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Validate an Argentine bank account number (CBU) or virtual account (CVU): checks both check digits offline and returns type, entity/branch codes, bank name for major banks and a formatted value. Send {cbu}. Nothing is stored.

Validate an Argentine tax ID (CUIT/CUIL): checks length, prefix and modulo-11 check digit offline, and returns normalized and formatted values plus entity type (person/company). Send {cuit}. Nothing is stored.

Current Argentine dollar quotes (ARS per USD): oficial, blue, bolsa (MEP), contado con liquidacion (CCL), mayorista, cripto and tarjeta, with buy/sell, spread, update time and the blue vs oficial gap. Send {} for all or {casa} for one. Source failure = no charge.

Argentine national holidays (feriados, incl. puentes turisticos) for a year, and optionally a date check: weekday, holiday name, is_business_day, next business day, and date + N business days (skips weekends and holidays). Send {} for this year, {year}, or {date, add_business_days}. Source failure = no charge.

Argentine consumer price inflation from INDEC: latest monthly %, year-over-year %, last 12 months, and optionally the compounded cumulative inflation between two months with an amount adjusted for inflation (rent, salary, price updates). Send {} or {from: YYYY-MM, to: YYYY-MM, amount}. Source failure = no charge.

Parse and normalize an Argentine phone number written in any local style (011 15 1234-5678, +54 9 11..., 0351 4..., 15 prefix): strips trunk 0 and mobile 15, returns the 10-digit national number, E.164 in landline (+54) and mobile (+549) forms, a wa.me WhatsApp link and whether it is a mobile. Offline, nothing is stored. Send {phone}.

Daily mid-market exchange rate between two fiat currencies (ISO 4217, e.g. USD, EUR, ARS, BRL, JPY) with optional amount conversion, from blended central-bank reference rates (ECB and others, via Frankfurter). Send {from, to, amount}. Unsupported currency = no charge.

Generate a complete, responsive single-file HTML landing page for a small business: hero, services, WhatsApp/email call to action, contact section and footer, with inline CSS and SEO meta tags. Send business_name (required) plus optional tagline, description, services, city, whatsapp, email, language (es|en), color and cta_text. Returns JSON {html, filename}. Deterministic template, nothing is stored.

Encode UTF-8 text to Base64 (standard or URL-safe without padding) or decode Base64/Base64url back to UTF-8. Send {text, mode: encode|decode, url_safe}. Nothing is stored.

Hash UTF-8 text (up to 3500 chars) with SHA-1, SHA-256, SHA-384, SHA-512 or all of them; returns hex and base64 digests plus the input as base64 and hex. Send {text, algorithm}. Nothing is stored.

Returns the caller's public IP address as seen by Cloudflare, with approximate country, region, city, timezone, ASN and network operator, TLS and HTTP version. Send {}. Also a minimal end-to-end test for an x402 client on Base or Polygon.

Keccak-256 (Ethereum flavor) of UTF-8 text or hex bytes; for a function signature like transfer(address,uint256) also returns the 4-byte selector. Send {text, encoding}. Nothing is stored.

Cryptographically secure random numbers: 1-100 unbiased integers in [min, max] plus up to 256 random bytes as hex. Send {} or {min, max, count, bytes}. Defaults: one integer 0-100 and 16 bytes.

Turn any text (Spanish, Portuguese, French, German accents handled) into a clean URL slug with - or _ separator and optional max length. Send {text, separator, max_length}.

Text statistics for any language: words, characters with and without spaces, sentences, paragraphs, lines, average word length, reading time and top 10 words. Send {text} (up to 3500 chars). Nothing is stored.

Trusted current time: UTC ISO 8601, unix seconds and milliseconds, plus local time, UTC offset and weekday in any IANA timezone (e.g. America/New_York). Send {} or {timezone}. Also a minimal end-to-end test for an x402 client on Base or Polygon.

Generate 1-50 random UUIDs, version 4 (random) or 7 (time-ordered), from a cryptographically secure RNG. Send {} or {count, version}. Also a minimal end-to-end test for an x402 client on Base or Polygon.

Quick technical and SEO audit of a public web page: HTTPS and redirect, status, response time, title and meta description, viewport (mobile), h1, canonical, Open Graph, alt text, structured data, compression and security headers. Returns a 0-100 score, grade and prioritized issues. Send {url}. Charged only if the page could be fetched.