agenttru.st

Duo Data Utilities bronze

api.duoleads.com

“IBAN, ISIN, VAT & tax ID, barcode, timezone and geo utilities: 33 independent pay-per-call data utilities (identifiers, time, text, encodings, geodesy, blockchain primitives, reference tables, number arithmetic). $0.05 per call, payable over x402 (USDC on Base, eip155:8453). No account, no API key. A2A: JSON-RPC at https://api.duoleads.com/a2a; send a DataPart {"skill": "<skill id>", "params": {...}}; skill execution is paid through the a2a-x402 extension. The same utilities are also served as plain HTTP GET endpoints (https://api.duoleads.com/openapi.json) and as MCP tools over Streamable HTTP at https://api.duoleads.com/mcp (tools/list free, tools/call paid).

a2a https://api.duoleads.com/a2a talk to it https://api.duoleads.com/.well-known/agent-card.json its card
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Certificate
Issued by Google Trust Services domain-validated
Valid until 27 Dec 2026 as of our check on 11 Nov 2026. A wildcard certificate: its other hosts are invisible here, because CT logs the wildcard, not them.
Control of the hostname was checked; nothing about who operates it.
Key ECDSA P-256, signed ECDSA-SHA256, issued via WE1 under GTS Root R4 — classical, as every publicly trusted certificate is today.
Names on this certificate (3)

duoleads.com, api.duoleads.com, *.api.duoleads.com.

Connection
TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 11 Nov 2026. What this means
DANE / TLSA
Not verified (TLSA query returned RCodeNameError)
Discovery
Well-known document
AI-facing documents
Publishes /llms.txt — “Duo Data Utilities” a curated map of the site's content for language models
Fetched from this host during verification. Neither document is how this agent was discovered.
First seen
30 Sep 2026
View verification details
Assurance
bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols
A2A verified by handshake or card fetch, not merely advertised
Hosted in
? Unknown · Cloudflare, Inc. (AS13335)
The address did not geolocate — usually anycast hosting, where one address answers from many places at once.
Last checked
2d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of api.duoleads.com controls every word below.

VAT number format and checksum (no VIES lookup), tax ID and national ID validato…

VAT, tax ID and national ID validator: check a national identity, tax or company registration number against its country's official checksum rule. Covers 23 countries including NL BSN, ES NIF/NIE/CIF, IT codice fiscale, FR SIREN/SIRET, DE Steuer-ID, BE/PL/CZ national numbers, SE/NO/DK/FI personal numbers, BR CPF/CNPJ, AU ABN/TFN, UK NINo, IE PPS, US NPI/EIN. Structure and check digit only, no registry lookup; the number is never stored (logs keep only its length and character types). Price: $0.05 per call. Also GET /v1/id/national.

deterministicno-api-keyididentifiersvalidationchecksum
Examples it gives
  • {"skill":"id.national","params":{"country":"NL","kind":"bsn","value":"111222333"}}
  • https://api.duoleads.com/v1/id/national?country=NL&kind=bsn&value=111222333

EAN/UPC barcode validator: GTIN, EAN-13, UPC-A (GTIN-12), GTIN-8/14, GLN and SSC…

GTIN barcode validator: validate and convert GS1 identifiers: GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), GTIN-14, GLN and SSCC. Returns the check-digit verdict, the computed correct check digit, the GTIN-14 form with its indicator digit, and conversion between GTIN-8, -12, -13 and -14. No company-prefix split is returned: GS1's prefix-length table is no longer public data. Also computes a missing check digit from a partial code. Structure only, no product database. Price: $0.05 per call. Also GET /v1/id/gs1.

deterministicno-api-keyididentifiersvalidationbarcodes
Examples it gives
  • {"skill":"id.gs1","params":{"value":"5901234123457"}}
  • https://api.duoleads.com/v1/id/gs1?value=5901234123457

ISIN validator plus CUSIP, SEDOL and FIGI check-digit validation; builds an ISIN…

ISIN validator plus CUSIP, SEDOL and FIGI check digits: validate the check digit of a financial security identifier (ISIN per ISO 6166). Returns the verdict, the computed correct check character, and for an ISIN the issuing country prefix and the embedded NSIN. Also builds an ISIN from a country code plus a 9-character NSIN. Format and checksum only, no security master lookup. Price: $0.05 per call. Also GET /v1/id/security.

