General Utilities x402 offerings

IPv4 octets: pure calculation, no network call. Integer octets. $0.01 per call.

IPv4 sort key: pure calculation, no network call. Zero-padded sortable form. $0.01 per call.

IPv6 binary: pure calculation on the address, no network call. Binary form. $0.01 per call.

IPv6 compress: pure calculation on the address, no network call. Shortest RFC 5952 form. $0.01 per call.

IPv6 eui64 mac: pure calculation on the address, no network call. The MAC address behind an EUI-64 interface id, if any. $0.01 per call.

IPv6 expand: pure calculation on the address, no network call. Full 8-hextet form. $0.01 per call.

IPv6 hextets: pure calculation on the address, no network call. The 8 hextets. $0.01 per call.

IPv6 to ipv4 if mapped: pure calculation on the address, no network call. The embedded IPv4 for ::ffff: mapped addresses. $0.01 per call.

Change watch for is ko fi com down: runs the check, compares it with the result from your previous call for the same query (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

Change watch for is proton me down: runs the check, compares it with the result from your previous call for the same query (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

Change watch for is sling com down: runs the check, compares it with the result from your previous call for the same query (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

Validate an ISBN-10 or ISBN-13 checksum (hyphens/spaces ignored) and report which format it is.

Render Markdown (tables, code, lists, headings) into a styled PDF (custom CSS, A4/Letter/Legal, page numbers), a Word DOCX or standalone HTML; returns a private download link valid for 24 hours. External resources are never fetched (inline data: images only).

Look up a product barcode number: identify and validate EAN-13, EAN-8, UPC-A, UPC-E, GTIN-14, ISBN-13/10, ISSN and ISMN codes (wrong check digits are reported with the correct digit), convert between forms (GTIN-14, EAN-13, UPC-A, ISBN-10 <-> 13) and decode the GS1 prefix. Then fetch product data from open databases: name, brand, quantity, categories, image, labels, Nutri-Score (food, cosmetics, pet food via Open Food Facts) or title, authors, publisher and cover (books via Open Library).

Get the ISO 8601 week number, ISO day-of-week, quarter, and day-of-year for any date. Useful for fiscal/reporting calendars, weekly aggregations, and sprint planning.

Fuzzy-search countries, currencies and languages by name or code. Scope with `registry` (defaults to all). Matches are ranked exact-code/name → prefix → substring.

Look up an active ISO 4217 currency by its alphabetic code or numeric code. Provide exactly one field. Returns the code, numeric code, name and number of minor units (decimal places).

Look up a language by its ISO 639-1 alpha-2 code, ISO 639-2 alpha-3 code (bibliographic or terminologic) or English name. Provide exactly one field.

Lookup country name from a static ISO3166-1 alpha-2 table subset. Call when labeling country codes offline. Returns name and code as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Tell whether a given date is a Japanese business day. Japanese national holidays and business-day calculations derived from the Cabinet Office official CSV. Returns holidays for a given year, plus business-day arithmetic used by invoicing, logistics and HR systems in Japan.

Tell whether a given date is a Japanese business day. Japanese national holidays and business-day calculations derived from the Cabinet Office official CSV. Returns holidays for a given year, plus business-day arithmetic used by invoicing, logistics and HR systems in Japan.

List all Japanese national holidays (JA/EN names) for a year, from official Cabinet Office data. 日本の祝日一覧と祝日名。

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. 日本の暦、六曜、和暦、二十四節気を取得。

Is a given date a business day in Japan? Returns weekday/holiday status, official holiday name (JA/EN) and next/previous business day. Source: Cabinet Office of Japan. 日本の営業日判定、祝日名、次と前の営業日。