Build a sneaker price Discord bot

Before you start

• Node.js 18 or later, for the built-in fetch.
• A Discord application with a bot user. You need its application ID and bot token from the Discord developer portal. Invite the bot to your server with the bot and applications.commands scopes.
• A Barcodes.gg API token with the prices ability. Tokens on Standard and higher plans can carry it.

Install the library:

npm install discord.js

Register the /price command

Run this script once. It tells Discord that the bot has a /price command with one required option:

// register.mjs
import { REST, Routes, SlashCommandBuilder } from "discord.js";

const price = new SlashCommandBuilder()
  .setName("price")
  .setDescription("Resale prices for a sneaker style code")
  .addStringOption((option) =>
    option.setName("style_code").setDescription("For example DZ5485-612").setRequired(true));

const rest = new REST().setToken(process.env.DISCORD_TOKEN);
await rest.put(Routes.applicationCommands(process.env.DISCORD_APP_ID), { body: [price.toJSON()] });
console.log("Registered /price");

Answer the command

The bot sends one request per command and writes one line per marketplace row:

// bot.mjs
import { Client, GatewayIntentBits } from "discord.js";

const client = new Client({ intents: [GatewayIntentBits.Guilds] });

client.on("interactionCreate", async (interaction) => {
  if (!interaction.isChatInputCommand() || interaction.commandName !== "price") return;
  const styleCode = interaction.options.getString("style_code", true).trim();
  await interaction.deferReply();

  const res = await fetch(`https://barcodes.gg/api/v2/prices/${encodeURIComponent(styleCode)}`, {
    headers: { Authorization: `Bearer ${process.env.BARCODES_TOKEN}` },
  });
  const body = await res.json();
  if (!res.ok || body.error) {
    await interaction.editReply(`No resale prices found for ${styleCode}.`);
    return;
  }

  const lines = body.results.sites.flatMap((site) => {
    const asks = site.sizes.map((size) => size.price).filter((price) => price !== null);
    if (asks.length === 0) return [];
    const market = site.market ? ` ${site.market}` : "";
    return [`${site.site}${market}: from ${Math.min(...asks)} ${site.currency} (${asks.length} sizes)`];
  });
  const note = body.results.is_stale ? "\nThe newest price is older than 24 hours." : "";
  await interaction.editReply(`**${styleCode}**\n${lines.slice(0, 15).join("\n")}${note}`);
});

client.login(process.env.DISCORD_TOKEN);

Run it

export DISCORD_TOKEN=your-bot-token
export DISCORD_APP_ID=your-application-id
export BARCODES_TOKEN=your-barcodes-token
node register.mjs
node bot.mjs

In Discord, type /price DZ5485-612. The bot shows one line for each marketplace row with a price, for example StockX in the Spanish market and Alias in USD.

Calls, limits and next steps

• Each command uses one call. A style code without cached prices is not charged.
• Keep the Barcodes.gg token on the server that runs the bot. Do not put it in a public repository.
• To save calls on a busy server, keep each answer in memory for a few minutes and reuse it.
• To show one size, read size.eu or size.us from the same answer and filter the rows.
• To answer from a barcode, call /api/v2/prices/barcode/{barcode}. The answer then holds the size of that barcode only.

All fields are described on the sneaker resale price API page and in the documentation.