# SiteCheck US Tariff Lookup

> SiteCheck US Tariff Lookup is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).

Looks up US Harmonized Tariff Schedule (HTS) entries by HTS number or description keyword, returning duty rates and Chapter 99 additional duties from USITC.

## Facts

- Endpoint: GET https://api.sitecheck-api.workers.dev/api/tariff/us?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-us-tariff-lookup-81d91cbf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-ZVrITC5o6NV24_P4jAqK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sitecheck-us-tariff-lookup-81d91cbf
```

Example prompt: What is the US import duty rate for portable laptops — can you search the US Harmonized Tariff Schedule for HTS number 8471.30 and also show me any Chapter 99 additional duties that might apply?

## When to prefer this

Use this endpoint when you need to look up current US import duty rates from the official USITC Harmonized Tariff Schedule, especially when you have an HTS number or prefix to query, or when you need to search by product description keywords. Prefer this over manual lookups when an agent needs structured tariff data including Chapter 99 additional duties programmatically.

## Known failure modes

- No results found for the given HTS prefix or keyword query
- Query returns truncated results if limit is exceeded
- HTS number not recognized or malformed returns empty results
- USITC upstream API unavailability causes failure
- Payment required (402) if x402 micropayment header is missing

## How this service works

Pay-per-call tools for AI agents: image generation, speech-to-text, text-to-speech, embeddings, LLM chat, website audits and contact enrichment, web page to Markdown reader, PDF to text, sitemap URLs, tech stack detection, translation, exchange rates, e-mail pre-check, domain RDAP/DNS lookup, Solana token checks, trending tokens and wallet holdings, plus business and compliance data (EU VAT/VIES, IBAN, LEI/GLEIF, US recalls, OSHA/EPA violations, UK insolvency notices). Also: SEO metadata, link checking, redirect chains, security headers, mail DNS (SPF, DMARC, DKIM), QR codes, language detection, photo EXIF, identifier validation, image OCR, SEC filings, SEC financials, Congress bills, macro rates, UK company data, GitHub repo stats, Hacker News, Wikipedia, gas prices, Solana swap quotes, ERC-20 token checks, ENS names, EVM wallet balances, EVM balances, transactions and contract calls, Solana transactions and accounts, crypto prices, candles and order books, DeFi TVL, yields and stablecoins, SEC insider trades, weather, geocoding and holidays, IP owners and postcodes, npm, PyPI and crates package data and vulnerabilities, GitHub profiles, arXiv papers and DOIs, structured extraction, summaries, sentiment and reranking, HTML tables and RSS feeds, Bitcoin fees, addresses and transactions, Bitcoin address balances, Bitcoin transaction status, EVM calldata decoding, verified EVM contracts, Hyperliquid perpetual markets, Hyperliquid account positions, Polymarket odds, crypto fear and greed, DeFi fees, DEX volume, company registries of four countries, ISIN, CUSIP and ticker lookup, SEC full-text search, SEC 8-K events, FDA drug labels, FDA adverse event counts, clinical trials, PubMed articles, US federal grants, EU public tenders, NPI provider lookup, US address geocoding, USGS earthquakes, NWS weather alerts, sunrise and moon times, time zone conversion, distance and bearing, GDACS disaster alerts, llms.txt checks, AI crawler access, tracker and cookie audits, certificate transparency, site logos and icons, GitHub releases, GitHub issues, Stack Overflow answers, read-only Wikidata queries, text moderation, image descriptions, text classification, named entity extraction, PII redaction, phone number checks, cron explanations, JSON Schema validation, whale transfers, SSL certificate expiry, Markdown to HTML, PageSpeed scores, Product Hunt launches, sanctions screening (OFAC, EU, UN, UK), flight fare search, YouTube transcripts, speech to text from media links, perpetual funding rates, crypto technical indicators, crypto news headlines, crypto spot conversion, World Bank macro indicators, loan and investment calculator, grammar checks, readability scores, keyword extraction, text diffs, transliteration and slugs, text chunking, subtitle translation, tone rewrites, working days, date calculations, unit conversion, book lookup, food nutrition, airport lookup, tide predictions, nearby places, robots.txt checks, hashes, encode and decode, JWT inspection, UUIDs and passwords, User-Agent parsing, subdomain discovery, uptime checks, VIN decoding, UK EORI checks, SWIFT and BIC checks, stock ticker lookup, invoice extraction, resume parsing, address parsing, prediction-market data, multi-chain RPC and chain data, compliance and government data, web data, search and research, AI text jobs. Plus prediction-market search, briefs, quotes and unsigned buy transactions, powered by Panta. Payment: x402, USDC on Base, Solana or Arc. No signup, no API key.

## Output

Returns a JSON object with matching HTS entries (HTS number, description, general rate, Column 2 rate, special rate, units, footnotes) plus any applicable Chapter 99 additional duty lines, a source attribution, timestamp, and a disclaimer that the data is informational only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "q": {
       "type": "string",
       "description": "Words to find in descriptions, e.g. portable data processing (every word must appear)"
      },
      "hts": {
       "type": "string",
       "description": "HTS number or prefix, e.g. 8471.30 or 8471300100"
      },
      "limit": {
       "type": "string",
       "description": "Lines to return, 1 to 25, default 10"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "additionalDuties are Chapter 99 lines that USITC returns with the search; check whether each applies to the goods and origin.",
  "count": 1,
  "query": {
   "hts": "8471.30"
  },
  "source": "USITC Harmonized Tariff Schedule REST API (hts.usitc.gov, public domain)",
  "results": [
   {
    "units": [
     "No."
    ],
    "indent": 1,
    "footnotes": [],
    "htsNumber": "8471.30.01.00",
    "column2Rate": "35%",
    "description": "Portable automatic data processing machines, weighing not more than 10 kg, consisting of at least a central processing unit, a keyboard and a display",
    "generalRate": "Free",
    "specialRate": null
   }
  ],
  "checkedAt": "2026-10-15T18:21:06.382Z",
  "disclaimer": "Information only, not legal advice. Verify with official sources.",
  "additionalDuties": [
   {
    "units": [],
    "indent": 1,
    "footnotes": [
     "See chapter 99 statistical note 1."
    ],
    "htsNumber": "9903.41.15",
    "column2Rate": null,
    "description": "Automatic data processing machines, of the type of which the constituent units are integrated in the same housing, whether finished or unfinished, which incorporate a microprocessor-based calculating mechanism, are capable of handling data words of at least 16-bits off the microprocessor, and are designed for use with a non-cathode-ray tube (non-CRT) display unit, whether or not capable of use without an external power source (provided for in subheading 8471.30 or 8471.41)",
    "generalRate": "100%",
    "specialRate": null
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-us-tariff-lookup-81d91cbf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitecheck-api.workers.dev](https://www.zero.xyz/host/api.sitecheck-api.workers.dev/llms.txt)