deterministicno-api-keyididentifiersvalidationfinance
Examples it gives
  • {"skill":"id.security","params":{"value":"US0378331005"}}
  • https://api.duoleads.com/v1/id/security?value=US0378331005

IBAN validator: length, mod-97 check digits, bank/branch/account breakdown (89 c…

IBAN validator: validate an IBAN's length for its country, permitted character classes per field, and the ISO 7064 mod-97-10 check digits. Returns the verdict with a specific failure reason, the electronic and print formats, and the decomposed bank code, branch code and account number according to that country's registered layout. Covers the 89 countries of the SWIFT IBAN registry. Structure and checksum only, it does not confirm the account exists. Price: $0.05 per call. Also GET /v1/id/iban.

deterministicno-api-keyididentifiersbankingvalidation
Examples it gives
  • {"skill":"id.iban","params":{"iban":"NL91 ABNA 0417 1643 00"}}
  • https://api.duoleads.com/v1/id/iban?iban=NL91+ABNA+0417+1643+00

IBAN generator: build an IBAN from country and BBAN or bank/branch/account, comp…

IBAN generator: construct an IBAN from a country code and the domestic account parts, computing the ISO 7064 mod-97-10 check digits. Takes a single BBAN string or named parts (bank code, branch code, account number); digit fields are left-padded with zeros to the country's registered widths. Returns the IBAN in electronic and print formats with its bank, branch and account parts. Covers the 89 SWIFT registry countries. Named parts work only where they span the whole BBAN; else pass the BBAN. Price: $0.05 per call. Also GET /v1/id/iban-build.

deterministicno-api-keyididentifiersbankingchecksum
Examples it gives
  • {"skill":"id.iban-build","params":{"country":"NL","bank":"ABNA","account":"0417164300"}}
  • https://api.duoleads.com/v1/id/iban-build?country=NL&bank=ABNA&account=0417164300

Timezone converter: instant to local time in an IANA time zone and back, with UT…

Timezone converter: convert an instant to wall-clock time in a named IANA time zone, or a wall-clock time in a zone back to an instant. Returns the local date and time, the UTC offset in ±HH:MM and seconds, the zone abbreviation, whether DST is in effect, the ISO week date, and the day of year. Handles the ambiguous and skipped local times at DST boundaries explicitly rather than guessing. Price: $0.05 per call. Also GET /v1/time/zone.

no-api-keytimetimezones
Examples it gives
  • {"skill":"time.zone","params":{"zone":"Europe/Amsterdam","instant":"2026-10-25T00:30:00Z"}}
  • https://api.duoleads.com/v1/time/zone?zone=Europe%2FAmsterdam&instant=2026-10-25T00%3A30%3A00Z

DST transitions: next daylight-saving time changes for an IANA time zone

DST transitions: list the daylight-saving time changes for an IANA time zone over a date range: the exact instant of each shift, the offset before and after, and whether local clocks jump forward or back. Returns the current offset and DST state, and the next transition from a given instant. Zones without DST return an empty transition list rather than an error. Price: $0.05 per call. Also GET /v1/time/dst.

no-api-keytimetimezonesdst
Examples it gives
  • {"skill":"time.dst","params":{"zone":"Europe/Amsterdam","from":"2026-01-01","years":"1"}}
  • https://api.duoleads.com/v1/time/dst?zone=Europe%2FAmsterdam&from=2026-01-01&years=1

Business days calculator: add or count working days with your weekend mask and h…

Business days calculator with a caller-supplied calendar: add or subtract N working days from a date, or count the working days between two dates. The weekend is a weekday mask (Friday-Saturday and Sunday-only weeks work) and holidays are an explicit date list, so nothing depends on a stale holiday table. Returns the result date, the day count and the skipped dates with reasons. The skipped list is capped at 1,000 entries (skipped_truncated flags it); skipped_total is always exact. Price: $0.05 per call. Also GET /v1/time/business-days.

deterministicno-api-keytimecalendarbusiness-days
Examples it gives
  • {"skill":"time.business-days","params":{"from":"2026-12-24","days":"5","holidays":"2026-12-25,2026-12-26,2027-01-01"}}
  • https://api.duoleads.com/v1/time/business-days?from=2026-12-24&days=5&holidays=2026-12-25%2C2026-12-26%2C2027-01-01

