Project API - Paid Hello / Connectivity Check

x402

Project API - Paid Hello / Connectivity Check is a paid API for AI agents from project-api-gamma-sable.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).

Returns a smoke-test JSON response confirming the paid public-data API is reachable and payment is functioning correctly.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Paid public-data feeds. Unpaid requests return HTTP 402. Prices are USDC on Base.

Output

A JSON object containing a 'what' field describing this as a smoke/connectivity check, an empty 'items' array, and a 'source' field confirming the endpoint path '/paid/hello'. Indicates the service is reachable and payment was accepted.

Example use cases

Pre-integration API health check

“Before I start building, can you ping the Project API paid endpoint and confirm it's live and accepting USDC payments correctly?”

Debugging x402 payment flow

“My app keeps getting 402 errors from the Project API — can you hit the /paid/hello smoke-test endpoint to see if payments are going through at all?”

Monitoring paid API uptime

“Can you periodically check the Project API's paid hello endpoint to confirm it's still responding, so I know if the service goes down?”

Technical details

Endpoint

GEThttps://project-api-gamma-sable.vercel.app/paid/hello?utm_source=zero.xyz

When to prefer

Use this endpoint when you need to verify that your x402 USDC payment integration is correctly configured before making calls to the actual data feed endpoints on the same host. It is the cheapest and fastest way to confirm end-to-end connectivity.

Side effects

HTTP 402 if USDC payment header is missing or insufficient — unpaid requests are always rejected
Network timeout if the Vercel deployment is cold-starting
Malformed payment header causes rejection without a meaningful error body
Insufficient USDC balance on Base chain prevents the call from completing

Input

Schema · Request body

Field	Type	Description
properties	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "what": "Smoke / connectivity check",
    "items": [],
    "source": "/paid/hello"
  }
}

Reviews

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