# Services from api.syntalic.com on Zero > api.syntalic.com serves 18 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.syntalic.com Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.syntalic.com/health.json ## Services - [Best Price — Cross-Retailer Lowest Price Finder](https://www.zero.xyz/c/best-price-cross-retailer-lowest-price-finder-60e1e512/llms.txt): $0.01/call via x402. Finds the lowest current price for a product across Amazon, Walmart, Costco, Home Depot, Nordstrom, and IKEA in the US or Canada, returning the cheapest option plus comparison prices from other retailers. - [Brand Tracker](https://www.zero.xyz/c/brand-tracker-d042c2d2/llms.txt): $0.01/call via x402. Tracks a brand's average, min, and max price, product count, in-stock count, and promo count day-by-day across a specified date range. - [Deal Finder](https://www.zero.xyz/c/deal-finder-e24c72a3/llms.txt): $0.01/call via x402. Discovers actively-promoted discounted products in a given category above a minimum discount threshold, ranked by discount depth with price, list price, and retailer. - [Price Dispersion](https://www.zero.xyz/c/price-dispersion-3a6c4966/llms.txt): $0.02/call via x402. Analyzes price spread within a product category, computing mean, standard deviation, coefficient of variation, and percentiles (p10–p90) with IQR-based outlier exclusion. - [Syntalic Price History](https://www.zero.xyz/c/syntalic-price-history-b21a7264/llms.txt): $0.01/call via x402. Returns historical price observations for a product over a date range, including current price, period low/high/avg, price trend, good-deal flag, and a time-series for charting. - [Syntalic Promo Intelligence](https://www.zero.xyz/c/syntalic-promo-intelligence-d3750f39/llms.txt): $0.01/call via x402. Analyzes promotional activity within a product category — promo frequency, average discount depth, and max discount — aggregated by brand or retailer over a date range. - [Retailer Index](https://www.zero.xyz/c/retailer-index-0e16ff00/llms.txt): $0.02/call via x402. Computes a normalized price index (retailer average / category average) for a specific retailer day-by-day versus its category baseline over a date range. - [Category Summary](https://www.zero.xyz/c/category-summary-d78bb9f2/llms.txt): $0.02/call via x402. Returns high-level statistics for a product category including product/brand/retailer counts, pricing aggregates (avg/min/max/median), average rating, promo rate, in-stock rate, and top brands. - [Syntalic Competitive Landscape](https://www.zero.xyz/c/syntalic-competitive-landscape-55a804f8/llms.txt): $0.01/call via x402. Returns all products and their current prices across retailers within a category, sortable by price, rating, or review count for competitive benchmarking. - [Syntalic Inflation Tracker](https://www.zero.xyz/c/syntalic-inflation-tracker-7a7d93e7/llms.txt): $0.02/call via x402. Tracks category-level retail price inflation over a configurable date range with daily, weekly, or monthly granularity, returning period-over-period and overall price change. - [Price Positioning](https://www.zero.xyz/c/price-positioning-7f461c41/llms.txt): $0.01/call via x402. Compares a brand's average price to its category average/median and classifies the brand as premium, mid-range, or value positioned. - [Share Of Shelf](https://www.zero.xyz/c/share-of-shelf-1ebe1156/llms.txt): $0.01/call via x402. Measures each brand's share of a product category by product count, revealing digital shelf dominance across retailers. - [Syntalic Attention vs Shelf](https://www.zero.xyz/c/syntalic-attention-vs-shelf-b7acc2d2/llms.txt): $0.05/call via x402. Compares social media attention (TikTok/Instagram signals) against retail shelf presence for brands within a product category, ranked by engagement metrics. - [Syntalic Taxonomy Reference Lookup](https://www.zero.xyz/c/syntalic-taxonomy-reference-lookup-a07cf025/llms.txt): $0.01/call via x402. Resolves up to 100 taxonomy IDs into their reference metadata (names, hierarchy, classification details) for retail product categorization. - [Syntalic Brick Attributes Reference Lookup](https://www.zero.xyz/c/syntalic-brick-attributes-reference-lookup-d65a53d5/llms.txt): $0.01/call via x402. Looks up taxonomy reference data for GS1 Brick attribute IDs, returning structured metadata for up to 100 IDs per request. - [Syntalic Taxonomy Reference Lookup](https://www.zero.xyz/c/syntalic-taxonomy-reference-lookup-f7f4de21/llms.txt): $0.01/call via x402. Resolves up to 100 taxonomy IDs to their full reference metadata (names, hierarchy, category paths) in a single batch call. - [Syntalic Analyst Price Bands](https://www.zero.xyz/c/syntalic-analyst-price-bands-57a9115b/llms.txt): $0.02/call via x402. Returns analyst/market-level price band data for a product category, showing how prices cluster across the market - [Price Drop Alert](https://www.zero.xyz/c/price-drop-alert-9b82bbf4/llms.txt): $0.01/call via x402. Check whether a product's current price is below its rolling average, returning current price, rolling average, lowest-seen price, and date within a configurable lookback window. 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)