Best Astrology APIs for Developers in 2026: Complete Comparison Guide

Choosing an astrology API is a structural decision. Pick the wrong one and you stitch three providers, pay triple, and still miss tarot or numerology. Pick the right one and you ship a multi-domain spiritual app in days.

The market has matured. Four providers cover most production use cases in 2026. The rest are either single-tradition niche tools, frozen-stack legacy products, or solo-operator side projects with stack-licensing risk. This guide compares the serious four on domain coverage, MCP transport, accuracy, pricing, and developer experience. Every claim is verifiable, every number is dated May 2026.

What separates a serious astrology API from the rest

A production-grade astrology API in 2026 satisfies six criteria. Skip any of them and you ship a fragile stack that breaks under real usage.

• Domain coverage: How many spiritual data domains does one key cover? Single-domain providers force you to integrate three or four vendors for a multi-feature app.
• Verified accuracy: Planetary position calculations require ephemeris validation against a reference like NASA JPL Horizons. Look for a public benchmark you can run, not vendor marketing claims.
• MCP transport: For AI agents, the question is not whether the provider ships MCP. It is whether the MCP is remote Streamable HTTP (works on any platform) or local stdio (only works on a developer laptop running an IDE assistant).
• First-party SDKs: Hand-rolled HTTP clients are fine for prototypes. Production needs typed SDKs with AGENTS.md so Cursor and Claude Code do not hallucinate endpoints.
• Pricing predictability: Flat per-request beats credit wallets. A Vedic kundli call can burn 10x the credits of a daily horoscope on wallet pricing, so monthly costs are unprojectable.
• Documentation surface: Interactive playground (Scalar, Mintlify, RapiDoc) beats Postman-only. AI-discoverable surfaces (llms.txt, agent-card.json) decide whether AI search engines cite you.

Ready to ship? RoxyAPI covers 12 domains under one key. See pricing.

How do the leading providers compare

The four providers below were selected on production readiness, not exhaustive coverage. Smaller providers exist (free-tier solo operators, frozen-stack legacy tools) but none meet all six criteria from the previous section. Every cell below was verified from the provider source in May 2026.

The honest read: AstrologyAPI.com leads on raw endpoint count and SDK breadth (8 languages versus our 3). RoxyAPI leads on domain bundling, accuracy verifiability, MCP namespace coverage, and pricing transparency. Prokerala and VedicAstroAPI are Vedic specialists with regional language depth, weaker on AI-native integration.

Why MCP transport matters more than MCP existence

MCP is the emerging standard for connecting AI agents to external tools. By 2026 most providers ship something MCP-shaped. The real question is the transport: remote Streamable HTTP versus local stdio. The difference decides whether your AI agent works on production platforms or only on a developer laptop.

Remote Streamable HTTP is a hosted endpoint the provider runs. Any AI agent on any platform points at the URL and is calling tools within seconds. No installation, no local process. This is what plugs into hosted automation platforms like n8n, Dify, Make, Zapier, Lovable, Bubble, Wix, and Bolt; messaging-bot stacks like Telegram, WhatsApp, and Slack; CMS and framework targets like WordPress and Next.js; and IDE assistants like Claude Code, Cursor, VS Code, and Windsurf. See the MCP setup guide for the full transport documentation.

Local stdio is a wrapper the developer downloads, installs dependencies for, runs as a local process, and babysits through restart loops. Hosted automation platforms cannot reach a stdio process running on a laptop. If your end users are not running Cursor locally, stdio MCP is not in your reach.

VedicAstroAPI ships a stdio wrapper that runs in a developer editor. Prokerala ships no MCP at any subdomain or platform.

What does multi-domain coverage actually cost

The real pricing question is not the per-call rate. It is what your monthly bill looks like once you cover every domain your app needs at the volume your app needs. Single-domain providers force you to stack subscriptions; multi-domain bundles fold every domain into one quota.

Two structural advantages over single-domain stitching. Domain coverage does not scale the bill: RoxyAPI Starter at $39 covers all 12 domains; adding tarot, numerology, or biorhythm costs zero extra dollars. With single-domain providers each new domain is a new subscription, a new auth header, a new bill. Per-request cost falls 6.7x as you scale, from $0.00156 at Starter to $0.00023 at Enterprise. Wallet-credit providers stay opaque: a kundli-heavy day on Prokerala can burn 10x more credits than a daily-horoscope-heavy day on the same wallet, so monthly cost is unprojectable.

Which provider should you choose

The right answer depends on what you are building. Use this as a decision tree, not a ranking. Each provider wins in a specific case; the goal here is to map your requirements to the best fit, not to crown a single winner.

Choose RoxyAPI when you need multiple spiritual domains under one key, you are building AI agents on hosted platforms (n8n, Dify, Make, Zapier, Lovable, Bubble, Wix, Bolt) where OAuth Bearer adds setup friction, you are shipping a chat experience on Telegram, WhatsApp, or Slack, you are integrating into WordPress or Next.js, you want flat per-request pricing with no credit math, you need a public reproducible accuracy benchmark, or you want to ship in 30 minutes by cloning one of the free MIT starter apps. Start with the quickstart guide for your first call in 60 seconds, or the AI prompts library for Cursor-and-Claude scaffolding.

