/**
 * Client-side mirror of the Pythia service error taxonomy. The service taxonomy
 * is flat (each error extends `Error` directly across `dial/errors.ts` and
 * `reads/errors.ts`); the SDK adds a shared {@link PythiaClientError} root so a
 * consumer can `instanceof`-catch every Pythia-originated condition with one
 * check while still discriminating the specific subclasses. Each class sets
 * `name` to its own name for wire-stable identification, mirroring the service
 * convention.
 */
/** One attempted host's transport failure, as carried by the 502 body. */
export interface SourceFailure {
    sourceId: string;
    url: string;
    cause: unknown;
}
/** Shared root of every Pythia client error. Consumers catch this to handle any
 * Pythia-originated failure; the subclasses discriminate the specific cause. */
export declare class PythiaClientError extends Error {
    constructor(message: string);
}
/** A missing or empty required input the service rejected (a 400 whose message
 * names the field, e.g. `"tx is required..."`). */
export declare class PythiaValidationError extends PythiaClientError {
    constructor(message: string);
}
/** A chain the service does not serve (a 400 whose message starts
 * `"Unsupported chain:"`). Not reachable through normal client use since the
 * client always sets `chain=stoachain`, but mapped for a changed service. */
export declare class PythiaUnsupportedChainError extends PythiaClientError {
    constructor(message: string);
}
/** The whole node pool was exhausted (a 502 `{error:"PythiaPoolExhaustedError",
 * chainId?, failures}`). Carries each per-source failure and the optional chain
 * scope so a consumer can inspect what went down. */
export declare class PythiaPoolExhaustedError extends PythiaClientError {
    readonly failures: SourceFailure[];
    readonly chainId?: number;
    constructor(args: {
        failures: SourceFailure[];
        chainId?: number;
    });
}