other

Invert a square matrix via Gauss-Jordan elimination. A non-square, ragged or empty matrix is a clean 400. A singular (non-invertible) matrix is NOT an error — it returns a successful { invertible:false, inverse:null }.

Compute the determinant of a square matrix via Gaussian elimination with partial pivoting. A non-square, ragged or empty matrix is a clean 400; a singular matrix simply returns 0.

Generate an RFC 4226 counter-based HMAC one-time password from a base32 secret and counter. Configurable digits (6–10, default 6) and algorithm (SHA1/SHA256/SHA512, default SHA1). An invalid base32 secret is a clean 400.

Solar storm API: the last 30 days of solar flare events — class (A/B/C/M/X), begin/peak/end times, and source region — the space weather that degrades GPS, satellite communications, and power grids. Use for infrastructure-risk monitoring, aviation/comms planning, and science agents. Cached 3 hours.

US House financial-disclosure filing index: every filing by members and candidates — periodic transaction reports, annual reports, amendments, extensions — with filer, state/district, filing type, date, and a direct PDF link. Filter by member, state, type, or year. Filing velocity is itself a signal: a burst of trade reports precedes the parsed rows appearing.

Medical device recall search over official US enforcement reports: category 'device' plus a keyword returns recalled devices with severity class, defect reason, firm, distribution, and dates. Class I entries flag reasonable probability of serious harm — surface those first.

Near-earth object feed: asteroids passing close to Earth this week — name, size estimate, closest-approach date and distance, relative velocity, and potentially-hazardous flag, as normalized JSON. For risk, science, and content agents.

Official US food recall search: enforcement reports matching a product keyword with severity class, contamination or mislabeling reason, recalling firm, distribution pattern, and dates — newest first as structured JSON. Check ingredients, brands, or categories before recommending or purchasing.

US drug recall lookup from official enforcement reports: pass category 'drug' and a product keyword to get recalled medications with severity classification, reason (contamination, potency, labeling), recalling firm, and distribution scope. Also covers supplements sold as drugs.

Financial disclosure filings by US House members and candidates as structured JSON: who filed what and when, with filing type codes explained (trade reports, annual reports, blind trusts, terminations) and a direct link to each official PDF. Filter by member name, state or district, filing type, or year; sorted newest first.

Recent solar flare activity over the past 30 days, classified by intensity with timing and source region for each event — the underlying cause of GPS drift, satellite communication glitches, and grid instability. Useful for infrastructure monitoring and risk-planning agents that want early signal on space weather impact. Cached 3 hours.

Food, drug, and medical-device recall search: official US enforcement reports by category and product keyword — severity classification (Class I most serious), reason for recall, recalling firm, distribution area, and dates, newest first. Zero matches is a real answer, not an error. For food-safety, pharmacy, supplement, and commerce agents.

The last 30 days of solar flare events by class (A through X), with begin, peak, and end times and the source active region — the space weather that can disrupt GPS accuracy, satellite links, and power grids. For infrastructure-risk monitoring and aviation or communications planning agents. Refreshed every 3 hours.

STOCK Act filing tracker: the index of periodic transaction reports and related financial disclosures filed by US House members, with filer name, district, filing date, and official document link. Watch a specific member for new trade filings, or scan a state delegation's disclosure activity in one call.

Common problems lookup for US vehicles: aggregates every owner-filed defect report into the definitive ranked list of trouble spots — transmission, airbags, brakes, electrical — with complaint counts, percentage share, and crash/fire severity totals. Built for used-car advisors and mechanic triage agents.

Top failing components for any vehicle: the complete consumer complaint file for a year/make/model distilled into a ranked component-failure table with counts and share percentages, plus severity totals. VIN input is auto-identified. The single-call answer to 'what goes wrong with this car?'

Car reliability report computed from the full official defect-complaint record: which components fail most on a given year/make/model, how often, and how severe (crashes, fires, injuries, deaths). Ranked structured JSON — compare two candidate used cars side by side before recommending either.

Generate an RFC 6238 time-based one-time password from a base32 secret. Uses the current time by default, or an explicit unix timestamp (seconds); configurable period (default 30s), digits (default 6) and algorithm (default SHA1). Also returns the counter and seconds remaining in the window.

Least common multiple of two or more positive integers (arbitrary precision).

Present value of a future sum and/or a level annuity, given a per-period rate and number of periods. Set dueAtBeginning=true for an annuity-due.

Rebuild a nested object from a single-level object whose keys are delimited paths (default delimiter `.`) — the inverse of flatten. Requires a flat object.

Flatten a nested object/array into a single-level object whose keys are the delimited paths to each leaf (default delimiter `.`). Requires an object or array.

Greatest common divisor of two or more non-negative integers (arbitrary precision).

Parse an A1-style cell reference (e.g. "B3" or "$AA$100") into 1-based row and column numbers, plus the column letters and whether each part is absolute.