the402 x402 endpoint directory

Link destination checker: reveals where a shortened or forwarding URL actually leads before you click it, returning th

URL unshortener API: follow any short link safely and get the final destination, full redirect chain, and final status

URL expansion API: safely follow a short or redirecting link (up to 6 hops, SSRF-guarded) and return the final URL, co

A normalized feed of the top-ranked technology and developer stories right now — title, link, score, author, and comme

The current top 30 tech stories ranked by community interest, each with title, outbound article link, point score, aut

Tech news front page API: the current top 30 ranked tech stories — title, outbound URL, points, comment count, and tim

Tech news pulse API: the current 30 top-ranked tech stories from the leading hacker community front page — title, outb

HTTPS certificate inspector: retrieves the full TLS certificate detail for any domain, including the subject-alternati

Certificate expiration checker: point it at any domain and get back its certificate's issuer, subject, valid-from and

TLS certificate expiry API: days until any domain's certificate expires, plus issuer, subject, SANs, and validity stat

Looks up normalized package metadata from the Python Package Index, version, dependencies, license, homepage, and yank

Returns the latest version, summary, license, and required Python version constraint for any package on the Python Pac

PyPI package inspection API: latest version, summary, license, requires-python, dependency declarations, and yank stat

PyPI package info API: latest version, one-line summary, license, requires-python constraint, declared dependencies, y

Query the official public holidays for a given country and year, returned with local and English names, nationwide-vs-

Full public holiday calendar for any of 110+ countries and any year — date, local-language name, English name, whether

Public holidays API: every official holiday for any country and year — date, local name, English name, and which subdi

Public holidays API: the official public holidays for any country (110+ supported) and year — date, local name, Englis

Parses loosely formatted phone number input and returns its E.164 standard representation, country, and line type, wit

Formats any phone number into its E.164 canonical form plus national and international display formats, detecting the

Phone number parsing API: validate any phone number and get its country, E.164 canonical form, national and internatio

Returns normalized metadata for any npm package, current version, license, dependency list, and whether it's been depr

Looks up the latest published version of any npm package along with its license, declared dependencies, publish date,

npm package inspection API: latest version, publish date, license, deprecation status, dependency count, and maintaine

npm package info API: the latest published version of any npm package with its publish metadata, license, declared dep

Mole-to-mass-to-molecule-count converter for any chemical formula: supply a mass in grams or an amount in moles and ge

Converts between grams, moles, and molecule count for any chemical formula using its molar mass and Avogadro's number

Mole conversion API: convert grams↔moles↔molecules for any chemical formula, using its computed molar mass and Avogadr

Mole conversion API: for any chemical formula, convert between grams, moles, and number of molecules using the formula

Molecular weight calculator for chemical formulas: parses parentheses and hydrate notation to return total molar mass,

Computes the exact molar mass in g/mol for any chemical formula, including nested parentheses like Ca(OH)2 and hydrate

Molar mass API: the molecular weight of any chemical formula (H2O, C6H12O6, Ca(OH)2, CuSO4·5H2O) in g/mol, with a per-

Molar mass API: compute the molecular weight of any chemical formula in g/mol — handles nested parentheses (Ca(OH)2, F

Resolve a place name to its geographic coordinates, along with country, region, population, elevation, and local timez

Turn a city, town, or place name into latitude/longitude, country, admin region, population, elevation, and timezone f

Geocoding API: city or place name to latitude/longitude with country, region, population, and timezone — top matches r

City geocoding API: convert any city or place name to latitude/longitude, with country, admin region, population, elev

Generates a ready-to-embed QR code image, base64 PNG, from any text or URL input up to 2000 characters, with configura

On-demand QR code creation from plain text or a URL, configurable size from 128 to 1024 pixels with medium error corre

Turn any link or short block of text, up to 2000 characters, into a scannable QR code PNG, delivered as base64 with ad

QR code generator API: turn any text or URL (up to 2000 characters) into a scannable PNG QR code, returned as base64 —

Fetch the official daily benchmark rate between two of about 30 major world currencies, complete with the date the rat

Look up the daily reference rate for any pair among roughly 30 major currencies, returned with the date it applies to.

Currency exchange rate API: official daily reference rate for any major fiat pair (USD, EUR, GBP, JPY, ~30 ISO currenc

Validate an email address's syntax and confirm its domain has live mail servers configured (MX records, falling back t

Checks whether an email address is well-formed and whether its domain actually has working mail servers, returning the

Email domain verification API: syntax check plus live mail-server (MX) lookup for any address, returning sorted mail h

Resolve the nameservers, mail servers, or any other DNS record type for a hostname, with DNSSEC status included in the

Check any hostname's DNS records — A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV, or PTR — along with whether DNSSEC vali

Query mail server (MX), address (A/AAAA), text (TXT), or any other DNS record type for a hostname, with DNSSEC validat