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Crypto Microdata for Agents (x402) — /pay Gateway
x402
Crypto Microdata for Agents (x402) — /pay Gateway 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).
Pay-per-call gateway endpoint that accepts x402 micropayments (USDC on Base) and returns routing metadata and receipt for subsequent crypto data calls
Price / call$0.001
Success—
StatusUnknown
How this service works
Paid heartbeat / x402 payment test: cheapest way to verify your x402 client end-to-end on Base USDC ($0.001). Pass testRunId= (or echo=) to correlate a validation run. Returns {ok, paymentVerified:true, receiptId, testRunId, nextAction, next_calls}. Aliases: /test, /pay, /x402/test, /crypto/test, /v1/ping.
Output
Returns a JSON object with: timestamp (t), ok status, paymentVerified boolean, receiptId for the micropayment, echoed testRunId, nextAction string ('call_paid_data'), and an array of suggested next endpoint paths (e.g. /crypto/base-gas, /crypto/liquidations).
Example use cases
Validate payment before trading data fetch
“I need to verify my USDC micropayment went through on Base before my agent pulls live Hyperliquid funding rates — can you hit the x402 pay gateway with test run ID 'hyperliq-run-42' and confirm the receipt?”
Agent self-check for onchain payment flow
“Before my trading bot starts its session, have it pay the x402 gateway with correlation tag 'bot-session-001' and confirm paymentVerified is true, then tell me which crypto data endpoints it should call next.”
Integration test of x402 micropayment pipeline
“Run a test call against the x402 pay endpoint with echo string 'smoke-test-1' and testRunId 'ci-run-007' so I can confirm the payment pipeline is working end-to-end before deploying my onchain agent.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/pay?utm_source=zero.xyzWhen to prefer
Use this endpoint as the mandatory first step when integrating with the x402 crypto microdata suite — it handles payment verification and returns routing metadata so your agent knows which data endpoints to call next. Prefer it over API-key-based crypto data services when you want keyless, pay-per-call access with USDC on Base, or when building onchain agents that need to self-fund their own data access programmatically.
Side effects
- Payment not received or insufficient USDC balance — returns 402 Payment Required with payment instructions
- Invalid x402 payment header format — returns 400 Bad Request
- echo or testRunId exceeds max length (64 or 100 chars) — schema validation error
- Network or Cloudflare Worker timeout — returns 5xx with no receipt
- Payment double-spend or replay detected — payment rejected
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
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