Send a 1 USDC tip (coffee) to an Ethereum address via x402 on Base.
What it does
This x402 endpoint lets anyone send a micro-tip — framed as "buying a coffee" — to the Ethereum address 0x80ACb85a6a7bE84036575960A52598f954416959. It is hosted on the x402-poc.vercel.app proof-of-concept platform, which provides a simple interface for creating x402-based tip links.
The endpoint accepts a GET request with an X-PAYMENT header containing a valid x402 payment proof. The payment scheme is "exact" on the Base network, requiring up to 1,000,000 units (1 USDC, given 6 decimals) paid in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The response MIME type is application/json. The x402 challenge version is 1, and the maximum timeout for payment settlement is 300 seconds.
This is a minimal proof-of-concept tipping endpoint. There is no OpenAPI spec, no dedicated documentation, and no additional features beyond the single payment-gated GET route. The landing page at the origin simply offers a form to create new tip links. It is best suited for demonstrating x402 payment flows or for agents that need to programmatically send small USDC tips on Base.
Capabilities
Use cases
- —Programmatically tipping a specific Ethereum address 1 USDC on Base
- —Demonstrating x402 payment protocol flows in agent or app integrations
- —Sending a small crypto gratuity without a traditional payment UI
Fit
Best for
- —Developers experimenting with the x402 payment protocol
- —AI agents that need to execute micro-payments on Base
- —Quick USDC tipping to a known wallet address
Not for
- —Variable-amount or subscription payments (fixed 1 USDC only)
- —Users who need fiat payment options or non-USDC tokens
- —Production tipping at scale — this is a proof-of-concept deployment
Quick start
curl -X GET \
-H "X-PAYMENT: <x402-payment-proof>" \
https://x402-poc.vercel.app/api/0x80ACb85a6a7bE84036575960A52598f954416959/coffeeEndpoint
Quality
The endpoint is live and returns a well-formed x402 challenge with clear payment parameters. However, there is no OpenAPI spec, no documentation, no example responses, and the crawl yields only a minimal landing page. Most fields are inferred from the challenge payload alone.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all return 404.
- —No OpenAPI or schema beyond the x402 challenge outputSchema stub.
- —This appears to be a proof-of-concept deployment; reliability and longevity are unknown.
- —No example response body is available; the actual JSON returned after payment is undocumented.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, scheme 'exact', network 'base', maxAmountRequired 1000000, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC), and payTo 0x80ACb85a6a7bE84036575960A52598f954416959.https://x402-poc.vercel.app/api/0x80ACb85a6a7bE84036575960A52598f954416959/coffee
- —The landing page at x402-poc.vercel.app offers a 'Create your x402 tip link' interface.https://x402-poc.vercel.app
- —The /docs, /pricing, /api, and /README paths all return 404.https://x402-poc.vercel.app/docs