Token market check

---
name: dexscreener-token
description: Look up a token's live market data on DexScreener by chain and contract address - price in USD, price change over 5m/1h/6h/24h, 24h volume, buys and sells, liquidity, market cap, FDV and the most liquid trading pair. Use when the user asks for a token's price, chart stats or liquidity.
---

# Token market check

Read-only, free, no API key. Works for any chain DexScreener tracks.

## Run

```bash
node scripts/token.mjs <chain> <tokenAddress>
node scripts/token.mjs solana JUPyiwrYJFskUPiHa7hkeR8VUtAeFoSYbKedZNsDvCN
```

Chain ids are DexScreener's: `solana`, `base`, `ethereum`, `bsc`, `arbitrum`, ...

## Output

JSON on stdout: `{ chainId, address, symbol, name, priceUsd, change: { m5, h1, h6, h24 },
volume24hUsd, txns24h: { buys, sells }, liquidityUsd, marketCapUsd, fdvUsd, pairCount,
bestPair: { dexId, pairAddress, quoteSymbol, url, createdAt } }`.

If DexScreener has no pair for the token the script exits with code 1 and prints
`{ "error": "No trading pairs found ..." }`. Say that plainly to the user.

## Notes for the agent

- The numbers come from the single most liquid pair; `pairCount` says how many pairs exist.
- Low liquidity (under a few thousand USD) means quoted prices move a lot on small trades.

{
  "slug": "dexscreener-token",
  "name": "Token market check",
  "spine": "Price check",
  "summary": "Gives a token's price, 5m to 24h price change, volume, liquidity, market cap and its most liquid pair, from DexScreener.",
  "job": "Check a token's price and liquidity",
  "category": "market",
  "chains": ["solana", "base", "ethereum", "bsc", "any DexScreener chain"],
  "version": "1.0.0",
  "author": "Shelfwise",
  "license": "MIT",
  "price": { "type": "free" },
  "entry": "scripts/token.mjs",
  "runtime": "Node 18+ or Bun, no dependencies",
  "permissions": {
    "network": ["api.dexscreener.com"],
    "keys": [],
    "env": [],
    "wallet": "none",
    "filesystem": "none"
  },
  "sources": [
    { "name": "DexScreener API: tokens by address", "url": "https://docs.dexscreener.com/api/reference" }
  ],
  "ask": "Check the price and liquidity of JUPyiwrYJFskUPiHa7hkeR8VUtAeFoSYbKedZNsDvCN on Solana."
}

MIT License

Copyright (c) 2026 Shelfwise

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

// Token market check: price, change, volume and liquidity from DexScreener. Zero dependencies.
import { pathToFileURL } from "node:url";

const API = "https://api.dexscreener.com";
const num = (v) => (Number.isFinite(Number(v)) && v !== null && v !== undefined ? Number(v) : null);

export async function tokenMarket(chain, address) {
  if (!chain || !address) throw new Error("Usage: token.mjs <chain> <tokenAddress>");
  if (!/^[a-z0-9-]+$/i.test(chain) || !/^[A-Za-z0-9]+$/.test(address)) throw new Error("Invalid chain or address");
  const res = await fetch(`${API}/tokens/v1/${chain}/${address}`, { headers: { accept: "application/json" } });
  if (!res.ok) throw new Error(`DexScreener answered ${res.status}`);
  const pairs = (await res.json()) ?? [];
  const mine = (Array.isArray(pairs) ? pairs : []).filter(
    (p) => p?.baseToken?.address?.toLowerCase() === address.toLowerCase(),
  );
  const list = mine.length ? mine : Array.isArray(pairs) ? pairs : [];
  if (!list.length) throw new Error(`No trading pairs found for ${address} on ${chain}`);
  const best = list.reduce((a, b) => ((num(b.liquidity?.usd) ?? 0) > (num(a.liquidity?.usd) ?? 0) ? b : a));
  return {
    source: "dexscreener",
    fetchedAt: new Date().toISOString(),
    chainId: best.chainId,
    address: best.baseToken.address,
    symbol: best.baseToken.symbol,
    name: best.baseToken.name,
    priceUsd: num(best.priceUsd),
    change: {
      m5: num(best.priceChange?.m5),
      h1: num(best.priceChange?.h1),
      h6: num(best.priceChange?.h6),
      h24: num(best.priceChange?.h24),
    },
    volume24hUsd: num(best.volume?.h24),
    txns24h: { buys: num(best.txns?.h24?.buys), sells: num(best.txns?.h24?.sells) },
    liquidityUsd: num(best.liquidity?.usd),
    marketCapUsd: num(best.marketCap),
    fdvUsd: num(best.fdv),
    pairCount: list.length,
    bestPair: {
      dexId: best.dexId,
      pairAddress: best.pairAddress,
      quoteSymbol: best.quoteToken?.symbol ?? null,
      url: best.url,
      createdAt: best.pairCreatedAt ? new Date(best.pairCreatedAt).toISOString() : null,
    },
  };
}

if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
  tokenMarket(process.argv[2], process.argv[3])
    .then((r) => console.log(JSON.stringify(r, null, 2)))
    .catch((e) => {
      console.log(JSON.stringify({ error: String(e?.message ?? e) }));
      process.exit(1);
    });
}

// Self-test against a long-lived token (JUP on Solana). Run: node test.mjs
import { pathToFileURL } from "node:url";
import { tokenMarket } from "./scripts/token.mjs";

export default async function test() {
  const r = await tokenMarket("solana", "JUPyiwrYJFskUPiHa7hkeR8VUtAeFoSYbKedZNsDvCN");
  const checks = [];
  const check = (name, ok) => checks.push({ name, ok: Boolean(ok) });
  check("finds the token", r.symbol === "JUP");
  check("has a positive USD price", r.priceUsd > 0);
  check("has liquidity", r.liquidityUsd > 0);
  check("reports at least one pair", r.pairCount >= 1);
  check("links the best pair", typeof r.bestPair?.url === "string" && r.bestPair.url.startsWith("https://"));
  let rejected = false;
  try { await tokenMarket("solana", "not a mint!"); } catch { rejected = true; }
  check("rejects a malformed address", rejected);
  return { ok: checks.every((c) => c.ok), checks };
}

if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
  test().then((r) => { console.log(JSON.stringify(r, null, 2)); process.exit(r.ok ? 0 : 1); },
    (e) => { console.log(JSON.stringify({ ok: false, error: String(e?.message ?? e) })); process.exit(1); });
}