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Market data is the first thing a crypto agent needs and the first thing that breaks: free endpoints rate-limit, paid ones each want their own key, and historical series are scattered across vendors. Through AgentKey your agent gets quotes, rankings, candles, indices and on-chain indicators the same way it gets everything else — find_tools, describe_tool, execute_tool — with CoinMarketCap, Surf and Chainbase behind the scenes, so a price question can be answered from a market aggregator or straight from the chain.

What you can ask

  • “What is ETH trading at right now, and how much did it move in the last 24 hours?”
  • “List the top 20 tokens by market cap with their 24h change.”
  • “Which meme coins gained the most today?”
  • “Give me daily BTC candles for the last 90 days.”
  • “What is the Fear & Greed index today, and what was it a month ago?”
  • “How much flowed into US spot Bitcoin ETFs this week?”
  • “比特币的 MVRV 现在是多少?过去一年的走势如何?”
  • “What does the 4h MACD look like for BTC/USDT right now?”

What’s covered

Quotes and listings
  • Latest quote — price, volume, market cap — for one or more cryptocurrencies by id, slug or symbol
  • Ranked, paginated listing of every active cryptocurrency with current market data, or the ranking as it stood on a past date
  • Token leaderboard sorted by market cap, 24h change or volume, with FDV, supply, ATH/ATL and 24h range; filter by category such as meme, AI, L1, L2, DeFi or gaming
  • Current price and price history of a token by contract address, read from the chain
Price history and candles
  • Historical quotes (price, volume, market cap) over an interval
  • K-line candles — open, high, low, close, volume and trader count — and lighter K-line price points
  • Price history over preset ranges from one day to all-time, or a custom from/to window
  • Technical indicators for a trading pair on a given exchange and interval, as the latest value or a time series, with indicator-specific tuning
Indices and market-wide metrics
  • CoinMarketCap 20 and CoinMarketCap 100 indices — latest value, constituents and weights, plus history
  • Global cryptocurrency market metrics, latest and historical
  • Fear & Greed index — latest value and history, with a classification label and the BTC price at each point
On-chain indicators and ETF flows
  • On-chain indicator series for BTC and ETH: NUPL, SOPR, MVRV, Puell Multiple, NVM, NVT, NVT golden cross and exchange flows (inflow, outflow, netflow, reserve)
  • Daily US spot ETF flow history for BTC and ETH — net flow in USD, token price and a per-ticker breakdown

How to use it

Pass the request in plain language and let the router pick the tool:
Both English and Chinese phrasing work. Always describe_tool before executing — the identifier a tool expects (CoinMarketCap id, symbol, slug or contract address), the interval options and the per-call cost differ between providers.
Building with code? The same capability is available as fixed-contract Scenario Methods with automatic provider failover: crypto.market.list for a ranked token list and crypto.token.price for one token’s current price and 24h figures.

FAQ

Yes. Historical quotes, K-line candles, listings as of a past date, index history, Fear & Greed history, on-chain indicator series and daily ETF flows all accept a time range or interval. Candle granularity depends on the provider — describe_tool shows the options.
Every call is fetched at request time from the provider; nothing is served from a stale archive. Quotes reflect what the aggregator or the chain returns at that moment.
On-chain indicators (NUPL, SOPR, MVRV and the rest) and spot ETF flow history are available for BTC and ETH. Quotes, listings, candles and price history cover any listed cryptocurrency.