按量付费的市场调研 API：先给问题定价

const API = 'https://www.crawlforge.dev/api/v1/tools/'
const headers = {
  'X-API-Key': process.env.CRAWLFORGE_API_KEY ?? '',
  'Content-Type': 'application/json',
}

// One study, one budget in credits. Each call states its published price, and
// the guard refuses any call that could take the study past its budget.
export function study(budget: number) {
  let spent = 0
  return async function call(tool: string, body: object, price: number) {
    if (spent + price > budget) throw new Error(`Budget reached: ${spent} of ${budget} credits`)
    const res = await fetch(API + tool, { method: 'POST', headers, body: JSON.stringify(body) })
    if (res.status === 402) throw new Error('Balance empty. Nothing was charged.')
    if (!res.ok) return null
    const json = await res.json()
    spent += json.credits_used
    return json
  }
}

const call = study(150)
const question = 'Is this product priced per seat, per usage, or at a flat rate?'

// Search results include listicles; keep only vendors' own pricing pages in practice.
const found = await call('search_web', { query: 'help desk software pricing', limit: 30 }, 5)
for (const result of found?.data.results ?? []) {
  const page = await call('scrape', { url: result.url, formats: [{ type: 'question', question }] }, 3)
  console.log(result.url, page?.data.formats.answer?.text ?? '(no answer)')
}