33 Services from api.duoleads.com

Validates an IBAN's structure, length, character classes, and mod-97-10 check digit, and returns the decomposed bank code, branch code, account number, plus electronic and print formats for 89 SWIFT-registered countries.

Identifies which blockchain network(s) a given crypto address belongs to, validates encoding correctness (checksum, format), and returns the checksummed form with detailed failure reasons.

Validates GS1 identifiers (GTIN-8/12/13/14, GLN, SSCC), verifies check digits, computes missing check digits, and converts between GTIN formats

Constructs a valid IBAN from a country code and domestic account parts (BBAN or named bank/branch/account fields), computing ISO 7064 mod-97-10 check digits and returning both electronic and print formats.

Validates a national identity, tax, or company registration number against its country's official checksum algorithm — structure and check-digit only, no registry lookup or personal data stored.

Splits a monetary amount into N equal parts or by custom ratios, distributing any remainder cent-by-cent using a deterministic rule so parts always sum exactly to the original.

Compare two strings and return a comprehensive suite of similarity metrics including edit distances, phonetic keys, and token-based scores in a single call.

Converts arbitrary text into a URL-safe slug with locale-aware transliteration, accent decomposition, separator options, length truncation, and stop-word removal.

Analyses a string at the Unicode level: applies NFC/NFD/NFKC/NFKD normalisation, reports which forms the string is already in, lists scripts present, and flags confusable, homoglyph, invisible, and bidirectional-override characters with per-character detail.

Add or subtract N working days from a date, or count working days between two dates, using a caller-supplied weekend mask and holiday list.

Converts an instant to wall-clock time in a named IANA time zone, or a local wall-clock time back to an instant, with full DST boundary handling and rich calendar metadata.

Converts internationalised domain names between Unicode and ASCII punycode, validates each label against IDNA2008 rules, and returns both forms with a per-label breakdown and the first rule violated.

Computes geodesic distance (Vincenty/haversine), initial and final bearing, midpoint, and destination point between WGS-84 coordinates, plus cumulative path length, in metres, km, nautical miles, and miles.

Validates the check digit of ISIN, CUSIP, SEDOL, and FIGI identifiers, returning validity verdict and computed check character; also builds an ISIN from a country code and NSIN.

Converts a number into its written-word form in 12 languages, supporting cardinal, ordinal, currency, and year formats with proper grammatical agreement

Look up an airport by IATA or ICAO code, or find the nearest airports to a lat/lon coordinate within a configurable radius, returning name, location, region, elevation, and matched code type.

Expands an RFC 5545 recurrence rule (RRULE) into up to 200 concrete occurrence timestamps, returning both local wall-clock times and UTC instants with DST-shift annotations.

Look up a country or territory by ISO 3166-1 code or name and return all codes, the English name, UN M49 region/sub-region, currencies, and ccTLD.

Look up an ISO 4217 currency by alpha or numeric code to retrieve its name, minor unit exponent, cash rounding increment, and the territories that use it.

Decodes a JWT without signature verification, returning header, claims, payload, signature info, and computed time-claim analysis (expiry, not-before, remaining lifetime).

Parse a semantic version string into its components, compare two versions by precedence, test whether a version satisfies a range expression, or sort a list of versions.

Parses and canonicalises a URL, extracting scheme, host, port, path, query parameters, fragment, public suffix, registrable domain (eTLD+1), and subdomain using the Public Suffix List.

Encodes WGS-84 lat/lon to a geohash string (with neighbours) or decodes a geohash to its bounding box, centre point, and error bounds in metres

Encodes WGS-84 coordinates to an Open Location Code (plus code), decodes a plus code to its bounding box and centre, shortens a full code against a reference coordinate, or recovers a shortened code given a reference.

Computes geometric predicates on a GeoJSON Polygon or MultiPolygon: point-in-polygon containment, bounding box, centroid, geodesic area (m²), perimeter length, and ring winding order.

Converts a Gregorian date to Islamic, Hebrew, Japanese imperial era, Republic of China, Buddhist, and/or Persian calendar systems, or computes Easter Sunday (Gregorian or Julian reckoning) for a given year.

Computes the Keccak-256 hash of a Solidity function, event, or error signature to derive the 4-byte function selector and 32-byte event topic, with automatic signature normalisation; also hashes arbitrary text or hex bytes.

Lists daylight-saving time transitions for an IANA time zone over a date range, returning the exact shift instants, UTC offsets before/after, direction, and current DST state.

Look up, search, and traverse European NUTS statistical regions by code or name, returning names, hierarchy, and typologies from the NUTS 2024 classification.

Transliterates Cyrillic text into Latin script using ISO 9:1995 or BGN/PCGN Russian romanisation standards, returning the result along with coverage and script metadata.

Converts an integer from any numeric base (2–36) to any other base with arbitrary precision, returning the result, decimal value, bit length, and digit count.

Computes comprehensive descriptive statistics (count, mean, median, mode, variance, stdev, quartiles, skewness, kurtosis, percentiles, and more) for a supplied numeric array in a single call.

Computes a cryptographic digest (SHA-256, SHA-384, SHA-512, SHA-1, SHA3-256, SHA3-512, Keccak-256, BLAKE2b-256, BLAKE2b-512) or HMAC of supplied data, returning the digest in a chosen output encoding.