Amazon Keyword Expansion

Find related Amazon keywords and compare search demand. Call the Amazon Keyword Expansion API via REST or MCP from 88 credits per call.

CostRecent Avg. 189 · Range 133–1328 credits / call

Try online

POST · https://api.nexscope.ai/js/keywords/by-keywordMCP · nexscope_amazon_keyword_expansion

What this API does

Find related Amazon keywords and compare search demand. The request accepts marketplace, searchTerms, needCount, sort, minMonthlySearchVolumeExact. Its documented result includes keywordInfoList, name, country, monthlySearchVolumeExact, monthlySearchVolumeBroad, monthlyTrend, quarterlyTrend, dominantCategory.

Amazon Keyword Expansion API use cases

Build a keyword shortlist

To build a keyword shortlist, a marketplace analyst submits marketplace and searchTerms to Amazon Keyword Expansion. The returned keywordInfoList, name, country help choose candidate search terms for further investigation.

Compare search demand signals

A marketplace analyst uses Amazon Keyword Expansion with marketplace and searchTerms to compare search demand signals. The returned keywordInfoList, name, country help compare keyword demand within the requested market scope.

Plan a content or advertising test

For this workflow, a marketplace analyst calls Amazon Keyword Expansion with marketplace and searchTerms to plan a content or advertising test. The result helps select terms for a content or advertising experiment.

Amazon Keyword Expansion API FAQ

What does the Amazon Keyword Expansion API return?

Find related Amazon keywords and compare search demand. The documented output includes keywordInfoList, name, country, monthlySearchVolumeExact, monthlySearchVolumeBroad, monthlyTrend, quarterlyTrend, dominantCategory. It corresponds to the supplied marketplace, searchTerms, needCount, sort, minMonthlySearchVolumeExact. Optional fields can be absent; a missing value should not be interpreted as a measured zero. Example values illustrate the response shape, rather than live account results.

How many credits does the Amazon Keyword Expansion API cost?

The current documented cost is Recent Avg. 189 · Range 133–1328 credits / call. This is the same cost shown at the top of this page. If a range or estimate is displayed, the final charge depends on the request. Review your available credits and the pricing page before calling the API, and check API usage records for the actual charge.

How do I call the Amazon Keyword Expansion API from my app or an MCP client?

Send a POST request to https://api.nexscope.ai/js/keywords/by-keyword with your API key as a Bearer token and the JSON inputs shown in API integration. In a compatible MCP client such as Claude or Cursor, connect Nexscope and call nexscope_amazon_keyword_expansion. Use the MCP arguments shown in the MCP guide, or switch Online test to MCP to review its request before adding it to your app.

View plans and credits Connect this API with MCP

Try this API

Endpoint

https://api.nexscope.ai/js/keywords/by-keyword

MCP method

nexscope_amazon_keyword_expansion

Step 1 of 3 · Authenticate

Authentication

All run endpoints require a user API key. Send it as a bearer token in the Authorization header.

Authorization: Bearer nk-xxxxxxxxxxxxxxxxx

Missing or invalid API keys return an authentication error. Manage keys from .

Step 2 of 3 · Send a request

POSThttps://api.nexscope.ai/js/keywords/by-keyword

Run an API

Send a JSON request body using the parameters described below.

Example request

Replace YOUR_API_KEY, then run this command in your terminal.

curl -X POST 'https://api.nexscope.ai/js/keywords/by-keyword' \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "marketplace": "us",
  "needCount": 20,
  "searchTerms": "yoga mat"
}'

Code example

{
  "marketplace": "us",
  "needCount": 20,
  "searchTerms": "yoga mat"
}

Step 3 of 3 · Inspect the result

Check the response

Read code for the request status and data for the result. Open the parameter and response reference for the full field definitions.

HTTP status codes

Code	Description
200	Default HTTP response for both success and many business errors. Only outer JSON code 0 indicates success or asynchronous acceptance; inspect data for the result.
429	Execution admission rate limit; honor Retry-After when present.
503	Execution admission is temporarily unavailable; honor Retry-After when present.
Opt-in	X-Nexscope-Http-Status: semantic maps controller-handled business errors to HTTP status on run and task routes. Pre-authentication failures, such as a missing API key (code 11209), may still return HTTP 200 before this mapping. Always check the outer JSON code; malformed requests and infrastructure failures may also return non-200 HTTP responses.

View parameters & response Try online

All categories/ Amazon Research JS

POSThttps://api.nexscope.ai/js/keywords/by-keyword

Run this API

Send a JSON request to execute this API and receive the documented response payload.

