the402 x402 endpoint directory

Parse an IPv4 or IPv6 address and classify it — version, normalized form and RFC range (unicast, private, loopback, li

Draw a random sample from a provided array — without replacement by default (a fair shuffle), or with replacement when

Generate a random string of a given length from a named charset (alphanumeric, alpha, lower, upper, numeric, hex, base

Generate one or more uniformly-distributed random integers in an inclusive [min, max] range.

Generate cryptographically-secure random bytes, returned as hex, base64 or base64url.

List the supported units and their metadata (abbreviation, measure, system, singular/plural names), optionally filtere

Convert a value between units — length, mass, volume, temperature, area, speed, pressure, energy, power, digital stora

Diff two texts. The default `unified` mode returns a unified-diff patch string; `lines`, `words`, and `chars` modes re

Decode a base64, base64url, hex, base32, or URL percent-encoded string back into UTF-8 text. Malformed input for the c

Encode a UTF-8 string into base64, base64url, hex, base32, or URL percent-encoding.

Recase a string into camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case, Sentence case,

Compute a keyed HMAC of some data with a secret key — the standard way to sign and verify webhooks (Stripe, GitHub, et

Compute a cryptographic digest (SHA-2, SHA-3, BLAKE2, and legacy SHA-1/MD5/RIPEMD-160) of some data. The input may be

Resolve a filename, path or extension to its MIME type, charset and full Content-Type.

Convert text into a URL-safe slug: transliterate accents, apply a locale character map, and join with a separator.

Test whether a version satisfies a semver range (^, ~, x-ranges, ||, hyphen).

Compare two semantic versions and report which is greater (precedence-aware).

Parse a semantic version into major/minor/patch, prerelease and build metadata.

Build a valid .ics document from event fields (summary, start/end, location, …).

Expand an RRULE recurrence rule into its occurrence datetimes, with a human-readable description.

Parse an .ics document into structured calendar events (summary, times, location, RRULE, attendees).

Generate a secure random password (characters) or a wordlist passphrase.

Estimate password strength: score, guesses, crack-time and feedback. Never stored.

Find the nearest CSS named color to a given color, by perceptual distance.

Generate a harmony scheme (complementary, analogous, triadic, tetradic, monochromatic) from a base color.

Compute the WCAG 2.1 contrast ratio between two colors and whether it passes AA/AAA.

Parse any CSS color and return it as hex, rgb, hsl, hwb, lab, lch and oklch.

Add/subtract business days to a date, or count business days between two dates — skipping weekends and optional holida

Convert an ISO datetime into another timezone, with offset, weekday and Unix time.

Check whether a specific date is a public holiday in a country (optionally by state/region).

List a country's holidays for a calendar year (optionally by state/region, language and type).

Parse, validate and format a phone number — E.164/national/international/RFC 3966, region and line type (syntactic val

Live GBLIN keeper bounty availability on Base: whether a profitable incentivizedRebalance exists right now, expected E

Skim: clean reader — URL to agent-ready markdown + metadata, ~4x smaller than raw HTML

GBLIN treasury analytics on Base: total supply, NAV, basket dynamic weights (cbBTC/WETH/USDC), stability fund and keep

Validate a ULID and extract its embedded timestamp and time/random components.

Generate one or more lexicographically sortable ULIDs (monotonic within a call).

Validate a UUID and report its version and variant.

Generate one or more UUIDs. Supports v4 (random), v1/v7 (time), and v3/v5 (namespaced).

Embeds one request and a provided tool list locally, then returns deterministic similarity ranks and the selected tool

Calculates item co-occurrence and item similarity from the submitted events only. No user profile is stored.

Validate and normalize phone numbers (Google libphonenumber): validity, E.164/international/national formats, country,

Validate up to 100 IBANs in one call at $0.002 per IBAN (2.5x cheaper per IBAN than single calls at $0.005, and one se

Harvests the curated feed set for one topic and language, groups the headlines into events and returns one entry per e

Harvests the curated feed set for one topic and language, groups the headlines into events and returns one entry per e

Converts a timestamp between IANA timezones.

Cryptocurrencies trending on CoinGecko right now — the coins agents and humans are searching for most. Returns id, sym

Crypto market sentiment: the Fear & Greed Index (0=extreme fear, 100=extreme greed) with classification, plus optional

Check accrued tollbooth earnings for a payout wallet: credits owed and USD equivalent. Earnings accrue from /toll/fetc

Render an http(s) URL to a PDF (A4/A3/Letter/Legal/Tabloid) with print emulation; returns a JSON envelope with the PDF