/**
 * Exa research capabilities — neural web search, cited Q&A, and batch
 * URL content fetch via the BlockRun `/v1/exa/*` endpoints.
 *
 * Three tools:
 *  - ExaSearch     — semantic search for URLs ($0.01/call)
 *  - ExaAnswer     — synthesized answer with citations ($0.01/call)
 *  - ExaReadUrls   — batch-fetch clean Markdown from URLs ($0.002/URL)
 *
 * Why these matter for an economic agent: ExaAnswer is Perplexity-in-a-
 * tool — the agent gets a grounded reply with sources, avoiding the
 * usual hallucination problem without needing to chain search + fetch
 * + synthesize by hand. ExaReadUrls is roughly 5× cheaper than the
 * Playwright-backed `WebFetch` for batch reading, and returns clean
 * Markdown ready to drop into an LLM context window.
 *
 * All three share the same x402 payment flow (Base or Solana) — a
 * 402 triggers a signed USDC transfer, retry succeeds.
 */
import type { CapabilityHandler } from '../agent/types.js';
export declare const exaSearchCapability: CapabilityHandler;
export declare const exaAnswerCapability: CapabilityHandler;
export declare const exaReadUrlsCapability: CapabilityHandler;