# Services from api.duoleads.com on Zero

> api.duoleads.com serves 33 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/api.duoleads.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.duoleads.com/health.json

## Services

- [Duo Data Utilities – IBAN Validator](https://www.zero.xyz/c/duo-data-utilities-iban-validator-70c6bd0c/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Financial Security Identifier Validator & ISIN Builder](https://www.zero.xyz/c/duo-data-utilities-financial-security-identifier-validator-isin-builder-36870be4/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Airport Lookup](https://www.zero.xyz/c/duo-data-utilities-airport-lookup-8ac8235e/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – GS1 Identifier Validation & Conversion](https://www.zero.xyz/c/duo-data-utilities-gs1-identifier-validation-conversion-b123ed3e/llms.txt): $0.05/call via x402. Validates GS1 identifiers (GTIN-8/12/13/14, GLN, SSCC), verifies check digits, computes missing check digits, and converts between GTIN formats
- [Duo Data Utilities – Text Similarity](https://www.zero.xyz/c/duo-data-utilities-text-similarity-610ea613/llms.txt): $0.05/call via x402. Compare two strings and return a comprehensive suite of similarity metrics including edit distances, phonetic keys, and token-based scores in a single call.
- [Duo Data Utilities – Text Slugifier](https://www.zero.xyz/c/duo-data-utilities-text-slugifier-dacbd631/llms.txt): $0.05/call via x402. Converts arbitrary text into a URL-safe slug with locale-aware transliteration, accent decomposition, separator options, length truncation, and stop-word removal.
- [Duo Data Utilities – Business Day Arithmetic](https://www.zero.xyz/c/duo-data-utilities-business-day-arithmetic-1d751f1f/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Unicode Analysis](https://www.zero.xyz/c/duo-data-utilities-unicode-analysis-3a39265b/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – IBAN Builder](https://www.zero.xyz/c/duo-data-utilities-iban-builder-7b243143/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – RFC 5545 RRULE Expander](https://www.zero.xyz/c/duo-data-utilities-rfc-5545-rrule-expander-357e44f5/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Money Allocation / Split](https://www.zero.xyz/c/duo-data-utilities-money-allocation-split-77649818/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Time Zone Conversion](https://www.zero.xyz/c/duo-data-utilities-time-zone-conversion-d9e2a5dd/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – IDN Converter & IDNA2008 Validator](https://www.zero.xyz/c/duo-data-utilities-idn-converter-idna2008-validator-71f568af/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Blockchain Address Chain Identification & Validation](https://www.zero.xyz/c/duo-data-utilities-blockchain-address-chain-identification-validation-8d1bcf5f/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Number to Words](https://www.zero.xyz/c/duo-data-utilities-number-to-words-5a680ea4/llms.txt): $0.05/call via x402. Converts a number into its written-word form in 12 languages, supporting cardinal, ordinal, currency, and year formats with proper grammatical agreement
- [Duo Data Utilities – National ID / Tax / Company Number Validator](https://www.zero.xyz/c/duo-data-utilities-national-id-tax-company-number-validator-5987daac/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Geodesic Distance & Navigation](https://www.zero.xyz/c/duo-data-utilities-geodesic-distance-navigation-1be1b1c0/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – NUTS Region Lookup](https://www.zero.xyz/c/duo-data-utilities-nuts-region-lookup-0c40ce5f/llms.txt): $0.05/call via x402. Look up, search, and traverse European NUTS statistical regions by code or name, returning names, hierarchy, and typologies from the NUTS 2024 classification.
- [Duo Data Utilities – Semantic Version Parser & Comparator](https://www.zero.xyz/c/duo-data-utilities-semantic-version-parser-comparator-ba21dd74/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – URL Parser & Registrable Domain Extractor](https://www.zero.xyz/c/duo-data-utilities-url-parser-registrable-domain-extractor-8c90b1a5/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Geohash Encode/Decode](https://www.zero.xyz/c/duo-data-utilities-geohash-encode-decode-7197e4f7/llms.txt): $0.05/call via x402. 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
- [Duo Data Utilities – Plus Code (Open Location Code) Encode/Decode/Shorten/Recover](https://www.zero.xyz/c/duo-data-utilities-plus-code-open-location-code-encode-decode-shorten-9c696f22/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Descriptive Statistics](https://www.zero.xyz/c/duo-data-utilities-descriptive-statistics-64f18492/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Calendar Conversion & Easter Calculator](https://www.zero.xyz/c/duo-data-utilities-calendar-conversion-easter-calculator-1071a478/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Country Lookup](https://www.zero.xyz/c/duo-data-utilities-country-lookup-1f9beb27/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – ISO 4217 Currency Lookup](https://www.zero.xyz/c/duo-data-utilities-iso-4217-currency-lookup-020ccd57/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Cyrillic Transliteration](https://www.zero.xyz/c/duo-data-utilities-cyrillic-transliteration-ecb59bd6/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – DST Transitions](https://www.zero.xyz/c/duo-data-utilities-dst-transitions-d0a25e5a/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Solidity Keccak-256 Selector & Topic Derivation](https://www.zero.xyz/c/duo-data-utilities-solidity-keccak-256-selector-topic-derivation-a1dba4ff/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – GeoJSON Polygon Geometry](https://www.zero.xyz/c/duo-data-utilities-geojson-polygon-geometry-7d8793c8/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – Radix/Base Converter](https://www.zero.xyz/c/duo-data-utilities-radix-base-converter-453c73bd/llms.txt): $0.05/call via x402. 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.
- [Duo Data Utilities – JWT Decoder](https://www.zero.xyz/c/duo-data-utilities-jwt-decoder-0a5806b9/llms.txt): $0.05/call via x402. Decodes a JWT without signature verification, returning header, claims, payload, signature info, and computed time-claim analysis (expiry, not-before, remaining lifetime).
- [Duo Data Utilities – Cryptographic Hash & HMAC](https://www.zero.xyz/c/duo-data-utilities-cryptographic-hash-hmac-c7662618/llms.txt): $0.05/call via x402. 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.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

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