Send a 1 USDC tip on Base via x402 payment protocol to a specified wallet address.
What it does
This endpoint implements the x402 payment protocol to let callers send a tip ("buy a coffee") to wallet address 0x9aaa917eBD59400B9160b90dCDa33b3138Ff3aa2. It runs on the x402-poc.vercel.app proof-of-concept platform, which allows users to create 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) of the USDC token (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge version is 1, and the maximum timeout for payment settlement is 300 seconds. Upon successful payment verification, the endpoint returns an application/json response.
This is a proof-of-concept / demo deployment. There is no documentation site, no OpenAPI spec, and no pricing page beyond what the x402 challenge itself communicates. The landing page at x402-poc.vercel.app offers a simple UI to create tip links. Because this is a PoC, stability and long-term availability are not guaranteed.
Capabilities
Use cases
- —Sending a 1 USDC tip to a specific Ethereum address on Base
- —Demonstrating x402 protocol payment flows in agent or app integrations
- —Testing x402 payment challenge/response mechanics
Fit
Best for
- —Developers experimenting with the x402 payment protocol
- —Agents that need to make small crypto payments programmatically
- —Tipping or donation use cases on the Base L2 network
Not for
- —Production-grade payment processing requiring SLAs and support
- —Variable-amount or subscription-based payments
- —Non-USDC or non-Base-network transactions
Quick start
curl -X GET https://x402-poc.vercel.app/api/0x9aaa917eBD59400B9160b90dCDa33b3138Ff3aa2/coffee \
-H "X-PAYMENT: <your-x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a well-formed x402 challenge, but there is no documentation, no OpenAPI spec, no example responses, and the platform is explicitly a proof-of-concept. Almost all details are inferred from the 402 challenge alone.
Warnings
- —Proof-of-concept deployment — no stability or uptime guarantees
- —No documentation, OpenAPI spec, or usage examples available
- —No information on what the successful response body contains
- —Wallet address is hardcoded in the URL; unclear if the endpoint is maintained long-term
Citations
- —The endpoint returns a 402 challenge with x402Version 1, exact scheme, Base network, maxAmountRequired 1000000, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC)https://x402-poc.vercel.app/api/0x9aaa917eBD59400B9160b90dCDa33b3138Ff3aa2/coffee
- —The landing page describes the app as 'Create your x402 tip link'https://x402-poc.vercel.app
- —No docs, pricing, or README pages exist (all return 404)https://x402-poc.vercel.app/docs