# Tariff Audit HTS Duty Checker

> Tariff Audit HTS Duty Checker is a paid API for AI agents from oracles-production.up.railway.app, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-14).

Returns the full US import duty picture for an HTS code and origin country, including MFN base rate, Section 301/232/IEEPA stacking, combined effective rate, recent changes, and an LLM-generated landed-duty verdict.

## Facts

- Endpoint: GET https://oracles-production.up.railway.app/v1/tariffaudit/check
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tariff-audit-hts-duty-checker-80113b69
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FQ7x10hC1ISpz0xQGgXbG

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 tariff-audit-hts-duty-checker-80113b69
```

Example prompt: What's the true all-in import duty rate for HTS code 8471.30 coming from China — include the MFN base rate, any Section 301 or IEEPA stacking, and give me an LLM verdict on the real landed duty I should budget for?

## When to prefer this

Use this endpoint when you need a single authoritative answer on the full US import duty burden for a specific HTS code — especially when Chapter 99 stacking (Section 301, Section 232, IEEPA) is relevant and you don't want to manually cross-reference the 3,000-page HTS schedule. Prefer this over raw HTS lookups when you need an LLM-synthesized verdict on the true effective landed rate rather than raw statutory rates.

## Known failure modes

- Missing required 'hts' query parameter returns a 400 error
- Invalid or unrecognized HTS code returns an error or empty findings array
- Origin country not recognized or not applicable returns default MFN-only result
- Payment not provided or insufficient USDC balance returns 402 Payment Required
- Upstream HTS or tariff data source unavailable causes 500 or degraded response
- LLM verdict generation fails and falls back to template-generated response

## How this service works

PREMIUM one-call import-duty verdict: pass ?hts=<code>&origin=<country> and get the base MFN rate, Chapter-99 stacking (Section 301/232/IEEPA), a combined effective-rate estimate, recent tracked changes, and an LLM verdict on the true landed duty — the answer a supply-chain agent needs instead of parsing the 3,000-page HTS.

## Output

Returns a structured response containing: an array of findings (each with tariff layer details such as MFN rate, Section 301, Section 232, and IEEPA surcharges), a combined effective-rate estimate, recent tracked changes to that HTS code's duty rates, an overall verdict string summarizing the true landed duty burden, and a flag indicating whether the verdict was LLM-generated or template-based.

## 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": [
      "hts"
     ],
     "properties": {
      "hts": {
       "type": "string"
      },
      "origin": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "findings": {
       "type": "array",
       "items": {
        "type": "object"
       }
      },
      "generatedBy": {
       "enum": [
        "llm",
        "template"
       ],
       "type": "string"
      },
      "overallVerdict": {
       "type": "string"
      },
      "packagesAudited": {
       "type": "integer"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tariff-audit-hts-duty-checker-80113b69/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from oracles-production.up.railway.app](https://www.zero.xyz/host/oracles-production.up.railway.app/llms.txt)