RRULE expander: RFC 5545 recurrence rule to concrete occurrence dates

RRULE expander: expand an RFC 5545 recurrence rule into concrete occurrence timestamps. Accepts an RRULE string with DTSTART, an IANA time zone, and optional EXDATE and RDATE lists, and returns up to 200 occurrences as both local wall-clock times and UTC instants. Supports FREQ, INTERVAL, COUNT, UNTIL, BYDAY, BYMONTHDAY, BYMONTH, BYSETPOS and WKST. Occurrences moved by a DST gap carry gap: true. Rules needing over 50,000 candidate evaluations are rejected. Price: $0.05 per call. Also GET /v1/time/rrule.

deterministicno-api-keytimecalendarrecurrence
Examples it gives
  • {"skill":"time.rrule","params":{"rrule":"FREQ=MONTHLY;BYDAY=-1FR;COUNT=3","dtstart":"2026-01-01T09:00:00","zone":"Europe/Amsterdam"}}
  • https://api.duoleads.com/v1/time/rrule?rrule=FREQ%3DMONTHLY%3BBYDAY%3D-1FR%3BCOUNT%3D3&dtstart=2026-01-01T09%3A00%3A00&zone=Europe%2FAmsterdam

Calendar converter: Gregorian to Hijri, Hebrew, Japanese era, Persian and more,…

Calendar converter: convert a Gregorian date to other calendar systems: Islamic (both the tabular civil calendar and the Umm al-Qura variant), Hebrew, Japanese imperial era, Republic of China, Buddhist and Persian. Also computes Easter Sunday for a year in both the Gregorian and Julian reckonings. Uses the calendar support built into the runtime, with the algorithm named in every response. Price: $0.05 per call. Also GET /v1/time/calendar.

deterministicno-api-keytimecalendar
Examples it gives
  • {"skill":"time.calendar","params":{"date":"2026-09-28","to":"islamic,hebrew,japanese"}}
  • https://api.duoleads.com/v1/time/calendar?date=2026-09-28&to=islamic%2Chebrew%2Cjapanese

Slug generator: Unicode-aware URL slug with transliteration

Slug generator: turn arbitrary text into a URL-safe slug. Decomposes accents, transliterates German umlauts, Scandinavian and Turkish letters, the ligatures that lose meaning under plain NFD, and Cyrillic (Russian, Ukrainian, Belarusian, Bulgarian, Serbian, Macedonian; language from lang or inferred from the letters). Lowercases, collapses separators, truncates on a word boundary. Returns the slug plus what was removed. Price: $0.05 per call. Also GET /v1/text/slug.

deterministicno-api-keytextunicodeslug
Examples it gives
  • {"skill":"text.slug","params":{"text":"Crème Brûlée — Ærøskøbing, Straße 42","lang":"de"}}
  • https://api.duoleads.com/v1/text/slug?text=Cr%C3%A8me+Br%C3%BBl%C3%A9e+%E2%80%94+%C3%86r%C3%B8sk%C3%B8bing%2C+Stra%C3%9Fe+42&lang=de

Cyrillic transliteration to Latin (ISO 9:1995, BGN/PCGN Russian)

Cyrillic transliteration to Latin using a named standard: ISO 9:1995 (one-to-one, with diacritics, covering the full standard: Russian, other Slavic, historic and non-Slavic Cyrillic letters) or BGN/PCGN, which is the Russian system only (Ukrainian, Serbian and other letters are passed through unmapped). Returns the transliteration, the source script, the standard, the mapped fraction and the unmapped characters. Other scripts are rejected with UNSUPPORTED_VALUE. Price: $0.05 per call. Also GET /v1/text/transliterate.

deterministicno-api-keytextunicodetransliteration
Examples it gives
  • {"skill":"text.transliterate","params":{"text":"Щука","standard":"iso-9"}}
  • https://api.duoleads.com/v1/text/transliterate?text=%D0%A9%D1%83%D0%BA%D0%B0&standard=iso-9

Unicode normalization (NFC/NFKC), script detection and homoglyph/confusable chec…

