# Long-tail Keyword Suggestions

> Long-tail Keyword Suggestions is a paid API for AI agents from seo.openverbs.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-11).

Returns up to 100 long-tail keyword suggestions that contain a given seed phrase, with optional language and location targeting.

## Facts

- Endpoint: POST https://seo.openverbs.com/v1/keyword-suggestions?utm_source=zero.xyz
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/long-tail-keyword-suggestions-a7a07e05
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wr3HJ565xJPiu8-YW_f9q

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 long-tail-keyword-suggestions-a7a07e05 -d '<json body>'
```

Example prompt: Can you give me 50 long-tail keyword suggestions based on the seed phrase 'content marketing strategy' in English for the US market?

## When to prefer this

Choose this endpoint when you need to expand a specific seed phrase into long-tail variations rather than broad topic ideation. It's ideal for content marketers, SEO specialists, and PPC managers who already have a target phrase and want to discover longer, more specific keyword variants. Prefer this over general keyword ideas endpoints when you need suggestions that strictly contain the seed phrase.

## Known failure modes

- Invalid or unsupported language code returns a validation error
- Unknown or invalid DataForSEO location code returns an error or empty results
- Seed keyword exceeding 80 characters is rejected
- Limit value outside 1–100 range is rejected
- No suggestions found for highly obscure or misspelled seed phrases
- Payment failure (x402) if USDC balance is insufficient

## How this service works

Keyword suggestions API - find long-tail keywords that contain your seed phrase (full-text phrase match), each with Google monthly search volume, CPC, competition, keyword difficulty and search intent. Complements keyword-ideas (semantically related terms) with literal phrase-match variations. For long-tail content and PPC research. No matches returns empty results.

## Output

An array of long-tail keyword strings (up to the requested limit) that each contain the provided seed phrase, tailored to the specified language and geographic market. Useful for content planning, PPC keyword lists, and SEO gap analysis.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer",
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum suggestions to return. Defaults to 20."
  },
  "keyword": {
   "type": "string",
   "maxLength": 80,
   "minLength": 1,
   "description": "Seed phrase; suggestions contain this phrase."
  },
  "languageCode": {
   "type": "string",
   "pattern": "^[A-Za-z]{2}$",
   "description": "Language code (2-letter). Defaults to en."
  },
  "locationCode": {
   "type": "integer",
   "description": "DataForSEO location code. Defaults to 2840 (United States)."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/long-tail-keyword-suggestions-a7a07e05/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from seo.openverbs.com](https://www.zero.xyz/host/seo.openverbs.com/llms.txt)