Try the free keyword tool Open tester

Endpoint

Method	`POST`
Path	`https://api.nexscope.ai/js/keywords/by-keyword`
Auth	`Bearer API key`
Content-Type	`application/json`

Request parameters

Name	Type	Required	Description
`marketplace`	`string`	required	Target market code. Optional values: `us`, `uk`, `de`, `in`, `ca`, `fr`, `it`, `es`, `mx`, `jp` Example: us
`searchTerms`	`string`	required	Seed keyword (single keyword string)
`needCount`	`integer`	optional	Return the total number of results
`sort`	`string`	optional	Sorting field, defaults to descending order by exact search volume Example: -monthly_search_volume_exact
`minMonthlySearchVolumeExact`	`integer`	optional	Exact search volume minimum
`maxMonthlySearchVolumeExact`	`integer`	optional	Exact search volume cap
`minMonthlySearchVolumeBroad`	`integer`	optional	Broad search volume minimum
`maxMonthlySearchVolumeBroad`	`integer`	optional	Broad search volume cap
`minWordCount`	`integer`	optional	Minimum number of keywords (used to filter long-tail words)
`maxWordCount`	`integer`	optional	Key words maximum number of words
`minOrganicProductCount`	`integer`	optional	Minimum number of natural ranking products
`maxOrganicProductCount`	`integer`	optional	Maximum number of natural ranking products

Response example

Platform response envelope. code 0 indicates success or acceptance; data contains the business result.

No response example is published for this API. Refer to the response fields below.

Response fields

Response field reference (17 fields)

Name	Type	Required	Description
`costToken`	`integer`	optional	Number of tokens consumed
`keywordInfoList`	`array`	optional	Keyword information list
`name`	`string`	optional	Keyword name
`country`	`string`	optional	market code
`monthlySearchVolumeExact`	`integer`	optional	Average monthly exact match search volume
`monthlySearchVolumeBroad`	`integer`	optional	Average monthly broad match search volume
`monthlyTrend`	`number`	optional	Monthly search volume percentage change
`quarterlyTrend`	`number`	optional	Quarterly search volume percentage change
`dominantCategory`	`string`	optional	Category with the highest proportion in search results
`relevancyScore`	`integer`	optional	Relevance score to seed word
`easeOfRankingScore`	`integer`	optional	Ease of ranking score (the higher, the easier it is to rank)
`organicProductCount`	`integer`	optional	Number of naturally ranked products
`sponsoredProductCount`	`integer`	optional	Advertising product quantity
`ppcBidExact`	`number`	optional	Exact match PPC recommended bid (USD)
`ppcBidBroad`	`number`	optional	Broad match PPC recommended bid (USD)
`spBrandAdBid`	`number`	optional	Sponsored Brand Ad Recommended Bid (USD)
`recommendedPromotions`	`integer`	optional	Recommended promotional gift quantity

Responses

Code	Description
200	Default HTTP response for both success and many business errors. Only outer JSON code 0 indicates success or asynchronous acceptance; inspect data for the result.
429	Execution admission rate limit; honor Retry-After when present.
503	Execution admission is temporarily unavailable; honor Retry-After when present.
Opt-in	X-Nexscope-Http-Status: semantic maps controller-handled business errors to HTTP status on run and task routes. Pre-authentication failures, such as a missing API key (code 11209), may still return HTTP 200 before this mapping. Always check the outer JSON code; malformed requests and infrastructure failures may also return non-200 HTTP responses.

Data source, freshness, and limitations

Source, freshness, coverage, rate limits, and estimation notes are not specified in this API definition unless they appear in the request or response field documentation above. Do not assume official marketplace data or real-time freshness when it is not explicitly documented.

Step 1 of 2 · Connect your MCP client

MCP

V2 recommended

Connect remote agents through the standard MCP 2025-11-25 Streamable HTTP endpoint. Use OAuth 2.1 Authorization Code with PKCE, or an API key for compatibility.

POST https://api.nexscope.ai/mcp
MCP-Protocol-Version: 2025-11-25
Content-Type: application/json

Authentication

OAuth clients request the mcp:tools scope. The endpoint's 401 response advertises protected-resource metadata for authorization discovery.

Step 2 of 2 · Call the tool

Call a tool

{
  "jsonrpc": "2.0",
  "id": "tool-call-1",
  "method": "tools/call",
  "params": {
    "name": "nexscope_amazon_keyword_expansion",
    "arguments": {
      "marketplace": "us",
      "needCount": 10,
      "searchTerms": "phone case"
    }
  }
}

Legacy MCP v1

Existing API-key clients can continue using the compatibility endpoint. New integrations should use MCP v2.

GET / POST /mcp/legacy

Online test

Execute the current API with your API key and JSON payload. Online tests use this site's configured API environment; the Endpoint and copyable examples use the public integration address.

88 credits / callAPI usage records

Try it

Send a real request with the same contract shown in the reference.

Endpoint

/js/keywords/by-keyword

MCP method

nexscope_amazon_keyword_expansion

API key*

JSON payload*

cURL

curl -X POST \
  https://api.nexscope.ai/js/keywords/by-keyword \
  -H "Authorization: Bearer nk-..." \
  -H "Content-Type: application/json" \
  -d '{ "marketplace": "us", "needCount": 20, "searchTerms": "yoga mat" }'

Response

No response yet. Run the request to see the response here.

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