9 min read
Ship AI Prompt Files for Cursor, Claude Code, Copilot
Compare CLAUDE.md, Cursor rules, Copilot instructions, and Windsurf rules. What goes in each prompt file for API consumers. By RoxyAPI.
Blog
Insights, tutorials, and updates from the RoxyAPI team
Recent Posts
9 min read
MCP vs Function Calling vs LangChain: AI Agent Guide
Comparing MCP, OpenAI function calling, and LangChain tools for AI agents. Schema, transport, auth, and when to choose each. By RoxyAPI.
13 min read
Add Tarot Readings to a Shopify Store with App Proxy
Add a tarot card of the day, daily horoscope, kundli, and post-checkout numerology to a Shopify store via App Proxy. One pattern for all 12 domains.
12 min read
Vikram Samvat to Gregorian: Hindu Calendar for Vedic Charts
Convert Vikram Samvat lunar months, tithi, and paksha into a Gregorian birth date for the Vedic chart API. Adhika masa, kshaya masa, regional variants.
12 min read
Birth-Time Rectification API: Handling 15 Minute Uncertainty
Sweep the natal endpoint across a plus or minus 15 minute window, separate stable features from collapsing ones, surface confidence by RoxyAPI.
11 min read
AGENTS.md vs llms.txt vs ai-plugin.json vs agent-card.json
Four agent-discovery files, four different consumers. Compare AGENTS.md, llms.txt, ai-plugin.json, and agent-card.json with byte sizes and shipping rules.
11 min read
Why two numerology APIs return different Life Path numbers
Three independent reasons numerology APIs disagree on the same input: Master Number stop rules, Unicode normalisation, and reduction order.
12 min read
Whole Sign Fallback at Polar Latitudes for Birth Chart APIs
Placidus and Koch fail above 66 degrees north. Here is what RoxyAPI returns at the cutoff and how to override to Whole Sign for traditional charts.
10 min read
Retrograde Station Detection: Stationary Point Edge Cases
Why naive day-step retrograde detection misses planetary stations, and how to detect zero crossings of longitude velocity for the astrology API.
10 min read
Why 6 Arcminutes Can Flip a Vedic Marriage Match
Nakshatra pada precision matters: a 6 arcminute Moon drift can flip the pada and swing Gun Milan by 5 to 10 points.
12 min read
DST and Historical Timezones Break Vedic Kundli Accuracy
Pre-1948 India, wartime DST, and Pakistan plus Bangladesh DST years quietly corrupt kundli charts. Use IANA strings to fix it, by RoxyAPI.
12 min read
Build a Voice Astrology Agent with Vapi and Remote MCP
Wire a Vapi voice assistant to a Remote MCP astrology server in under 30 minutes. Step-by-step setup, web SDK embed, cost breakdown by RoxyAPI.
Featured Posts
13 min read
Best Tarot APIs for Developers 2026: Features and Pricing
Compare the best tarot APIs for developers: 78-card decks, spreads, seeded draws, card images, MCP, and flat pricing reviewed by RoxyAPI.
12 min read
Best Vedic Astrology API for Kundli and Panchang 2026
Compare RoxyAPI, AstrologyAPI, and Prokerala for kundli, panchang, dasha, and KP: fact-checked features, pricing, and real cost math.