the402 x402 endpoint directory

A Farcaster user's recent casts by fid or username, newest first, optionally including replies or limited to one chann

Recent crypto headlines aggregated from the public feeds of major outlets, deduplicated and newest first, each with ti

Trending Farcaster channels ranked by casting activity over 1d, 7d or 30d, with cast counts for all three windows, fol

The options chain for a currency and expiry sorted by strike: bid, ask, mark, mark implied volatility, open interest,

Latest casts in one or more Farcaster channels (e.g. base, farcaster, ethereum), newest first, with optional replies.

Historical USD price series for a token, by ticker symbol (ETH, BTC, SOL, ...) or by ERC-20 contract + network, at 5-m

The whole crypto perp market in one call: advancers versus decliners, mean, median and volume-weighted 24h change, tot

AI-powered text translation between any languages. Powered by Claude AI. Send text and target language, receive a high

Upcoming fixtures and the game schedule for a major sports league, normalized to one cited JSON. Give a league such as

Get weather forecast (TAF) for a specific airport

Convert USD to CNY at live rate. Pass ?amount=100 for value in Chinese Yuan. 美元兑换人民币换算。米ドルを人民元に換算。Convertir dólar a yu

Viewport or full page, optional element selector, dark mode and cookie banner removal. Returns base64 image plus a sho

Viewport or full page, optional element selector, dark mode and cookie banner removal. Returns base64 image plus a sho

Bundled execution of the Timezone planner workflow - Time zone conversion, business day calculation, and cron schedule

Decode a 17-char VIN via NHTSA vPIC for $0.004 USDC with make/model/year and attribution. Call when you need this boun

Validate an IMO ship identification number check digit.

SSRF-safe public GET with status, headers, and size-capped JSON/text body for agent tool use

Resolve multiple DNS record types (A, AAAA, MX, TXT, NS, CNAME) in one call via DoH for deliverability and security ag

TLS peer certificate subject, issuer, expiry, and authorization status for a public host

Extract printed and handwritten text from a supplied image using OCR.

Relative strength index (RSI) for an asset slug.

Historical performance by day of week (avg return + win rate per weekday) over the lookback. Use to time entries/exits

Historical performance by calendar month (e.g. 'Uptober') — avg return and win rate per month. Use for seasonal positi

Historical volatility by hour of day (UTC) plus a session comparison — which hours move most. Use to time entries to a

Fetch a URL and return context already fitted to your token budget, with token counts and an omission manifest.

single-fact naics lookup. Complete for the bundled 2022 vintage: all 2129 NAICS 2022 codes at levels 2 through 6, titl

single-fact naics lookup. Complete for the bundled 2022 vintage: all 2129 NAICS 2022 codes at levels 2 through 6, titl

AiScale Data Extractor: Extracts structured data from a URL or raw HTML. Returns entities, facts, tables, and metadata

Solve the linear system A·x = b for a square coefficient matrix A and vector b via Gaussian elimination with partial p

Invert a square matrix via Gauss-Jordan elimination. A non-square, ragged or empty matrix is a clean 400. A singular (

Compute the determinant of a square matrix via Gaussian elimination with partial pivoting. A non-square, ragged or emp

Transpose a matrix, swapping rows and columns. A ragged/empty matrix is a clean 400.

Get weather forecast (TAF) for a specific airport

Simple moving average (SMA) for an asset slug.

Multiply two matrices A·B. The inner dimensions must agree (columns of A equal rows of B); a mismatch or a ragged/empt

Parse a DKIM public-key DNS TXT record ("v=DKIM1; k=rsa; p=…") into its key type, public key, hash algorithms, service

Parse a DMARC TXT record ("v=DMARC1; p=…") into its policy, alignment, sampling and reporting tags. Missing or invalid

Evaluate an SPF record against an IPv4/IPv6 address using only its literal ip4/ip6/all mechanisms. DNS-dependent mecha

Parse an SPF TXT record ("v=spf1 …") into its qualified mechanisms and modifiers. Records that do not start with v=spf

Given a reaction and the supplied amount of every reactant, identify the limiting reagent and compute leftover reactan

Given a reaction and a known amount (moles or grams) of one species, compute the amount of a target species. The equat

Balance an equation such as "H2 + O2 -> H2O" into the smallest whole-number coefficients using exact rational linear a

Determine the astronomical season for a date, based on the Sun's apparent ecliptic longitude (0°=March equinox, 90°=Ju

Compute the Moon's phase name, age in days since the last new moon and illuminated fraction (0..1) for a UTC date/time

Compute sunrise, sunset, solar noon and day length for a latitude/longitude (east-positive) and date, using the NOAA s

Compute the astronomical Julian Date (JD, fractional, epoch noon 1 Jan 4713 BC) and Modified Julian Date (MJD = JD − 2

Normalise an address to its canonical form — Ethereum to its EIP-55 checksummed form, bech32 Bitcoin to lowercase (bas

Apply the EIP-55 mixed-case checksum to an Ethereum address, regardless of its input casing. Returns the checksummed a

Guess which chain an address belongs to from its shape and encoding, without requiring the caller to know it up front.

Validate a blockchain address. Supply `chain` to check against a specific chain, or omit it to auto-detect. Ethereum a