InputPOST /api/v1/x402/live-probe
{
"url": "https://api.example-x402.test/pay"
}Web and API intelligence · x402-trust
x402 Live Probe
Verify any third-party x402 endpoint is alive and correctly configured before paying it: a bounded GET/402 preflight fetches the payment contract, checks reachability and response latency, validates accepts, network, price and expiry against the x402 spec, and returns a signed observation receipt with an observed_at timestamp you can cite — protection against ghost endpoints, dead quotes and wasted USDC. Limitation: no payment is made, one endpoint per call, and a passing probe proves the contract at observation time — not future uptime or provider honesty — $0.005 USDC per paid call through x402.
One-command purchase
Run it from an agent.
No account or API key. AgentCash reads the 402 challenge, pays no more than the declared cap, retries the request and returns the result.
npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/live-probe -m POST -H 'x-delx-source: product-page' --max-amount 0.005 -b '{"url":"https://api.example-x402.test/pay"}'Delivered resultapplication/json
{
"kind": "x402_live_probe",
"url": "https://api.example-x402.test/pay",
"http_status": 402,
"latency_ms": 42,
"observed_at": "2026-08-14T19:00:00+00:00",
"paid": false,
"receipt_id": "0000000000000000000000000000000000000000000000000000000000000000"
}Machine-readable evidence