Spanish tax ID validation (DNI/NIF, NIE and company CIF) with check-digit verification. Computed locally; the ID is not stored.

Convert units of length, mass, volume, area, speed, temperature, data (KB vs KiB), energy, pressure, time and power, metric and imperial, with exact factors.

Hyperliquid liquidation map for one coin: long/short notional of the most active accounts, liquidation-price bands by distance from mark (2% steps to ±20%), nearest liquidation clusters above and below, confirmed liquidations in the last 24h. Coverage of open interest reported. Market data only — not investment advice.

Detect which email service a domain uses (Google Workspace, Microsoft 365, Zoho, Proton, OVH, IONOS...) from its MX and SPF records, plus corporate spam filters and other senders. For B2B sales and audits.

Monthly US federal receipts, outlays and deficit (or surplus), plus the trailing 12-month deficit, from the Monthly Treasury Statement. US Treasury, public domain.

CipherOwl ExpressScan Deep: four-hop risk report with reasons, graph and PDF. One address per request. Seven-day same-address rechecks. Website: https://x402.cipherowl.ai. Response example is illustrative, not a live result or valid payment receipt.

US labor market: unemployment rate, nonfarm payrolls with monthly job change, and average hourly earnings with annual growth. US Bureau of Labor Statistics, public domain.

TLS certificate of a domain: issuer, validity dates, days until expiry, names covered (SAN), whether it matches the domain and is trusted, TLS version and cipher. For uptime and security monitoring.

Euro area AAA government bond yield curve (zero-coupon, 3 months to 30 years) estimated by the ECB, with change in basis points versus N days ago and the 10y-2y slope.

Crypto options from Deribit (BTC, ETH): ATM implied-vol term structure, 25-delta risk reversal and butterfly, put/call open-interest and volume ratios, max pain per expiry, DVOL and its 24h change. Market data only — not investment advice.

Options max pain, open interest and put/call ratio for one Deribit expiry (default: the next expiry with open interest), BTC or ETH. Market data only — not investment advice.

Validate a securities ISIN (ISO 6166): format, check digit, issuing country and embedded CUSIP (US/CA, with its own check) or SEDOL (GB/IE). Computed locally; nothing stored.

Read the codes in an image URL: QR, Data Matrix, Aztec, PDF417, EAN-13, UPC, Code 128, Code 39... with format, content and position; flags URLs, crypto payment URIs (bitcoin:, ethereum:, solana:) and wifi credentials.

Population on 1 January of every European country (ranking) or the evolution of one with annual growth. Official Eurostat data.

Food product facts by barcode (EAN/UPC) from Open Food Facts: name, brand, quantity, Nutri-Score, NOVA processing group, Eco-Score, nutrients per 100 g, allergens, additives, ingredients and countries.

Metadata of a publication by DOI (Crossref): title, authors, journal or publisher, year, type, citation count, references, license, link and an APA-formatted citation.

Savings or investment plan with monthly contributions and compound interest: final value, total contributed, interest earned, value in today's money after inflation, yearly evolution and the monthly amount needed to reach a goal.

Search scholarly literature across all fields in OpenAlex (250M+ works): title, authors, institutions, year, journal, citation count, DOI and open-access link; by relevance, citations or date.

Spanish postal code lookup (5 digits): municipality at the code's central point, province, region, INE code and coordinates. Official CartoCiudad (IGN) data, CC BY 4.0. Spain only.

Space weather now from NOAA SWPC: geomagnetic Kp index (recent hours and max), storm level (G0-G5), latest solar X-ray flares, solar wind speed and active alerts. Affects satellites, GPS and power grids.