Rate scope
Do you need only a base rate, or Chapter 99, preferences, trade remedies, and quotas too?
Independent provider comparison · 2026
Which tariff data provider actually fits your workflow?
A low-cost API, fully stacked US duty resolution, global ecommerce checkout, and an evidence-ready import workflow solve different jobs. This guide uses vendor-published facts instead of forcing them into a fake universal ranking.
Pricing and capabilities last verified July 13, 2026
Short answer
For final US filing research, start with USITC, USTR, and CBP sources and broker review. For a low-cost US/EU API prototype, start with Tariff Rate. For developer-ready US Chapter 99 and 301/232/IEEPA stacking, evaluate Tariffs API. For guaranteed global ecommerce checkout, evaluate Zonos. For an enterprise global trade stack, evaluate Avalara. For a small import team that needs source evidence, monitoring, and human handoff, evaluate TariffsChart.
Decide what you are buying before comparing vendors
Delivery model
An API response, research dataset, checkout guarantee, human report, and broker workflow are different products.
Evidence
Do you need source URLs, retrieved dates, historical snapshots, and transferable assumptions?
Cost of error
A prototype lookup, purchase plan, customer checkout, and customs filing require different review standards.
Seven real options at a glance
| Provider | Published pricing | Coverage / workflow | Best for | Important limitation |
|---|---|---|---|---|
| USITC HTS + USTR / CBPOfficial US sources | Free public access | US HTS schedule and primary policy notices | Final source verification before broker review or filing | The workflow is fragmented. You still need to connect base rates, special programs, trade remedies, exclusions, quotas, and product facts. |
| WTO TTD + World Bank WITSOfficial multi-country research | Public research access; reuse terms vary | 150+ economies, annual tariff lines, trade and time series | Historical and macro country comparisons | Annual notified data is not a live landed-cost quote. IDB/CTS dissemination restrictions and dataset terms need review before commercial redistribution. |
| Tariff RateLow-cost developer API | $0 / 10 calls; $10 / 500; $50 / 10,000 monthly | US HTS + EU TARIC, text search and origin-specific rates | A budget API prototype that needs US and EU lookup | A lookup API is not an audit trail, broker workflow, guaranteed landed-cost service, or customs filing product. |
| Tariffs APIUS duty-stacking API | $49 / 500; $199 / 10,000; $499 / 100,000 monthly | US base rate + Chapter 99 / 301 / 232 / IEEPA resolution | Developers embedding a US stacked-duty result | It explicitly does not file customs entries, issue binding classifications, provide freight, or replace legal and broker review. |
| Zonos Landed CostGuaranteed ecommerce landed cost | $2 + 10% of duties, taxes and other import fees per order | International ecommerce checkout, DDP and landed-cost guarantee | Merchants collecting duties and taxes at checkout | The transaction-based economics and checkout scope are different from a lightweight research workspace or low-volume lookup API. |
| Avalara Trade and Tariff LibraryEnterprise trade data | Sales-led; no public tariff-library price found | Global schedules, duty rates and REST API workflows | Enterprise tax and trade-compliance stacks | Evaluation usually requires a sales process and a broader implementation than a small importer needs. |
| TariffsChartImport-planning and evidence workflow | Free tools; $29 check; $29/mo monitor; $149/30-day pilot | US planning, source snapshots, monitoring and broker handoff | Small import teams that need evidence and human handoff before automation | It is planning software, not a licensed customs broker, filing system, global checkout guarantee, or fully automated classification service. The current pilot API exposes source-backed base-rate fields rather than a guaranteed fully stacked duty. |
Provider-by-provider: strengths, boundaries, and fit
Official US sources
USITC HTS + USTR / CBP
Free public access
Strength
The authoritative starting point for HTS text, legal notes, Chapter 99 references, and agency notices.
Important limitation
The workflow is fragmented. You still need to connect base rates, special programs, trade remedies, exclusions, quotas, and product facts.
Official multi-country research
WTO TTD + World Bank WITS
Public research access; reuse terms vary
Strength
Broad official coverage for applied and bound tariffs, imports, bilateral relationships, and long-run analysis.
