The full upstream README, mirrored here for reference. Install config, tool schemas, adoption signals, and an original overview live on the Kronos Crypto Data listing page.
Real-time crypto market data for AI agents — derivatives (funding / OI / basis), liquidations, options IV, GEX, CEX premium, multi-source price, realized volatility, market-regime detection, and TradFi macro across 16 assets. An optional ML price forecast is available as a premium add-on.
x402-native: no API key, no signup. An autonomous agent discovers this server and pays per call in USDC on Base via the x402 micropayment protocol. There is no dashboard, no account, no API-key provisioning — just point a funded wallet at it and call. That is the one thing incumbent crypto-data MCPs (CoinGecko / CoinMarketCap / CoinGlass) cannot do.
get_sample tool works with no wallet at all.The server boots and responds to initialize + tools/list without any environment variables set. Free tools (like get_sample) work without a wallet. Paid tools return a clear error if BUYER_PRIVATE_KEY is missing or the wallet has insufficient USDC — they never crash the server.
Add the server to your MCP client config. For paid tools, set BUYER_PRIVATE_KEY to a wallet funded with USDC on Base. Omit the env block entirely to run only the free get_sample tool.
That's it — no signup, no API key. The first paid call triggers an on-chain USDC micropayment and returns both the data and the settlement tx hash.
| Tool | Description | Cost |
|---|---|---|
get_derivatives | Full derivatives snapshot: funding rate, annualized funding, OI, 1h OI change, basis, funding trend, plain-English read | $0.02 |
get_funding_rate | Perpetual funding rate + annualized rate. Positive = bullish lean, negative = bearish lean | $0.02 |
get_open_interest | Open interest and 1-hour OI change. Rising OI + rising price = strong trend | $0.02 |
get_market_regime | Market regime: squeeze / breakout / funding-extreme / OI-surge / normal | $0.02 |
get_price | Real-time spot price for an asset | $0.001 |
get_snapshot | Everything-in-one snapshot: funding, OI, basis, regime, and forecast | $0.04 |
get_market_overview | Funding rate + OI snapshot across all 16 assets at once | $0.02 |
get_funding_extremes | Screener: assets with the most extreme funding rates right now | $0.003 |
get_fear_greed | Current crypto Fear & Greed index score and classification | $0.001 |
get_ohlc | OHLCV candlestick data. Optional: interval (1h,4h,1d) and limit | $0.001 |
get_volatility | Realized volatility metrics for an asset | $0.01 |
get_alerts | Regime alerts for an asset: squeeze, breakout, funding-extreme, OI-surge, or normal | $0.02 |
get_market_scan | Market-wide screen across up to 16 assets ranked by signal strength and regime state. Optional assets filter | $0.04 |
get_macro | TradFi macro snapshot: VIX, DXY, 10Y yield, SPX, gold — plus BTC correlations | $0.001 |
get_digest | Structured market narrative: machine-readable digest of funding, OI, regime, and forecast signals | $0.02 |
get_liquidations | Liquidation cluster-map and recent OKX liquidation prints. Identifies high-density price levels | $0.003 |
get_options_iv | Options implied volatility, skew, and term-structure. BTC and ETH only | $0.03 |
get_gex | Gamma exposure (GEX) and max-pain price. BTC and ETH only | $0.04 |
get_cex_premium | Coinbase premium: spot price difference between Coinbase and global aggregated price | $0.02 |
A predictive signal layered on top of the data — not financial advice.
| Tool | Description | Cost |
|---|---|---|
get_forecast | Kronos price forecast at 1h, 4h, or 24h horizon. Full ML model for btc/eth/sol; beta composite model for doge/xrp/bnb | $0.01 (btc/eth/sol) · $0.001 beta (doge/xrp/bnb) |
get_forecast_ledger | Machine-readable resolved-forecast accuracy history. Optional: asset, horizon, limit | $0.001 |
| Tool | Description | Cost |
|---|---|---|
get_sample | Sample data — explore the response format without paying or funding a wallet | Free |
All asset-scoped tools (except get_options_iv and get_gex) accept asset from: btc, eth, sol, bnb, xrp, doge, ada, avax, link, dot, ltc, trx, bch, atom, near, apt.
get_options_iv and get_gex accept btc or eth only. Forecasts are available only for btc/eth/sol (full ML) and doge/xrp/bnb (beta composite).
Use the config in Quick start above.
BUYER_PRIVATE_KEY is optional at boot — the server starts without it. Omit the env block entirely to use only the free get_sample tool, or add the key when you need paid data.
Then in your MCP client config:
When a paid tool is called, the server makes an HTTP GET to the Kronos API. The API returns HTTP 402 with the price and pay-to address. The server's x402 library builds an EIP-3009 transferWithAuthorization signed by the configured wallet and sends it in the retry request header. The x402 facilitator submits the on-chain transaction (paying gas). The settlement tx hash is returned alongside the data.
What to configure:
BUYER_PRIVATE_KEY — hex private key for a wallet funded with USDC on Base mainnet (eip155:8453). No ETH needed; x402 uses gasless EIP-3009 transfers.0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913Use a dedicated wallet. Fund it with only as much USDC as you need.
| Situation | Error returned |
|---|---|
| Paid tool called, no key set | Payment required — BUYER_PRIVATE_KEY is not set... |
| Paid tool called, wallet has no USDC | Payment failed — the configured wallet has insufficient USDC on Base mainnet... Fund the wallet at 0x... with USDC on Base... |
| Variable | Required | Default | Description |
|---|---|---|---|
BUYER_PRIVATE_KEY | No (free tools work without it) | — | Hex private key for wallet funded with USDC on Base mainnet |
BASE_URL | No | https://kronossignals.com | Kronos API base URL |
NETWORK | No | eip155:8453 | EIP-155 chain ID (8453 = Base mainnet) |
Never commit your private key to version control. The .gitignore excludes .env and .env.*. Use a dedicated wallet with a limited USDC balance. For production deployments, supply the key via a secrets manager.
The forecast tools provide a premium predictive signal, not financial advice. No accuracy or performance is guaranteed; get_forecast_ledger exposes the raw resolved-forecast history so you can judge it yourself.