auth provider whose optional allowance capability may also fund payments. */
    credentials?: Pick<CredentialsProvider, "readAllowance">;
    /** Explicit opaque x402 signer. Mutually exclusive with allowancePath. */
    paymentSigner?: EvmPaymentSignerProvider;
    /**
     * The run402 API origin this fetch is wired to (defaults to
     * `getApiBase()`). Used ONLY to recognize a same-origin gateway response
     * carrying one of its own terminal, never-settled refusal codes (live-proof
     * defect B — see {@link isTerminalRoomInviteRefusal}) — never to route or
     * validate requests. A response from any other origin is unaffected.
     */
    apiBase?: string;
    /**  Build the buyer for this rail regardless of the persisted one (the Lightning buyer's x402 fallback). */
    railOverride?: "x402";
}
/** @internal Test seam; not re-exported from `@run402/sdk/node`. */
export declare function _setPaidStackLoadersForTest(loaders?: {
    x402?: () => Promise<X402Stack>;
    mpp?: () => Promise<MppStack>;
}): void;
interface TrackedPaidFetchOptions {
    store?: PaymentAttemptStore;
    createAttemptId?: () => string;
    now?: () => string;
    fetch?: FetchFn;
    classifyPaymentResponse?: (response: Response) => Promise<"completed" | "failed" | "already_settled" | "intent_pending" | "ambiguous">;
}
/** @internal Exported only for deterministic source-level tests; not re-exported by the package. */
export declare function checkBalanceAcrossProviders(clients: readonly RpcClient[], tokenAddress: string, walletAddress: string, network: string, options?: BalanceRetryOptions): Promise<bigint>;
/** @internal Exported only for deterministic source-level tests; not re-exported by the package. */
export declare function filterAffordableRequirements(requirements: PaymentRequirementLike[], balances: BalanceStates, 
/**
 * Payer address per network. Surfaced in the insufficient-funds error so the
 * `fund_wallet` next_action names WHERE to send money — "fund the wallet" is
 * not executable without an address. Optional: omitting it only omits the
 * `payers` detail.
 */
payers?: Readonly<Record<string, string>>): PaymentRequirementLike[];
export declare function setupPaidFetch(options?: PaidFetchOptions): Promise<ConfiguredPaidFetch | null>;
declare function createLazyPaidFetchFrom(setup: () => Promise<FetchFn | null>): FetchFn;
/**
 * Returns a fetch that lazily initializes the x402 wrapper on first call.
 * Failed initialization is not cached; concurrent first calls share one
 * attempt, and a later request can recover after transient RPC/setup failure.
 */
export declare function createLazyPaidFetch(options?: PaidFetchOptions): LazyPaidFetch;
/** @internal Source-level unit-test seam; not re-exported by the package. */
export declare const __paidFetchInternals: {
    createLazyPaidFetchFrom: typeof createLazyPaidFetchFrom;
};
interface X402BuyerFetchOptions extends TrackedPaidFetchOptions {
    supportedNetworks: readonly string[];
    payerAddresses?: readonly string[];
    offerReceipt?: X402OfferReceiptRuntime;
    verifyAtSeconds?: () => number;
}
interface X402OfferReceiptRuntime {
    extractOffersFromPaymentRequired: (required: unknown) => unknown[];
    decodeSignedOffers: (offers: unknown[]) => unknown[];
    findAcceptsObjectFromSignedOffer: (offer: unknown, accepts: unknown[]) => unknown | undefined;
    isEIP712SignedOffer: (offer: unknown) => boolean;
    isEIP712SignedReceipt: (receipt: unknown) => boolean;
    verifyOfferSignatureEIP712: (offer: unknown) => Promise<{
        signer: `0x${string}`;
        payload: Record<string, unknown>;
    }>;
    verifyReceiptSignatureEIP712: (receipt: unknown) => Promise<{
        signer: `0x${string}`;
        payload: Record<string, unknown>;
    }>;
    extractReceiptFromResponse: (response: Response) => unknown | undefined;
}
/**
 * Receipt-bearing buyer orchestration over an already-configured x402 client.
 * Signed proofs live only in this SDK instance's memory. An ambiguous retry of
 * the identical request re-presents that proof; it never mints a replacement.
 */
export declare function createX402BuyerFetch(client: X402BuyerClient, options: X402BuyerFetchOptions): PayExecutor;
export declare function paymentNetworkUnsupportedError(challengeNetworkValues: string[], walletNetworkValues: string[], extra?: Record<string, unknown>): PaymentBuyerError;
/**
 * Request-scoped payment tracker around `@x402/fetch`.
 *
 * The wrapped package may call its base fetch twice: first without payment to
 * obtain the 402 challenge, then with a signed payment authorization. The
 * AsyncLocalStorage context lets the base-fetch boundary update the correct
 * durable attempt even when multiple paid requests run concurrently.
 *
 * Exported from this module for deterministic boundary tests, but intentionally
 * not re-exported from the package entry point.
 */
export declare function createTrackedX402Fetch(wrapFetchWithPayment: (fetch: FetchFn, client: unknown) => FetchFn, client: unknown, opts?: TrackedPaidFetchOptions): FetchFn;
export {};
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