--- name: data.crestsystems.ai description: data.crestsystems.ai provides snapshot market data for cryptocurrency assets and DeFi chains, covering current prices, gas fees, trending assets, and on-chain TVL metrics. All endpoints return point-in-time data with no streaming or historical time-series support. The host serves agents that need current-state inputs for decision-making, cost estimation, or market awareness. host: data.crestsystems.ai --- # data.crestsystems.ai Crest Systems operates a paid market data API focused on current-state cryptocurrency and DeFi metrics. It serves agents that need a lightweight, multi-asset price snapshot, gas cost estimates for Base network transactions, trending asset discovery, or per-chain DeFi TVL breakdowns. It is distinct from full-featured data platforms in that it offers a small, focused set of snapshot endpoints rather than broad historical or streaming coverage. ## When to use this host Use this host when an agent needs current-snapshot cryptocurrency prices across multiple assets, gas fee tiers for Base network transactions, a ranked trending asset list, or DeFi TVL data for a specific chain. Do not use it for historical price queries, OHLCV time-series, real-time streaming feeds, or token swap execution — those require a dedicated historical data provider (e.g., CoinGecko Pro, Messari) or a DEX aggregator. Ethereum gas values from fetch-gas-prices may be null and should not be relied upon; use a dedicated Ethereum gas oracle if Ethereum gas accuracy is critical. The DeFi chain endpoint requires a chain name input and returns aggregate TVL, not live token prices or trade routes. ## Capabilities ### Crypto Market Snapshots Provides current price, market cap, volume, and 24h change for a broad list of cryptocurrency assets, plus a ranked list of currently trending assets with BTC-denominated prices. - **`fetch-crest-price-feed`** — Returns current price, market cap, 24h volume, 24h change, and 24h high/low for a list of cryptocurrencies from Crest Systems' market data endpoint. - **`fetch-trending-crypto-assets`** — Returns a ranked list of trending cryptocurrency assets with market cap rank and BTC price, sourced from Crest Systems. ### On-Chain Network Data Supplies current gas price tiers for the Base network and per-chain DeFi TVL metrics including ranked protocol breakdowns and 24h TVL change. - **`fetch-gas-prices`** — Returns current gas prices (fast, standard, slow) in gwei for the Base network and Ethereum via a paid endpoint. - **`fetch-defi-chain-data`** — Returns TVL and top protocol metrics for a specified blockchain chain, including per-protocol TVL, 1-day change, category, and chain count. ## Workflows ### Transaction Cost Pre-Check with Market Context *Use when an agent needs to estimate the cost of a Base network transaction in USD terms before submitting it, requiring both current gas prices and a reference token price.* 1. **`fetch-gas-prices`** — Retrieve current fast/standard/slow gas prices in gwei for the Base network to determine transaction cost in ETH. 2. **`fetch-crest-price-feed`** — Retrieve current ETH price in USD so the gwei-denominated gas cost can be converted to a USD estimate. ### DeFi Chain Opportunity Scan *Use when an agent needs to assess a specific blockchain's DeFi ecosystem alongside which crypto assets are currently attracting market attention.* 1. **`fetch-defi-chain-data`** — Retrieve total TVL and top protocol breakdown for the target chain to assess DeFi activity and capital concentration. 2. **`fetch-trending-crypto-assets`** — Cross-reference trending assets against the chain's top protocols to identify whether trending tokens align with high-TVL DeFi activity. ## Skill reference ### `fetch-crest-price-feed` **Crest Price Feed** — Returns current price, market cap, 24h volume, 24h change, and 24h high/low for a list of cryptocurrencies from Crest Systems' market data endpoint. *Use when:* Use when an agent needs current cryptocurrency market data including price, market cap, 24h trading volume, 24h percent change, and 24h high/low for multiple assets in a single request. *Not for:* Do not use for historical price data or time-series queries; this endpoint returns only current snapshot data. Not suitable for a single specific asset lookup if the full list response is too large to process. **Returns:** Returns a JSON object with a 'prices' array; each element contains id, symbol, name, price (USD), market_cap, volume_24h, change_24h (percent), high_24h, and low_24h for each listed cryptocurrency. **Example:** `GET https://data.crestsystems.ai/data/prices` --- ### `fetch-gas-prices` **Gas Data API** — Returns current gas prices (fast, standard, slow) in gwei for the Base network and Ethereum via a paid endpoint. *Use when:* Use when an agent needs current on-chain gas price estimates (fast, standard, slow in gwei) for the Base network before submitting or estimating transaction costs. *Not for:* Do not use for real-time streaming gas feeds or historical gas data; this is a single-shot snapshot. Ethereum gas values may be null and should not be relied upon. **Returns:** Returns a gas object with fast/standard/slow gwei prices for Base (and nullable Ethereum), plus paid=true and price="$0.01". **Example:** `GET https://data.crestsystems.ai/data/gas` --- ### `fetch-trending-crypto-assets` **Trending Data Feed** — Returns a ranked list of trending cryptocurrency assets with market cap rank and BTC price, sourced from Crest Systems. *Use when:* Use when an agent needs to identify which crypto assets are currently trending, ranked by score, including their market cap rank and BTC-denominated price. *Not for:* Do not use for historical trending data or real-time price streaming; this is a single-shot snapshot of current trending assets. **Returns:** Returns a trending array of 15 crypto assets each with id, symbol, name, market_cap_rank, price_btc, and score, plus a count integer, paid boolean, and price string. **Example:** `GET https://data.crestsystems.ai/data/trending` --- ### `fetch-defi-chain-data` **Crest DeFi Chain Data** — Returns TVL and top protocol metrics for a specified blockchain chain, including per-protocol TVL, 1-day change, category, and chain count. *Use when:* Use when an agent needs on-chain DeFi statistics for a specific blockchain, such as total TVL, a ranked list of protocols by TVL, their categories, and 24-hour TVL change percentages. *Not for:* Do not use for real-time price feeds or token swap quotes; this endpoint returns aggregate DeFi TVL data, not live market prices or executable trade routes. **Inputs:** - `chain` (string, required) — Blockchain chain identifier to query DeFi data for, supplied as a path parameter. **Returns:** Returns a defi object with chain name, chainId, total TVL in USD, and an array of top protocols each with name, TVL, 1-day TVL change percentage, category, and number of chains supported. **Example:** `GET https://data.crestsystems.ai/data/defi/Base` ---