# Services from api.foursec.xyz on Zero > api.foursec.xyz serves 25 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero. Canonical page: https://www.zero.xyz/host/api.foursec.xyz Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.foursec.xyz/health.json ## Services - [4SEC Cumulative Volume Delta (CVD) Crypto Market Data API](https://www.zero.xyz/c/4sec-cumulative-volume-delta-cvd-crypto-market-data-api-981d0d59/llms.txt): $0.02/call via x402. Returns real-time cumulative volume delta (CVD) and buy/sell volume data for a given crypto token symbol aggregated across multiple DEXes - [4SEC Futures Open Interest by Symbol](https://www.zero.xyz/c/4sec-futures-open-interest-by-symbol-f2384788/llms.txt): $0.03/call via x402. Returns aggregated futures open interest for a given crypto symbol, broken down by exchange, with a total in USD. - [4SEC Crypto Price Lookup by Symbol](https://www.zero.xyz/c/4sec-crypto-price-lookup-by-symbol-ddedd197/llms.txt): $0.01/call via x402. Returns real-time aggregated price, 24h change, and volume for a cryptocurrency symbol sourced from multiple DEXes - [4SEC Crypto Volatility Index API](https://www.zero.xyz/c/4sec-crypto-volatility-index-api-e35db1b7/llms.txt): $0.03/call via x402. Returns a real-time volatility index score and risk metrics for a given crypto token symbol, aggregated across multiple DEXes. - [4SEC Crypto Funding Rate API](https://www.zero.xyz/c/4sec-crypto-funding-rate-api-d7b313f6/llms.txt): $0.02/call via x402. Returns real-time perpetual futures funding rate data for a given crypto symbol, aggregated across multiple DEXes - [4SEC Crypto Volume by Symbol](https://www.zero.xyz/c/4sec-crypto-volume-by-symbol-409dd5b6/llms.txt): $0.02/call via x402. Returns real-time 24-hour trading volume for a given crypto token, aggregated across multiple DEXs, priced at $0.02 USDC per call via x402. - [4SEC Predicted Funding Rate API](https://www.zero.xyz/c/4sec-predicted-funding-rate-api-5ad5f47d/llms.txt): $0.02/call via x402. Returns the current funding rate and AI-predicted next funding rate for a given crypto perpetual futures symbol, along with trend direction. - [4SEC Futures Funding Rate Comparison API](https://www.zero.xyz/c/4sec-futures-funding-rate-comparison-api-d7645312/llms.txt): $0.03/call via x402. Returns and compares perpetual futures funding rates for a given crypto symbol across multiple exchanges or DEXs, highlighting arbitrage opportunities. - [4SEC Recent Liquidations API](https://www.zero.xyz/c/4sec-recent-liquidations-api-cffcc0db/llms.txt): $0.03/call via x402. Returns recent crypto liquidation events aggregated across multiple exchanges, including total USD value, count, and long-vs-short breakdown - [4SEC CVD History — Crypto Cumulative Volume Delta History](https://www.zero.xyz/c/4sec-cvd-history-crypto-cumulative-volume-delta-history-a8730775/llms.txt): $0.02/call via x402. Returns historical cumulative volume delta (CVD) data for a crypto trading pair, aggregated across multiple DEXes, bucketed over time. - [4SEC Liquidation Alert Subscription](https://www.zero.xyz/c/4sec-liquidation-alert-subscription-98adc75d/llms.txt): $0.06/call via x402. Registers a webhook-based liquidation alert for a crypto trading symbol, triggering a notification when a configurable USD threshold is crossed on DEX markets. - [4SEC Crypto Market Data API — Real-Time Prices](https://www.zero.xyz/c/4sec-crypto-market-data-api-real-time-prices-b93cdd4d/llms.txt): $0.005/call via x402. Fetches real-time aggregated cryptocurrency price data from multiple DEXes in a single request, paid per-call via USDC on Base. - [4SEC Crypto Price History API](https://www.zero.xyz/c/4sec-crypto-price-history-api-fa0f19aa/llms.txt): $0.02/call via x402. Returns historical OHLC candlestick price data for a given crypto token symbol, aggregated across multiple DEXs - [4SEC Futures Long/Short Ratio API](https://www.zero.xyz/c/4sec-futures-long-short-ratio-api-bfc7d91a/llms.txt): $0.02/call via x402. Returns real-time long/short ratio signals and top trader positioning data for a given crypto futures symbol, aggregated across multiple DEXes. - [4SEC Liquidation Heatmap API](https://www.zero.xyz/c/4sec-liquidation-heatmap-api-06af4ce8/llms.txt): $0.05/call via x402. Returns real-time liquidation cluster data and cascade risk assessment for a given crypto trading symbol across multiple DEXes. - [4SEC Crypto Market History API](https://www.zero.xyz/c/4sec-crypto-market-history-api-986525b9/llms.txt): $0.01/call via x402. Returns historical price and market data for a specific crypto asset across multiple DEXes, identified by asset ID and number of days - [4SEC Crypto Market Data API — Token Lookup by ID](https://www.zero.xyz/c/4sec-crypto-market-data-api-token-lookup-by-id-758a8304/llms.txt): $0.005/call via x402. Fetches real-time aggregated crypto market data for a specific token by ID, sourced from multiple DEXes, paid per-request with USDC on Base via x402. - [4SEC Crypto Price Alert Extend](https://www.zero.xyz/c/4sec-crypto-price-alert-extend-c72aeb9b/llms.txt): $0.01/call via x402. Extends the expiration time of an existing crypto price alert by adding up to 168 hours to its active duration. - [4SEC Futures Basis API](https://www.zero.xyz/c/4sec-futures-basis-api-f8a2c15f/llms.txt): $0.02/call via x402. Returns the futures basis (spot vs perpetual price spread) for a given crypto symbol across multiple exchanges, including the best carry trade opportunity. - [4SEC Crypto Spread API](https://www.zero.xyz/c/4sec-crypto-spread-api-619736e2/llms.txt): $0.02/call via x402. Returns real-time bid, ask, mid-price, and spread percentage for a given crypto trading pair aggregated across multiple DEXes - [4SEC Price Alert Setup](https://www.zero.xyz/c/4sec-price-alert-setup-7d7e894e/llms.txt): $0.04/call via x402. Creates a conditional price alert for a crypto token that fires a webhook when a specified price condition is met - [4SEC Funding Rate History API](https://www.zero.xyz/c/4sec-funding-rate-history-api-b82ff940/llms.txt): $0.03/call via x402. Returns historical funding rate data for a given crypto symbol across multiple DEXes - [4SEC Extreme Funding Rate Scanner](https://www.zero.xyz/c/4sec-extreme-funding-rate-scanner-305bcfb7/llms.txt): $0.02/call via x402. Returns a list of crypto assets with extreme funding rates across multiple DEXs, along with the threshold and total count of extreme cases - [4SEC Arbitrage Opportunity Finder](https://www.zero.xyz/c/4sec-arbitrage-opportunity-finder-7e7b014b/llms.txt): $0.05/call via x402. Returns real-time cross-DEX arbitrage opportunities aggregated from multiple decentralized exchanges - [4SEC Liquidation Alert Extend](https://www.zero.xyz/c/4sec-liquidation-alert-extend-0566758a/llms.txt): $0.01/call via x402. Extends the expiration time of an existing crypto liquidation alert by adding up to 168 hours Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. - [Zero catalog index](https://www.zero.xyz/llms.txt)