the402 x402 endpoint directory

Curated on-chain registry lookup for Robinhood Chain stock tokens: 20 equities and 5 ETFs with canonical contract addr

List every verified tokenized equity and ETF contract live on Robinhood Chain — symbol, contract address, and oracle p

Breaks down any text into character, word, and sentence counts, estimated LLM token count, and reading time, computed

Computes a Flesch reading-ease score, average sentence length, and estimated reading time for any block of text, along

Token and word counting API: characters, words, sentences, estimated LLM tokens, Flesch reading ease, and reading time

Percentage difference and percent-change calculator comparing two numeric values, plus straightforward percent-of and

Calculate a percent increase or decrease applied to a number, or the percent change between an old and new value, with

Percentage math calculator: find what X% of Y is, what percent one number is of another, or the percent change between

Percentage API: X% of Y, X is what percent of Y, percent change, percent increase/decrease — all five, exact, one call

Math fact generator for integers: computes a bundle of properties for any number you supply, primality, factorization,

Number trivia API: the mathematical personality of any integer — prime status, prime factorization, Fibonacci membersh

Generates a deterministic checksum, SHA-256, SHA-512, SHA-1, or MD5, for any block of text, returned as a hex digest w

Produces an MD5 hash, or SHA-1, SHA-256, SHA-512 on request, of any text input as a hex digest, computed instantly wit

Computes a SHA-256 digest of any input text and returns it as a hex string, computed locally with no network round-tri

Generates unambiguous alphanumeric secrets, hex strings, and UUIDs from OS-grade entropy in a single call, with length

Produces random hex strings or alphanumeric secrets, 8 to 128 characters, from OS-grade entropy, alongside batch UUID

Generates cryptographically random UUIDs in batches of up to 20 using OS-grade entropy, alongside hex tokens and unamb

UUID and secure token API: cryptographically random UUIDs (up to 20 per call), hex tokens, or unambiguous alphanumeric

Computes straight-line haversine distance and compass bearing between any two latitude/longitude points, returned in k

Calculates the great-circle distance between two GPS coordinates in kilometers, miles, and nautical miles, plus the in

Coordinate distance API: great-circle distance between two lat/lon points in km, miles, and nautical miles, plus initi

Counts calendar days or weekday-only business days between two dates, excluding weekends automatically. Built for SLA

Adds or subtracts a number of days from any date and returns the resulting calendar date plus its weekday, exact date

Business days calculator API: weekday count between two dates, or add N days to a date and learn what weekday lands. F

Reports the current moment in UTC and in any named timezone simultaneously, with unix epoch and day-of-week included,

Returns the exact current time in any IANA timezone, local ISO timestamp, UTC equivalent, unix epoch, human-readable s

World clock API: the current time in any IANA timezone — local ISO timestamp, UTC, unix epoch, and day of week — in on

Unit conversion tool covering length, weight, volume, area, speed, pressure, energy, and digital storage, with exact f

Converts between metric and imperial units — meters to feet, kilograms to pounds, liters to gallons, and 100+ other un

General-purpose measurement converter spanning length, mass, volume, area, speed, pressure, energy, power, and digital

Metric-imperial conversion API: miles↔km, lb↔kg, °F↔°C, gallons↔liters and 100+ more units, one call, exact factors. D

Unit converter API: length, mass, volume, temperature, area, speed, pressure, energy, power, and digital storage — 100

Converts a given local time between IANA timezones with daylight-saving transitions applied correctly, so a meeting sc

Takes a time in one timezone and returns the equivalent moment in another, handling daylight-saving transitions automa

Converts a specific wall-clock time from one IANA timezone to another, correctly applying daylight-saving rules for bo

Timezone conversion API: what is 3pm Tokyo time in Chicago? Convert wall-clock time between IANA zones with DST handle

Converts absolute Kelvin temperatures to and from Celsius, Fahrenheit, and Rankine with exact scientific precision. Fo

Temperature scale converter handling Fahrenheit, Celsius, Kelvin, and Rankine — give a value in any one scale and get

Converts a temperature value between Celsius, Fahrenheit, Kelvin, and Rankine in one call and returns all four scales

Temperature conversion API: any of Celsius, Fahrenheit, Kelvin, or Rankine to all four at once. Science-grade, exact.

Convert a number from one positional numbering system to another, including binary, octal, hex, and custom bases up to

Base conversion tool for translating whole numbers between binary, octal, decimal, hexadecimal, and any radix from 2 t

Number base conversion API: convert between any bases 2-36 — binary, octal, decimal, hex, and beyond. Exact, instant.

Contrast and dark-mode checker for any hex or rgb() input: returns whether a color reads as light or dark and which te

Color format converter for hex codes and rgb() values: get back hex, RGB, and HSL representations plus a light-or-dark

AI fortune cookie: a novelty endpoint that hands back a fresh aphorism written with AI agents in mind, plus a lucky nu

Random fortune generator: returns a freshly written one-line fortune every call, paired with a lucky number and a luck

Fortune cookie API for AI agents: a fortune written for language models, a lucky number, and a lucky HTTP status — the

UK DVLA vehicle details by registration plate.

JSON repair for AI agents - fix malformed JSON and return structured output.