# AEML Tariff/Trade-Measure Legal-Force Gauge

> AEML Tariff/Trade-Measure Legal-Force Gauge is a paid API for AI agents from aeml-x402.zeabur.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-13).

Returns a structured three-leg forensic snapshot of a US trade measure's legal force lifecycle, review pipeline, and downstream trade-flow cascade for a given entity (e.g. Section 301/232/201, AD/CVD, IEEPA, de minimis).

## Facts

- Endpoint: GET https://aeml-x402.zeabur.app/gauge/tariff-region
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aeml-tariff-trade-measure-legal-force-gauge-f31367d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__44DFfN9rwm27zACqMG_q

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 aeml-tariff-trade-measure-legal-force-gauge-f31367d5
```

Example prompt: Pull the legal-force gauge for Section 301 China List 1 tariffs — I need to know if the measure is still imposed or expired, whether there's an active sunset review or CIT/WTO challenge, and what upstream import-flow signals look like right now.

## When to prefer this

Use this endpoint when you need a forensic, multi-leg snapshot of a specific US trade measure's current legal force, review pipeline exposure, and downstream import-flow cascade — especially for procurement risk assessment, importer compliance review, or trade-flow monitoring. Prefer this over general news or legal databases when you need structured, provenance-tagged, offline-verifiable data sourced directly from USTR, Federal Register, USITC, WTO, and CBP, and when cadence-aware freshness (monthly/quarterly/annual official sources) is important.

## Known failure modes

- Unknown or misspelled entity key returns 422 or empty legs
- Measure data frozen at source (dead_source flag set, stale freshness)
- Official source update lag causes stale readings despite fresh cadence
- No official classification ruler available for a given signal leg (422 + no_ch)
- Payment failure (x402 $0.1 USDC not settled) blocks response
- WTO/CIT challenge status may lag behind real-time court filings

## How this service works

[3-LEG] Tariff and customs measure chain, one trade measure (?entity=sec301-china-list1): leading review pipeline stage -> current current legal force -> realized lifecycle from imposed to expired or rescinded (confirmation gate). A sequential chain, not one reading - confidence = how many legs are lit, in order. Sources: USTR, Federal Register, USITC. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

## Output

A structured JSON object with a 'legs' object containing signal readings (signal_id, current value, observed_at, data_age_hours, record_hash) for each of the three forensic legs (legal lifecycle, review pipeline, trade-flow cascade); a cross-line narrative summarizing observations across legs; provenance metadata including freshness basis and data lineage traceable to official sources; an offline-verifiable Ed25519-signed citation; scope and grade disclosures; and optional decision_points listing swappable entity tags for follow-on calls.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "entity"
     ],
     "properties": {
      "entity": {
       "type": "string",
       "examples": [
        "sec301-china-list1",
        "sec301-china-list3",
        "sec301-list4a",
        "sec301-ev-modifications",
        "sec232-steel",
        "sec232-aluminum"
       ],
       "description": "required - monitored object id, paired with signal_id; free list at GET /gauge/catalog?signal_id=<signal_id> -> signals[0].entities[]",
       "x-accepted-values": {
        "all": "https://api.truthbear.co/schemas/gauge-tariff-region.input.json",
        "shown": 6,
        "total": 22
       }
      }
     },
     "additionalProperties": false
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "const": "json"
    },
    "example": {}
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aeml-tariff-trade-measure-legal-force-gauge-f31367d5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aeml-x402.zeabur.app](https://www.zero.xyz/host/aeml-x402.zeabur.app/llms.txt)