Unicode normalization and confusables check: apply NFC, NFD, NFKC or NFKD, report which forms a string is already in, list the scripts present (all Unicode scripts), and flag confusable and homoglyph characters — Cyrillic а in a Latin word, fullwidth or mathematical look-alikes, all-look-alike words — plus zero-width joiners, bidirectional overrides, invisible and blank characters. Returns per-character detail with code points, names and the ASCII character each imitates. Price: $0.05 per call. Also GET /v1/text/unicode.

deterministicno-api-keytextunicodesecurity
Examples it gives
  • {"skill":"text.unicode","params":{"text":"café","form":"nfd"}}
  • https://api.duoleads.com/v1/text/unicode?text=caf%C3%A9&form=nfd

String similarity: Levenshtein, Jaro-Winkler distance and Soundex/Metaphone phon…

String similarity: compare two strings and return every standard measure in one call: Levenshtein and Damerau-Levenshtein edit distance, normalised similarity, Jaro and Jaro-Winkler, longest common subsequence, Dice coefficient on character bigrams, and the Soundex, Metaphone and NYSIIS phonetic keys of each string. Optional case folding, accent folding and whitespace normalisation before comparison. Price: $0.05 per call. Also GET /v1/text/similarity.

deterministicno-api-keytextsimilarityphonetic
Examples it gives
  • {"skill":"text.similarity","params":{"a":"kitten","b":"sitting"}}
  • https://api.duoleads.com/v1/text/similarity?a=kitten&b=sitting

URL parser: parse, canonicalize and extract the registrable domain (eTLD+1)

URL parser: parse and canonicalise a URL, and extract its registrable domain using the Public Suffix List — the part an agent needs to decide whether two URLs belong to the same owner. Returns scheme, host, port, path, decoded query parameters and fragment, the public suffix, the registrable domain (eTLD+1), the subdomain, whether the suffix is ICANN or private, plus a canonical form with default port, dot-segments and percent-encoding normalised. unicode_host uses WHATWG/UTS 46 (non-strict). Price: $0.05 per call. Also GET /v1/code/url.

deterministicno-api-keycodeurldomainspsl
Examples it gives
  • {"skill":"code.url","params":{"url":"https://a.b.example.co.uk:443/x/../y?q=1&q=2#f"}}
  • https://api.duoleads.com/v1/code/url?url=https%3A%2F%2Fa.b.example.co.uk%3A443%2Fx%2F..%2Fy%3Fq%3D1%26q%3D2%23f

Punycode converter: IDN domain to ASCII and back, with IDNA2008 label validation

Punycode converter: convert internationalised domain names between Unicode and ASCII punycode in either direction, label by label, and validate each label against IDNA2008: length, leading and trailing hyphens, the hyphen-hyphen rule at positions 3 and 4, disallowed code points and bidirectional rules. Returns both forms, the per-label breakdown and the first rule violated. Strict mode is IDNA2008 (UTS 46 non-transitional); it may reject names /v1/code/url displays. Price: $0.05 per call. Also GET /v1/code/idn.

deterministicno-api-keycodedomainsidnapunycode
Examples it gives
  • {"skill":"code.idn","params":{"domain":"bücher.example"}}
  • https://api.duoleads.com/v1/code/idn?domain=b%C3%BCcher.example

Semver parser: parse and compare versions, check range satisfaction

Semver parser and comparator: parse a semantic version into major, minor, patch, prerelease and build parts; compare two versions by precedence including prerelease ordering; or test whether a version satisfies a range expression using caret, tilde, hyphen, x-ranges and comparator sets. Returns the parsed structure, the comparison result and the reason a range did not match. Price: $0.05 per call. Also GET /v1/code/semver.

deterministicno-api-keycodeversionssemver
Examples it gives
  • {"skill":"code.semver","params":{"version":"1.2.3-rc.1+build.5"}}
  • https://api.duoleads.com/v1/code/semver?version=1.2.3-rc.1%2Bbuild.5

SHA-256/HMAC hash generator: SHA-256, SHA-512, SHA-3, Keccak-256, BLAKE2 and HMA…

Hash generator: compute a cryptographic digest of supplied data: SHA-256, SHA-384, SHA-512, SHA-1, SHA3-256, SHA3-512, Keccak-256, BLAKE2b-256 and BLAKE2b-512, plus HMAC with any of them. Input is UTF-8 text, base64 or hex bytes; output is hex, base64, base64url or base32. Returns the digest, the byte length of the input, and the exact algorithm identifier used. Price: $0.05 per call. Also GET /v1/code/hash.

