Display localized pricing in Next.js

When to use this skill

Use this skill when building a public pricing page (or in-app upgrade screen) that needs to show prices in the user's local currency, with the right tax behavior. Covers the Paddle.PricePreview() API, country detection, a billing frequency toggle (monthly/yearly), the zero-decimal currency formatting gotcha (JPY/KRW/CLP), and how to keep the displayed price in sync with what checkout will charge.

This is a client-side concern. For checkout itself, see checkout-web — the price IDs you display here are the same ones you pass to Paddle.Checkout.open().

Why use PricePreview at all?

You could hardcode "$10/month" in your UI, but comes with very strong regional pricing built-in — the same plan might be $10 in the US, €9 in the EU (with VAT), £8 in the UK, and ¥1,200 in Japan. Across countries that share a currency you can set different prices for each country to account for purchasing power parity. Hardcoding works only for one market.

PricePreview() returns the correct price for a given country, with currency, formatting, and applicable tax already calculated. The string it gives you is what the user will be charged — no client-side math.

If a Paddle MCP server is available to you, call client.pricingPreview.preview({ items: [{ price_id: "pri_...", quantity: 1 }], address: { country_code: "US" }, currency_code: "USD" }) inside an execute to get the same data server-side — useful for verifying what users will see in different countries before wiring up the client-side hook. Note pricingPreview is camelCase, but country_code and currency_code are snake_case.

The Paddle MCP exposes three tools per server (search, execute, report_missing_tool). Workflow: call search to confirm the exact method name and parameter shapes, then call execute with an async function that calls client.<resource>.<operation>(...). Method paths are camelCase (client.clientTokens.create, client.pricingPreview.preview). Body params and response fields are snake_case (tax_category, product_id, unit_price, currency_code). Pagination is { pagination: { hasMore }, data: [...] } with { after: "<last_id>" } — not .next() / .hasMore. Chain multi-step workflows inside one execute; variables don't persist between calls. Hard caps: 50 API calls per execute, 30s timeout, 32KB code.

Prerequisites

• Same Paddle.js setup as checkout-web:

npm install @paddle/paddle-js

NEXT_PUBLIC_PADDLE_CLIENT_TOKEN=test_...
NEXT_PUBLIC_PADDLE_ENV=sandbox

• One or more prices in your Paddle catalog, ideally with price overrides for the markets you sell to.
  • A single base price (no overrides) will be auto-converted, but explicit overrides give you control over rounding and psychological pricing (e.g. €9 not €9.13).
  • Use catalog-setup if you don't have prices yet — that skill includes a section on regional overrides.

Define your tiers

A typical setup keeps tier metadata (name, features) in a constants file, with the Paddle price IDs alongside:

// constants/pricing-tier.ts
export interface Tier {
  name: string;
  id: "starter" | "pro" | "advanced";
  description: string;
  features: string[];
  featured: boolean;
  priceId: { month: string; year: string };
}

export const PricingTier: Tier[] = [
  {
    name: "Starter",
    id: "starter",
    description: "Get going.",
    features: ["1 workspace", "Limited collaboration"],
    featured: false,
    priceId: {
      month: "pri_01h...",
      year: "pri_02h...",
    },
  },
  // ...
];

The PricePreview hook

A small custom hook keeps the pricing logic in one place. It takes the Paddle instance and a country code, returns a map of priceId → formatted total:

// hooks/usePaddlePrices.ts
import { type Paddle, type PricePreviewParams, type PricePreviewResponse } from "@paddle/paddle-js";
import { useEffect, useState } from "react";
import { PricingTier } from "@/constants/pricing-tier";

export type PaddlePrices = Record<string, string>;

function getLineItems(): PricePreviewParams["items"] {
  return PricingTier.flatMap((tier) =>
    [tier.priceId.month, tier.priceId.year].map((priceId) => ({
      priceId,
      quantity: 1,
    })),
  );
}

function getPriceAmounts(prices: PricePreviewResponse): PaddlePrices {
  return prices.data.details.lineItems.reduce<PaddlePrices>((acc, item) => {
    acc[item.price.id] = item.formattedTotals.total;
    return acc;
  }, {});
}

export function usePaddlePrices(
  paddle: Paddle | undefined,
  country: string,
): { prices: PaddlePrices; loading: boolean } {
  const [prices, setPrices] = useState<PaddlePrices>({});
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    if (!paddle) return;

