Real-time SEC 8-K material-event alert with stock ticker: ticker, exchange, company, CIK, event, severity, EDGAR link. id=latest (optional ?severity=critical) or an accession number from free GET /filings. Not charged if no match. Items: 1.03 bankruptcy, 1.05 cyber incident, 4.02 restatement, 2.04 debt acceleration, 2.06 impairment, 3.01 delisting, 4.01 auditor change, 5.02 exec departure. Checked every 10s.

Track a flight or aircraft by callsign, ICAO hex or registration - live position, type, owner and route

x402 endpoint trust report - repeated 402 probes, price stability, latency and Coinbase Bazaar usage

Bitcoin network status - block height and fee estimates in sat/vB from next block to 1 day

Brazilian national holidays for a year - date, name and weekday

HTTP security header audit for any URL - HSTS, CSP, clickjacking, referrer policy, cookies and a letter grade

Accessibility audit of a web page - missing alt text, unlabeled forms, link names, headings and a score

Brazilian bank list - ISPB, Banco Central code and legal name for every institution

Add days or business days to a date - calendar or weekday offset from a start date, returns the resulting date and weekday

Age calculator from birthdate - exact age in years, months and days, total days lived and days until the next birthday

Compound interest calculator - final balance, interest earned and year-by-year growth for a principal, rate, years and optional monthly contribution

Days between two dates calculator - total days, weeks, years-months-days and business days between any two dates

Cemetery and burial-site reference - identity, coordinates, inception and official links (Wikidata)

Lichess daily chess puzzle - FEN position, rating, themes and UCI solution moves

ROI calculator - return on investment percent, gain, multiple and annualized return from amount invested and returned

Who represents a U.S. street address - congressional district, senators, House member and state legislators

Profit margin and markup calculator - margin percent, markup percent and profit from cost and price, or the price for a target margin

Savings goal calculator - months to reach a target from monthly savings, current balance and interest rate

URL parser - scheme, host, port, path segments, query parameters and fragment from any absolute URL

Unix timestamp converter - unix seconds or milliseconds to ISO 8601 date, weekday and day of year, or a date to unix time