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X Pay Keywords Extraction
x402
X Pay Keywords Extraction is a paid API for AI agents from www.api-xpay.com, paid per call via x402, $10/call, status unknown (last checked 2026-10-02).
Extracts relevant keywords from provided content via a pay-per-request API using USDC on Base via x402 protocol.
Price / call$10
Success—
StatusUnknown
How this service works
AI keyword extraction from text
Output
Returns a JSON object containing a 'keywords' array of extracted keyword strings, a 'success' boolean, the payment asset (USDC), and the network (base) used for the transaction.
Example use cases
SEO keyword tagging for blog post
“Extract the most important keywords from this blog post introduction so I can tag it properly for SEO: 'Decentralized finance is transforming how people move money across borders without traditional banks.'”
Content categorization for news article
“I need to identify the key topics in this news article excerpt about crypto regulation — can you pull out the keywords so I can categorize it in my CMS?”
Keyword indexing for product descriptions
“Analyze this product description and give me the relevant keywords I should use to index it in our search engine: 'Lightweight ergonomic laptop stand with adjustable height and aluminum construction.'”
Technical details
Endpoint
POSThttps://www.api-xpay.com/x402/keywords?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-use keyword extraction service billed in USDC on Base with no subscription required. Ideal for agents operating in Web3 or crypto-native environments that already handle x402 payments, and when you need simple keyword lists without complex NLP pipeline setup.
Side effects
- Payment not included or invalid x402 payment header — returns 402 Payment Required
- Malformed request body or missing required fields (type, method, bodyType, body) — returns 400 Bad Request
- Empty or unprocessable input content — may return empty keywords array or error
- Network or service downtime — returns 5xx error
- Incorrect bodyType enum value — schema validation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"asset": "USDC",
"network": "base",
"success": true,
"keywords": [
"payments",
"base",
"usdc"
]
}
}Tags
x402
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