Resource Center
Make better supplier and import decisions.
Free tools, public data, and practical guides for US industrial sourcing teams.
Compare landed cost, check import risk, research classifications, and prepare for a new manufacturer.
Start here
Start with the decision in front of you.
Choose the task that matches the question your team needs to answer now.
Evaluate a new manufacturer
Turn a real product requirement into a structured supplier search, comparable responses, and a path through samples and first-order readiness.
Discuss the requirement
Estimate landed cost
Model US duties by HTS code, origin, declared value, and entry date before a quote advances.
Open the calculator
Check AD/CVD exposure
Check the HTS code, country, scope language, manufacturer, and exporter—not just a tariff-code match.
Run a lookup
Research an HTS classification
Browse US tariff codes, chapters, headings, duty context, and the source material behind a classification decision.
Browse the HTS catalog
When a tool is not enough
Get help carrying a supplier decision forward.
A calculator can quantify duty. It cannot confirm technical fit, organize supplier follow-up, manage samples, or close the issues between a quote and a first order. Tandom can run that work as a paid sourcing project while your team keeps final approval.
Tell us what you need to sourceFree tools and public data
Check the economics and risk behind a supplier quote.
Use the live calculators and source catalogs directly. No sales call is required.
US Tariff Calculator
Calculate duties with tariff layers and citations using the same inputs you would use to evaluate a supplier quote.
Calculate duties
AD/CVD Intelligence Lookup
Investigate possible antidumping and countervailing duty exposure by product, origin, manufacturer, and exporter.
Check exposure
HTS Catalog
Browse US tariff codes, chapter structure, and product-level duty context in a public reference catalog.
Browse HTS data
AD/CVD Catalog
Search orders, investigations, scope material, manufacturer rates, and related public notices.
Browse case data
Practical guides
Work through sourcing and import decisions.
Use the guide library when you need the method, source material, and worked example, not just a result.
How to compare overseas manufacturing quotes
A technical-gate-first supplier quote comparison template for normalizing price, currency, MOQ, tooling, Incoterms, freight, duty, lead time, and risk.
15 min read
How to create a quote-ready manufacturing RFQ
Build a manufacturing RFQ that controls drawings, revisions, volumes, substitutions, evidence, tooling, packaging, and supplier quote returns.
16 min read
How to develop an alternative manufacturer and qualify a second source
A stage-gated guide for turning an incumbent industrial part into a qualified, quote-ready, sample-backed alternative prepared for a first order.
16 min read
Supplier first-order readiness checklist before the first PO
Use four evidence-based release gates before a new industrial supplier receives the first PO, payment, production authorization, or shipment release.
17 min read
Manufacturing sample approval: prototype, FAI, and PPAP
Choose the right sample stage, verify production intent, record test evidence and deviations, and keep production release under buyer control.
18 min read
Asia vs Latin America sourcing: an industrial buyer framework
Compare process fit, supplier depth, qualification effort, actual lanes, origin, duties, and continuity before choosing a manufacturing region.
19 min read
How to verify a manufacturer's identity and capability
Confirm the seller, factory, exporter, payee, quality system, product capability, and capacity behind an overseas supplier quote.
17 min read
How to evaluate MOQ, tooling, lead time, payment terms, and capacity
A practical gate for evaluating a manufacturer's MOQ, price breaks, tooling, lead time, payment milestones, and demonstrated production capacity.
15 min read
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.
12 min read
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.
11 min read
How Section 232 steel, aluminum, and copper duties apply in 2026
What changed April 6, 2026, what stayed the same, and how to file a steel, aluminum, or copper line in ACE without leaving duty exposure on the table.
13 min read
How Section 301 China tariff exclusions work in 2026
What the 178 active Section 301 exclusions cover, how to claim 9903.88.69 on an entry, and what changes when the November 10, 2026 deadline passes.
11 min read
What changed for low-value shipments after the de minimis suspension
What changed for low-value DTC and ecommerce shipments after Section 321 de minimis was suspended in 2025. Filing, fees, and duty math through 2027.
11 min read
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.
16 min read
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.
