HMAC signature x402 REST usage
Compute an HMAC of a message with a key using SHA-256 (default), SHA-1, SHA-384 or SHA-512, in hex and base64. Use to check webhook signatures. The key is used only for this call and is not stored.
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Compute an HMAC of a message with a key using SHA-256 (default), SHA-1, SHA-384 or SHA-512, in hex and base64. Use to check webhook signatures. The key is used only for this call and is not stored.
Details of an IPv4 network in CIDR notation: network and broadcast address, first and last usable host, netmask, number of addresses, and whether a given IP falls inside. Use for firewall rules and allowlists.
MIME (content) type for a file name or extension, e.g. report.pdf → application/pdf, and whether browsers usually display it inline. Use when uploading or serving files.
Write a whole number (up to trillions, negatives allowed) out in English words, e.g. for cheques and invoices. Also returns the cheque form with 'and' cents when given a decimal amount. Use when amounts must be written o...
Compare two semantic versions (1.2.3, pre-releases like 2.0.0-rc.1 handled by the SemVer rules) and get which is newer, plus the next major, minor and patch versions of the first. Use to decide whether an upgrade is a ma...
Find all email addresses, URLs, phone-number-like strings, hashtags, @mentions and numbers in a text, each list de-duplicated. Use to pull contacts and links out of scraped pages or messages.
Convert between units of length, mass, volume (incl. US cups and gallons), temperature (c, f, k), speed, area, data size (kB vs KiB), time, energy and pressure. Example units: km, mi, lb, kg, floz, ml, mph, kn, acre, gib...
Convert a Unix timestamp (seconds or milliseconds, detected automatically) to ISO date and time, or an ISO date to a Unix timestamp. Without input, returns the current time in both forms. Use to read timestamps in logs a...
Check an IBAN's format, its country-specific length and its mod-97 check digits, and return it formatted in groups of four. Use before saving bank details or paying out.
Check an ISBN-10 or ISBN-13 check digit and convert valid ISBN-10s to ISBN-13. Hyphens and spaces are ignored. Use before cataloguing or ordering books.
AI-generated text detector for European Portuguese (PT-PT): Binoculars method calibrated on Portuguese texts (AUROC 0.94, 1.7% false accusations). Returns a probability level, never proof. Text is not stored.
Argentina official gazette (Boletin Oficial) keyword search returning literal excerpts of matching notices with dates and source URLs; an optional date limits the search to that day's notices. Use this when an agent need...
Keyword and autocomplete suggestions for any seed query. Aggregates Wikipedia OpenSearch and DuckDuckGo autocomplete (both public, no auth) into a de-duplicated ranked list — useful for SEO keyword research, content-gap...
Summarize text: send any text, get a short summary written by Claude, with a word limit you choose.
PDF to text: give a PDF URL, get the text of every page with the title, author and page count. For RAG, research and summarizing reports, filings and papers.
Text classification API: classify text into your own labels with an LLM, returns the best label and a one-line reason.
Regex tester, test. Run a JavaScript regular expression against a text and return every match with its index and capture groups (named groups included). Pattern up to 300 characters, text up to 5,000; patterns with neste...
PII detection and redaction. Find personal data in a text and get it back redacted: emails, phone numbers, card numbers (Luhn-checked), IBANs (mod-97), US SSNs, IP and crypto wallet addresses, each with its position, plu...
Turns text into speech with Amazon Polly and returns a signed URL of the audio, valid for an hour. Up to 3000 characters with standard voices or 1000 with neural ones. Voices include Joanna, Matthew (English), Mizuki, Ta...
Language detection. Detect which language a text is written in: the most likely language with its ISO 639-3 and 639-1 codes and English name, plus the next candidates with relative scores, using trigram statistics for 82...
Translate text for AI agents - POST any text up to 2,000 chars with a target language, get clean JSON back: the detected source language + the full translation, never prose. Any language pair - Spanish, French, German, J...
Give a URL, get a short summary of the page plus three to six key points, ready to drop into an agent's context. Fetches the page, strips navigation and boilerplate, and summarizes the main text with an LLM. HTML pages o...
Lorem ipsum generator. Lorem ipsum placeholder text: 1-20 paragraphs of 1-10 sentences, starting with the classic "Lorem ipsum dolor sit amet". The same seed always gives the same text. Use to fill mock-ups, templates an...
Morse code translator. Translate text to international Morse code (letters separated by spaces, words by /) or Morse code back to text; the direction is detected automatically or set with mode. Letters, digits and common...