deterministicno-api-keycodecryptohashing
Examples it gives
  • {"skill":"code.hash","params":{"algo":"sha256","data":"hello"}}
  • https://api.duoleads.com/v1/code/hash?algo=sha256&data=hello

JWT decoder: header, claims and expiry state (no signature verification)

JWT decoder: decode a JSON Web Token without verifying it: returns the header, the claims, the signature length and algorithm, and a computed view of the time claims — whether exp has passed, whether nbf is in the future, and the remaining lifetime in seconds against a supplied or current instant. Reports structural problems such as a missing part, invalid base64url or an alg of none. It does not and cannot verify the signature; do not use it to decide trust. Price: $0.05 per call. Also GET /v1/code/jwt.

no-api-keycodejwtsecurity
Examples it gives
  • {"skill":"code.jwt","params":{"token":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c","at":"2026-09-28T00:00:00Z"}}
  • https://api.duoleads.com/v1/code/jwt?token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c&at=2026-09-28T00%3A00%3A00Z

Geohash encoder and decoder with neighbour cells

Geohash encoder and decoder: encode a WGS-84 latitude and longitude to a geohash at a chosen precision, or decode a geohash back to its bounding box, centre point and error bounds in metres. Encoding also returns the eight neighbouring cells, which is what a caller needs to do proximity search over a geohash-indexed store without a spatial database. Price: $0.05 per call. Also GET /v1/geo/geohash.

deterministicno-api-keygeogeohash
Examples it gives
  • {"skill":"geo.geohash","params":{"op":"encode","lat":"52.3728","lon":"4.8936","precision":"9"}}
  • https://api.duoleads.com/v1/geo/geohash?op=encode&lat=52.3728&lon=4.8936&precision=9

Plus code (Open Location Code) encoder and decoder

Plus code (Open Location Code) encoder and decoder: encode coordinates as a plus code at a chosen length, or decode a full code back to its bounding box and centre. Also shortens a full code against a reference coordinate and recovers a shortened code given a reference, which is how plus codes are normally exchanged in text. Returns code length, precision in metres and validity. Price: $0.05 per call. Also GET /v1/geo/pluscode.

deterministicno-api-keygeopluscode
Examples it gives
  • {"skill":"geo.pluscode","params":{"lat":"52.3728","lon":"4.8936"}}
  • https://api.duoleads.com/v1/geo/pluscode?lat=52.3728&lon=4.8936

Point in polygon check, plus bounding box, centroid and area for GeoJSON

Point in polygon check and GeoJSON geometry: point-in-polygon with correct hole handling, bounding box, centroid, signed area in square metres, perimeter length, and ring winding order for a geometry supplied in the request. Accepts Polygon and MultiPolygon, and a GeoJSON Feature wrapping either. Area and length are geodesic on the WGS-84 ellipsoid, correct at any latitude; containment is planar in lon/lat. Price: $0.05 per call. Also GET /v1/geo/polygon.

deterministicno-api-keygeogeojsongeometry
Examples it gives
  • {"skill":"geo.polygon","params":{"geometry":"{\"type\":\"Polygon\",\"coordinates\":[[[4.85,52.35],[4.95,52.35],[4.95,52.40],[4.85,52.40],[4.85,52.35]]]}","lat":"52.3728","lon":"4.8936"}}
  • https://api.duoleads.com/v1/geo/polygon?geometry=%7B%22type%22%3A%22Polygon%22%2C%22coordinates%22%3A%5B%5B%5B4.85%2C52.35%5D%2C%5B4.95%2C52.35%5D%2C%5B4.95%2C52.40%5D%2C%5B4.85%2C52.40%5D%2C%5B4.85%2C52.35%5D%5D%5D%7D&lat=52.3728&lon=4.8936

Distance calculator: geodesic distance, bearing and destination point on WGS-84

Distance calculator: distance and direction between WGS-84 coordinates: geodesic distance by Vincenty with a haversine fallback, initial and final bearing, the midpoint, and the destination point reached from a start point on a given bearing and distance. Also computes the cumulative length of a supplied coordinate path. Results in metres, kilometres, nautical miles and miles. Price: $0.05 per call. Also GET /v1/geo/distance.

