# Moz, free: Related keywords API

> You can use the API to retrieve keyword metrics such as monthly search volume, research ranking opportunities or strengthen content briefs by generating related keywords [...]

Moz's related keywords API on its Free plan. It costs $0.00 per 1,000 keywords. It returns none of the 6 key fields we check: Search volume, Monthly trend, Cost per click, Competition and 2 more.
We rank 53 plans by price. [Mangools's $15 monthly plan](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt) costs the least per 1,000 keywords: $0.0001. Mangools charges for each page of results. We count 10,000 keywords on each page to get the $0.0001 price.
[Mangools](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt), [DataForSEO](https://datacircle.dev/related-keywords-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-dataforseo-labs-google-keyword-ideas-live/llms.txt) and [SE Ranking](https://datacircle.dev/related-keywords-apis/se-ranking/29-monthly-add-on-monthly-billing-get-v1-keywords-similar/llms.txt) are the best related keywords API providers in our benchmark.

- This page: https://datacircle.dev/related-keywords-apis/moz/free
- [Best related keywords API in 2026](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://moz.com/products/api/pricing
- Request: `POST https://api.moz.com/jsonrpc`
- API key: with the plan, on https://moz.com/products/api/pricing
- Its API docs: https://moz.com/api/docs/data.keyword.serp.related-keyword.list
- Sold by: Moz (https://moz.com)
- Checked: 2026-10-29

## In the answer

- Completeness: 0%

## Price

- $ per 1,000 keywords: $0.00
- Per: result
- Billing: free

## Charges

- Start fee: $0.00
- Also pays for: from the same budget: URL Metrics · Links · Brand Authority · Link Intersect · Linking Root Domains · Link Status · Anchor Text · Final Redirect · Top Pages · Global Top Pages · Global Top Root Domains · Index Metadata · Usage Data · Keyword Metrics · Search Intent · Ranking Keywords

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: You can use the API to retrieve keyword metrics such as monthly search volume, research ranking opportunities or strengthen content briefs by generating related keywords [...]

## Data

- Keep data: no limit
- Use data: use the Service to access the Data for Subscriber’s internal business purpose requiring analyzing URLs, (ii) display Data internally within its business, and (iii) display Data externally provided such display is done in accordance with Our attribution policy [...] Subscriber will not (nor will permit anyone else to) : (a) sell or otherwise charge anyone specifically or solely for the access or use of the Service except as permitted under the Agreement, (b) create any derivative works of the Service, (c) combine Data with constant factors [...], (d) copy, store, archive or extract Data in a manner not explicitly permitted herein, [...] (f) permit third parties to use the API key, [...] When displaying Moz API data (links, metrics, and anchor text), use our approved logo and link it to https://moz.com/. [...] You may not white-label our metrics. When you display data from Moz API, you must label it as originating from the Moz API.

## Plan

- Pay: $0
- You get: 50 credits a month
- Enough for: 50 results a month

## Rate limit

- Per second: 0.1
- Batch: 1

## The call

- You send: Content-Type header "application/json", jsonrpc "2.0", id, method "data.keyword.serp.related-keyword.list", params.data
- Method: POST
- Path: /jsonrpc

## About the plan

- Plan: Free
- Who can get it: anyone with a valid, non-expired credit card

## The only field the plan's answer can hold

keyword

## Moz's plans (7)

- [Moz, free](https://datacircle.dev/related-keywords-apis/moz/free/llms.txt): $0.00 per 1,000, 0% complete
- [Moz, $20 monthly](https://datacircle.dev/related-keywords-apis/moz/20-monthly/llms.txt): $6.667 per 1,000, 0% complete
- [Moz, $75 monthly](https://datacircle.dev/related-keywords-apis/moz/75-monthly/llms.txt): $5.00 per 1,000, 0% complete
- [Moz, $125 monthly](https://datacircle.dev/related-keywords-apis/moz/125-monthly/llms.txt): $2.50 per 1,000, 0% complete
- [Moz, $250 monthly](https://datacircle.dev/related-keywords-apis/moz/250-monthly/llms.txt): $2.083 per 1,000, 0% complete
- [Moz, $500 monthly](https://datacircle.dev/related-keywords-apis/moz/500-monthly/llms.txt): $1.00 per 1,000, 0% complete
- [Moz, contact us](https://datacircle.dev/related-keywords-apis/moz/contact-us/llms.txt): 0% complete

## Moz's calls for this API (1)

- `POST /jsonrpc`: [Moz, free](https://datacircle.dev/related-keywords-apis/moz/free/llms.txt)

## Moz's APIs (5)

- [Moz: backlink API pricing, 7 plans](https://datacircle.dev/backlink-apis/moz/free/llms.txt)
- [Moz: domain authority API pricing, 7 plans](https://datacircle.dev/domain-authority-apis/moz/free/llms.txt)
- [Moz: keyword research API pricing, 7 plans](https://datacircle.dev/keyword-research-apis/moz/free/llms.txt)
- [Moz: ranked keywords API pricing, 7 plans](https://datacircle.dev/ranked-keywords-apis/moz/free/llms.txt)
- [Moz: related keywords API pricing, 7 plans](https://datacircle.dev/related-keywords-apis/moz/free/llms.txt)

## Moz: related keywords API alternatives

- [DataForSEO, top-up from $50, Pay as you go, POST /v3/dataforseo_labs/google/related_keywords/live](https://datacircle.dev/related-keywords-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-dataforseo-labs-google-related-keywords-live/llms.txt): $0.12 per 1,000, 100% complete, 1 month
- [AnyAPI, top-up from $10, Manual top-up, POST /v1/run/seo.related_keywords](https://datacircle.dev/related-keywords-apis/anyapi/top-up-from-10-manual-top-up-post-v1-run-seo-related-keywords/llms.txt): $0.16 per 1,000, 100% complete, 1 month
- [Keywords Everywhere, $168 yearly, Silver, POST /v1/get_related_keywords](https://datacircle.dev/related-keywords-apis/keywords-everywhere/168-yearly-silver-post-v1-get-related-keywords/llms.txt): $0.84 per 1,000, 0% complete
- [SpyFu, $119 monthly, Pro + AI, GET /apis/keyword_api/v2/related/getAlsoBuysAdsForKeywords](https://datacircle.dev/related-keywords-apis/spyfu/119-monthly-pro-ai-get-apis-keyword-api-v2-related-getalsobuysadsforkeywords/llms.txt): $1.00 per 1,000, 33% complete, 1 month

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-29.

- https://moz.com/api
- https://moz.com/api-general-conditions
- https://moz.com/api/docs
- https://moz.com/api/docs/guides/error-handling
- https://moz.com/api/docs/guides/getting-started
- https://moz.com/api/docs/guides/rate-limiting
- https://moz.com/help/links-api/getting-started/legal
- https://moz.com/products/api/pricing