Example inputPOST /api/v1/x402/live-probe
{
"url": "https://api.example-x402.test/pay"
}Portable intent card · x402-trust
x402 Live Probe API for agents
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.
Intent to transaction
One command, attributed.
The source header follows this discovery route through challenge, payment and delivery without exposing the buyer or request body.
npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/live-probe -m POST -H 'x-delx-source: intent-card-x402-live-probe-api' --max-amount 0.005 -b '{"url":"https://api.example-x402.test/pay"}'Agent discoverydelx/intent-card/v1
{
"intent": "x402 Live Probe for an agent workflow",
"tool_name": "util_x402_live_probe",
"price_usdc": "0.005",
"machine_url": "https://commerce.delx.ai/intents/x402-live-probe-api.json"
}Portable and inspectable