Resource Center
Tools, catalogs, and guides for global trade teams.
A practical index for Tandom's free tools, public data catalogs, developer resources, and evergreen guides for recurring trade-compliance questions.
Free tools
Run a check before you file.
Public tools for quick trade-compliance checks, backed by the same data layer Tandom exposes through its products and APIs.
US Tariff Calculator
Calculate import duties by HTS code, origin country, declared value, and entry date, with tariff layers and citations.
Open tool
AD/CVD Intelligence lookup
Check antidumping and countervailing duty exposure by HTS code, country, product description, manufacturer, and exporter.
Open lookup
HTS Classification
Coming soonDefensible HTS classification workflow with ruling references and structured reasoning.
View roadmap
Industry research
Primary-research analyses of US import policy.
Surveys of customs brokers, importers, and trade lawyers, paired with original analysis. Built to answer the questions trade media and broker LinkedIn actually argue about.
Catalogs and data
Search the source material.
Canonical public catalogs for the reference data behind Tandom's calculations and checks.
AD/CVD Catalog
Search AD/CVD orders, ITC investigations, manufacturer rates, and CBP CSMS messages.
Browse catalog
HTS Catalog
Browse US tariff codes, chapters, headings, and product-level duty context.
Browse catalog
Rate Change Feed
Coming soonTrack tariff, AD/CVD, and regulatory changes by HTS code, country, or case.
View roadmap
Guides
Get the answers to recurring questions.
Short, practical guides for recurring trade-compliance questions. The full library is at tandom.ai/resources/guides.
Most recent guides
How to show landed cost at checkout for cross-border ecommerce
Implementation playbook for showing landed cost (duty + fees) at checkout after the August 2025 de minimis suspension. Decision matrix by volume, runnable Tandom API code, postal vs courier math, and a contrarian callout for when you should NOT integrate.
Open resource
How to choose a duty calculation API for cross-border ecommerce
Honest provider comparison across Zonos, Shopify Markets DDP, Easyship, Passport, Avalara CrossBorder, and Tandom. Pricing, integration breadth, AD/CVD coverage, DDP guarantee fine print, and decision framework by use case.
Open resource
The DTC import playbook after Section 321 ended
Nine operational steps from catalog audit to customer comms. Broker selection, ACE setup, entry-type decision, recordkeeping, and a worked transition timeline for a 80,000-order/month apparel brand.
Open resource
Postal vs courier duty rules for low-value imports
How postal and courier shipments are duty-handled differently into the US. The Feb 28, 2026 ad valorem cutover, per-package math on a $30 phone case, and AOV-band decision framework.
Open resource
How to calculate US import duties
A working guide to the inputs, the layers, and the math behind a US entry summary in 2026. MFN, Section 232, Section 301, Section 122, AD/CVD, MPF, HMF, with a real worked example.
Open resource
How Chapter 99 tariff layers stack on a single entry
How to read, order, and report Chapter 99 HTS codes alongside the base classification on a US entry summary in 2026. For brokers and compliance teams.
Open resource
Developers
Build on Tandom's trade infrastructure.
API and agent resources for teams wiring Tandom into internal tools, broker workflows, and customer-facing software.
Tandom API
Overview of available APIs, closed-beta resources, and example calls.
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API Reference
Canonical endpoint documentation, authentication, parameters, examples, and changelog.
Open docs
MCP connectors
Set up Tandom with AI tools and agent clients that can call trade APIs directly.
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AI Agent Workflows
Patterns for using Tandom APIs with agentic workflows across customs, compliance, and operations.
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MCP workflows
Reference workflows for connecting AI assistants to Tandom through MCP-compatible clients.
View MCP setup