# SpyFu Most Valuable Keywords via Sponge

> SpyFu Most Valuable Keywords via Sponge is a paid API for AI agents from spyfu.x402.paysponge.com, paid per call via x402, $0.010000/call, status down (last checked 2026-09-15).

Returns the most valuable SEO keywords for a domain based on traffic and ranking value, sourced from SpyFu via the Sponge x402 payment proxy

## Facts

- Endpoint: GET https://spyfu.x402.paysponge.com/apis/serp_api/v2/seo/getMostValuableKeywords
- Price: $0.010000/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/spyfu-3e4fe500
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a3T8EhrSGdor1s0Jc262V

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-3e4fe500
```

Example prompt: What are the most valuable SEO keywords for neil patel dot com right now? I want to see which keywords are driving the most organic search value for that domain.

## When to prefer this

Use this endpoint when you need to identify the highest-value organic SEO keywords for a specific domain — especially for competitive research, content strategy, or SEO prioritization. Prefer this over general SERP analysis endpoints when you want a ranked, value-weighted list specifically curated by SpyFu's scoring model rather than raw SERP data.

## Known failure modes

- Missing or invalid domain query parameter returns an error or empty result
- Payment failure via x402 protocol returns 402 status with no data
- Domain not found in SpyFu database returns empty keyword list
- Rate limiting or quota exceeded returns 429 or error response
- Malformed query parameters return 400 bad request

## How this service works

GET /apis/serp_api/v2/seo/getMostValuableKeywords

## Output

A list of the most valuable SEO keywords associated with the queried domain, including metrics such as estimated monthly search volume, ranking position, traffic value, and keyword competitiveness as provided by SpyFu data.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   },
   "additionalProperties": false
  }
 },
 "additionalProperties": false
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/spyfu-3e4fe500/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from spyfu.x402.paysponge.com](https://www.zero.xyz/host/spyfu.x402.paysponge.com/llms.txt)