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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-kaya.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Returns a paid quote response via the x402 micropayment protocol on Base mainnet, demonstrating pay-per-call API access at $0.01 USDC per request.
Price / call$0.01
Success—
StatusUnknown
How this service works
Paid API demo using x402 protocol on Base mainnet.
Output
The agent receives a quote response payload demonstrating the x402 paid API pattern, along with payment confirmation metadata from the Base mainnet USDC transaction. The exact response schema is not documented, but it serves as a proof-of-concept for x402 micropayment-gated API access.
Example use cases
Example prompt
“Call the x402 Demo API quote endpoint — it costs $0.01 USDC per call on Base mainnet — and show me what a successful x402 pay-per-call response looks like.”
Technical details
Endpoint
POSThttps://x402-demo-api-kaya.vercel.app/api/quote?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you want to demonstrate, test, or integrate the x402 micropayment protocol for pay-per-call API access on Base mainnet. It is ideal for developers exploring how to gate API responses behind USDC micropayments at low cost ($0.01 per call). Not suitable for production use cases requiring well-documented schemas or high reliability guarantees.
Side effects
- Payment not included or malformed x402 header → 402 Payment Required response
- Insufficient USDC balance on Base mainnet → payment failure
- Invalid or missing request body → 400 Bad Request
- Network or Vercel deployment downtime → 503 or timeout
- Wrong network (not Base mainnet) → payment rejected
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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