13 min read
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.
15 min read
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.
11 min read
How to qualify a product for USMCA preferential treatment
A practical guide to qualifying a product for USMCA preferential tariff treatment. Rules of origin, the 9 certification data elements, and a worked example.
13 min read
How to check AD/CVD exposure by HTS code
A practical workflow for checking antidumping and countervailing duty exposure on a US entry. Why HTS-only checks fail, how to read the scope text, manufacturer rates, scope rulings, with a real lookup against an active order.
11 min read
How to read an AD/CVD case number and find the order scope
Decode case numbers like A-570-983 and C-489-830 to find country, petition type, and the Federal Register scope text fast. For brokers and importers.
9 min read
How to determine if a product is in scope of an AD/CVD order
Scope text is authoritative. The HTS list is illustrative. A practical guide for brokers to read scope, find past rulings, and file under 19 CFR 351.225.
12 min read
How to find the right manufacturer or exporter rate inside an AD/CVD order
Find the right manufacturer or exporter rate inside an AD/CVD order. Cash deposit cascade, separate rates, all-others, and PRC-wide rates for brokers.
12 min read
How to find the right HTS code for your product
A working classification workflow: search by description, read the section and chapter notes, apply the GRIs, confirm the 10-digit suffix.
13 min read
Tariff classification for products with mixed materials and components
How to classify composite goods and retail kits with the GRIs: relative specificity, essential character, sets put up for retail sale, GRI 5 cases.
12 min read
How to request a CBP binding ruling
When to file an eRulings request, what to put in it, where it goes, and how the binding effect works. Written for brokers and compliance teams.
11 min read
How to subscribe to and triage CBP CSMS messages
How to subscribe to CBP Cargo Systems Messaging Service (CSMS) and triage the messages that change broker filing behavior, without losing the ones that matter.
12 min read
How to track CBP CSMS duty-rate changes for your import catalog
A practical manual workflow for US industrial importers to monitor CBP CSMS messages, identify affected HTS codes, verify duty impact, and document the handoff.
10 min read
How trade compliance APIs fit into broker workflows
Where trade compliance APIs can support a filing workflow, and where Tandom's current public surface stops: HTS research, duty calculation, AD/CVD screening, and read-only MCP tools.
11 min read
How to wire the Tandom Duty Calculator API into a TMS or broker software
Drop the Tandom Duty Calculator API into a TMS, broker software, or in-house ERP. Code samples, the response shape, and ACE reporting order, in 2026.
11 min read
How to bulk-review SKU descriptions for HTS classification
A practical CSV workflow for cleaning product descriptions, searching current HTS references, and routing every candidate code to documented human review.
8 min read
How to review broker HTS classifications with public HTS data
A disciplined second-pass workflow for checking filed codes, current legal text, duty layers, and trade-risk signals without pretending an API replaces judgment.
9 min read
How to extract HTS-ready fields from a commercial invoice
A manual, reviewable workflow for US industrial importers to turn a commercial invoice into structured product, origin, valuation, HTS, and duty inputs.
12 min read
How to expose the Tandom AD/CVD lookup as a Claude MCP tool
Connect Claude to Tandom's read-only AD/CVD lookup over Model Context Protocol. Current tool catalog, JSON-RPC request shapes, and a worked example, in 2026.
12 min read
How to use Claude or ChatGPT for safer HTS code research
A prompt and verification workflow that uses current read-only HTS tools to produce a candidate brief—not a made-up final classification.
9 min read
Free API and AI access
Connect Tandom’s free tools to your systems.
Use the maintained API reference or connect compatible AI clients to the public tool set.
Free API overview
Use Tandom’s live tariff, duty, and AD/CVD data in your own internal workflows.
View the API
API reference
Review authentication, endpoints, parameters, response examples, and the changelog.
Open the documentation
Connect the tools to your AI
Give compatible AI clients access to Tandom’s public, read-only import tools through MCP.
View connectors
Active requirement
Bring us the product, drawing, specification, or current quote.
We will review it first, then arrange a call to understand the requirement and decide whether a sourcing project makes sense.