Stop your Amazon DE listings from getting suppressed.

Which fits you?

Deterministic checks surface suppression risk signals before you submit to Amazon DE.

Running compliance QA for an agency? ListLoco also works for agencies and consultants who manage multiple seller accounts or client accounts on Amazon DE — the same deterministic gates flag the compliance-risk signals in every client's catalog before you submit. See the agency workflow →

Check your category's compliance rules

Amazon DE applies different required attributes and restricted-term lists by category. Jump straight to the free checker pre-set for your product category:

Checking many listings at once? The Hosted API supports batch requests so you don't have to paste them in one at a time — see batch API plans →

Try ListLoco live — no sign-up required

No account needed. Run the sample listing through the same deterministic quality gate the API uses — entirely in your browser.

Step 1 · Send a request via RapidAPI

Get your key by subscribing on RapidAPI. Replace <YOUR_RAPIDAPI_KEY> and <YOUR_RAPIDAPI_HOST> with the values from your RapidAPI dashboard:

curl -X POST "https://<YOUR_RAPIDAPI_HOST>/localize" \
  -H "Content-Type: application/json" \
  -H "X-RapidAPI-Key: <YOUR_RAPIDAPI_KEY>" \
  -H "X-RapidAPI-Host: <YOUR_RAPIDAPI_HOST>" \
  --data @examples/amazon-en-de-cordless-drill.json

curl -X POST https://listloco.hayasaka.app/localize \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <YOUR_API_KEY>" \
  --data @examples/amazon-en-de-cordless-drill.json

Request body (examples/amazon-en-de-cordless-drill.json):

{
  "marketplace": "amazon",
  "sourceLang": "en",
  "targetLang": "de",
  "listing": {
    "title": "Cordless drill AB-1200 with 8.5 kg battery and 2 m cable",
    "description": "Cordless drill AB-1200 with a 8.5 kg battery and a 2 m cable.",
    "brand": "Bosch",
    "material": "Metall",
    "size": "M",
    "color": "blue",
    "quantity": 1
  },
  "glossary": { "preserve": ["Bosch"] },
  "dictionary": {
    "cordless": "kabellos",
    "drill": "Bohrmaschine",
    "with": "mit",
    "and": "und",
    "a": "ein",
    "battery": "Akku",
    "cable": "Kabel",
    "blue": "blau"
  }
}

Step 2 · Get back gate-verified JSON

{
  "localized": {
    "title": "kabellos Bohrmaschine AB-1200 mit 8.5 kg Akku und 2 m Kabel",
    "bullets": [
      "AB-1200 bürstenlos Bohrmaschine, 8.5 kg Akku",
      "2 m Kabel inklusive"
    ]
  },
  "gates": {
    "titleLength": { "pass": true },
    "bannedWords": { "pass": true },
    "requiredAttributes": { "pass": true },
    "preservation": { "pass": true },
    "glossary": { "pass": true },
    "backTranslation": { "pass": true }
  },
  "violations": [],
  "pass": true
}

Notice the model number AB-1200, the 8.5 kg weight and the 2 m cable survive the round-trip exactly — that is the preservation gate, not luck. When any gate fails, pass is false and the offending rule is listed in violations instead of shipping silently.

Code samples — drop into your app

Via RapidAPI — Node.js (built-in fetch):

const body = {
  "marketplace": "amazon",
  "sourceLang": "en",
  "targetLang": "de",
  "listing": {
    "title": "Cordless drill AB-1200 with 8.5 kg battery and 2 m cable",
    "description": "Cordless drill AB-1200 with a 8.5 kg battery and a 2 m cable.",
    "brand": "Bosch",
    "material": "Metall",
    "size": "M",
    "color": "blue",
    "quantity": 1
  },
  "glossary": { "preserve": ["Bosch"] },
  "dictionary": {
    "cordless": "kabellos",
    "drill": "Bohrmaschine",
    "with": "mit",
    "and": "und",
    "a": "ein",
    "battery": "Akku",
    "cable": "Kabel",
    "blue": "blau"
  }
};

const response = await fetch('https://<YOUR_RAPIDAPI_HOST>/localize', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-RapidAPI-Key': '<YOUR_RAPIDAPI_KEY>',
    'X-RapidAPI-Host': '<YOUR_RAPIDAPI_HOST>'
  },
  body: JSON.stringify(body)
});
const result = await response.json();
console.log(result);

