# x402 SEO Keyword Questions API

> x402 SEO Keyword Questions API is a paid API for AI agents from x402-seo-api.restockalarm.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-20).

Returns question-style keyword ideas (how, what, why, etc.) for a given seed keyword, useful for SEO content planning

## Facts

- Endpoint: GET https://x402-seo-api.restockalarm.workers.dev/v1/questions?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-seo-keyword-questions-api-7fe2ca99
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aoO94XEbx6cyh8FyKKPX6

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 x402-seo-keyword-questions-api-7fe2ca99
```

Example prompt: What questions are people searching for around the keyword 'running shoes'? I need SEO content ideas to build out a FAQ section.

## When to prefer this

Choose this endpoint when you need question-style keyword ideas (how, what, why, which) from a seed keyword for SEO or content planning purposes. It is especially useful for building FAQ sections, structuring content around search intent, or discovering long-tail question queries. Prefer this over general keyword volume tools when the goal is content ideation rather than search volume data.

## Known failure modes

- Missing required 'keyword' query parameter returns an error
- Keyword exceeding 100 characters may be rejected
- Payment not sent or insufficient USDC results in 402 Payment Required response
- Invalid or unsupported language code in 'hl' parameter may return empty or unexpected results
- No questions found for very obscure or niche keywords returns count: 0 with empty array

## How this service works

Pay $0.01-0.02 USDC per call on Base via x402

## Output

A JSON object containing the seed keyword, a count of results, and an array of question objects each with a rank, question type (e.g. 'how', 'what', 'why'), and the full question text. Example: {count: 1, keyword: 'running shoes', questions: [{rank: 0, type: 'how', question: 'how to clean running shoes'}]}.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "keyword"
     ],
     "properties": {
      "hl": {
       "type": "string"
      },
      "keyword": {
       "type": "string",
       "description": "Seed keyword (max 100 chars)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 1,
  "keyword": "running shoes",
  "questions": [
   {
    "rank": 0,
    "type": "how",
    "question": "how to clean running shoes"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-seo-keyword-questions-api-7fe2ca99/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-seo-api.restockalarm.workers.dev](https://www.zero.xyz/host/x402-seo-api.restockalarm.workers.dev/llms.txt)