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x402 Payment Heartbeat / Validation Test
x402
x402 Payment Heartbeat / Validation Test is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Cheapest end-to-end x402 payment verification on Base USDC ($0.001), returning a payment-confirmed receipt and suggested next endpoints to call.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
A JSON object with: ok (true), paymentVerified (true), receiptId (unique receipt string for the $0.001 USDC payment), testRunId (echoed correlation ID), nextAction (suggested action string), and next_calls (array of recommended paid endpoint paths to call next).
Example use cases
Pre-flight x402 client check
“Before I start calling the paid crypto data endpoints, do a quick $0.001 x402 heartbeat call tagged testRunId 'preflight-2024' to make sure my Base USDC payment setup is actually working.”
CI/CD payment integration test
“Run the cheapest x402 validation call available with echo set to 'ci-build-447' so I can confirm the payment pipeline passes before merging this deployment.”
Discover available paid endpoints
“Fire a test ping against the x402 crypto microdata service — use testRunId 'discovery-run-1' — and tell me what next endpoints it recommends I call after payment is verified.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/test?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need the absolute cheapest ($0.001) way to verify an x402 payment client works end-to-end on Base USDC before committing to more expensive paid calls. It is the canonical integration smoke-test for the x402 protocol and doubles as a service-discovery call, returning recommended next endpoints. Prefer it over calling a real data endpoint for testing purposes, as those cost more and produce data you may not need during validation.
Side effects
- Payment not received or insufficient USDC balance — returns 402 Payment Required
- Invalid or missing x402 payment header — returns 402 with payment instructions
- testRunId or echo value exceeds maximum length (100 / 64 chars) — may return 400 Bad Request
- Network or Cloudflare Worker downtime — returns 5xx error
- Malformed query parameters — silently ignored or 400 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"t": "2026-10-28T14:00:00Z",
"ok": true,
"next": [
"/crypto/simulate",
"/crypto/ens",
"/crypto/liquidations?coin=BTC",
"/crypto/base-gas"
],
"receiptId": "rcpt_0b9f6c1e2a7d4c55",
"testRunId": "run-001",
"nextAction": "call_paid_data",
"paymentVerified": true
}
}Tags
x402
Reviews
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