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Arrays supports two authentication modes. Send your key in the X-API-Key header. 
curl "https://data-tools.prd.arrays.org/api/v1/stocks/company/detail?symbol=AAPL" \
  -H "X-API-Key: $ARRAYS_API_KEY"

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Get a key

  1. Sign up at arrays.org (email, Google, or GitHub)
  2. Copy the key from your Dashboard — visible immediately
  3. Store in env / secret manager — never commit to git

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Security best practices

  • Never expose your API key in client-side code (browser, mobile, public Cursor rules).
  • Use a backend proxy if you need to call Arrays from a browser app.
  • Rotate keys regularly from the Dashboard.
  • Use separate keys for dev / staging / prod.

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2. Nanopayment (no key, pay-per-call)

For crypto endpoints, you can skip the API key entirely and pay per call in USDC. Full Nanopayment guide → 
import { wrapFetchWithPayment } from "x402-fetch";

const fetchWithPayment = wrapFetchWithPayment(fetch, walletClient);
const res = await fetchWithPayment(
  "https://data-tools.prd.arrays.org/api/v1/crypto/funding-rate?symbol=BTCUSDT"
);