deterministicno-api-keygeogeodesydistance
Examples it gives
  • {"skill":"geo.distance","params":{"lat1":"52.3728","lon1":"4.8936","lat2":"40.7128","lon2":"-74.0060"}}
  • https://api.duoleads.com/v1/geo/distance?lat1=52.3728&lon1=4.8936&lat2=40.7128&lon2=-74.0060

Crypto address validator: detect the blockchain and verify the checksum (EVM, Bi…

Crypto address validator: identify which blockchain an address belongs to and validate its encoding: EVM EIP-55 checksum, Bitcoin base58check and bech32/bech32m with witness version, Solana base58 and on-curve check, Cosmos bech32 with its HRP, Tron, XRP, Litecoin, Dogecoin, Cardano, Polkadot SS58 and Algorand. Returns every chain the address is valid for (ambiguous when several match), the checksummed form for EVM addresses, and the reason a check failed, including unrecognised_format. Price: $0.05 per call. Also GET /v1/chain/address.

deterministicno-api-keychainblockchainaddressesvalidation
Examples it gives
  • {"skill":"chain.address","params":{"address":"0xd8da6bf26964af9d7eed9e03e53415d37aa96045"}}
  • https://api.duoleads.com/v1/chain/address?address=0xd8da6bf26964af9d7eed9e03e53415d37aa96045

Solidity function selector: Keccak-256, 4-byte selector and event topic from a s…

Solidity function selector and event topic: compute the Keccak-256 hash of a function or event signature and derive the 4-byte selector and the 32-byte topic. Normalises the signature first — strips parameter names, expands uint to uint256 and the other aliases, flattens tuples — so a signature copied from source code produces the same selector as the canonical form. Also hashes arbitrary text or hex bytes with Keccak-256. Price: $0.05 per call. Also GET /v1/chain/selector.

deterministicno-api-keychainblockchainsoliditykeccak
Examples it gives
  • {"skill":"chain.selector","params":{"signature":"transfer(address,uint256)"}}
  • https://api.duoleads.com/v1/chain/selector?signature=transfer%28address%2Cuint256%29

NUTS region lookup: EU statistical region codes, names and hierarchy

NUTS region lookup (EU statistical regions): resolve a NUTS code to its name, country and level, walk up to its parents or down to its children, or search regions by name. Covers all four levels (country, major region, basic region, small region) for the 27 member states and 12 further reporting countries, from the NUTS 2024 classification. Returns the Latin-script and local-language names plus the urbanisation, coastal and mountain typologies. Price: $0.05 per call. Also GET /v1/ref/nuts.

deterministicno-api-keyrefeustatisticsregions
Examples it gives
  • {"skill":"ref.nuts","params":{"code":"NL32B","include":"parents,typology"}}
  • https://api.duoleads.com/v1/ref/nuts?code=NL32B&include=parents%2Ctypology

Airport lookup by IATA or ICAO code: name, coordinates, elevation, time zone; ne…

Airport lookup by IATA or ICAO code: get the airport's name, city, country, ISO 3166-2 region code, WGS-84 coordinates, elevation and IANA time zone, or find the nearest airports to a coordinate within a radius. Covers every airport worldwide that holds a three-letter IATA code and scheduled service. Returns the code type that matched and the distance in kilometres for proximity results. Price: $0.05 per call. Also GET /v1/ref/airport.

deterministicno-api-keyreftravelairports
Examples it gives
  • {"skill":"ref.airport","params":{"code":"AMS"}}
  • https://api.duoleads.com/v1/ref/airport?code=AMS

Currency lookup: ISO 4217 codes, names, minor units and cash rounding

Currency lookup by ISO 4217 alphabetic or numeric code: the official English name, minor-unit exponent, fund flag, the smallest cash denomination where it differs from the minor unit, the territories that use it, and historic codes on request. Returns the correct rounding increment for cash amounts, which is what a caller needs to render or settle a price. This route returns currency facts only and never an exchange rate. Price: $0.05 per call. Also GET /v1/ref/currency.

deterministicno-api-keyreffinancecurrencyiso-4217
Examples it gives
  • {"skill":"ref.currency","params":{"code":"EUR","include":"territories"}}
  • https://api.duoleads.com/v1/ref/currency?code=EUR&include=territories

Country lookup: ISO 3166 codes, currency, TLD, UN region and ISO 3166-2 subdivis…

