Duo Data Utilities
Spell a number out in words in English, Dutch, German, French, Spanish, Italian, Portuguese, Polish, Russian, Turkish, Swedish or Japanese, in cardinal, ordinal or currency form. Currency form agrees the number with the currency noun and gives real minor-unit names for 19 currencies (EUR, USD,…
| Host | api.duoleads.com |
|---|---|
| Price | $0.05 per call |
| Network | Base |
| Paid endpoints listed | 33 |
| Calls, last 30 days* | 92 |
| Most unique payers on one endpoint (30 days)* | 3 |
| Last paid call* | 2026-10-11 |
| Tags | no-api-key, deterministic, id, identifiers, code, time, num, geo |
* From the public x402 Bazaar index (snapshot 2026-10-18T04:07Z); reported by the facilitator, not measured by us.
Endpoints
| URL | Method | Price |
|---|---|---|
https://api.duoleads.com/v1/num/wordsSpell a number out in words in English, Dutch, German, French, Spanish, Italian, Portuguese, Polish, Russian, Turkish,… | GET | $0.05 |
https://api.duoleads.com/v1/id/ibanIBAN validator: validate an IBAN's length for its country, permitted character classes per field, and the ISO 7064… | GET | $0.05 |
https://api.duoleads.com/v1/geo/geohashEncode a WGS-84 latitude and longitude to a geohash at a chosen precision, or decode a geohash back to its bounding… | GET | $0.05 |
https://api.duoleads.com/v1/id/nationalVAT, tax ID and national ID validator: check a national identity, tax or company registration number against its… | GET | $0.05 |
https://api.duoleads.com/v1/chain/addressIdentify which blockchain an address belongs to and validate its encoding: EVM EIP-55 checksum, Bitcoin base58check… | GET | $0.05 |
https://api.duoleads.com/v1/id/gs1Validate and convert GS1 identifiers: GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), GTIN-14, GLN and SSCC. Returns the… | GET | $0.05 |
https://api.duoleads.com/v1/code/idnConvert internationalised domain names between Unicode and ASCII punycode in either direction, label by label, and… | GET | $0.05 |
https://api.duoleads.com/v1/text/transliterateTransliterate Cyrillic text into Latin using a named standard: ISO 9:1995 (one-to-one, with diacritics, covering the… | GET | $0.05 |
https://api.duoleads.com/v1/num/allocateSplit a money amount into shares without losing or inventing a cent. Divide evenly into N parts, or by a list of… | GET | $0.05 |
https://api.duoleads.com/v1/num/statsDescriptive statistics for a supplied numeric array in one call: count, sum, mean, median, mode, variance and standard… | GET | $0.05 |
https://api.duoleads.com/v1/num/radixConvert an integer between any two numeric bases from 2 to 36, with arbitrary precision so values far beyond 2^53 are… | GET | $0.05 |
https://api.duoleads.com/v1/ref/countryLook up a country or territory by ISO 3166-1 alpha-2, alpha-3 or numeric code, or by name, and get the other codes,… | GET | $0.05 |
https://api.duoleads.com/v1/ref/currencyLook up a currency by its ISO 4217 alphabetic or numeric code: the official English name, minor-unit exponent, fund… | GET | $0.05 |
https://api.duoleads.com/v1/ref/airportLook up an airport by IATA or ICAO code and get its name, city, country, ISO 3166-2 region code, WGS-84 coordinates,… | GET | $0.05 |
https://api.duoleads.com/v1/ref/nutsLook up a NUTS statistical region of the European Union: resolve a NUTS code to its name, country and level, walk up… | GET | $0.05 |
https://api.duoleads.com/v1/chain/selectorCompute the Keccak-256 hash of a Solidity function or event signature and derive the 4-byte function selector and the… | GET | $0.05 |
https://api.duoleads.com/v1/geo/distanceDistance and direction between WGS-84 coordinates: geodesic distance by Vincenty with a haversine fallback, initial… | GET | $0.05 |
https://api.duoleads.com/v1/geo/polygonGeometric predicates on a GeoJSON geometry supplied in the request: point-in-polygon with correct hole handling,… | GET | $0.05 |
https://api.duoleads.com/v1/geo/pluscodeEncode coordinates as an Open Location Code (plus code) at a chosen length, or decode a full code back to its bounding… | GET | $0.05 |
https://api.duoleads.com/v1/code/jwtDecode a JSON Web Token without verifying it: returns the header, the claims, the signature length and algorithm, and… | GET | $0.05 |
https://api.duoleads.com/v1/code/hashCompute a cryptographic digest of supplied data: SHA-256, SHA-384, SHA-512, SHA-1, SHA3-256, SHA3-512, Keccak-256,… | GET | $0.05 |
https://api.duoleads.com/v1/code/semverParse a semantic version into major, minor, patch, prerelease and build parts; compare two versions by precedence… | GET | $0.05 |
https://api.duoleads.com/v1/code/urlParse and canonicalise a URL, and extract its registrable domain using the Public Suffix List — the part an agent… | GET | $0.05 |
https://api.duoleads.com/v1/text/similarityCompare two strings and return every standard similarity measure in one call: Levenshtein and Damerau-Levenshtein edit… | GET | $0.05 |
https://api.duoleads.com/v1/text/unicodeAnalyse a string at the Unicode level: apply NFC, NFD, NFKC or NFKD, report which forms it is already in, list the… | GET | $0.05 |
Source: x402 Bazaar discovery API (Coinbase CDP) · Licence: Public discovery metadata; descriptions by each provider. Listed in x402 pay-per-call APIs. We list tools; we do not test, rate or endorse them.
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