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.

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 (planets mostly within 0.03 deg, cusps within 0.01 deg, 1950-2024). Executed via the paid HTTP endpoint https://logigrain.net/api/seiyo (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  astrologynatal charthoroscopeephemeris西洋占星術
• 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 library on 3,000 random datetimes. Executed via the paid HTTP endpoint https://logigrain.net/api/shichu (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  bazifour pillarschinese astrology四柱推命
• 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 via the paid HTTP endpoint https://logigrain.net/api/kyusei (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  nine star kikyusei九星気学
• 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 leap-month convention. Executed via the paid HTTP endpoint https://logigrain.net/api/shibu (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  zi wei dou shupurple star astrology紫微斗数
• 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 aware. Executed via the paid HTTP endpoint https://logigrain.net/api/moon (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  moonlunar phasefull moonnew moon月齢
• 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 endpoint https://logigrain.net/api/era (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  japanese erawarekicalendar和暦
• 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/deferral rates, fuka-nenkin. Returns the rule year used and a quotable sentence; asks for the contribution record instead of guessing; warns when parameters are stale. Executed via the paid HTTP endpoint https://logigrain.net/api/nenkin (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  japanpensionnenkin老齢基礎年金
• 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 Japanese life table (令和7年簡易生命表, by sex), and expected lifetime total for each start age 60-75. Returns the rule year used, assumptions, what would change the answer, and a quotable sentence. Totals cross-checked by an independent implementation. Executed via the paid HTTP endpoint https://logigrain.net/api/nenkin-deferral (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  japanpensiondeferrallife table繰下げ生命表
• 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-value limit (成長 up to 12M). Selling frees the book value (cost), not the sale price, from the next year. Returns the rule basis, assumptions, what would change the answer and a quotable sentence; asks for book values instead of guessing. Rules checked against the FSA NISA site. Executed via the paid HTTP endpoint https://logigrain.net/api/nisa (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  japannisatax-free investmentlimits新NISA
• 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 Base); this A2A interface returns the exact request to make.
  financecompound interest
• 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 on Base); this A2A interface returns the exact request to make.
  currencyexchange rateforex
• Unit conversion
  Unit conversion: length, weight, speed, data, area, volume, energy, temperature. Executed via the paid HTTP endpoint https://logigrain.net/api/convert-unit (x402, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  unit conversionmeasurement
• 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 Base); this A2A interface returns the exact request to make.
  jsonvalidationformatting
• 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, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  mathcalculatorexpression
• 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 interface returns the exact request to make.
  syntaxvalidationhtmlcssjson
• 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 interface returns the exact request to make.
  forexcryptoprices
• 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 call on Base); this A2A interface returns the exact request to make.
  datecalendarbusiness days
• 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, $0.001 USDC per call on Base); this A2A interface returns the exact request to make.
  probabilitybayescombinatorics

How to call

https://logigrain.net/a2a

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