{"activeVersionTag":"latest","latestAvailableVersionTag":"latest","collection":{"info":{"_postman_id":"5017d9e2-ce72-41b0-b521-bc9c18a41e18","name":"CBP Duty Calculation API","description":"# CBP Duty Calculation API\n\n## Overview\n\nAPI for calculating US Customs and Border Protection (CBP) duties against the Harmonized Tariff Schedule of the United States (HTSUS).\n\nThe endpoints available are:\n\n- `POST /api/v1/duties/calculate` — compute the total duty owed for a single product line, broken down per duty layer (base rate, Ch. 99 supplemental surcharges) and per component (compound and content-based rates).\n    \n- `GET /api/v1/hts-codes` — look up a single HTS entry and return its full hierarchical description, accepted units of measure, and the components it requires (if any).\n    \n\nThe authentication flow is OAuth 2.0 client-credentials. All requests require `Authorization: Bearer` .\n\n## Endpoints\n\n### `POST /api/v1/duties/calculate` — Calculate duties\n\nResolves the request's `htsCode` against the HTSUS data (including chapter 98 replacements and chapter 99 supplementals), and calculates the duties owed based on input data, returning the following information:\n\n- `htsClassification` — the resolved HTS entry.\n    \n- `baseCalculations[]` — one entry per base duty layer that contributed to the total.\n    \n- `componentCalculations[]` — when the product carries components (compound rates or content-based rates), one entry per component with its HTS code, per-component duty layers, and the component's total duty.\n    \n- `totalDutiesOwed` — sum of all `baseCalculations[].dutiesOwed` and `componentCalculations[].dutiesOwed` in USD.\n    \n\nSpecial-case routing: when the request's HTS code falls under Chapter 76 (aluminum articles), the calculator switches to the Section 232 split-duty strategy, which requires the request to supply `aluminumSmelt` (single-unit aluminum content value, weight in kg, primary country of smelt). When the HTS code resolves to a sliding-duty entry in heading 1701 (raw sugar), the request must supply `sugarPolarizationDegree`.\n\n### `GET /api/v1/hts-codes?htsCode={code}` — HTS code lookup\n\nReference lookup for client integrations to discover what an HTS code resolves to before submitting a calculation request. Accepts the HTS code in either dotted (`9101.11.40`) or undotted (`91011140`) form; both are accepted, and returns the following information:\n\n- `htsCode` — the normalized HTS code in canonical dotted format.\n    \n- `text` — the **full hierarchical description** (heading + subheading + tariff line + statistical suffix, concatenated).\n    \n- `unitsOfMeasure` — the accepted units of measure for the entry (e.g. `[\"Number\"]`, `[\"Kg\"]`).\n    \n- `requiredComponents` — the components a duty calculation request must supply for this code. Each entry has the component's HTS code and its leaf-level description (not the full path). Empty list when no components are required.\n    \n\n## Authentication\n\nOAuth 2.0 client-credentials flow. Token endpoint:\n\n- Sandbox: `https://auth.dutycollection-sandbox.safepackage.com/realms/SafePackage/protocol/openid-connect/token`\n    \n\nSubmit the resulting JWT as `Authorization: Bearer` on each request.\n\n## Errors\n\nAll `400 Bad Request` responses follow the shape `{ \"errors\": [{ \"code\", \"propertyName\", \"errorMessage\", \"attemptedValue\" }] }`. Codes are stable and prefixed `V_` for validation failures (e.g. `V_InvalidHtsCode`, `V_HtsCodeNotFound`, `V_UnitOfMeasureMismatch`, `V_MissingRequiredComponents`, `V_CountryNotFound`). `404 Not Found` is returned without a body for HTS lookups against unknown codes. `401 Unauthorized` and `403 Forbidden` are returned by the auth middleware before the handler runs.\n\n## Support\n\n- API access provisioning: `api-access@safepackage.com`\n    \n- Technical support: `support@safepackage.com`","schema":"https://schema.getpostman.com/json/collection/v2.0.0/collection.json","isPublicCollection":false,"owner":"48610445","team":5478190,"collectionId":"5017d9e2-ce72-41b0-b521-bc9c18a41e18","publishedId":"2sBXwqrW6N","public":true,"publicUrl":"https://docs.dutycalculation.safepackage.com","privateUrl":"https://go.postman.co/documentation/48610445-5017d9e2-ce72-41b0-b521-bc9c18a41e18","customColor":{"top-bar":"FFFFFF","right-sidebar":"303030","highlight":"BA2D53"},"documentationLayout":"classic-double-column","customisation":{"metaTags":[{"name":"description","value":""},{"name":"title","value":""}],"appearance":{"default":"light","themes":[{"name":"dark","logo":null,"colors":{"top-bar":"212121","right-sidebar":"303030","highlight":"BA2D53"}},{"name":"light","logo":null,"colors":{"top-bar":"FFFFFF","right-sidebar":"303030","highlight":"BA2D53"}}]}},"version":"8.11.6","publishDate":"2026-06-08T16:36:35.000Z","activeVersionTag":"latest","documentationTheme":"light","metaTags":{"title":"","description":""},"logos":{"logoLight":null,"logoDark":null}},"statusCode":200},"environments":[],"user":{"authenticated":false,"permissions":{"publish":false}},"run":{"button":{"js":"https://run.pstmn.io/button.js","css":"https://run.pstmn.io/button.css"}},"web":"https://www.getpostman.com/","team":{"logo":"https://res.cloudinary.com/postman/image/upload/t_team_logo_pubdoc/v1/team/6a1ffc52eb77a6ab256c4805fd6f58a01d860f8ec177f7ac31d4bd8ec860ed57","favicon":"https://safepackage.com/favicon.ico"},"isEnvFetchError":false,"languages":"[{\"key\":\"csharp\",\"label\":\"C#\",\"variant\":\"HttpClient\"},{\"key\":\"csharp\",\"label\":\"C#\",\"variant\":\"RestSharp\"},{\"key\":\"curl\",\"label\":\"cURL\",\"variant\":\"cURL\"},{\"key\":\"dart\",\"label\":\"Dart\",\"variant\":\"http\"},{\"key\":\"go\",\"label\":\"Go\",\"variant\":\"Native\"},{\"key\":\"http\",\"label\":\"HTTP\",\"variant\":\"HTTP\"},{\"key\":\"java\",\"label\":\"Java\",\"variant\":\"OkHttp\"},{\"key\":\"java\",\"label\":\"Java\",\"variant\":\"Unirest\"},{\"key\":\"javascript\",\"label\":\"JavaScript\",\"variant\":\"Fetch\"},{\"key\":\"javascript\",\"label\":\"JavaScript\",\"variant\":\"jQuery\"},{\"key\":\"javascript\",\"label\":\"JavaScript\",\"variant\":\"XHR\"},{\"key\":\"c\",\"label\":\"C\",\"variant\":\"libcurl\"},{\"key\":\"nodejs\",\"label\":\"NodeJs\",\"variant\":\"Axios\"},{\"key\":\"nodejs\",\"label\":\"NodeJs\",\"variant\":\"Native\"},{\"key\":\"nodejs\",\"label\":\"NodeJs\",\"variant\":\"Request\"},{\"key\":\"nodejs\",\"label\":\"NodeJs\",\"variant\":\"Unirest\"},{\"key\":\"objective-c\",\"label\":\"Objective-C\",\"variant\":\"NSURLSession\"},{\"key\":\"ocaml\",\"label\":\"OCaml\",\"variant\":\"Cohttp\"},{\"key\":\"php\",\"label\":\"PHP\",\"variant\":\"cURL\"},{\"key\":\"php\",\"label\":\"PHP\",\"variant\":\"Guzzle\"},{\"key\":\"php\",\"label\":\"PHP\",\"variant\":\"HTTP_Request2\"},{\"key\":\"php\",\"label\":\"PHP\",\"variant\":\"pecl_http\"},{\"key\":\"powershell\",\"label\":\"PowerShell\",\"variant\":\"RestMethod\"},{\"key\":\"python\",\"label\":\"Python\",\"variant\":\"http.client\"},{\"key\":\"python\",\"label\":\"Python\",\"variant\":\"Requests\"},{\"key\":\"r\",\"label\":\"R\",\"variant\":\"httr\"},{\"key\":\"r\",\"label\":\"R\",\"variant\":\"RCurl\"},{\"key\":\"ruby\",\"label\":\"Ruby\",\"variant\":\"Net::HTTP\"},{\"key\":\"shell\",\"label\":\"Shell\",\"variant\":\"Httpie\"},{\"key\":\"shell\",\"label\":\"Shell\",\"variant\":\"wget\"},{\"key\":\"swift\",\"label\":\"Swift\",\"variant\":\"URLSession\"}]","languageSettings":[{"key":"csharp","label":"C#","variant":"HttpClient"},{"key":"csharp","label":"C#","variant":"RestSharp"},{"key":"curl","label":"cURL","variant":"cURL"},{"key":"dart","label":"Dart","variant":"http"},{"key":"go","label":"Go","variant":"Native"},{"key":"http","label":"HTTP","variant":"HTTP"},{"key":"java","label":"Java","variant":"OkHttp"},{"key":"java","label":"Java","variant":"Unirest"},{"key":"javascript","label":"JavaScript","variant":"Fetch"},{"key":"javascript","label":"JavaScript","variant":"jQuery"},{"key":"javascript","label":"JavaScript","variant":"XHR"},{"key":"c","label":"C","variant":"libcurl"},{"key":"nodejs","label":"NodeJs","variant":"Axios"},{"key":"nodejs","label":"NodeJs","variant":"Native"},{"key":"nodejs","label":"NodeJs","variant":"Request"},{"key":"nodejs","label":"NodeJs","variant":"Unirest"},{"key":"objective-c","label":"Objective-C","variant":"NSURLSession"},{"key":"ocaml","label":"OCaml","variant":"Cohttp"},{"key":"php","label":"PHP","variant":"cURL"},{"key":"php","label":"PHP","variant":"Guzzle"},{"key":"php","label":"PHP","variant":"HTTP_Request2"},{"key":"php","label":"PHP","variant":"pecl_http"},{"key":"powershell","label":"PowerShell","variant":"RestMethod"},{"key":"python","label":"Python","variant":"http.client"},{"key":"python","label":"Python","variant":"Requests"},{"key":"r","label":"R","variant":"httr"},{"key":"r","label":"R","variant":"RCurl"},{"key":"ruby","label":"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