    const params: Partial<PricePreviewParams> = {
      items: getLineItems(),
      // 'OTHERS' is a sentinel meaning "let Paddle infer from IP".
      ...(country !== "OTHERS" && { address: { countryCode: country } }),
    };

    setLoading(true);
    paddle.PricePreview(params as PricePreviewParams).then((response) => {
      setPrices((prev) => ({ ...prev, ...getPriceAmounts(response) }));
      setLoading(false);
    });
  }, [country, paddle]);

  return { prices, loading };
}

item.formattedTotals.total is a fully-formatted string like "$9.99" or "¥1,200" — including the currency symbol and locale-appropriate grouping. Use it directly; don't reformat.

If you want the raw amount (for math, comparisons, custom display), item.totals.total gives you the integer in lowest-currency-units (cents for USD, whole units for the zero-decimal currencies — see "The currency formatting gotcha" below).

The pricing page component

Compose the hook with Paddle.js initialization and a billing frequency toggle:

// components/pricing.tsx
"use client";

import { type Environments, initializePaddle, type Paddle } from "@paddle/paddle-js";
import { useEffect, useState } from "react";
import { usePaddlePrices } from "@/hooks/usePaddlePrices";
import { PricingTier } from "@/constants/pricing-tier";

interface Props {
  country: string;
}

export function Pricing({ country }: Props) {
  const [frequency, setFrequency] = useState<"month" | "year">("month");
  const [paddle, setPaddle] = useState<Paddle | undefined>();

  const { prices, loading } = usePaddlePrices(paddle, country);

  useEffect(() => {
    if (!process.env.NEXT_PUBLIC_PADDLE_CLIENT_TOKEN) return;
    initializePaddle({
      token: process.env.NEXT_PUBLIC_PADDLE_CLIENT_TOKEN,
      environment: process.env.NEXT_PUBLIC_PADDLE_ENV as Environments,
    }).then((p) => p && setPaddle(p));
  }, []);

  return (
    <div>
      <FrequencyToggle value={frequency} onChange={setFrequency} />
      <div className="grid grid-cols-3 gap-6">
        {PricingTier.map((tier) => {
          const priceId = tier.priceId[frequency];
          const formatted = prices[priceId];
          return (
            <div key={tier.id}>
              <h3>{tier.name}</h3>
              <p className="text-3xl">
                {loading || !formatted ? "..." : formatted}
                <span className="text-sm">/{frequency}</span>
              </p>
              {/* ... features, CTA button ... */}
            </div>
          );
        })}
      </div>
    </div>
  );
}

This pattern initializes Paddle.js without the checkout config — you only need the client token to call PricePreview(). When the user clicks "Subscribe" you re-initialize with checkout settings (or use a separate page that does), as covered in checkout-web.

Country detection

You have three options, in increasing order of accuracy and cost:

A. Default to a sensible market. US, US visitors, JS-disabled, geo-blocking — just default to OTHERS (Paddle infers from IP at checkout time anyway):

<Pricing country="OTHERS" />

B. Read from the request headers. In the App Router, headers() in a Server Component gives you headers including geo info from your CDN (e.g. Vercel sets x-vercel-ip-country):

// app/pricing/page.tsx
import { headers } from "next/headers";
import { Pricing } from "@/components/pricing";

export default async function PricingPage() {
  const h = await headers();
  const country = h.get("x-vercel-ip-country") ?? "OTHERS";
  return <Pricing country={country} />;
}

C. Let the user pick. A <select> with a list of supported countries, defaulting to the IP-detected one. Useful for showing prices to a global audience and letting them switch (e.g. a buyer in the US researching for a colleague in Germany). Not recommended as users may choose the country that gives them the lowest price.

Country selector

const COUNTRIES = [
  { code: "OTHERS", label: "Default (auto)" },
  { code: "US", label: "United States" },
  { code: "GB", label: "United Kingdom" },
  { code: "DE", label: "Germany" },
  { code: "JP", label: "Japan" },
  // ...
];

export function CountrySelect({
  value,
  onChange,
}: {
  value: string;
  onChange: (v: string) => void;
}) {
  return (
    <select value={value} onChange={(e) => onChange(e.target.value)}>
      {COUNTRIES.map((c) => (
        <option key={c.code} value={c.code}>
          {c.label}
        </option>
      ))}
    </select>
  );
}

The usePaddlePrices hook re-fetches when the country changes — no extra wiring needed.