Choose AstrologyAPI.com when you need the largest single-vendor endpoint catalog, your stack already speaks Java, .NET, Ruby, or Android (their SDK matrix is broader than ours), or your team is willing to run an OAuth Bearer dance on every hosted MCP connection.

Choose Prokerala when you only need Vedic, you need PDF reports as a delivered artifact, you are shipping into the WordPress install base where their plugin has 600+ live installs since 2021, or you need South Indian regional features (Tamil Porutham, Kerala Porutham, multi-tradition calendar). If you also need Western or numerology coverage from the same vendor, the Vedic Astrology API plus Western Astrology API in one RoxyAPI subscription removes the need to stitch.

Choose VedicAstroAPI when you need Vedic depth with broad LLM-translation coverage, you want a stdio MCP wrapper for personal Cursor or Claude Desktop use (not hosted automation), or a 14-day free trial matters for your evaluation process.

Accuracy is a public claim or it is marketing

0.27 arcmin

Astrology APIs make accuracy claims constantly. Almost none publish a verifiable benchmark. RoxyAPI is the only provider in the four with a public MIT-licensed accuracy repository you can clone, run, and audit before signing up. The benchmark cross-references position output against NASA JPL Horizons DE441 (the same ephemeris reference used by professional astronomy applications) and reports both median and worst-case arcminute deviation.

The other three providers report no public accuracy methodology. Internal validation may exist; without a published reproducible benchmark there is no way to compare. For any application where calculation accuracy matters (Vedic dasha timing, KP cusp calculation, transit windows, returns), demand a benchmark you can audit. The public 828 gold-standard tests blog documents the verification methodology.

Frequently Asked Questions

Q: What is the most accurate astrology API in 2026? A: Accuracy depends on the underlying ephemeris and how openly the provider proves their numbers. Look for sub-arcminute precision validated against NASA JPL Horizons reference data with a public benchmark you can audit. RoxyAPI publishes 828 gold-standard tests with 0.27 arcmin median position error in a public MIT-licensed repository at github.com/RoxyAPI/astrology-api-benchmark. The other three providers in this comparison report no public accuracy methodology.

Q: Which astrology API supports both Vedic and Western astrology? A: All four providers in this comparison support both systems. RoxyAPI ships them as two of twelve domains under one key. AstrologyAPI.com sells them as separate paid suites. Prokerala leads with Vedic and adds basic Western. VedicAstroAPI covers both with broad LLM-translation language support.

Q: Is there an astrology API with tarot and numerology included in one bundle? A: RoxyAPI is the only provider that bundles astrology (Vedic and Western), tarot, numerology, I-Ching, dream interpretation, crystals, angel numbers, biorhythm, and location data under a single API key with flat per-request pricing. AstrologyAPI.com offers tarot and numerology as separate paid suites. Prokerala covers basic numerology but no tarot. VedicAstroAPI covers tarot but no numerology.

Q: What does MCP transport mean and is "having MCP" enough? A: MCP (Model Context Protocol) is the standard for connecting AI agents to external tools. The transport decides whether the MCP works on hosted platforms or only on a developer laptop. Remote Streamable HTTP plugs into n8n, Dify, Make, Zapier, Lovable, Bubble, Wix, Bolt, Telegram, WhatsApp, Slack, and IDE assistants in seconds. Local stdio only works on the local machine. RoxyAPI and AstrologyAPI.com ship remote Streamable HTTP. VedicAstroAPI ships local stdio. Prokerala ships no MCP. RoxyAPI uses X-API-Key matching the REST auth (no OAuth setup per platform); AstrologyAPI.com uses OAuth Bearer. Full transport reference: RoxyAPI MCP documentation.

Q: How much does an astrology API cost for a startup? A: Costs vary by pricing model. Free tiers exist (Prokerala 5,000 credits per month, VedicAstroAPI 14-day trial). Paid plans start at INR 999 per month for single-domain Vedic on a credit wallet (Prokerala) or $39 per month for multi-domain coverage across 12 spiritual domains on flat per-request pricing (RoxyAPI). Credit wallets make total cost unprojectable across endpoint mixes; flat per-request pricing makes it deterministic.

Q: Can I use an astrology API to build a dating or compatibility app? A: Yes. Compatibility and synastry endpoints are designed for this. All four providers in this comparison support birth chart comparison and aspect analysis between two charts. RoxyAPI ships POST /astrology/synastry for Western synastry and POST /vedic-astrology/compatibility for Vedic Guna Milan scoring. The astrology dating segment is one of the fastest-growing app categories in 2026.

Conclusion

The serious astrology API market in 2026 narrows to four providers. The right pick depends on whether you need single-domain Vedic depth (Prokerala or VedicAstroAPI), broad single-vendor endpoint catalog (AstrologyAPI.com), or multi-domain bundling with AI-native integration and public accuracy verification (RoxyAPI).

Ready to start building? Explore the RoxyAPI product catalog for all 12 domains, check pricing, dive into the interactive API reference, or jump straight into the 60-second quickstart. Per-domain product pages: Western Astrology, Vedic Astrology, Tarot, Numerology, I-Ching, Dreams, Crystals, Angel Numbers, Biorhythm, Location.