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Omikuji API

Validate IBAN structure and MOD-97 checksum. Does not establish account ownership, beneficiary identity or absence of fraud.

Spot Check. REQUIRES ?host= on the paid request — a signed request without it is refused before the gate and no money moves. Name a host and get what this observatory already holds on it, signed: corpus rounds and verdicts as recorded, when we last actually knocked, our coverage of the window since we met it, and the gaps with their reasons. Read from the books at the counter — no request is made

Parse RSS/Atom feeds into structured JSON. Pay per call with USDC (x402) or credits - archtools.dev

Live feed of every active rail disruption across the Japanese (JP) network in one call — delays and suspensions with bilingual summaries, refreshed continuously from ODPT. Built for MONITORING agents: poll on an interval (e.g. every 5 minutes) to maintain a nationwide incident watchlist without querying stations one by one.

Official public holidays by country and year, with regional subdivisions, localized names and normalized dates.

Japanese traditional calendar for a date: rokuyo (taian/butsumetsu... lucky days used for weddings, funerals, contracts), Japanese era (Reiwa) date, old lunisolar calendar date incl. leap months, 24 solar terms (sekki) and year eto. Verified against the National Astronomical Observatory of Japan.

Beer, wine and cider alcohol by volume from original and final gravity, with both standard formulas and attenuation.

Age in years, months, days and days lived, Korean and East Asian ages, next birthday with leap-day rules, and zodiac.

Complex number arithmetic, modulus and argument, integer powers, square root and n-th roots, in rectangular and polar form.

Asteroids and comets passing Earth within a lunar-distance limit in the next or last N days: distance, speed, size range.

Determinant of a square matrix (up to 10x10) by LU with partial pivoting, flagging a numerically singular matrix.

Board feet for lumber from thickness, width, length and quantity (nominal sizes), with total cost at a price per board foot.

Estimate quarter-mile time and trap speed from weight and horsepower (Hale), plus a power-limited lower bound for 0-60 mph.

Great-circle distance (miles, km, feet, nautical miles) and initial compass bearing between two latitude/longitude points.

Score needed on a final exam (or any remaining work) to reach a target class grade, from current grade and its weight.

Tip and even bill split in exact cents: tip on subtotal or total, shares that add up, optional round up to whole dollars.

Density altitude from field elevation, altimeter setting and temperature, exact and by rule of thumb, with a performance flag.

How many identical boxes fit inside a larger box or crate: best of six orientations in a simple grid, with utilization.

Compare two packaged foods by barcode: Nutri-Score, NOVA, and per-100 g energy, sugars, saturated fat, salt, fibre and protein.

Add or subtract N business days from a date, skipping weekends and your holiday list, WORKDAY style.

Check whether two words or phrases are anagrams, ignoring case, spaces, punctuation and accents; shows the letter differences.

Carbon-to-nitrogen ratio of a compost mix by the Cornell formula, or the greens-to-browns amounts that reach a target ratio.

Signatures, press sheets and blank pages needed for a book of N pages at 4, 8, 16 or 32 pages per signature.

Sheet-metal bend allowance, outside setback, bend deduction and flat length from angle, radius, thickness and K-factor.

Exact age from a birth date: years, months, days, total days, weeks and hours, birth weekday and days to the next birthday.

Wax and fragrance oil weights for container candles from jar size, fill level, wax density and fragrance load.

Aquarium volume in US gallons and litres from inside dimensions, usable water after substrate, and the water's weight.

Latest NDBC buoy observation: wind, gust, waves, swell, pressure and water temperature, with a Beaufort and sea-state screen.