Currency unit formatting

Currencies are stored in their lowest unit — 1099 means $10.99, 850 means £8.50, 2500 means €25.00.

Three currencies don't use decimals: JPY, KRW, and CLP. 1200 means ¥1,200 / ₩1,200 / CLP$1,200 (not ¥12.00 etc.), since they don't have minor units. CLP technically has historical centavos but Paddle treats it as zero-decimal for everyday transactions.

This matters when you take the raw item.totals.total integer and convert to a number for your own UI:

// utils/parse-money.ts
export function convertAmountFromLowestUnit(amount: string, currency: string): number {
  switch (currency) {
    case "JPY":
    case "KRW":
    case "CLP":
      return parseFloat(amount);
    default:
      return parseFloat(amount) / 100;
  }
}

export function formatMoney(amount: number, currency: string): string {
  const language = typeof navigator !== "undefined" ? navigator.language : "en-US";
  return new Intl.NumberFormat(language, {
    style: "currency",
    currency,
  }).format(amount);
}

export function parseMoney(amount = "0", currency = "USD"): string {
  return formatMoney(convertAmountFromLowestUnit(amount, currency), currency);
}

If you're using formattedTotals.total from the API, you don't need this — Paddle does it for you. You only need the parsing helper when you're computing your own amounts (e.g. showing "save 20%" between monthly and yearly).

Consider using Intl.NumberFormat to format the amount directly, rather than using the parsing helper. See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat

Combining with checkout

When the user clicks "Subscribe" on a tier, pass the same priceId that was used in PricePreview — they'll see the exact same price in checkout:

function handleSubscribe(tier: Tier, frequency: "month" | "year") {
  paddle?.Checkout.open({
    items: [{ priceId: tier.priceId[frequency], quantity: 1 }],
  });
}

Paddle re-uses the country detection at checkout, so a user who saw EUR pricing in the preview will see EUR in checkout, with VAT applied if they're in the EU.

Common pitfalls

• Reformatting formattedTotals.total. It's already a locale-formatted string. Wrapping it in Intl.NumberFormat produces nonsense ("$$9.99") or throws.
• Forgetting the zero-decimal currency exception. Dividing JPY/KRW/CLP by 100 turns the raw value into a 100x-too-small number. Always branch on currency.
• Doing your own math on raw amounts. This is not recommended. Paddle automatically handles calculations for you, including global tax compliance.
• Setting address.countryCode to 'OTHERS' in the API call. 'OTHERS' is a sentinel your code uses to mean "don't pass an address" — Paddle doesn't recognize it. Drop the address field instead (as in the hook above).
• Showing prices before Paddle.js initializes. prices[priceId] will be undefined for ~200ms on page load. Handle the loading state explicitly ('...' placeholder, skeleton).
• Calling PricePreview on every render. The hook above re-fetches on country change. If you also re-fetch on frequency change, you're doubling work — both prices come back in a single call when you include both priceId.month and priceId.year in items.
• Mixing sandbox and production price IDs. A pri_01h... from sandbox doesn't exist in production. Paddle.js will throw a "price not found" error.
• Not creating price overrides. Without overrides, Paddle auto-converts. This is a better buyer experience than presenting a price in USD to all users, but we recommend setting explicit overrides for your top markets (US, EU, UK, JP, etc.).

Verify the integration

1. Open your pricing page with no country prop — confirm prices appear within ~500ms.
2. Open dev tools → Network → filter for paddle.com. You should see one PricePreview request, returning a JSON payload with formattedTotals for each price.
3. Switch the country selector to JP, KR, or CL — confirm the prices update to the corresponding zero-decimal currency (JPY/KRW/CLP) with no decimal places.
4. Switch to DE — confirm the price includes VAT (compare to US which does not).
5. Click "Subscribe" on a tier — confirm the checkout opens with the same currency and amount.
6. With NEXT_PUBLIC_PADDLE_ENV=production (against a production token), confirm production price IDs resolve and sandbox IDs throw.

Related docs

• Paddle.PricePreview reference
• Offer localized pricing
• Create products and prices
• Currencies
• Reference implementation: paddle-nextjs-starter-kit — see src/hooks/usePaddlePrices.ts, src/utils/paddle/parse-money.ts, src/components/home/pricing/pricing.tsx.