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When integrating the Nuwa Kit to your AI services, with either model endpoint or MCPs, you will be setting a fixed per-request price. The unit price is Pico USD, which is 1/1,000,000,000,000 USD (1e-12). Here’s a simple converter to help you convert between USD and PicoUSD:

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Converter Function

Here’s a code snippet to help you convert between USD and PicoUSD:
UsdToPico.ts
// Convert a USD amount to Pico USD (1 USD = 1e12 pico USD) with round-half-up at 12 decimals.
const USD_SCALE = 1_000_000_000_000n; // 1e12

export function usdToPico(usd: string | number): bigint {
  const s = typeof usd === "number" ? usd.toString() : usd;
  const clean = s.trim();
  if (!clean || !/^\d*(?:\.\d*)?$/.test(clean)) {
    throw new Error("Invalid USD amount");
  }
  const [intPart = "0", frac = ""] = clean.split(".");
  const frac12 = (frac + "000000000000").slice(0, 12); // pad/truncate to 12
  const nextDigit = frac.length > 12 ? Number(frac[12]) : 0; // 13th digit for rounding
  let scaled = BigInt(intPart || "0") * USD_SCALE + BigInt(frac12 || "0");
  if (nextDigit >= 5) scaled += 1n; // round-half-up
  return scaled;
}

// Examples
const p1 = usdToPico("0.0035"); // 3500000000n
const p2 = usdToPico(0.1);       // 100000000000n

// If your API expects a string or JSON value instead of BigInt:
const pricePicoUSD = usdToPico("0.0035").toString();