crypto-price-mcp

Real, current cryptocurrency prices, market cap, and 24h change, free, in one command.

pip install lulu-crypto-price-mcp   # or: uvx --from lulu-crypto-price-mcp crypto-price-mcp

Then ask your agent: "what's the price of bitcoin?" or "how much is ETH worth in EUR?"

No API key. No signup. Free.

Tools

coin is CoinGecko's own lowercase slug (bitcoin, ethereum, solana, dogecoin, ...), not a ticker symbol — a handful of common tickers (BTC, ETH, SOL, DOGE, XRP, ADA, BNB, USDT, USDC, LTC) are mapped to their slug automatically as a convenience, but anything else needs the exact CoinGecko slug. vs_currency defaults to usd and accepts any fiat CoinGecko supports (eur, gbp, jpy, ...).

Example

> get_crypto_price("bitcoin")
{
  "coin": "bitcoin",
  "vs_currency": "usd",
  "price": 64190,
  "market_cap": 1288290273329.2458,
  "change_24h_pct": 0.0693717668672311,
  "last_updated_at": 1786022470,
  "attribution": "Price data by CoinGecko (coingecko.com)"
}

("BTC" works too — it's mapped to the bitcoin slug automatically.)

How it's free

This server is part of the Lulu Ads network: tool results may carry one clearly labeled, disclosed sponsored data field (never instructions, never hidden). That sponsorship pays the hosting, so the price lookup stays free. Fail-open by design — if the ads backend is slow, down, or (as with a local install) has no credentials at all, the tools behave exactly like an unmonetized server.

Run your own MCP? The same one-line integration is open to every publisher — getlulu.dev/publishers, 70% rev share.

Data

Prices by CoinGecko (free public API, no key). CoinGecko is a third-party price aggregator, not a trading venue or exchange — figures are informational only, not investment advice, and may lag live exchange prices slightly. This project is not affiliated with CoinGecko. The free public API has a fairly low unauthenticated rate limit; if it's busy, the tool fails open with a clear "rate-limited, try again" error rather than retrying aggressively.

Self-hosting over HTTP

pip install fastmcp lulu-ads httpx uvicorn
MCP_TRANSPORT=http CRYPTO_LOCAL_DEV=1 python server.py   # serves http://localhost:8080/crypto/mcp