179 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
JSON validator, validate JSON. Check whether text is valid JSON. Returns valid true/false, the parsed value's type and size, and for invalid input the error message with line and column. Use before parsing an LLM's or an...
Markdown to HTML. Convert Markdown (headings, paragraphs, bold, italic, strikethrough, links, images, inline and fenced code, lists and task lists, tables, quotes, rules) to HTML. Raw HTML in the input is escaped, so the...
Roman numerals. Convert a number (1-3999) to Roman numerals, or Roman numerals back to a number. Give either number or roman. Use for dates, outlines and puzzles.
Ping, x402 payment test. A paid round-trip check: returns pong and the server time. Use to test that an x402 wallet, client or MCP setup can pay and receive a result.
URL encode. Percent-encode text for use in a URL query value (encodeURIComponent) and as a full URL (encodeURI). Use when building query strings.
URL parser, parse a URL. Split a URL into protocol, host, port, path, query parameters (as an object), hash and origin, and report whether the host is an IP address. Use to read query parameters or check a link's host.
UUID generator, ID generator. Generate 1 to 100 random version-4 UUIDs from a cryptographic random source. Use for IDs, idempotency keys and test data.
JSON repair. Fix JSON as LLMs often write it: removes ```json fences and surrounding prose, comments and trailing commas, converts single quotes, quotes bare keys, maps True/False/None, and closes unclosed brackets. Retu...
JWT decode. Decode a JSON Web Token's header and payload without verifying the signature, and report issued-at, not-before and expiry as dates and whether it has expired. The token is not stored. Do not use the result to...
Slugify, make a URL slug. Turn any text into a URL-friendly slug: accents removed (é→e, ß→ss), lower case, non-alphanumerics replaced by a separator (- by default). Use for file names, URLs and IDs.
Text diff, compare two texts. Line-by-line difference between two texts: each line marked as unchanged, removed or added, with counts. Use to see what changed between two versions of a document, config or prompt.
Word count and readability. Count characters, words, sentences and paragraphs, estimate reading and speaking time, and compute the Flesch reading-ease score and grade level for English text. Use to check the length and r...
SHA-256 hash/digest of a text string — also sha512 and sha3-256; returns hex.
Live USGS river-gauge tick, deterministic. Answers "what is the flow at this gauge right now", "is this river high or low vs this week". Returns the latest streamflow (discharge, cfs) and gage height (ft) for one USGS si...
Markdown table from CSV. Convert CSV (comma, semicolon, tab or pipe, detected automatically; quoted fields supported) into a GitHub-flavoured Markdown table, with number columns right-aligned, pipes escaped and line brea...
Returns the message you send, with its length and the server time. Use to test an x402 client, payment flow or agent tool wiring end to end.
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.
Reference facts for paying and reading on Base mainnet: chain id, native USDC contract and decimals, block explorer and public RPC URLs, and the x402 network identifier. Use to configure an x402 or Base client.
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 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...