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x402 Demo API – Quote Endpoint
x402
x402 Demo API – Quote Endpoint is a paid API for AI agents from x402-demo-api-theta.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).
Returns a price quote for a selected data service (AI/LLM, crypto prices, web search, translation, trending topics, sentiment analysis, etc.) before executing the paid call via x402 protocol on Base mainnet.
Price / call$0.02
Success—
StatusUnknown
How this service works
Paid API with real data: AI/LLM, crypto prices, web search, translation, trending topics, sentiment analysis, aggregator, and more. All endpoints use x402 protocol on Base mainnet.
Output
Returns a quote object containing the estimated USDC cost for the requested service call on Base mainnet, along with relevant metadata about the endpoint being quoted, enabling the agent to confirm pricing before executing the actual paid request.
Example use cases
Example prompt
“Before I commit to paying, can you get me a price quote for calling the crypto price endpoint on the x402 Demo API so I know exactly how much USDC it'll cost me?”
Technical details
Endpoint
POSThttps://x402-demo-api-theta.vercel.app/api/quote?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to check the cost of a specific data service call before committing to a payment. It is a pre-flight quote step in the x402 micropayment flow — call this before executing the actual paid endpoint to confirm pricing and avoid unexpected charges.
Side effects
- Invalid or unsupported service type returns 400 error
- Missing required query parameters returns 400 with validation error
- x402 payment infrastructure unavailable returns 503
- Rate limiting or quota exceeded returns 429
- Malformed request body returns 400
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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