Important limitation
Annual notified data is not a live landed-cost quote. IDB/CTS dissemination restrictions and dataset terms need review before commercial redistribution.
Low-cost developer API
Tariff Rate
$0 / 10 calls; $10 / 500; $50 / 10,000 monthly
Strength
The lowest published entry price in this comparison, with a simple RapidAPI path and both US and EU coverage.
Important limitation
A lookup API is not an audit trail, broker workflow, guaranteed landed-cost service, or customs filing product.
US duty-stacking API
Tariffs API
$49 / 500; $199 / 10,000; $499 / 100,000 monthly
Strength
A focused US API with historical as-of queries, watched codes, alerts, bulk resolution on higher tiers, and transparent published limits.
Important limitation
It explicitly does not file customs entries, issue binding classifications, provide freight, or replace legal and broker review.
Guaranteed ecommerce landed cost
Zonos Landed Cost
$2 + 10% of duties, taxes and other import fees per order
Strength
Operational checkout infrastructure and a guaranteed calculation can be more valuable than a raw rate lookup for cross-border stores.
Important limitation
The transaction-based economics and checkout scope are different from a lightweight research workspace or low-volume lookup API.
Enterprise trade data
Avalara Trade and Tariff Library
Sales-led; no public tariff-library price found
Strength
A broad enterprise product family spanning tariff data, classification, calculation, and compliance integrations.
Important limitation
Evaluation usually requires a sales process and a broader implementation than a small importer needs.
Import-planning and evidence workflow
TariffsChart
Free tools; $29 check; $29/mo monitor; $149/30-day pilot
Strength
Combines free research, a one-time human-prepared check, saved source evidence, change monitoring, and broker-ready planning packets.
Important limitation
It is planning software, not a licensed customs broker, filing system, global checkout guarantee, or fully automated classification service. The current pilot API exposes source-backed base-rate fields rather than a guaranteed fully stacked duty.
Choose by workflow, not by feature count
Final US filing verification
Use the USITC HTS and relevant agency notices as primary sources, then ask a licensed broker to confirm product facts, classification, and applicable duty layers. No SaaS result replaces this step.
Build a low-cost lookup prototype
If you only need to validate an API integration with US and EU coverage, Tariff Rate has the lowest published entry price here. Do not buy a human workflow you do not need.
Embed stacked US duty results
If the product must resolve Chapter 99, Section 301, 232, or IEEPA layers, Tariffs API publishes a more complete scope than TariffsChart’s current base-rate pilot API.
Run global checkout or enterprise compliance
Evaluate Zonos when you need duty collection and a landed-cost guarantee at checkout. Evaluate Avalara for global tariff libraries, classification, and enterprise integration. Neither is a lightweight research tool.
Review a small SKU set before buying inventory
If the job is “which layers should I check, which sources should I save, and what should I hand to my broker?”, begin with one Quick Check. Upgrade only when repeated monitoring justifies it.
Where TariffsChart fits
Validate one real product before buying a subscription or API
We do not package a base lookup as enterprise compliance. Use the one-time report for one product, Pro for recurring source monitoring, or the 30-day pilot when a team needs API access, a human digest, and broker handoff in one bounded test.
Methodology and disclosure
Pricing and capabilities come from each provider’s own product, pricing, or developer pages. We did not log into paid products or independently benchmark throughput, accuracy, or support. TariffsChart has no paid ranking or affiliate relationship with these providers. Prices can change; verify the linked official source before purchase.
Frequently asked questions
What is the cheapest tariff API?
Among the public plans verified here, Tariff Rate lists 10 free calls per month, $10 for 500, and $50 for 10,000. Low price does not make a lookup suitable for filing, duty stacking, or audit trails.
How is TariffsChart different from Tariffs API?
Tariffs API is the stronger fit for developers who need published US additional-duty stacking. TariffsChart focuses on source records, a human Quick Check, change monitoring, and broker handoff; its current pilot API promises source-backed base-rate fields only.
Can software output be used directly for customs filing?
Not by default. Classification, origin, valuation, preference eligibility, Chapter 99 measures, and quotas can change the result. Verify primary sources and use a licensed broker or qualified professional for an actual filing.