Via RapidAPI — Python (requests):

import requests

payload = {
  "marketplace": "amazon",
  "sourceLang": "en",
  "targetLang": "de",
  "listing": {
    "title": "Cordless drill AB-1200 with 8.5 kg battery and 2 m cable",
    "description": "Cordless drill AB-1200 with a 8.5 kg battery and a 2 m cable.",
    "brand": "Bosch",
    "material": "Metall",
    "size": "M",
    "color": "blue",
    "quantity": 1
  },
  "glossary": {"preserve": ["Bosch"]},
  "dictionary": {
    "cordless": "kabellos",
    "drill": "Bohrmaschine",
    "with": "mit",
    "and": "und",
    "a": "ein",
    "battery": "Akku",
    "cable": "Kabel",
    "blue": "blau"
  }
}

response = requests.post(
    "https://<YOUR_RAPIDAPI_HOST>/localize",
    json=payload,
    headers={
        "X-RapidAPI-Key": "<YOUR_RAPIDAPI_KEY>",
        "X-RapidAPI-Host": "<YOUR_RAPIDAPI_HOST>"
    }
)
print(response.json())

Direct / self-hosted (non-RapidAPI) — Node.js (built-in fetch):

const body = {
  "marketplace": "amazon",
  "sourceLang": "en",
  "targetLang": "de",
  "listing": {
    "title": "Cordless drill AB-1200 with 8.5 kg battery and 2 m cable",
    "description": "Cordless drill AB-1200 with a 8.5 kg battery and a 2 m cable.",
    "brand": "Bosch",
    "material": "Metall",
    "size": "M",
    "color": "blue",
    "quantity": 1
  },
  "glossary": { "preserve": ["Bosch"] },
  "dictionary": {
    "cordless": "kabellos",
    "drill": "Bohrmaschine",
    "with": "mit",
    "and": "und",
    "a": "ein",
    "battery": "Akku",
    "cable": "Kabel",
    "blue": "blau"
  }
};

const response = await fetch('https://listloco.hayasaka.app/localize', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer <YOUR_API_KEY>'
  },
  body: JSON.stringify(body)
});
const result = await response.json();
console.log(result);

Direct / self-hosted (non-RapidAPI) — Python (requests):

import requests

payload = {
  "marketplace": "amazon",
  "sourceLang": "en",
  "targetLang": "de",
  "listing": {
    "title": "Cordless drill AB-1200 with 8.5 kg battery and 2 m cable",
    "description": "Cordless drill AB-1200 with a 8.5 kg battery and a 2 m cable.",
    "brand": "Bosch",
    "material": "Metall",
    "size": "M",
    "color": "blue",
    "quantity": 1
  },
  "glossary": {"preserve": ["Bosch"]},
  "dictionary": {
    "cordless": "kabellos",
    "drill": "Bohrmaschine",
    "with": "mit",
    "and": "und",
    "a": "ein",
    "battery": "Akku",
    "cable": "Kabel",
    "blue": "blau"
  }
}

response = requests.post(
    "https://listloco.hayasaka.app/localize",
    json=payload,
    headers={"Authorization": "Bearer <YOUR_API_KEY>"}
)
print(response.json())

Language quickstarts (full request body + copy-paste code): Python · Node.js · PHP — see the examples page.

Get your API key on RapidAPI See pricing

How it works

Three deterministic steps — same input always produces the same output. Full API reference in OpenAPI spec →

Why ListLoco instead of raw machine translation

Why a deterministic quality gate, not just machine translation

• Title stays within the Amazon DE character limit.
• No banned / prohibited words in the localized copy.
• Required category attributes are present.
• Numbers, model numbers, and units from the source are preserved exactly (e.g. 42 EU / 8.5 US never disappears).
• Back-translation drift is measured to catch meaning loss; failing output is flagged honestly, not returned silently.

Current MVP covers Amazon and the English → German language pair. More marketplaces and language pairs reuse the same rule-template + glossary + quality-gate framework.

Check a listing free — no signup

Pricing — predictable, stepped tiers

Prices in USD. One listing = one language for ~200–500 words. Figures match our single source of truth in src/pricing/plans.js.

Subscribe — get your API key Read the API docs

Built for developers

A dependency-free, deterministic JSON-over-HTTP API: the same input always returns the same output. Send a listing, get back marketplace-compliant, gate-verified structured JSON.

API reference OpenAPI spec

Frequently Asked Questions