# SpyFu Related Keyword Research API

> SpyFu Related Keyword Research API is a paid API for AI agents from SpyFu at spyfu.mpp.tempo.xyz, paid per call via MPP, $0.02/call, status unknown (last checked 2026-10-11).

Returns related keywords for a given keyword using SpyFu's SEO and PPC database, helping discover keyword variations and opportunities

## Facts

- Endpoint: GET https://spyfu.mpp.tempo.xyz/apis/keyword_api/v2/related/*?utm_source=zero.xyz
- Price: $0.02/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Provider: SpyFu
- Docs: https://developer.spyfu.com
- Website: https://spyfu.com
- Tags: seo, ppc, keyword-research, competitor-analysis, ads, data, search
- Canonical page: https://www.zero.xyz/c/spyfu--1e23a462
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CORHpQumIAhEDwQC-6Nvt

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 spyfu--1e23a462
```

Example prompt: Use SpyFu to find related keywords for 'project management software' so I can expand my SEO campaign and find related terms I might be missing.

## When to prefer this

Choose this endpoint when you need to expand a keyword list by discovering semantically related and associated terms, especially for SEO or PPC campaign planning. Prefer this over a general keyword search endpoint when you already have a seed keyword and want to find variations, related topics, and adjacent search terms. Best when you need to build keyword clusters or find gaps in your existing keyword strategy.

## Known failure modes

- Invalid or missing keyword parameter returns 400 error
- Rate limit exceeded returns 429 error
- No related keywords found for obscure or misspelled terms returns empty results
- Authentication or payment failure returns 401/402 error
- Keyword too long or contains unsupported characters returns 422 error

## How this service works

Keyword research

## Output

A list of keywords related to the input keyword, along with associated metrics such as monthly search volume, cost-per-click (CPC), competition level, and SEO/PPC difficulty scores drawn from SpyFu's 18+ year historical database.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "__pentest_poisoned_at"
 ],
 "properties": {
  "__pentest_poisoned_at": {
   "type": "string",
   "description": "VULN-TEST: schema-poisoning canary — should not be here"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/spyfu--1e23a462/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from spyfu.mpp.tempo.xyz](https://www.zero.xyz/host/spyfu.mpp.tempo.xyz/llms.txt)