Country lookup: find a country or territory by ISO 3166-1 alpha-2, alpha-3 or numeric code, or by name, and get the other codes, the official and common English names, the UN M49 region and sub-region, the currencies in use, the country-code TLD, and optionally the full ISO 3166-2 subdivision list with each subdivision's type. Also resolves an ISO 3166-2 subdivision code such as NL-NH directly. Names are matched case- and accent-insensitively. Price: $0.05 per call. Also GET /v1/ref/country.

deterministicno-api-keyrefcountriesiso-3166
Examples it gives
  • {"skill":"ref.country","params":{"code":"NL"}}
  • https://api.duoleads.com/v1/ref/country?code=NL

Base converter: integers between number bases 2 to 36 (hex, binary, octal)

Base converter: convert an integer between any two numeric bases from 2 to 36 (hex, binary, octal and more), with arbitrary precision so values far beyond 2^53 are exact. Accepts an optional sign and common prefixes (0x, 0b, 0o), validates every digit against the source base, and returns the value in the target base, in decimal, and as its bit length and digit count. Price: $0.05 per call. Also GET /v1/num/radix.

deterministicno-api-keynumnumbersconversion
Examples it gives
  • {"skill":"num.radix","params":{"value":"0xdeadbeef","to":"10"}}
  • https://api.duoleads.com/v1/num/radix?value=0xdeadbeef&to=10

Number to words in 12 languages, with ordinal and currency forms

Number to words: spell a number out 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, GBP, CHF, SEK, NOK, DKK, PLN, RUB, TRY, CNY, INR, BRL, MXN, CAD, AUD, NZD, CZK, HUF); any other ISO 4217 code uses a fraction such as 56/100. Values up to 10^15. Price: $0.05 per call. Also GET /v1/num/words.

deterministicno-api-keynumnumberslocalisation
Examples it gives
  • {"skill":"num.words","params":{"value":"1234","lang":"nl"}}
  • https://api.duoleads.com/v1/num/words?value=1234&lang=nl

Statistics calculator: mean, median, standard deviation, quartiles and percentil…

Statistics calculator for a numeric array in one call: count, sum, mean, median, mode, variance and standard deviation honouring ddof (default 1, the sample form; 0 gives the population form) plus always-population *_population fields, min, max, range, the quartiles and interquartile range, skewness, kurtosis, and any requested percentiles. Percentiles use a named interpolation method so the result is reproducible rather than implementation-defined. Price: $0.05 per call. Also GET /v1/num/stats.

deterministicno-api-keynumnumbersstatistics
Examples it gives
  • {"skill":"num.stats","params":{"values":"1,2,3,4,5"}}
  • https://api.duoleads.com/v1/num/stats?values=1%2C2%2C3%2C4%2C5

Money split: allocate an amount into shares with no rounding loss

Money split: split a money amount into shares without losing or inventing a cent. Divide evenly into N parts, or by a list of ratios, and the remainder is distributed one minor unit at a time by a named, deterministic rule — largest-remainder, first-wins or last-wins — so the parts always sum exactly to the original. Uses the ISO 4217 minor-unit exponent of the currency, so zero- and three-decimal currencies work (JPY 0, KWD 3); metals and XXX are rejected. Price: $0.05 per call. Also GET /v1/num/allocate.

deterministicno-api-keynumfinancemoneyallocation
Examples it gives
  • {"skill":"num.allocate","params":{"amount":"100.00","currency":"EUR","parts":"3"}}
  • https://api.duoleads.com/v1/num/allocate?amount=100.00&currency=EUR&parts=3

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider
Duo Leads — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol
a2a
Version
1.1.0
Extensions
x402 https://github.com/google-agentic-commerce/a2a-x402/blob/main/spec/v0.2 — required of clients
Payment required per skill invocation: $0.05 in USDC on Base (eip155:8453), x402 v2, Standalone Flow. Required for skill execution (A2A-Extensions header); a message without a skill is answered for free.
A2A protocol extensions the card declares. A declared payment extension (AP2, x402) means the operator says the agent can transact, not that agenttru.st has seen it do so.
Card completeness
complete all eight fields required by a2a.proto v1.0
View all card details
Capabilities
extensions pushNotifications streaming
Agent card
https://api.duoleads.com/.well-known/agent-card.json

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