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Duo Data Utilities: IBAN, ISIN, VAT and Tax ID, Barcode, Timezone, Geo APIs
com.duoleads.api/data-utilities in the official MCP registry.
Endpoint https://api.duoleads.com/mcp. Source: github.com/hiesem/duo-data-utilities.
The registry describes it as: IBAN, ISIN, VAT/tax ID, GTIN validation; timezone, geo, text, chain utilities. Pay per call
We read its 33 tools on 2026-10-27. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
vat_tax_id_validate gtin_barcode_validate isin_cusip_sedol_validate iban_validate iban_generate timezone_convert dst_transitions business_days_calculate rrule_expand calendar_convert slug_generate cyrillic_transliterate unicode_confusables_check string_similarity url_parse punycode_convert semver_compare hash_generate jwt_decode geohash_encode_decode plus_code_encode_decode point_in_polygon geo_distance crypto_address_validate solidity_function_selector nuts_region_lookup airport_lookup currency_lookup country_lookup base_convert number_to_words statistics_calculate money_split
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[](https://lazaretto.dev/mcp-registry/com-duoleads-api-data-utilities)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.