· 13 min read
Shopify Tarot Reading: Card of the Day With App Proxy
Shopify tarot reading via App Proxy: a card of the day, daily horoscope, kundli and post-checkout numerology, with the API key kept server side.
B
Brett Calloway
Developer Advocate & AI Integration Specialist
United States36 articles published
Brett Calloway has 12 years of experience building APIs and developer tooling, including three years focused on AI-native infrastructure for spiritual and wellness applications. He writes on building context-rich AI agents using Model Context Protocol, drawing on a developer relations background. His coverage spans API integration patterns, AI agent architecture, and rapid prototyping with astrology, tarot, and numerology data.
12 years in API developmentDeveloper relations backgroundWriting on AI agents and MCP
API integrationAI agentsModel Context ProtocolDeveloper toolsAstrology APIMCP
Articles by Brett Calloway
· 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.
· 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.
· 17 min read
How to Add Numerology Features to Your Dating App (Complete API Guide)
Add numerology-powered matchmaking to a dating app with three endpoints: chart, compatibility, and personal year. Working code, caching, multi-language, MCP shortcut.
· 13 min read
AI Astrology Bot: A Free Open Source Chatbot You Deploy
AI astrology bot from an open source repo: clone it, paste two API keys, deploy, and answer Vedic, tarot, numerology and dream questions.
· 10 min read
MCP Registry Guide 2026: Where and How to List Your Server
Where to list your MCP server in 2026. Publish to the official MCP Registry, prove your namespace, and propagate to downstream directories. By RoxyAPI.
· 12 min read
AGENTS.md for API Providers: Teach AI Coding Tools to Use Your API
How to ship an AGENTS.md in your API SDK so Copilot, Windsurf, Cline, and Claude Code call your endpoints correctly. By RoxyAPI.
· 10 min read
Biorhythm Meaning: Three Cycles and How They Are Computed
Biorhythm meaning in plain terms: physical, emotional and intellectual cycles that start at birth, how each is computed, and how an API returns them.
· 10 min read
How to Verify Astrology Software Against NASA JPL
Learn to verify astrology accuracy using NASA JPL Horizons as ground truth. Step-by-step guide with tolerance thresholds, common errors, and automated testing.
· 12 min read
How to Evaluate a Tarot API: Developer Checklist 2026
A 10-point checklist to evaluate tarot APIs on card coverage, spread support, reproducibility, AI readiness, and pricing before you commit.
· 9 min read
Astrology API Cost Compared: Flat Plans vs Credit Wallets
Astrology API cost compared: flat per-request plans vs credit wallets, with per-call math for RoxyAPI, Prokerala and AstrologyAPI in 2026.
· 12 min read
How to Evaluate an Astrology API Before You Build On It
An 11-point checklist for evaluating astrology APIs covering accuracy, benchmark lineage, pricing, SDK support, MCP tools, and production readiness.