# x402 SEO PAA Question Expander

> x402 SEO PAA Question Expander is a paid API for AI agents from x402-seo-api.restockalarm.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Expands a seed question into related 'People Also Ask' SEO keyword ideas using the x402 micropayment protocol

## Facts

- Endpoint: GET https://x402-seo-api.restockalarm.workers.dev/v1/paa-expand?utm_source=zero.xyz
- Price: $0.01/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-paa-question-expander-56a65a4b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BNDrGfnjYkO2ZE-c71Dvx

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-paa-question-expander-56a65a4b
```

Example prompt: Can you get me a list of related 'People Also Ask' questions for the query 'is running good for weight loss' so I can find SEO keyword ideas to target in my next article?

## When to prefer this

Choose this endpoint when you need quick, affordable PAA-style keyword expansion for a single question at $0.01 per call via x402 micropayments on Base. It is ideal for agents automating SEO research workflows at scale where cost-per-call matters. Prefer this over traditional SEO tools when you need programmable, pay-per-use access without subscriptions, or when integrating keyword research into an autonomous content planning pipeline.

## Known failure modes

- Missing required 'question' query parameter returns an error
- Invalid or unsupported language code in 'hl' may return empty or unexpected results
- Payment failure via x402 protocol prevents the request from completing
- Seed question with no related PAA data may return an empty 'related' array
- Rate limiting or worker downtime may cause timeouts or 503 errors

## How this service works

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

## Output

A JSON object containing the original question and an array of related 'People Also Ask' style questions that people commonly search for in relation to the seed query, useful for SEO keyword discovery and content planning.

## 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": [
      "question"
     ],
     "properties": {
      "hl": {
       "type": "string"
      },
      "question": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "related": [
   "How does running work?"
  ],
  "question": "is running good"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-seo-paa-question-expander-56a65a4b/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)