# LogiGrain

> Deterministic astronomy, calendar, divination and Japanese public-system calculations (Western astrology, Four Pillars, Nine Star Ki, Zi Wei Dou Shu, moon phase, Japanese era, Japanese public pension) plus utility math. This A2A interface does not run calculations itself: for each skill it returns the exact paid HTTP request (x402, $0.001 USDC per call on Base mainnet) that produces the result. Send a data part {"skill": "<skill id>", "params": {...}} or a short text naming the skill.

- **Domain**: `logigrain.net`
- **Provider**: LogiGrain (https://logigrain.net)
- **A2A protocol version**: 1.0
- **Kind**: paid_api
- **Category**: other
- **Live-responds (last probe)**: True
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 100%
- **Payment protocol**: x402 · network `eip155:8453` · ≥ $0.001
- **Wallet**: `0x716fde0dac4ef6ed2018206d43697c6bb71d7eb3`

## Skills
- **Western astrology natal chart** — Western astrology natal chart (西洋占星術): Sun-Neptune longitudes and signs, ASC/MC, Placidus and whole-sign houses, aspects. Verified against Swiss Ephemeris (plan
- **Four Pillars / BaZi** — Four Pillars / BaZi (四柱推命): year, month, day and hour pillars with solar-term boundaries in JST. Pillars cross-checked against an independent Chinese-calendar l
- **Nine Star Ki** — Nine Star Ki (九星気学): main star and monthly star with solar-term boundaries computed astronomically (within about 15 minutes, 1900-2150), Japan time. Executed vi
- **Zi Wei Dou Shu chart** — Zi Wei Dou Shu (紫微斗数) natal chart: lunar date, 命宮/身宮, 五行局, 14 major stars, auxiliary and malefic stars, 四化, 大限, optional 流年. Lunar-new-year boundary; documented
- **Moon phase** — Moon phase from a true ephemeris: age, illumination, phase name (Japanese/English), next full and new moon date and time (within about 2 minutes), timezone awar
- **Japanese era (wareki) conversion** — Japanese era (wareki: 令和/平成/昭和/大正/明治) to Gregorian and back, with real-date and era-start validation, plus Japanese fiscal year. Executed via the paid HTTP endp
- **Japanese public pension estimate** — Japanese public pension estimate (老齢基礎年金) using official parameters for the current fiscal year (FY2026 full amount 847,300 yen): exemptions, early claim/deferr
- **Pension start-age decision (break-even and survival)** — When to start the Japanese public pension: break-even age of early claim or deferral versus a baseline, probability of living to that age from the official Japa
- **Japan new NISA remaining limits** — Japan new NISA limits: how much can still be bought this year and next year under the annual limits (つみたて 1.2M / 成長 2.4M yen) and the 18M-yen lifetime book-valu
- **Japan mortgage tax deduction (住宅ローン控除)** — Japan mortgage tax deduction (住宅ローン控除) for move-ins 2026-2030 under the FY2026 reform: borrowing limit and 13/10-year period by new/resale/used, performance cla
- **Compound interest** — Compound interest with optional monthly contributions. Executed via the paid HTTP endpoint https://logigrain.net/api/compound (x402, $0.001 USDC per call on Bas
- **Currency conversion** — Currency conversion using live exchange rates (cached 60 s). Executed via the paid HTTP endpoint https://logigrain.net/api/convert (x402, $0.001 USDC per call o
- **Unit conversion** — Unit conversion: length, weight, speed, data, area, volume, energy, temperature. Executed via the paid HTTP endpoint https://logigrain.net/api/convert-unit (x40
- **JSON validate / format / minify** — JSON validate, format or minify, with key count and depth. Executed via the paid HTTP endpoint https://logigrain.net/api/json (x402, $0.001 USDC per call on Bas
- **Math expression evaluation** — Safe math expression evaluation (no code execution): functions, constants, variables. Executed via the paid HTTP endpoint https://logigrain.net/api/math (x402, 
- **Syntax check** — Syntax check for JSON, HTML and CSS snippets. Executed via the paid HTTP endpoint https://logigrain.net/api/code (x402, $0.001 USDC per call on Base); this A2A 
- **Live forex / crypto prices** — Live forex rates or crypto prices (cached). Executed via the paid HTTP endpoint https://logigrain.net/api/feed (x402, $0.001 USDC per call on Base); this A2A in
- **Date calculations** — Date difference, add days, Unix timestamp conversion, weekday count. Executed via the paid HTTP endpoint https://logigrain.net/api/date (x402, $0.001 USDC per c
- **Probability (Bayes, combinations, permutations)** — Bayes theorem, exact combinations and permutations (big-integer exact result). Executed via the paid HTTP endpoint https://logigrain.net/api/probability (x402, 

## URLs
- Agent card: https://logigrain.net/.well-known/agent-card.json
- Page (HTML): https://agenstry.com/agents/logigrain.net
- Documentation: https://logigrain.net/llms.txt