# TariffWatch HTS Changes Feed

> TariffWatch HTS Changes Feed is a paid API for AI agents from oracles-production.up.railway.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Returns scored HTS duty-rate changes, HTS schedule revisions, and Federal Register tariff actions, optionally filtered by HTS code prefix.

## Facts

- Endpoint: GET https://oracles-production.up.railway.app/v1/tariffwatch/changes
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tariffwatch-hts-changes-feed-5969ee60
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_73LDK-RWO4SGJingXOkrB

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 tariffwatch-hts-changes-feed-5969ee60
```

Example prompt: Show me all tariff changes for HTS codes starting with 6109 since 2025-01-01T00:00:00Z, and only include ones with a significance score of at least 7.

## When to prefer this

Use this endpoint when you need machine-readable, scored tariff change events across the entire HTS schedule, especially when you want to filter by specific HTS code prefixes or recency. Prefer this over Federal Register full-text search when you need structured duty-rate and HTS-revision change records with significance scoring rather than raw regulatory document text.

## Known failure modes

- Invalid since parameter format returns 400 (must be ISO-8601)
- min_significance out of range 1-10 returns 400
- limit exceeds 500 returns 400
- No matching changes returns empty changes array with count 0
- Payment not provided or insufficient returns 402
- HTS prefix not matching any known codes returns empty result silently

## How this service works

US import duty / tariff RATE CHANGES: new HTS duty rates, Section 301/232/IEEPA tariff actions, and Federal Register tariff notices across the Harmonized Tariff Schedule since a timestamp, each scored 1-10 for impact. Answers "did the import duty rate for my HTS code change?" Scope to your codes with ?hts=<prefix> (e.g. ?hts=6109 for cotton apparel).

## Output

A JSON object with a count, a source label, and an array of change records. Each record includes: entity ID, change type, title, summary, structured detail object, detected timestamp, effective date, significance score (1-10), and a primary-source URL for verification.

## 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",
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 500,
       "minimum": 1
      },
      "since": {
       "type": "string",
       "format": "date-time",
       "description": "Only changes detected after this ISO-8601 instant"
      },
      "min_significance": {
       "type": "integer",
       "maximum": 10,
       "minimum": 1,
       "description": "Keep only changes scored at least this"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "count": {
       "type": "integer"
      },
      "source": {
       "type": "string"
      },
      "changes": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "type": {
          "type": "string"
         },
         "title": {
          "type": "string"
         },
         "detail": {
          "type": "object"
         },
         "summary": {
          "type": "string"
         },
         "entityId": {
          "type": "string"
         },
         "sourceUrl": {
          "type": [
           "string",
           "null"
          ],
          "description": "Primary-source link for verification"
         },
         "detectedAt": {
          "type": "string",
          "format": "date-time"
         },
         "significance": {
          "type": "integer",
          "maximum": 10,
          "minimum": 1
         },
         "effectiveDate": {
          "type": [
           "string",
           "null"
          ]
         }
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 1,
  "source": "tariffwatch",
  "changes": [
   {
    "type": "rate_change",
    "title": "Duty rate changed for HTS 6109.10.00",
    "entityId": "hts:6109.10.00",
    "sourceUrl": "https://hts.usitc.gov/search?query=6109.10.00",
    "significance": 7
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tariffwatch-hts-changes-feed-5969ee60/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)