Tariffs API vs SimplyDuty.
Both expose a duty calculation API. We charge a flat monthly rate; SimplyDuty charges per call. At checkout volume, the math gets interesting fast.
SimplyDuty is one of the few standalone duty calculation APIs with public pricing — a refreshing rarity in this space. They charge per call. We charge a flat monthly rate. If you're doing more than a couple thousand calculations a month, our pricing model wins. If you're doing fifty a month, theirs does.
Tariffs API vs SimplyDuty
| Feature | Tariffs API | SimplyDuty |
|---|---|---|
| Pricing model | $199/month, 100,000 calls included | £0.10 per API call, 5 free per day |
| Per SimplyDuty's pricing page (accessed 2026-05-14): "£0.10 per API call" for both Product Classification and Duty Calculation APIs. | ||
| Effective cost at 10,000 calls/month | $199 (≈ $0.020/call) | ~£1,000 (≈ £0.10/call before free tier credits) |
| Free tier | Public docs + calculator; trial requires card | 5 free calculations per day |
| US tariff stacking | Section 301, 232, IEEPA, Chapter 99 built in | Global duty calculation; US-specific stacking detail not emphasized |
| API protocol | REST + JSON | REST API |
| Geographic focus | US imports | Global (importers, exporters, ecommerce consumers) |
| AI agent access | MCP server included | Not listed |
When SimplyDuty is the right pick
- →You need duty calculations for many destination countries, not just the US.
- →You do very low volume — a handful of calculations a month — and per-call pricing wins.
- →You need product classification (HS code lookup) alongside duty lookup as separate services.
When Tariffs API is the right pick
- ✓You're calculating duties for US imports specifically, where Section 301, 232, IEEPA, and Chapter 99 stacking matters.
- ✓Your call volume is high enough that flat pricing wins (roughly 2,000+ calls/month).
- ✓You want bulk /resolve (up to 200 HTS per request) for catalog-scale workflows.
- ✓You want MCP server access for AI agents calling tariff data.
One endpoint. Deterministic JSON.
GET /api/v1/tariffs/resolve?hts=8541.10.00.80&origin=CN returns base duty plus every applicable Chapter 99 measure with rates, effective dates, confidence scores, and attempted candidates. Built specifically for US imports — every Section 301, 232, and IEEPA measure is resolved and stacked in the right legal order.
GET /api/v1/tariffs/resolve?hts=8541.10.00.80&origin=CN
{
"summary": {
"applicable_ad_valorem_rate": 0.0,
"resolved_additional_ad_valorem_rate": 25.0,
"total_resolved_ad_valorem_rate": 25.0
},
"base_tariff": { "percentage_component": 0.0 },
"additional_measures": [
{
"program": "section_301",
"chapter_99_code": "9903.91.05",
"resolved_rate": { "percentage_component": 0.25 }
}
]
}Switching from SimplyDuty
Is the per-call vs flat pricing really cheaper at volume?
Yes, by a wide margin once you're past a few thousand calls. At 10,000 calls/month, per-call pricing at £0.10/call is roughly £1,000 (~$1,250). Our flat $199 covers up to 100,000 calls. The crossover is around 2,000 calls/month.
Do you cover non-US destinations like SimplyDuty?
Not today. Tariffs API is built for US imports specifically — the Harmonized Tariff Schedule, country of origin, and US trade-measure stacking. If you need duty calculations for imports into the EU, UK, or other markets, SimplyDuty or a regional alternative is a better fit.
Do you do HS code classification?
No. We don't classify products. We assume you already know the HTS code and just need the resolved duty and applicable measures. For classification, work with a licensed customs broker or a classification service.
- SimplyDuty pricing page · accessed 2026-05-14
- SimplyDuty homepage · accessed 2026-05-14