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Inference402 Keyword Extraction
x402
Inference402 Keyword Extraction is a paid API for AI agents from inference402.worlddata402.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).
Extracts the most relevant keywords from a given text using Llama 3.1 8B, billed per-call via USDC on Base with no API key required.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call AI inference for agents: chat (Llama 3.3 70B / 3.1 8B), structured JSON, summarize, translate (incl. Egyptian Arabic), extract, classify, sentiment, keywords, rewrite, embeddings, moderation, vision and speech-to-text. USDC on Base mainnet over x402. No API key, no account.
Output
Returns a JSON object containing a 'keywords' array of the most relevant terms and phrases extracted from the input text, along with a 'model' field identifying the Llama 3.1 8B FP8 model used for inference.
Example use cases
SEO keyword tagging for blog posts
“Extract the main keywords from this blog post draft so I can tag it properly for SEO: 'Decentralized finance is reshaping how individuals access credit, savings, and investment products without relying on traditional banks.'”
Automatic topic labeling for news articles
“I have a news article here — can you pull out the key terms so I can auto-label it in my CMS? The article is: 'The Federal Reserve announced a pause in interest rate hikes, citing cooling inflation and slowing job growth in the manufacturing sector.'”
Keyword extraction for research summarization
“What are the most relevant keywords in this abstract? 'Large language models fine-tuned on domain-specific corpora demonstrate significantly improved performance on specialized tasks such as medical diagnosis, legal document review, and scientific literature synthesis.'”
Technical details
Endpoint
GEThttps://inference402.worlddata402.workers.dev/v1/keywords?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight, cost-effective keyword extraction without API key registration or monthly subscriptions — ideal for agents that process text on-demand and pay only per call via USDC on Base. Best for short-to-medium texts (under 8000 chars) where speed matters and you want a simple keywords array output rather than a full NLP pipeline.
Side effects
- Text exceeds 8000 character limit — request rejected or truncated
- Payment not received or insufficient USDC balance — 402 response with payment details
- Empty or missing 'text' parameter — likely returns an error or empty keywords array
- Model inference timeout on very complex or dense text — may return 5xx error
- Malformed GET request — 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "@cf/meta/llama-3.1-8b-instruct-fp8",
"keywords": [
"x402",
"AI agents",
"USDC",
"Base",
"Ethereum L2",
"Coinbase",
"pay per request"
]
}
}Tags
x402
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