Pay 1 USDC on Base to receive 5,000 $PAY tokens and a "Payment Moment" poster.
What it does
x402.icu is an x402-protocol endpoint on the Base network that accepts a 1 USDC payment and returns 5,000 $PAY tokens along with a generated "Payment Moment" poster. The endpoint uses the x402 version 1 payment challenge flow: callers POST to the root URL with an X-PAYMENT header containing a valid payment proof. The accepted asset is USDC (contract 0x8335…2913) on Base, with an exact payment scheme requiring 1,000,000 units (1 USDC, 6 decimals). The response MIME type is application/json.
Beyond the x402 challenge itself, very little documentation is available. The site's landing page shows only a "Connect wallet" prompt, and all secondary paths (/docs, /api, /pricing, /README) return 404. There is no OpenAPI spec, no robots.txt, and no agents.txt. The payment recipient address is 0x76f15a092C7ddAC99b2276E9289F061fa1244C45. The maximum timeout for payment verification is 300 seconds. Because the endpoint is live and returns a well-formed 402 challenge, it appears functional, but the lack of documentation means the exact response payload structure and the nature of the $PAY token and poster are not independently verifiable.
Capabilities
Use cases
- —Paying 1 USDC to receive 5,000 $PAY tokens on Base
- —Generating a commemorative "Payment Moment" poster via x402 protocol
- —Demonstrating x402 payment flow integration in agent or wallet applications
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Users who want to acquire $PAY tokens for 1 USDC
- —Testing x402 agent-to-endpoint payment flows
Not for
- —Users needing detailed API documentation or OpenAPI specs
- —Production systems requiring well-documented, stable APIs
- —Anyone looking for free or non-crypto endpoints
Quick start
curl -X POST https://x402.icu/ \
-H "X-PAYMENT: <your-x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear payment parameters, but there is zero documentation, no OpenAPI spec, no examples, and no information about the response schema or the $PAY token. Almost everything beyond the challenge itself must be inferred from the description string.
Warnings
- —No documentation available — /docs, /api, /pricing, /README all return 404
- —No OpenAPI or schema describing the response payload
- —The nature and value of the $PAY token is unknown and unverifiable
- —No information about the 'Payment Moment' poster format or delivery mechanism
- —Single-page site with only 'Connect wallet' visible — very sparse
Citations
- —Endpoint returns a 402 challenge with x402Version 1, accepting 1 USDC on Base via exact schemehttps://x402.icu/
- —Payment recipient is 0x76f15a092C7ddAC99b2276E9289F061fa1244C45, asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://x402.icu/
- —Description states: Pay 1 USDC → Get 5,000 $PAY → Your 'Payment Moment' Posterhttps://x402.icu/
- —All secondary documentation paths return 404https://x402.icu/docs